if i used intent to go another activity does first activity killed?

[shawn peter]

I need to know ,if i used intent to go another activity, does first activity killed?

this is my main activity.

public class MainActivity extends Activity implements OnClickListener {

	

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		

		Button login = (Button) findViewById(R.id.btnmain);

		login.setOnClickListener(this);
		Toast.makeText(this, "INSIDE MainActivity onCreate ",Toast.LENGTH_LONG).show();
	}

	

	@Override
	public void onClick(View arg0) {
		Toast.makeText(this,"INSIDE MainActivity  onClick ",Toast.LENGTH_LONG).show();

		// TODO Auto-generated method stub
		Intent i = new Intent(getApplicationContext(), PrintValue.class);
		startActivity(i);
	}

	@Override
	public void onResume() {
		super.onResume();		
		Toast.makeText(this, "INSIDE MainActivity onResume ",Toast.LENGTH_LONG).show();
	}
	
}

this is my second activity

public class PrintValue extends Activity implements OnClickListener {

	private SharedPreferences sp;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.print);
		
			
		
		Toast.makeText(this, "INSIDE PrintValue onCreate ",Toast.LENGTH_LONG).show();
		
		Button login = (Button) findViewById(R.id.btnprint);

		login.setOnClickListener(this);
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public void onClick(View arg0) {
		
		Intent i = new Intent(getApplicationContext(),
				MainActivity.class);
		startActivity(i);
	}

}

this is my 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"
    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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/btnmain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="62dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="MainActivity" />

</RelativeLayout>

this is my print.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"
    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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/btnprint"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="62dp"
        android:layout_toRightOf="@+id/textView1"
        android:text="PrintValue" />

</RelativeLayout>

when i click MainActivity button it goes to second activity(PrintValue)

it prints below
INSIDE MainActivity onClick
INSIDE PrintValue onCreate

then when i click PrintValue button again it should not prtint the "INSIDE MainActivity onCreate".But it prints the "INSIDE MainActivity onCreate" again.why ?

[Ulf Dittmer]

Read the javadocs of the Activity class; it includes a lengthy treatise of the Activity life cycle. Bottom line : Android is in charge of terminating Activities, not you.

[shawn peter]

i need to know when we use Intent to call activity does it create new instance for each time,because when i click button each time it runs first the Oncreate methods,not the Onresume methods.

[Ulf Dittmer]

The javadocs of the startActivity method talk about that.

[shawn peter]

normally i am using Intent to start activity.So in my app there is a home page.Inside home page there are several links .So i used Intent to call those activities.So when i go to sub activity,each one has home button.So when click home button i used Intent to call Home calss.Is it good method as it always called OnCreate method.Actually i don't need to call onCreate when i call home activity when i am inside sub activity?its just ok to call OnResume.

[Ulf Dittmer]

It seems that you have not read about the Activity life cycle like I suggested. There is no such thing as a subactivity.

[shawn peter]

actually i mean subactivity activity after which called main activity in my app.I know there is no activity called subactivity in Android.

[Ulf Dittmer]

So everything is clear now? If not, please do not post again about this before you have read the javadocs of the Activity class. ALL of it. You simply can not develop for Android without a deep understanding of that.

[shawn peter]

anywya i found that if i click back button of my phone it doesn't call the OnCreate method.It only calls the OnResume method.can you explain why it doesn't call OnCreate method ULF?

[Ulf Dittmer]

What do YOU think the back button does? (The Activity javadocs explain that behavior as well, so I suspect you have not read them.)

[shawn peter]

how can we get Back button behavior in programatically?is there any way?

[Ulf Dittmer]

I'm done with this topic. You don't want to learn about the Activity lifecycle - fine, suit yourself.

[ab singh]

Please go through this link
webpage
webpage
i think this can help to understand activity life cycle well