Intent.FLAG_ACTIVITY_CLEAR_TOP doesn't deletes

问题:

I am developing the application in which i want to close whole application on button click. I know in android we should not think about to close the application because android does that automatically from this Is quitting an application frowned upon?. but yet i want to close my application.

So what i am doing to close application is i am using Intent.FLAG_ACTIVITY_CLEAR_TOP flag to delete the activity stack.

Intent intent = new Intent(Activity3.this, FinishActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();

And in onCreate of FinishActivity.class i am calling this.finish() but application is not get closed and previous activity gets reopened.

FinishActivity.class

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    this.finish();
}

Update :

Here is the scenario

MainActivity->Activity2->Activity3->FinishActivity

Here Activity2 is gets opened after finishing the activity.

How do i achieve this? Any idea and suggestion will be appreciated.

Thanks & Regards

回答1:

Use this--

 Intent intent = new Intent(Activity3.this, FinishActivity.class);
 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | 
 Intent.FLAG_ACTIVITY_NEW_TASK);
 intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
 startActivity(intent);
 finish();

Edited--New Answer and would work perfectly..

just taking an example...do it accordingly what your project needs--

I am taking three Activity class A, B and C..and I have applied a close button on the view of class C Activity. If you want then by the Back button you can go to the previous Activity and when you press the close button then you would exit from apps..have a look--

public class AActivity extends Activity {

  /** Called when the activity is first created. */
  @Override
   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Intent i = new Intent(this, B.class);
    startActivityForResult(i, 1);
}

@Override
protected void onActivityResult(final int requestCode,
        final int resultCode, final Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);

    if (resultCode == 5) {
        finish();
    }
}
}

Take next class activity--

   public class B extends Activity {
    /** Called when the activity is first created. */
   @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.b);

    Intent i = new Intent(this, C.class);
    startActivityForResult(i, 2);
}

@Override
protected void onActivityResult(final int requestCode,
        final int resultCode, final Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);

    if (resultCode == 5) {
        setResult(5);
        finish();
    }
}
}

Take last activity--

    public class C extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.c);
}

    // close button..set by xml view..you can set it by button listener.
public void close(View v) {
    setResult(5);
    finish();
}
}

Hopefully, it would solve your problem..cheers!

回答2:

Give this a try. This should clear your activity stack.

Intent i = new Intent(this,MyActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);

回答3:

This finally worked for me 100% of the time. I tried all of the flags standalone, never worked for all instances of the code. Used all the flags everywhere I want this functionality, about 5 different places, and it now works.

            Intent intent = new Intent(actvSignIn.this, actvNearbyPlaces.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
            startActivity(intent);
            finish();

回答4:

From documentation for Intent.FLAG_ACTIVITY_CLEAR_TOP

If set, and the activity being launched is already running in the current task, then instead of launching a new instance of that activity, all of the other activities on top of it will be closed and this Intent will be delivered to the (now on top) old activity as a new Intent.

So to get it work your FinishActivity must be first one in your Activity stack. In any other cases this solution wouldn't give you anything.

You must perform several steps to perform this:

1) Make FinishActivity as your launcher activity.

2) Do not provide any view for it and start first Activity of your application directly from onCreate callback :

3) Redefine onRestart callback:

Code sample:

private boolean isNeedToContinue = true;

@Override
protected void onCreate(Bundle arg0) {
    super.onCreate(arg0);
}

@Override
protected void onResume() {
    super.onResume();
    if (isNeedToContinue) {
                    startActivity(new Intent(this,FirstVisibleActivity.class));
                    isNeedToContinue = false;
    } else {
        finish();
    }
}

@Override
protected void onRestart() {
    super.onRestart();
    finish();
    isNeedToContinue = false;
}

I guess this is all you need. Good luck!

回答5:

setFlags(Intent.FLAG_ACTIVITY_NEW_TASK| Intent.FLAG_ACTIVITY_CLEAR_TOP);

apart from that set launchMode to "singleTop" in FinishActivity definition in xml, overwrite onNewIntent method , you can pass some additional information as part of intent , instated of finishing your activity in onCreate finish it in onNewIntent method of activity based on some signal from calling activity or simply finish it based on your need . It maybe possible your other activities have different lauchmodes that's why they are not finishing .

回答6:

This worked for me:

Intent intent = new Intent(Activity3.this, FinishActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();

回答7:

Try Like this Way this is work for me:

Intent intent = new Intent(Activity3.this, FinishActivity.class);
intent.addFlags(android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();

instead of your code

Intent intent = new Intent(Activity3.this, FinishActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();

回答8:

Try this:

Intent intent = new Intent(Activity3.this, FinishActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish();

回答9:

As other answers have the following should work.

Intent intent = new Intent(Activity3.this, FinishActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);

For API level < 11, Intent.FLAG_ACTIVITY_CLEAR_TASK is not available. Instead I used IntentCompat.FLAG_ACTIVITY_CLEAR_TASK from support library.

See IntentCompat

Might help someone stumbling across.

回答10:

Also you can use finishAffinity() function in last activity like:

finishAffinity()
startHomeActivity()

Hope it'll be useful.