2 Activity Life Cycle

Algorithm:

Step 1) Create a new Android Studio Project named as ActivityLifeCycle. Step 2)Goto Project Structure and open MainActivity.java file

Step 3) implement the code for all Activity Life Cycle methods.

Step 4) Add a Log message to all lifecycle methods for displaying the content on the                        Logcat.                   Log.d(tag:"lifecycle",msg:"onMethodname");

 

Step 5) Run the application from the menu bar select Run and Click on Run App option.

Android Activity Lifecycle methods

Method	Description
onCreate	called when activity is first created.
onStart	called when activity is becoming visible to the user.
onResume	called when activity will start interacting with the user.
onPause	called when activity is not visible to the user.
onStop	called when activity is no longer visible to the user.
onRestart	called after your activity is stopped, prior to the start.
onDestroy	called before the activity is destroyed.

MainActivity.java

package com.example.activitylifecycle;

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

import android.util.Log;

public class MainActivity extends AppCompatActivity { @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"); }

}

Output:

09-15 08:10:11.052 2058-2058/com.example.activitylifecycle D/lifecycle: onCreate invoked

09-15 08:10:11.052 2058-2058/com.example.activitylifecycle D/lifecycle: onStart invoked onResume invoked

09-15 08:10:19.222 2058-2058/com.example.activitylifecycle D/lifecycle: onPause invoked

09-15 08:10:19.752 2058-2058/com.example.activitylifecycle D/lifecycle: onStop invoked onDestroy invoked.