Quiz app

PHOTO

Fri Nov 15 2024 16:29:17 GMT+0000 (Coordinated Universal Time)

ActivityMain.kt: 
package com.example.quizapp 
 
import androidx.appcompat.app.AppCompatActivity 
import android.os.Bundle 
 
class MainActivity : AppCompatActivity() { 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        setContentView(R.layout.activity_main) 
 
    } 
    companion object{ 
        var count:Int=0 
    } 
} 
main_activity: 
<?xml version="1.0" encoding="utf-8"?> 
<androidx.constraintlayout.widget.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".MainActivity"> 
 
    <androidx.fragment.app.FragmentContainerView 
        android:id="@+id/fragmentContainerView" 
        android:name="androidx.navigation.fragment.NavHostFragment" 
        android:layout_width="409dp" 
        android:layout_height="729dp" 
        app:defaultNavHost="true" 
        app:layout_constraintBottom_toBottomOf="parent" 
        app:layout_constraintEnd_toEndOf="parent" 
        app:layout_constraintStart_toStartOf="parent" 
        app:layout_constraintTop_toTopOf="parent" 
        app:navGraph="@navigation/navgraph" /> 
</androidx.constraintlayout.widget.ConstraintLayout> 
win.kt: 
package com.example.quizapp 
 
import android.os.Bundle 
import androidx.fragment.app.Fragment 
import android.view.LayoutInflater 
import android.view.View 
import android.view.ViewGroup 
import android.widget.Button 
import android.widget.TextView 
import androidx.navigation.Navigation 
 
private const val ARG_PARAM1 = "param1" 
private const val ARG_PARAM2 = "param2" 
 
class win : Fragment() { 
    // TODO: Rename and change types of parameters 
    private var param1: String? = null 
    private var param2: String? = null 
 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        arguments?.let { 
            param1 = it.getString(ARG_PARAM1) 
            param2 = it.getString(ARG_PARAM2) 
        } 
    } 
 
    override fun onCreateView( 
        inflater: LayoutInflater, container: ViewGroup?, 
        savedInstanceState: Bundle? 
    ): View? { 
        var view:View=inflater.inflate(R.layout.fragment_win, container, false) 
        var tv:TextView=view.findViewById(R.id.textView) 
        var btn:Button=view.findViewById(R.id.next) 
        if(MainActivity.count==4) 
            tv.text="Congratulations you won the quiz \n score : "+MainActivity.count 
        else 
            tv.text="" 
        btn.setOnClickListener{ 
            tv.text="" 
            MainActivity.count=0 
            Navigation.findNavController(view).navigate(R.id.action_win2_to_quest1) 
        } 
        return view 
    } 
 
    companion object { 
                @JvmStatic 
        fun newInstance(param1: String, param2: String) = 
            win().apply { 
                arguments = Bundle().apply { 
                    putString(ARG_PARAM1, param1) 
                    putString(ARG_PARAM2, param2) 
                } 
            } 
    } 
} 
fragment_win.xml: 
<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".win"> 
 
    <androidx.constraintlayout.widget.ConstraintLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
 
        <Button 
            android:id="@+id/next" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Start quiz" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.314" /> 
 
        <TextView 
            android:id="@+id/textView" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.498" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.593" /> 
 
    </androidx.constraintlayout.widget.ConstraintLayout> 
 
</FrameLayout> 
lose.kt: 
package com.example.quizapp 
 
import android.os.Bundle 
import androidx.fragment.app.Fragment 
import android.view.LayoutInflater 
import android.view.View 
import android.view.ViewGroup 
import android.widget.Button 
import androidx.navigation.Navigation 
 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private const val ARG_PARAM1 = "param1" 
private const val ARG_PARAM2 = "param2" 
 
class lose : Fragment() { 
    // TODO: Rename and change types of parameters 
    private var param1: String? = null 
    private var param2: String? = null 
 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        arguments?.let { 
            param1 = it.getString(ARG_PARAM1) 
            param2 = it.getString(ARG_PARAM2) 
        } 
    } 
 
    override fun onCreateView( 
        inflater: LayoutInflater, container: ViewGroup?, 
        savedInstanceState: Bundle? 
    ): View? { 
 
        var view:View= inflater.inflate(R.layout.fragment_lose, container, false) 
        var btn:Button=view.findViewById(R.id.next) 
        btn.setOnClickListener { 
            Navigation.findNavController(view).navigate(R.id.action_lose_to_win2) 
 
        } 
        return view 
    } 
 
    companion object { 
        @JvmStatic 
        fun newInstance(param1: String, param2: String) = 
            lose().apply { 
                arguments = Bundle().apply { 
                    putString(ARG_PARAM1, param1) 
                    putString(ARG_PARAM2, param2) 
                } 
            } 
    } 
} 
fragment_lose.xml: 
<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".lose"> 
 
    <androidx.constraintlayout.widget.ConstraintLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
 
        <Button 
            android:id="@+id/next" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Try again" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.498" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/textView" 
            app:layout_constraintVertical_bias="0.5" /> 
 
        <TextView 
            android:id="@+id/textView" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Sorry you lost the quiz" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.357" /> 
 
    </androidx.constraintlayout.widget.ConstraintLayout> 
</FrameLayout> 
quest1.kt: 
package com.example.quizapp 
 
import android.os.Bundle 
import android.provider.MediaStore.Audio.Radio 
import androidx.fragment.app.Fragment 
import android.view.LayoutInflater 
import android.view.View 
import android.view.ViewGroup 
import android.widget.Button 
import android.widget.RadioGroup 
import androidx.lifecycle.findViewTreeViewModelStoreOwner 
import androidx.navigation.Navigation 
 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private const val ARG_PARAM1 = "param1" 
private const val ARG_PARAM2 = "param2" 
 
class quest1 : Fragment() { 
    // TODO: Rename and change types of parameters 
    private var param1: String? = null 
    private var param2: String? = null 
 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        arguments?.let { 
            param1 = it.getString(ARG_PARAM1) 
            param2 = it.getString(ARG_PARAM2) 
        } 
    } 
 
    override fun onCreateView( 
        inflater: LayoutInflater, container: ViewGroup?, 
        savedInstanceState: Bundle? 
    ): View? { 
        var view:View= inflater.inflate(R.layout.fragment_quest1, container, false) 
        var btn:Button=view.findViewById(R.id.next) 
        var rg:RadioGroup=view.findViewById(R.id.radioGroup) 
        btn.setOnClickListener{ 
            if(rg.checkedRadioButtonId==R.id.radio1) 
                MainActivity.count++ 
            Navigation.findNavController(view).navigate(R.id.action_quest1_to_quest2) 
        } 
        return view 
    } 
 
    companion object { 
        @JvmStatic 
        fun newInstance(param1: String, param2: String) = 
            quest1().apply { 
                arguments = Bundle().apply { 
                    putString(ARG_PARAM1, param1) 
                    putString(ARG_PARAM2, param2) 
                } 
            } 
    } 
} 
fragment_quest1.xml: 
<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".quest1"> 
 
    <androidx.constraintlayout.widget.ConstraintLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
 
        <TextView 
            android:id="@+id/textView" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="welcome to quiz" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.059" /> 
 
        <TextView 
            android:id="@+id/quest" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Quest1 : who is chiranjeevi" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.18" /> 
 
        <RadioGroup 
            android:id="@+id/radioGroup" 
            android:layout_width="180dp" 
            android:layout_height="wrap_content" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.168" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/quest" 
            app:layout_constraintVertical_bias="0.114"> 
 
            <RadioButton 
                android:id="@+id/radio1" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="actor" /> 
 
            <RadioButton 
                android:id="@+id/radio2" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="cricketer" /> 
 
            <RadioButton 
                android:id="@+id/radio3" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="comedian" /> 
 
            <RadioButton 
                android:id="@+id/radio4" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="Prime minister" 
                app:layout_constraintBottom_toBottomOf="parent" 
                app:layout_constraintTop_toTopOf="parent" /> 
        </RadioGroup> 
 
        <Button 
            android:id="@+id/next" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="next" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.498" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/radioGroup" 
            app:layout_constraintVertical_bias="0.361" /> 
    </androidx.constraintlayout.widget.ConstraintLayout> 
</FrameLayout> 
quest2.kt: 
package com.example.quizapp 
 
import android.os.Bundle 
import androidx.fragment.app.Fragment 
import android.view.LayoutInflater 
import android.view.View 
import android.view.ViewGroup 
import android.widget.Button 
import android.widget.RadioGroup 
import androidx.navigation.Navigation 
 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private const val ARG_PARAM1 = "param1" 
private const val ARG_PARAM2 = "param2" 
 
/** 
 * A simple [Fragment] subclass. 
 * Use the [quest2.newInstance] factory method to 
 * create an instance of this fragment. 
 */ 
class quest2 : Fragment() { 
    // TODO: Rename and change types of parameters 
    private var param1: String? = null 
    private var param2: String? = null 
 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        arguments?.let { 
            param1 = it.getString(ARG_PARAM1) 
            param2 = it.getString(ARG_PARAM2) 
        } 
    } 
 
    override fun onCreateView( 
        inflater: LayoutInflater, container: ViewGroup?, 
        savedInstanceState: Bundle? 
    ): View? { 
        // Inflate the layout for this fragment 
        var view:View=inflater.inflate(R.layout.fragment_quest2, container, false) 
        var btn: Button =view.findViewById(R.id.next) 
        var rg: RadioGroup =view.findViewById(R.id.radioGroup) 
        btn.setOnClickListener{ 
            if(rg.checkedRadioButtonId==R.id.radio2) 
                MainActivity.count++ 
            Navigation.findNavController(view).navigate(R.id.action_quest2_to_quest3) 
        } 
        return view 
    } 
 
    companion object { 
        /** 
         * Use this factory method to create a new instance of 
         * this fragment using the provided parameters. 
         * 
         * @param param1 Parameter 1. 
         * @param param2 Parameter 2. 
         * @return A new instance of fragment quest2. 
         */ 
        // TODO: Rename and change types and number of parameters 
        @JvmStatic 
        fun newInstance(param1: String, param2: String) = 
            quest2().apply { 
                arguments = Bundle().apply { 
                    putString(ARG_PARAM1, param1) 
                    putString(ARG_PARAM2, param2) 
                } 
            } 
    } 
} 
fragment_quest2.xml: 
<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".quest2"> 
 
    <androidx.constraintlayout.widget.ConstraintLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
 
        <TextView 
            android:id="@+id/quest" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Quest2 : who is virat Kohli" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.18" /> 
 
        <RadioGroup 
            android:id="@+id/radioGroup" 
            android:layout_width="180dp" 
            android:layout_height="wrap_content" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.168" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/quest" 
            app:layout_constraintVertical_bias="0.114"> 
 
            <RadioButton 
                android:id="@+id/radio1" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="actor" /> 
 
            <RadioButton 
                android:id="@+id/radio2" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="cricketer" /> 
 
            <RadioButton 
                android:id="@+id/radio3" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="comedian" /> 
 
            <RadioButton 
                android:id="@+id/radio4" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="Prime minister" 
                app:layout_constraintBottom_toBottomOf="parent" 
                app:layout_constraintTop_toTopOf="parent" /> 
        </RadioGroup> 
 
        <Button 
            android:id="@+id/next" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="next" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.498" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/radioGroup" 
            app:layout_constraintVertical_bias="0.361" /> 
    </androidx.constraintlayout.widget.ConstraintLayout> 
 
</FrameLayout> 
 
quest3.kt: 
package com.example.quizapp 
 
import android.os.Bundle 
import androidx.fragment.app.Fragment 
import android.view.LayoutInflater 
import android.view.View 
import android.view.ViewGroup 
import android.widget.Button 
import android.widget.RadioGroup 
import androidx.navigation.Navigation 
 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private const val ARG_PARAM1 = "param1" 
private const val ARG_PARAM2 = "param2" 
 
/** 
 * A simple [Fragment] subclass. 
 * Use the [quest3.newInstance] factory method to 
 * create an instance of this fragment. 
 */ 
class quest3 : Fragment() { 
    // TODO: Rename and change types of parameters 
    private var param1: String? = null 
    private var param2: String? = null 
 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        arguments?.let { 
            param1 = it.getString(ARG_PARAM1) 
            param2 = it.getString(ARG_PARAM2) 
        } 
    } 
 
    override fun onCreateView( 
        inflater: LayoutInflater, container: ViewGroup?, 
        savedInstanceState: Bundle? 
    ): View? { 
        // Inflate the layout for this fragment 
        var view:View= inflater.inflate(R.layout.fragment_quest3, container, false) 
        var btn: Button =view.findViewById(R.id.next) 
        var rg: RadioGroup =view.findViewById(R.id.radioGroup) 
        btn.setOnClickListener{ 
            if(rg.checkedRadioButtonId==R.id.radio3) 
                MainActivity.count++ 
            Navigation.findNavController(view).navigate(R.id.action_quest3_to_quest4) 
        } 
        return view 
    } 
 
    companion object { 
        /** 
         * Use this factory method to create a new instance of 
         * this fragment using the provided parameters. 
         * 
         * @param param1 Parameter 1. 
         * @param param2 Parameter 2. 
         * @return A new instance of fragment quest3. 
         */ 
        // TODO: Rename and change types and number of parameters 
        @JvmStatic 
        fun newInstance(param1: String, param2: String) = 
            quest3().apply { 
                arguments = Bundle().apply { 
                    putString(ARG_PARAM1, param1) 
                    putString(ARG_PARAM2, param2) 
                } 
            } 
    } 
} 
fragment_quest3.xml: 
<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".quest3"> 
 
    <androidx.constraintlayout.widget.ConstraintLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
 
 
        <TextView 
            android:id="@+id/quest" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Quest3 : who is bramhanandham" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.18" /> 
 
        <RadioGroup 
            android:id="@+id/radioGroup" 
            android:layout_width="180dp" 
            android:layout_height="wrap_content" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.168" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/quest" 
            app:layout_constraintVertical_bias="0.114"> 
 
            <RadioButton 
                android:id="@+id/radio1" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="actor" /> 
 
            <RadioButton 
                android:id="@+id/radio2" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="cricketer" /> 
 
            <RadioButton 
                android:id="@+id/radio3" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="comedian" /> 
 
            <RadioButton 
                android:id="@+id/radio4" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="Prime minister" 
                app:layout_constraintBottom_toBottomOf="parent" 
                app:layout_constraintTop_toTopOf="parent" /> 
        </RadioGroup> 
 
        <Button 
            android:id="@+id/next" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="next" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.498" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/radioGroup" 
            app:layout_constraintVertical_bias="0.361" /> 
    </androidx.constraintlayout.widget.ConstraintLayout> 
 
</FrameLayout> 
quest4.kt: 
package com.example.quizapp 
 
import android.os.Bundle 
import androidx.fragment.app.Fragment 
import android.view.LayoutInflater 
import android.view.View 
import android.view.ViewGroup 
import android.widget.Button 
import android.widget.RadioGroup 
import androidx.navigation.Navigation 
 
// TODO: Rename parameter arguments, choose names that match 
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER 
private const val ARG_PARAM1 = "param1" 
private const val ARG_PARAM2 = "param2" 
 
/** 
 * A simple [Fragment] subclass. 
 * Use the [quest4.newInstance] factory method to 
 * create an instance of this fragment. 
 */ 
class quest4 : Fragment() { 
    // TODO: Rename and change types of parameters 
    private var param1: String? = null 
    private var param2: String? = null 
 
    override fun onCreate(savedInstanceState: Bundle?) { 
        super.onCreate(savedInstanceState) 
        arguments?.let { 
            param1 = it.getString(ARG_PARAM1) 
            param2 = it.getString(ARG_PARAM2) 
        } 
    } 
 
    override fun onCreateView( 
        inflater: LayoutInflater, container: ViewGroup?, 
        savedInstanceState: Bundle? 
    ): View? { 
        // Inflate the layout for this fragment 
        var view:View= inflater.inflate(R.layout.fragment_quest4, container, false) 
        var btn: Button =view.findViewById(R.id.next) 
        var rg: RadioGroup =view.findViewById(R.id.radioGroup) 
        btn.setOnClickListener{ 
            if(rg.checkedRadioButtonId==R.id.radio4) 
                MainActivity.count++ 
            if(MainActivity.count==4) 
                Navigation.findNavController(view).navigate(R.id.action_quest4_to_win2) 
            else 
                Navigation.findNavController(view).navigate(R.id.action_quest4_to_lose) 
        } 
        return view 
    } 
 
    companion object { 
        /** 
         * Use this factory method to create a new instance of 
         * this fragment using the provided parameters. 
         * 
         * @param param1 Parameter 1. 
         * @param param2 Parameter 2. 
         * @return A new instance of fragment quest4. 
         */ 
        // TODO: Rename and change types and number of parameters 
        @JvmStatic 
        fun newInstance(param1: String, param2: String) = 
            quest4().apply { 
                arguments = Bundle().apply { 
                    putString(ARG_PARAM1, param1) 
                    putString(ARG_PARAM2, param2) 
                } 
            } 
    } 
} 
fragment_quest4.xml: 
<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".quest4"> 
 
    <androidx.constraintlayout.widget.ConstraintLayout 
        android:layout_width="match_parent" 
        android:layout_height="match_parent"> 
 
 
        <TextView 
            android:id="@+id/quest" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="Quest4 : who is narendra modi" 
            android:textColor="#000000" 
            android:textSize="28dp" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toTopOf="parent" 
            app:layout_constraintVertical_bias="0.18" /> 
 
        <RadioGroup 
            android:id="@+id/radioGroup" 
            android:layout_width="180dp" 
            android:layout_height="wrap_content" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.168" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/quest" 
            app:layout_constraintVertical_bias="0.114"> 
 
            <RadioButton 
                android:id="@+id/radio1" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="actor" /> 
 
            <RadioButton 
                android:id="@+id/radio2" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="cricketer" /> 
 
            <RadioButton 
                android:id="@+id/radio3" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="comedian" /> 
 
            <RadioButton 
                android:id="@+id/radio4" 
                android:layout_width="match_parent" 
                android:layout_height="wrap_content" 
                android:text="Prime minister" 
                app:layout_constraintBottom_toBottomOf="parent" 
                app:layout_constraintTop_toTopOf="parent" /> 
        </RadioGroup> 
 
        <Button 
            android:id="@+id/next" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:text="submit" 
            app:layout_constraintBottom_toBottomOf="parent" 
            app:layout_constraintEnd_toEndOf="parent" 
            app:layout_constraintHorizontal_bias="0.498" 
            app:layout_constraintStart_toStartOf="parent" 
            app:layout_constraintTop_toBottomOf="@+id/radioGroup" 
            app:layout_constraintVertical_bias="0.361" /> 
    </androidx.constraintlayout.widget.ConstraintLayout> 
 
</FrameLayout> 
Navgraph: 
fragment_win: 
fragment_lose: 
fragment_quest1: 
fragment_quest2: 
fragment_quest3: 
fragment_quest4: 
PROCEDURE TO FOLLOW IN NAVIGATION USING FRAGMENTS APP 
1) Create empty Activity 
2) Create layout folder and add “activity_main.xml” file in it 
3) How to create Navigation folder and navigation graph: 
i) 
Add dependencies in build.gradle file 
implementation("androidx.constraintlayout:constraintlayout-compose:1.0.0
alpha08") 
implementation("androidx.navigation:navigation-fragment-ktx:2.3.5") 
implementation("androidx.navigation:navigation-ui-ktx:2.3.5") 
implementation("androidx.navigation:navigation-dynamic-features
fragment:2.3.5") 
ii) 
iii) 
Create navigation folder and add nav_graph.xml in it 
Create “new destination” in nav_graph.xml then select 2 blank fragments and 
name it as “HomeFragment” and “DataFragment” 
4) Add the following steps in activity_main.xml: 
i) 
Add constraint layout 
ii) 
Drag and drop fragment container view and select “HomeFragment.kt” 
add:navGraph=”@navigation/nav_graph” 
5) Add the following steps in HomeFragment in xml: 
i) 
Add Constraint View 
ii) 
iii) 
Add Text View 
Add Button  
6) Add the following steps in DataFragment in xml: 
i) 
Add Constraint View 
ii) 
iii) 
Add Text View 
Add Button

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MAD-LAB

@varuntej

KOTLIN PROGRAMS Tip Calculator Activity Lifecycle Dice Roller login module Toast Copy Paste Hello World Explicit Intent implicit intent fragments Quiz app

#kotlin

How to disable Half Expanded state in ModalBottomSheet

val sheetState = rememberModalBottomSheetState(
    initialValue = ModalBottomSheetValue.Hidden,
    confirmStateChange = { it != ModalBottomSheetValue.HalfExpanded }
)

#mvvm #kotlin

Libraries for MVVM pattern

//Kotlin Kapt plugin used for annotations
id 'kotlin-kapt'

// RoomDatabase Libraries

 def roomVersion = "2.4.0"
    implementation "androidx.room:room-runtime:$roomVersion"
    kapt "androidx.room:room-compiler:$roomVersion"
    implementation "androidx.room:room-ktx:$roomVersion"

// Coroutines
   implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.3"
   implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.3"

// LiveCycle and ViewModel
 def lifecycle_version = "2.2.0"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"


// Retrofit

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'



// for enabling view and databinding in android tag

buildFeatures{
        dataBinding true
    }

    viewBinding {
        enabled = true
    }

#kotlin

Extension Kotlin

package utils

import android.animation.Animator
import android.animation.Animator.*
import android.animation.ObjectAnimator
import android.animation.PropertyValuesHolder
import android.animation.ValueAnimator
import android.annotation.SuppressLint
import android.app.Activity
import android.content.Context
import android.graphics.drawable.BitmapDrawable
import android.util.Log
import android.view.View
import android.view.ViewGroup.*
import android.widget.ImageView
import android.widget.Toast
import androidx.core.view.marginTop
import androidx.fragment.app.FragmentActivity
import androidx.palette.graphics.Palette
import androidx.recyclerview.widget.DefaultItemAnimator
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import applicaton.BaseViewModel.*
import applicaton.BaseViewModel.BaseRequest.*
import br.com.icaro.filme.R
import com.github.clans.fab.FloatingActionMenu
import com.google.android.material.bottomsheet.BottomSheetBehavior
import com.google.gson.Gson
import com.squareup.picasso.Callback
import com.squareup.picasso.MemoryPolicy
import com.squareup.picasso.NetworkPolicy
import com.squareup.picasso.Picasso
import domain.reelgood.movie.Availability
import domain.tvshow.Tvshow
import error.BottomSheetError
import error.CallBackError
import java.text.DateFormat
import java.text.Normalizer
import java.text.ParseException
import java.text.SimpleDateFormat
import java.util.Calendar
import java.util.Date
import java.util.Locale

/**
 * Created by icaro on 03/09/17.
 */
/**
 * IMAGEVIEW
 */
fun ImageView.setPicasso(
	stillPath: String?,
	patten: Int = 4,
	sucesso: () -> Unit = {},
	error: () -> Unit = {},
	img_erro: Int = R.drawable.poster_empty,
): ImageView {
	Picasso.get()
		.load(
			UtilsApp
				.getBaseUrlImagem(UtilsApp.getTamanhoDaImagem(context, patten)) + stillPath
		)
		.error(img_erro)
		.memoryPolicy(MemoryPolicy.NO_STORE, MemoryPolicy.NO_CACHE)
		.networkPolicy(NetworkPolicy.NO_CACHE, NetworkPolicy.NO_STORE)
		.into(this, object : Callback {
			override fun onSuccess() {
				sucesso()
			}

			override fun onError(e: java.lang.Exception?) {
				error()
			}
		})
	return this
}

fun ImageView.setPicassoWithCache(
	stillPath: String?, patten: Int = 4,
	sucesso: () -> Unit = {},
	error: () -> Unit = {},
	img_erro: Int = R.drawable.poster_empty,
): ImageView {
	Picasso.get()
		.load(
			UtilsApp
				.getBaseUrlImagem(UtilsApp.getTamanhoDaImagem(context, patten)) + stillPath
		)
		.error(img_erro)
		.into(this, object : Callback {
			override fun onSuccess() {
				sucesso()
			}

			override fun onError(e: java.lang.Exception?) {
				error()
			}
		})
	return this
}

fun ImageView.setPicassoWithCacheAndHolder(
	stillPath: String?, patten: Int = 4,
	sucesso: () -> Unit = {},
	error: () -> Unit = {},
	img_erro: Int = R.drawable.poster_empty,
	holder: Int,
): ImageView {
	Picasso.get()
		.load(UtilsApp.getBaseUrlImagem(UtilsApp.getTamanhoDaImagem(context, patten)) + stillPath)
		.placeholder(holder)
		.error(img_erro)
		.into(this, object : Callback {
			override fun onSuccess() {
				sucesso()
			}

			override fun onError(e: java.lang.Exception?) {
				error()
			}
		})
	return this
}

fun ImageView.loadPallet(): Int? {
	val color = (drawable as? BitmapDrawable)?.run {
		Palette.Builder(this.bitmap).generate().swatches.first().rgb
	}
	return color ?: 0
}

fun loadPalette(view: ImageView): Int { // Todo Usar ext
	val imageView = view as ImageView
	val drawable = imageView.drawable as? BitmapDrawable
	if (drawable != null) {
		return Palette.Builder(drawable.bitmap).generate().swatches.last().rgb
	}
	return 0
}

/**
 * ACTIVITY
 */
fun Activity.makeToast(restText: Int, time: Int = Toast.LENGTH_SHORT) {
	this.makeToast(this.getString(restText), time)
}

fun Activity.makeToast(text: String?, time: Int = Toast.LENGTH_SHORT) {
	Toast.makeText(this, text, time).show()
}

/**
 * Context
 */
fun Context.makeToast(text: String?, time: Int = Toast.LENGTH_SHORT) {
	Toast.makeText(this, text, time).show()
}

/**
 * VIEW
 */
fun View.gone() {
	this.visibility = View.GONE
}

fun View.visible() {
	this.visibility = View.VISIBLE
}

fun View.invisible() {
	this.visibility = View.INVISIBLE
}

fun View.animeRotation(
	end: () -> Unit = {},
	cancel: () -> Unit = {},
	start: () -> Unit = {},
	repeat: () -> Unit = {},
) {
	ObjectAnimator
		.ofPropertyValuesHolder(
			this,
			PropertyValuesHolder.ofFloat(View.SCALE_X, 1.0f, 0.2f),
			PropertyValuesHolder.ofFloat(View.SCALE_Y, 1.0f, 0.2f),
			PropertyValuesHolder.ofFloat(View.SCALE_X, 0.0f, 1.0f),
			PropertyValuesHolder.ofFloat(View.SCALE_Y, 0.0f, 1.0f)
		)
		.apply {
			duration = 790
			addListener(object : AnimatorListener {
				override fun onAnimationRepeat(animation: Animator?) {
					repeat()
				}

				override fun onAnimationEnd(animation: Animator?) {
					end()
				}

				override fun onAnimationCancel(animation: Animator?) {
					cancel()
				}

				override fun onAnimationStart(animation: Animator?) {
					start()
				}
			})
		}.start()
}

/**
 * Any
 */
fun Any.putString(cxt: Context): String = when (this) {
	is String -> this
	is Int -> cxt.getString(this)
	else -> {
		require(false) { "Need R.string.id or string" }
		""
	}
}

/**
 * STRING
 */
fun String.removerAcentos(): String {
	this.replace(".", "")
	this.replace(":", "")
	this.replace("/", "")
	this.replace(";", "")
	return Normalizer.normalize(this, Normalizer.Form.NFD).replace("[^\\p{ASCII}]".toRegex(), "")
}

fun String.parseDate(): String {
	return try {
		val sim = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss")
		val data = sim.parse(this)
		DateFormat.getDateInstance(DateFormat.SHORT).format(data)
	} catch (ex: Exception) {
		"-/-"
	}
}

fun String.parseDateShot(): String {
	return try {
		val sim = SimpleDateFormat("yyyy-MM-dd")
		val data = sim.parse(this)
		DateFormat.getDateInstance(DateFormat.SHORT).format(data)
	} catch (ex: Exception) {
		"-/-"
	}
}

fun verifyLaunch(air_date: Date?): Boolean {
	if (air_date == null) return false
	val now = Calendar.getInstance().time
	return if (air_date.before(now)) {
		true
	} else !air_date.after(now)
}

fun String.getDate(format: String = "yyyy-MM-dd"): Date? {
	return try {
		let {
			val sdf = SimpleDateFormat(format, Locale.getDefault())
			sdf.parse(it)
		}
	} catch (e: ParseException) {
		e.printStackTrace()
		null
	}
}

fun String.released(): Boolean {
	val data = getDate()
	return verifyLaunch(data)
}

@Throws(Exception::class)
fun String.yearDate(): String {
	return if (this.length >= 4) this.substring(0, 4) else ""
}

fun String.periodLaunch(): Boolean {
	val oneWeekBack = Calendar.getInstance().apply { add(Calendar.DAY_OF_YEAR, -7) }.time
	return getDate() != null && getDate()!!.after(oneWeekBack) //valida data
}

fun String.getNameTypeReel(): String {
	return replace(":", "-")
		.replace(" ", "-")
		.replace("&", "and")
		.replace(".", "")
		.replace("é", "e")
		.replace("ẽ", "e")
		.replace("è", "e")
		.replace("ë", "e")
		.replace("ç", "c")
		.replace("â", "a")
		.replace("ã", "a")
		.replace("á", "a")
		.replace("à", "a")
		.replace("ä", "a")
		.replace("ä", "a")
		.replace("'", "")
		.replace("\"", "")
		.replace("´", "")
		.replace("~", "")
		.replace("^", "")
		.replace("---", "-")
		.replace("----", "-")
		.replace("--", "-")
		.toLowerCase()
}

fun String?.notNullOrEmpty() = !this.isNullOrEmpty()
fun <T> Gson.fromJsonWithLog(json: String?, classOfT: Class<T>): T {
	return this.fromJson<T>(json, classOfT).apply {
		this.toString().log(classOfT.name)
	}
}

fun String.log(tag: String = "") = Log.i(tag, this)

fun Tvshow.createIdReal() = createIdReal(this.originalName ?: "", this.firstAirDate ?: "")
private fun createIdReal(originalName: String, data: String) =
	"${originalName.getNameTypeReel()}-${data.yearDate()}"

/**
 * RECYCLER
 */
fun RecyclerView.setScrollInvisibleFloatMenu(floatButton: FloatingActionMenu) {
	addOnScrollListener(object : RecyclerView.OnScrollListener() {
		override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
			when (newState) {
				RecyclerView.SCROLL_STATE_IDLE -> floatButton.visible()
				RecyclerView.SCROLL_STATE_DRAGGING -> floatButton.invisible()
				RecyclerView.SCROLL_STATE_SETTLING -> floatButton.invisible()
			}
		}
	})
}

@SuppressLint("WrongConstant")
fun RecyclerView.patternRecyler(horizont: Boolean = true): RecyclerView {
	val typeOrient = if (horizont) LinearLayoutManager.HORIZONTAL else LinearLayoutManager.VERTICAL
	layoutManager = LinearLayoutManager(context, typeOrient, false)
	itemAnimator = DefaultItemAnimator()
	setHasFixedSize(true)
	return this
}

fun RecyclerView.patternRecyclerGrid(quant: Int = 2): RecyclerView {
	layoutManager = GridLayoutManager(context, quant)
	setHasFixedSize(true)
	itemAnimator = DefaultItemAnimator()
	return this
}

fun RecyclerView.minHeight(): RecyclerView {
	layoutParams.height = 1
	importantForAccessibility = View.IMPORTANT_FOR_ACCESSIBILITY_NO
	isFocusable = false
	return this
}

/**
 * AVAILABILITY
 */
fun Availability.getPricePurchase(): String {
	val less = purchaseCostSd?.let { purchaseCostHd?.coerceAtMost(it) }
	val biggest = purchaseCostSd?.let { purchaseCostHd?.coerceAtLeast(it) }
	if (less == biggest) return less.toString()
	return "${if (less != 0.0) less.toString() else "--"} - ${if (biggest != 0.0) biggest.toString() else "--"}"
}

fun Availability.getPriceRental(): String {
	val less = rentalCostSd?.let { rentalCostHd?.coerceAtMost(it) }
	val biggest = rentalCostSd?.let { rentalCostHd?.coerceAtLeast(it) }
	if (less == biggest) return less.toString()
	return "${if (less != 0.0) less.toString() else "--"} - ${if (biggest != 0.0) biggest.toString() else "--"}"
}

/**
 * BottomSheetBehavior
 */
fun BottomSheetBehavior<View>.setAnimation(container: View, viewHeight: View) {
	ValueAnimator.ofInt(container.measuredHeight, viewHeight.marginTop).apply {
		addUpdateListener {
			peekHeight = it.animatedValue as Int
		}
		duration = 500
	}.start()

	container.post {
		val newLayoutParams = (container.layoutParams as? MarginLayoutParams)
		newLayoutParams?.setMargins(0, 0, 0, viewHeight.marginTop + 1)
		container.layoutParams = newLayoutParams
	}
}

/**
 * MutableList
 */
fun <T> MutableList<T>.replaceItemList(item: T, predicate: (T) -> Boolean): MutableList<T> {
	return this.map {
		if (predicate(it)) item else it
	}.toMutableList()
}

fun <T> Any.listSize(item: T, size: Int): ArrayList<T> {
	return if (size <= 0) {
		arrayListOf()
	} else {
		arrayListOf<T>().apply {
			for (i in 0 until size) {
				add(item)
			}
		}
	}
}

/**
 * BaseRequest
 */
fun <T> BaseRequest<T>.success() = (this as Success<T>).result
fun <T> BaseRequest<T>.resolver(
	activity: FragmentActivity,
	successBlock: (data: T) -> Unit,
	failureBlock: (error: Exception) -> Unit = {},
	loadingBlock: (loading: Boolean) -> Unit = {},
	genericError: CallBackError? = null,
) {
	when (this) {
		is Success -> successBlock(result)
		is Loading -> loadingBlock(loading)
		is Failure -> {
			error.toString().log()
			if (genericError != null) {
				BottomSheetError().newInstance(callBackError = genericError)
					.show(activity.supportFragmentManager, "")
			} else {
				failureBlock(error)
			}
		}
	}
}

#kotlin

Adapter Delegate

package adapter

import android.content.Context
import android.view.ViewGroup
import androidx.collection.SparseArrayCompat
import androidx.recyclerview.widget.RecyclerView
import domain.ViewType
import domain.movie.ListaItemFilme
import pessoaspopulares.adapter.LoadingDelegateAdapter
import pessoaspopulares.adapter.ViewTypeDelegateAdapter
import utils.Constant

/**
 * Created by icaro on 14/08/16.
 */
class ListUserAdapter(private val context: Context) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
    private val listaResult = ArrayList<ViewType>()
    private val delegateAdapters = SparseArrayCompat<ViewTypeDelegateAdapter>()

    init {
        delegateAdapters.put(Constant.ViewTypesIds.LOADING, LoadingDelegateAdapter())
        delegateAdapters.put(Constant.ViewTypesIds.NEWS, ListasDelegateAdapter())
        listaResult.add(loading)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return delegateAdapters.get(viewType)!!.onCreateViewHolder(parent)
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        delegateAdapters.get(getItemViewType(position))?.onBindViewHolder(holder, listaResult[position], context)
    }

    override fun getItemViewType(position: Int): Int {
        return listaResult[position].getViewType()
    }

    fun addItens(listaMedia: List<ListaItemFilme?>?, totalResults: Int) {
        if (listaMedia?.isNotEmpty()!!) {
            val initPosition = listaResult.size - 1
            this.listaResult.removeAt(initPosition)
            notifyItemRemoved(initPosition)
            for (result in listaMedia) {
                this.listaResult.add(result!!)
            }
            this.listaResult.sortedBy { (it as ListaItemFilme).releaseDate }
                .reversed()
            notifyItemRangeChanged(initPosition, this.listaResult.size + 1 /* plus loading item */)
            if (listaResult.size < totalResults)
                this.listaResult.add(loading)
        }
    }

    override fun getItemCount(): Int = listaResult.size

    companion object {

        private val loading = object : ViewType {
            override fun getViewType(): Int {
                return Constant.ViewTypesIds.LOADING
            }
        }
    }
}





@Keep
interface ViewType {
    fun getViewType(): Int
}

interface ViewTypeDelegateAdapter {

    fun onCreateViewHolder(parent: ViewGroup): RecyclerView.ViewHolder

    fun onBindViewHolder(holder: RecyclerView.ViewHolder, item: ViewType?, context: Context?)
}



class LoadingDelegateAdapter : ViewTypeDelegateAdapter {

    override fun onCreateViewHolder(parent: ViewGroup) = LoadingViewHolder(parent)

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, item: ViewType?, context: Context?) {
    }

    class LoadingViewHolder(parent: ViewGroup) : RecyclerView.ViewHolder(
            LayoutInflater.from(parent.context)
                .inflate(R.layout.new_item_loading, parent, false))
}


class ListasDelegateAdapter : ViewTypeDelegateAdapter {

	override fun onCreateViewHolder(parent: ViewGroup): RecyclerView.ViewHolder =
		ListViewHolder(parent)

	override fun onBindViewHolder(
		holder: RecyclerView.ViewHolder,
		item: ViewType?,
		context: Context?
	) {
		(holder as ListViewHolder).bind(item as ListaItemFilme)
	}

	inner class ListViewHolder(parent: ViewGroup) :
		RecyclerView.ViewHolder(
			LayoutInflater.from(parent.context).inflate(R.layout.lista, parent, false)
		) {

		fun bind(item: ListaItemFilme) = with(itemView) {

			img_lista.setPicassoWithCache(item.posterPath, 3)
			when (item.mediaType) {
				"tv" -> date_oscar.text =
					if (!item.first_air_date.isNullOrEmpty() && item.first_air_date.length > 3)
						item.first_air_date.subSequence(0, 4) else "-"
				"movie" -> date_oscar.text =
					if (!item.releaseDate.isNullOrEmpty() && item.releaseDate.length > 3)
						item.releaseDate.subSequence(0, 4) else "-"
			}

			progress.visibility = View.GONE
			itemView.setOnClickListener {
				when (item.mediaType) {
					"tv" -> {
						val intent = Intent(context, TvShowActivity::class.java).apply {
							putExtra(Constant.TVSHOW_ID, item.id)
							putExtra(Constant.COLOR_TOP, UtilsApp.loadPalette(img_lista))
						}
						context.startActivity(intent)
					}
					"movie" -> {
						val intent = Intent(context, MovieDetailsActivity::class.java).apply {
							putExtra(Constant.FILME_ID, item.id)
							putExtra(Constant.COLOR_TOP, UtilsApp.loadPalette(img_lista))
						}
						context.startActivity(intent)
					}
				}
			}
		}
	}
}

#kotlin

also let apply with run. Функции в Kotlin. | javaway.info

listOf(0,1,2,null,4,null,6,7).forEach{
     it?.let{
         println(it)
     } ?: println("null detected")
 }

#kotlin #springframework

Ping Controller actions

@RequestMapping(produces = [MediaType.TEXT_HTML_VALUE, CustomMediaType.TURBO_STREAM_VALUE])
suspend fun pinger(model: Model): String {
    model.addAttribute("pingTime", pingService.ping(hostname, port))
    return "ping.turbo-stream"
}

#kotlin #android

Android: ViewBinding in Fragment

// MyFragment.kt

class MyFragment : Fragment(R.layout.fragment_my) {
  
  private var _binding: MyFragmentBinding? = null
  private val binding get() = _binding!!

  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    
    _binding = MyFragmentBinding.bind(view)
    
    binding.someview.text = "bla bla"
  }

  override fun onDestroyView() {
    super.onDestroyView()
    _binding = null
  }
}

#kotlin #android

ViewModelFactory boilerplate code

class SleepTrackerViewModelFactory(
       private val dataSource: SleepDatabaseDao,
       private val application: Application) : ViewModelProvider.Factory {
   @Suppress("unchecked_cast")
   override fun <T : ViewModel?> create(modelClass: Class<T>): T {
       if (modelClass.isAssignableFrom(SleepTrackerViewModel::class.java)) {
           return SleepTrackerViewModel(dataSource, application) as T
       }
       throw IllegalArgumentException("Unknown ViewModel class")
   }
}

#kotlin

ConstraintLayout

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.constraintlayout.widget.Group
	android:id="@+id/group"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="text,button"/>

    <com.google.android.material.textview.MaterialTextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android Text"
        app:layout_constraintTop_toTopOf="parent"/>

    <com.google.android.material.button.MaterialButton
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android"
        app:layout_constraintTop_toBottomOf="@id/text"/>
    
</androidx.constraintlayout.widget.ConstraintLayout>

#kotlin

Swap variables with one line

var a = 1;
var b = 2;
    
a = b.also { b = a } // now a = 2, b = 1

#kotlin #android

Key listener

userInput.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->

	if (keyCode == KeyEvent.KEYCODE_ENTER && event.action == KeyEvent.ACTION_UP) {

		//code
		return@OnKeyListener true

	}

	false

})

#kotlin #android

List adapter

// Create an array and instantiate a listview
val myArray : MutableList<BigInteger> = mutableListOf(); val lstView = findViewById<ListView>(R.id.lsvw)

// Create an adapter and link it to the listview
val arrayAdapter : ArrayAdapter<BigInteger> = ArrayAdapter<BigInteger(this, android.R.layout.simple_list_item_1, myArray)
lstView.adapter = arrayAdapter

// Add data to the array and push it to the adapter
myArray.add(<data>)
arrayAdapter.notifyDataSetChanged()

#kotlin #android

Standard activity

<?xml version="1.0" encoding="utf-8"?>

  <ScrollView

        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:fillViewport="true"
  >

    <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/constraint_layout1"
            >


        <com.google.android.material.textfield.TextInputLayout

                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintBottom_toTopOf="@+id/username_input_layout"
                android:padding="16dp"
                app:helperText="Email"
                android:id="@+id/email_input_layout"
                app:layout_constraintVertical_chainStyle="packed"
                app:layout_constraintVertical_bias=".1"

        >

            <TextView

                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:id="@+id/email"
                    android:textColor="#000"
                    android:hint="@string/your_email"
                    android:textSize="20sp"
            />

        </com.google.android.material.textfield.TextInputLayout>


        <com.google.android.material.textfield.TextInputLayout

                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toBottomOf="@+id/email_input_layout"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintBottom_toTopOf="@+id/change_password"
                android:padding="16dp"
                app:helperText="Username"
                android:id="@+id/username_input_layout"

        >

            <TextView

                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:id="@+id/username"
                    android:textColor="#000"
                    android:hint="@string/your_username"
                    android:textSize="20sp"

            />

        </com.google.android.material.textfield.TextInputLayout>


        <TextView

                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toBottomOf="@+id/username_input_layout"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                android:textSize="18sp"
                android:textColor="@color/link_blue"
                android:text="@string/change_password"
                android:id="@+id/change_password"
                android:gravity="center"

        />

        <Button

                android:id="@+id/logout_button"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:layout_constraintTop_toBottomOf="@+id/change_password"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                android:background="@drawable/red_button_drawable"
                android:text="Log out"
                android:textAllCaps="false"
                android:textColor="#fff"
                android:textSize="16sp"
                android:layout_marginLeft="15dp"
                android:layout_marginRight="15dp"
                android:layout_marginTop="50dp"
                android:layout_marginBottom="30dp"

        />
                  
    </androidx.constraintlayout.widget.ConstraintLayout>


</ScrollView>

#kotlin #extensionfunction #enum

Kotlin Enum with extension function

enum class PaymentOption {
    CASH,
    CARD,
    TRANSFER
}

fun PaymentOption.startPayment(transaction: TransactionData) {
    when (this) {
        PaymentOption.CASH -> showCashPaimentInfo(transaction)
        PaymentOption.CARD -> moveToCardPaymentPage(transaction)
        PaymentOption.TRANSFER -> {
            showMoneyTransferInfo()
            setupPaymentWatcher(transaction)
        }
    }
}

#by #kotlin #jetpackcompose

use by in jetpack compose

import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue

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