在点击Android的按钮上完成以前的活动

Question

My android app has 3 screen.

• Screen 1 (Home Screen)
• Screen 2
• Screen 3

Screen 1 starts Screen 2 and screen 2 starts screen 3.

I have added a button named EXIT on screen 3. What I want is when user press this button, Screen 1 and Screen 2 activities should get finished.

Answer 1

When you press the Exit button in your screen 3 you might start another activity which will kill all other activities in the stack and will close itself. Here's my working sample to do the trick.

public class ExitActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (android.os.Build.VERSION.SDK_INT >= 21) {
            finishAndRemoveTask();
        } else {
            finish();
        }
    }

    public static void exitApplication(Context context) {
        Intent intent = new Intent(context, ExitActivity.class);

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NO_ANIMATION | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);

        context.startActivity(intent);
    }
}

So you need to call exitApplication function in your Exit button onClick .

Answer 2

on exit button click write the following code:

Intent intent = new Intent(getApplicationContext(), Home.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);

This will clear all the previous activities.