android examples_ activity life cycle example in android

7/29/2019 Android Examples_ Activity Life Cycle Example in Android

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WEDNESDAY, JULY 27, 2011

Activity Life Cycle Example In Android

Activity Life Cycle ::

Below shows the methods of Activity

a)onCreate()

b)onStart()

c)onPause()

d)onResume()

e)onStop()

f) onDestroy()

The above figure shows how and when activity is created and when it is pausedand destroyed.

means when the resources are low OS will kill the activity.

onCreate() ::This method is called when first time activity is created.

onStart()::This method is called just before your activity becomes visible on the

screen.

onResume()::This method is called after onStart() method and if your activity is

the foreground activity on the screen.

onPause()::This method is called when your activity is just about to call another

activity so that the current activity has to be paused and the new activity has to be

resumed. Here the previous activity is not stopped but it loss the foreground

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Activity Life Cycle ExampleIn Android

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visibility means it goes as background activity.

onStop()::This method is called when your activity is no longer visible on the

screen.

onDestroy()::This method is called when your current activity has the last

chance to do any processing before it is destroyed.

Activity Life Cycle Example ::

Create a new project with the name BasicActivityExample and create a class

with the name LifeCycleActivity as a main activity.

// LifeCycleActivity.java

package com.android.tutorial;

import android.app.Activity;

import android.os.Bundle;

import android.widget.Toast;

publicclass LifeCycleActivity extends Activity {

/** Called when the activity is first created. */

@Override

publicvoid onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Toast.makeText(this, "onCreate()",

Toast.LENGTH_LONG).show();

}

@Override

protectedvoid onStart() {

//the activity is become visible.

super.onStart();

Toast.makeText(this, "onStart()",


}

@Override

protectedvoid onPause() {
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super.onPause();

Toast.makeText(this, "onPause()",


}

@Override

protectedvoid onResume() {

// TODO Auto-generated method stub

super.onResume();

Toast.makeText(this, "onResume()",


}

@Override

protectedvoid onStop() {

//the activity is no longer visible.

super.onStop();

Toast.makeText(this, "onStop()", Toast.LENGTH_LONG).show();

}

@Override

protectedvoid onDestroy() {

//The activity about to be destroyed.

super.onDestroy();

Toast.makeText(this, "onDestroy()",


}

}

In the above program we wrote all the Life Cycle Methods. Here

Toast.makeText(...) method is used to display the text on the screen.

//main.xml

The above program is the best and simple example how the activity methods will

execute one by one.Remember when the application is started see the bottom it


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Posted by manikanta at 11:10 PM

display's which methods are exeuted when an an activity is running.

After all the few seconds click on ESC in the keyboard or press back button in

your emulator then you may see the methods which are executed when an

application is destroyed.

PLEASE LET ME KNOW IF U ARE FACING ANY PROBLEMS WITH THIS

APPLICATION AND U NEED TO KNOW MORE INFORMATION REGARDING

THIS ACTIVITY LIFE CYCLE PLEASE COMMENT IT.

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3 comments:

Venkateswara Reddy July 15, 2012 at 4:06 AM

hi,this information is good ,for a beginner but it should be in more clarity.

Reply

Venkata Reddy Nallamilli November 1, 2012 at 11:37 PM

ok good.but try to give the example with more Activities.

by using that we can understand more about the lifecycle phases...

Reply

Thulasiram December 11, 2012 at 2:02 AM

Reply
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