Android Studio Tutorial Activity Life Cycle (Simple Code)

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MainActivity.Java


import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(getApplicationContext(),"onCreate Invoked",Toast.LENGTH_SHORT).show();
   // Log.d("lifecycle","onCreate invoked");
}

@Override
protected void onStart() {
super.onStart();
   // Log.d("lifecycle","onStart invoked");
Toast.makeText(getApplicationContext(),"onStart Invoked",Toast.LENGTH_SHORT).show();
}

@Override
protected void onResume() {
super.onResume();
   // Log.d("lifecycle","onResume invoked");
Toast.makeText(getApplicationContext(),"onResume Invoked",Toast.LENGTH_SHORT).show();
}

@Override
protected void onPause() {
super.onPause();
Toast.makeText(getApplicationContext(),"onPause Invoked",Toast.LENGTH_SHORT).show();
//Log.d("lifecycle","onPause invoked");
}

@Override
protected void onStop() {
super.onStop();
   // Log.d("lifecycle","onStop invoked");
Toast.makeText(getApplicationContext(),"onStop Invoked",Toast.LENGTH_SHORT).show();
}

@Override
protected void onRestart() {
super.onRestart();
//Log.d("lifecycle","onRestart invoked");
Toast.makeText(getApplicationContext(),"onRestart Invoked",Toast.LENGTH_SHORT).show();
}

@Override
protected void onDestroy() {
super.onDestroy();
Toast.makeText(getApplicationContext(),"onDestroy Invoked",Toast.LENGTH_SHORT).show();
   // Log.d("lifecycle","onDestroy invoked");
}
 
}

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activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="horizontal"
    android:gravity="center"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:id="@+id/txtdisp"
        android:textColor="@color/Black"
        android:textSize="20dp"
        android:gravity="center"/>

</LinearLayout>

 

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AndroidManifest.xml

<activity
android:name=".MainActivity"
android:label="MainActivity"
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>

        </activity>

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