跳至下一个活动时如何销毁上一个活动

Question

I have activity A, having timer thread. after 5 sec it jumps to activity B via intent. how to destroy activity A when you are on activity B so that back button don't let you go back to activity A.

Answer 1

You have to clear the activity backstack.

intent = new Intent(this, Activity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
StartActivity(intent);

Answer 2

当您将意图从A转移到B时，只需调用finish()

Answer 3

Try this...

MainActivity.java:

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    new Waiting(5);
}

public class Waiting {
    Timer timer;

    public Waiting(int seconds) {
        timer = new Timer();
        timer.schedule(new WaitingTask(), seconds * 1000);
    }

    class WaitingTask extends TimerTask {

        @Override
        public void run() {
            System.out.println("Hi, I'm waiting here!");

            Intent intent = new Intent(MainActivity.this,
                    MainActivity1.class);
            MainActivity.this.finish();
            startActivity(intent);
            timer.cancel();
        }

    }
}
 }

MainActivity1.java

public class MainActivity1 extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_activity1);
  }

}

Happy coding....