Objective: to complete the exit and login of Android APP

Idea: store multiple open activities in the List, open an addList, close a removeList, create a public APPCompatActivity base class (complete the activities add and remove in the base class, and the registration and cancellation of the broadcast receiver). When clicking the "exit login" button, close all open activities, and finally start LoginActivity

Here is the code:

1. Activity list control class

public class ActivityCollector {
    private ActivityCollector() {}

    private static List<Activity> actList = new ArrayList<>();

    public static void addActivity(Activity act) {
        actList.add(act);
    }

    public static void removeActivity(Activity act) {
        actList.remove(act);
    }

    public static void finishAll() {
        for (Activity act : actList) {
            if (!act.isFinishing()) {
                act.finish();
            }
        }
    }
}

2. Public base class of AppCompatActivity

public class BaseCompatActivity extends AppCompatActivity {
    protected LoginOutBroadcastReceiver locallReceiver;

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

        // When you create an activity, add it to the manager
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // Register broadcast receiver
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("com.gesoft.admin.loginout");
        locallReceiver = new LoginOutBroadcastReceiver();
        registerReceiver(locallReceiver, intentFilter);
    }

    @Override
    protected void onPause() {
        super.onPause();

        // Unregister broadcast receiver
        unregisterReceiver(locallReceiver);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // When you destroy an activity, remove it from the manager
        ActivityCollector.removeActivity(this);
    }
}

3. Implementation of exit receiver

public class LoginOutBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        ActivityCollector.finishAll();  // Destroy all activities
        Intent intent1 = new Intent(context, MainActivity.class);
        context.startActivity(intent1);
    }
}

4. Exit button

    /**
     * Logout
     */
    private void loginOut() {
        Intent intent = new Intent("com.gesoft.admin.loginout");
        sendBroadcast(intent);
    }