how to finish all activities and close the application in android?

问题

My application has the following flow:

Home->screen 1->screen 2->screen 3->screen 4->screen 5>Home->screen 2->Home->Screen 3

My problem is that when I am trying to close the application then Home activity opens everytime when I am trying to close the application.

I just want to close the application when user presses the back key of device on home screen.

回答1:

There is finishAffinity() method that will finish the current activity and all parent activities, but it works only in Android 4.1 or higher.

回答2:

This works well for me.

• You should using FLAG_ACTIVITY_CLEAR_TASK and FLAG_ACTIVITY_NEW_TASK flags.

  Intent intent = new Intent(SecondActivity.this, CloseActivity.class);
  //Clear all activities and start new task
  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK); 
  startActivity(intent);
  

• onCreate() method of CloseActivity activity.

  @Override 
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      finish(); // Exit 
  }
  

回答3:

Use finishAffinity() method that will finish the current activity and all parent activities. But it works only for API 16+ mean Android 4.1 or higher.

API 16+ use:

finishAffinity();

Below API 16 use:

ActivityCompat.finishAffinity(this); //with v4 support library

To exit whole app:

finishAffinity(); // Close all activites
System.exit(0);  // Releasing resources

回答4:

To clear all the activities while opening new one then do the following:

Intent intent = new Intent(getApplicationContext(), YourActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

回答5:

This works well for me in all versions. Close all the previous activities as follows:

Intent intent = new Intent(this, HomeActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // this will clear all the stack
intent.putExtra("Exit me", true);
startActivity(intent);
finish();

Then in HomeActivity onCreate() method add this to finish the MainActivity

setContentView(R.layout.main_layout);

if( getIntent().getBooleanExtra("Exit me", false)){
    finish();
    return; // add this to prevent from doing unnecessary stuffs
}

回答6:

Sometime finish() not working

I have solved that issue with

finishAffinity()

Do not use

System.exit(0);

It will finish app without annimation.

回答7:

You can try starting the Screen 3 with Intent.FLAG_ACTIVITY_CLEAR_TASK http://developer.android.com/reference/android/content/Intent.html#FLAG_ACTIVITY_CLEAR_TASK

回答8:

Add android:noHistory="true" in your activity manifest file.

回答9:

There are 2 ways for solve your problem

1) call finish() after startActivity(intent) in every activity

2) set android:launchMode="singleInstance" in every tag in menifest file

i think 2nd way is best for solving problem but you can also use first way

回答10:

public void onBackPressed() {
    super.onBackPressed();
    finishAffinity();
    System.exit(0);
}

may be this method is better usage to close all activity and clean device memory.

来源：https://stackoverflow.com/questions/20210691/how-to-finish-all-activities-and-close-the-application-in-android