Example of TextView

In XML :

<TextView
        android:id="@+id/text_view_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:textColor="#86AD33"
        android:textSize="20dp"
        android:textStyle="bold"
        android:textAllCaps="true"
        android:background="#7F3AB5"/>
   
IN JAVA : 

 TextView textView = (TextView) findViewById(R.id.text_view_id);
        textView.setText("Hello CO6I "); //set text for text view
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In XML :
<EditText
    android:id="@+id/simpleEditText"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:text="Username"/><!--set text in edit text-->
IN JAVA : 
package com.example.empty_activity_app;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText)findViewById(R.id.simpleEditText);
        editText.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) 
    {
        // TODO Auto-generated method stub
        editText.setText("Username");
    }
}
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In XML :
<Button
        android:id="@+id/backbutton"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="Back" />
IN JAVA : 
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button)findViewById(R.id.backbutton);
        button.setOnClickListener(this);
    }
    @Override
    public void onClick(View v)
    {
        // TODO Auto-generated method stub
        button.setBackgroundColor(Color.RED);
    }
}
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In XML :
<ImageButton
        android:id="@+id/simpleImageButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_delete"/>
IN JAVA : 
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    ImageButton button;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (ImageButton)findViewById(R.id.simpleImageButton);
        button.setOnClickListener(this);
    }
    @Override
    public void onClick(View v)
    {
        // TODO Auto-generated method stub
        button.setBackgroundColor(Color.WHITE);
    }
}
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 <ToggleButton
        android:id="@+id/simpleToggleButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:textOff="OFF"
        android:textOn="ON"
        android:checked="true" />

package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.ToggleButton;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    ToggleButton button;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (ToggleButton)findViewById(R.id.simpleToggleButton1);
        button.setOnClickListener(this);
    }
    @Override
    public void onClick(View v)
    {
        
    }
}
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IN XML :
<RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center">
        <RadioButton
            android:id="@+id/simpleRadioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Python"
            android:checked="false"
            android:textColor="#f00"
            android:textSize="35dp"/>
        <RadioButton
            android:id="@+id/simpleRadioButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Java"
            android:checked="true"
            android:textColor="#f00"
            android:textSize="35dp"/>
    </RadioGroup>

IN JAVA :
package com.example.empty_activity_app;

import androidx.appcompat.app.AppCompatActivity;

import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    RadioButton button1,button2;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1 = (RadioButton)findViewById(R.id.simpleRadioButton1);
        button1.setOnClickListener(this);
        button2 = (RadioButton)findViewById(R.id.simpleRadioButton2);
        button2.setOnClickListener(this);
    }
    @Override
    public void onClick(View v)
    {
        if(v.getId()==R.id.simpleRadioButton1)
        {
            Toast.makeText(getApplicationContext(), "You Selected Python", Toast.LENGTH_SHORT).show();
        }
        else
        {
            Toast.makeText(this, "You Selected Java", Toast.LENGTH_SHORT).show();
        }
        // TODO Auto-generated method stub
        //button.setBackgroundColor(Color.WHITE);
    }
}
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ChekBOX
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    CheckBox android,java,php;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       android = (CheckBox) findViewById(R.id.androidCheckBox);
       android.setOnClickListener(this);
       java = (CheckBox) findViewById(R.id.javaCheckBox);
       java.setOnClickListener(this);
       php = (CheckBox) findViewById(R.id.phpCheckBox);
       php.setOnClickListener(this);
    }
    @Override
    public void onClick(View v)
    {
       switch (v.getId())
       {
            case R.id.androidCheckBox:
               if (android.isChecked())
                   Toast.makeText(getApplicationContext(), "Android", Toast.LENGTH_LONG).show();
            break;
            case R.id.javaCheckBox:
                if (java.isChecked())
                    Toast.makeText(getApplicationContext(), "Java", Toast.LENGTH_LONG).show();
                break;
            case R.id.phpCheckBox:
                if (php.isChecked())
                    Toast.makeText(getApplicationContext(), "PHP", Toast.LENGTH_LONG).show();
                break;
        }
    }
}

In XMl :
 <CheckBox
        android:id="@+id/androidCheckBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="false"
        android:padding="20dp"
        android:text="android"
        android:textColor="#44f"
        android:textSize="20dp"
        android:textStyle="bold|italic" />
    <CheckBox
        android:id="@+id/javaCheckBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:checked="false"
        android:padding="20dp"
        android:text="java"
        android:textColor="#f44"
        android:textSize="20dp"
        android:textStyle="bold|italic" />
    <CheckBox
        android:id="@+id/phpCheckBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="false"
        android:padding="20dp"
        android:text="php"
        android:textColor="#444"
        android:textSize="20sp"
        android:textStyle="bold|italic" />
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Chekbox (diffrent logic)
package com.example.empty_activity_app;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity
{

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void onCheckboxClicked(View view)
    {
        // Is the view now checked?
        boolean checked = ((CheckBox) view).isChecked();
        switch(view.getId())
        {
            case R.id.checkbox_meat:
                if (checked)
                {
                    Toast.makeText(getApplicationContext(), "Non_veg", Toast.LENGTH_LONG).show();
                }
                break;
            case R.id.checkbox_cheese:
                if (checked)
                {
                    Toast.makeText(getApplicationContext(), "Veg", Toast.LENGTH_LONG).show();
                }
                break;
        }
    }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <CheckBox android:id="@+id/checkbox_meat"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Non_Veg"
        android:onClick="onCheckboxClicked"/>
    <CheckBox android:id="@+id/checkbox_cheese"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Veg"
        android:onClick="onCheckboxClicked"/>
</LinearLayout>

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Progress Bar

In XML :
<ProgressBar
        android:id="@+id/simpleProgressBar"
        style="@style/Widget.AppCompat.ProgressBar.Horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="70dp"
        android:max="100"
        android:progress="00"
        android:indeterminate="true"
       />
    <Button
        android:id="@+id/startButton"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="120dp"
        android:background="#0f0"
        android:text="Start"
        android:textColor="#fff"
        android:textSize="20sp"
        android:textStyle="bold" />
In JAVA :
 package com.example.empty_activity_app;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity
{
    int progress = 0;
    ProgressBar simpleProgressBar;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        simpleProgressBar = (ProgressBar) findViewById(R.id.simpleProgressBar);
        Button startButton = (Button) findViewById(R.id.startButton);
        // perform click event on button
        startButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                setProgressValue(progress);
            }
        });
    }
    private void setProgressValue(final int progress) {
        // set the progress
        simpleProgressBar.setProgress(progress);
        // thread is used to change the progress value
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                setProgressValue(progress + 10);
            }
        });
        thread.start();
    }
}
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List View
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    ListView simpleList;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String countryList[] = {"India", "China", "australia", "Portugle", "America", "NewZealand"};
        simpleList = (ListView)findViewById(R.id.simpleListView);
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,R.layout.activity_main,R.id.textView,countryList);
        simpleList.setAdapter(arrayAdapter);
        simpleList.setOnItemClickListener(this);
    }
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
    {
        String month= adapterView.getItemAtPosition(i).toString();
        Toast.makeText(getApplicationContext(), "Clicked"+month, Toast.LENGTH_LONG).show();
    }
}

In XML :
 <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="25dp"
        android:text="Country's" />
    <ListView
        android:id="@+id/simpleListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
	android:divider="#f00"
	android:dividerHeight="1dp"
	android:listSelector="#0f0"/>
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GridView
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
    GridView simpleGrid;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String countryList[] = {"India", "China", "australia", "Portugle", "America", "NewZealand"};
        simpleGrid = (GridView)findViewById(R.id.simpleGridView);
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,R.layout.activity_main,R.id.textView,countryList);
        simpleGrid.setAdapter(arrayAdapter);
        simpleGrid.setOnItemClickListener(this);
    }
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
    {
        String month= adapterView.getItemAtPosition(i).toString();
        Toast.makeText(getApplicationContext(), "Clicked: "+month, Toast.LENGTH_LONG).show();
    }
}

XML :
  <GridView
        android:id="@+id/simpleGridView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:numColumns="3"/>

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ImageView
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity  {
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        ImageView simpleImageViewCat = (ImageView) findViewById(R.id.simpleImageViewCat);//get the id of first image view
        ImageView simpleImageViewDog = (ImageView) findViewById(R.id.simpleImageViewDog);//get the id of second image view
        simpleImageViewCat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(), "CAT", Toast.LENGTH_LONG).show();//display the text on image click event
            }
        });
        simpleImageViewDog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(), "DOG", Toast.LENGTH_LONG).show();//display the text on image click event
            }
        });
    }

}

XML :
<ImageView
        android:id="@+id/simpleImageViewCat"
        android:layout_width="fill_parent"
        android:layout_height="200dp"
        android:scaleType="fitXY"
        android:src="@drawable/cat" />
    <ImageView
        android:id="@+id/simpleImageViewDog"
        android:layout_width="fill_parent"
        android:layout_height="200dp"
        android:layout_below="@+id/simpleImageViewCat"
        android:layout_marginTop="10dp"
        android:scaleType="fitXY"
        android:src="@drawable/dog" />

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Scroll View : Vertical

XML :
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fillViewport="false">
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView android:id="@+id/loginscrn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="80dp"
            android:text="ScrollView"
            android:textSize="25dp"
            android:textStyle="bold"
            android:layout_gravity="center"/>
        <TextView android:id="@+id/fstTxt"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:text="Welcome to Tutlane"
            android:layout_gravity="center"/>
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button One" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Two" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Three" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Four" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Five" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Six" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Seven" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Eight" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="60dp"
            android:text="Button Nine" />
    </LinearLayout>
</ScrollView>

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Scroll View : Horizontal
<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fillViewport="true">
    <LinearLayout
        android:orientation="horizontal" android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="150dp">
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button One" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Two" />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Three" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Four" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Five" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Six" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Seven" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Eight" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button Nine" />
    </LinearLayout>
</HorizontalScrollView>
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Custom Toast Alert

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/custom_toast_container"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:background="#80CC28">
    <ImageView android:src="@drawable/ic_notification"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginRight="10dp" />
    <TextView android:id="@+id/txtvw"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="13dp"
        android:textColor="#FFF"
        android:textStyle="bold"
        android:textSize="15dp" />
</LinearLayout>

Design :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btnShow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Custom Toast"
        android:layout_marginTop="150dp" android:layout_marginLeft="110dp"/>
</LinearLayout>

Code :
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity  {
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = (Button)findViewById(R.id.btnShow);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                LayoutInflater inflater = getLayoutInflater();
                View layout = inflater.inflate(R.layout.custom_toast, (ViewGroup) findViewById(R.id.custom_toast_container));
                TextView tv = (TextView) layout.findViewById(R.id.txtvw);
                tv.setText("Custom Toast Notification");
                Toast toast = new Toast(getApplicationContext());
                toast.setGravity(Gravity.CENTER_VERTICAL, 0, 100);
                toast.setDuration(Toast.LENGTH_LONG);
                toast.setView(layout);
                toast.show();
            }
        });
    }

}
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Time Picker :
package com.example.empty_activity_app;
        import androidx.appcompat.app.AppCompatActivity;
        import android.os.Bundle;
        import android.view.Gravity;
        import android.view.LayoutInflater;
        import android.view.View;
        import android.view.ViewGroup;
        import android.widget.Button;
        import android.widget.TextView;
        import android.widget.TimePicker;
        import android.widget.Toast;
public class MainActivity extends AppCompatActivity  {
    TextView time;
    TimePicker simpleTimePicker;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        time = (TextView) findViewById(R.id.time);
        simpleTimePicker = (TimePicker) findViewById(R.id.simpleTimePicker);
        simpleTimePicker.setIs24HourView(false); // used to display AM/PM mode
        // perform set on time changed listener event
        simpleTimePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
            @Override
            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                // display a toast with changed values of time picker
                Toast.makeText(getApplicationContext(), hourOfDay + "  " + minute, Toast.LENGTH_SHORT).show();
                time.setText("Time is :: " + hourOfDay + " : " + minute); // set the current time in text view
            }
        });
    }

}

XML :
<RelativeLayout 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"
    tools:context=".MainActivity">

    <TimePicker
        android:id="@+id/simpleTimePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:padding="20dp"
        android:timePickerMode="spinner" />
    <TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:text="Time Is ::"
        android:textColor="#090"
        android:textSize="20sp"
        android:textStyle="bold" />
</RelativeLayout>

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Date Picker
<RelativeLayout 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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <DatePicker
        android:id="@+id/simpleDatePicker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#150"
        android:datePickerMode="spinner" />

    <Button
        android:id="@+id/submitButton"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/simpleDatePicker"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:background="#150"
        android:text="SUBMIT"
        android:textColor="#fff"
        android:textSize="20sp"
        android:textStyle="bold" />
</RelativeLayout>

Java :

package com.example.empty_activity_app;
        import androidx.appcompat.app.AppCompatActivity;
        import android.os.Bundle;
        import android.view.Gravity;
        import android.view.LayoutInflater;
        import android.view.View;
        import android.view.ViewGroup;
        import android.widget.Button;
        import android.widget.DatePicker;
        import android.widget.TextView;
        import android.widget.TimePicker;
        import android.widget.Toast;
public class MainActivity extends AppCompatActivity  {
    DatePicker simpleDatePicker;
    Button submit;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        // initiate the date picker and a button
        simpleDatePicker = (DatePicker) findViewById(R.id.simpleDatePicker);
        submit = (Button) findViewById(R.id.submitButton);
        // perform click event on submit button
        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // get the values for day of month , month and year from a date picker
                String day = "Day = " + simpleDatePicker.getDayOfMonth();
                String month = "Month = " + (simpleDatePicker.getMonth() + 1);
                String year = "Year = " + simpleDatePicker.getYear();
                // display the values by using a toast
                Toast.makeText(getApplicationContext(), day + "\n" + month + "\n" + year, Toast.LENGTH_LONG).show();
            }
        });
    }

}

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