//Activity Life Cycle
import android.app.Activity;  
import android.os.Bundle;  
import android.util.Log;  
  
public class MainActivity extends Activity {  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        Log.d("lifecycle","onCreate invoked");  
    }  
    @Override  
    protected void onStart() {  
        super.onStart();  
        Log.d("lifecycle","onStart invoked");  
    }  
    @Override  
    protected void onResume() {  
        super.onResume();  
        Log.d("lifecycle","onResume invoked");  
    }  
    @Override  
    protected void onPause() {  
        super.onPause();  
        Log.d("lifecycle","onPause invoked");  
    }  
    @Override  
    protected void onStop() {  
        super.onStop();  
        Log.d("lifecycle","onStop invoked");  
    }  
    @Override  
    protected void onRestart() {  
        super.onRestart();  
        Log.d("lifecycle","onRestart invoked");  
    }  
    @Override  
    protected void onDestroy() {  
        super.onDestroy();  
        Log.d("lifecycle","onDestroy invoked");  
    }  
}  

//Implicit/Explicit Intent Example
//activity_main.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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Intent Example"
        android:id="@+id/textView2"
        android:clickable="false"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="42dp"
        android:background="#3e7d02"
        android:textColor="#ffffff" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Explicit Intent Example"
        android:id="@+id/explicit_Intent"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="147dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Implicit Intent Example"
        android:id="@+id/implicit_Intent"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

//activity_second.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="This is Second Activity"
        android:id="@+id/textView"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>


//MainActivity.java
package com.example.empty_activity_app;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity
{
    Button explicit_btn, implicit_btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        explicit_btn = (Button)findViewById(R.id.explicit_Intent);
        implicit_btn = (Button) findViewById(R.id.implicit_Intent);

        //implement Onclick event for Explicit Intent
        explicit_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new  Intent(getBaseContext(), ResultActivity.class);
                startActivity(intent);
            }
        });

        //implement onClick event for Implicit Intent
        implicit_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse("https://www.abhiandroid.com"));
                startActivity(intent);
            }
        });
    }
}
// ResultActivity.java
package com.example.empty_activity_app;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.Toast;

/**
 * Created by surdasari on 27-07-2017.
 */

public class ResultActivity  extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.result);
        Toast.makeText(getApplicationContext(), "We are moved to second Activity",Toast.LENGTH_LONG).show();
    }
}
//AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.empty_activity_app">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Empty_Activity_APP">
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ResultActivity" >
        </activity>
    </application>
</manifest>