CODEWITHSUNDEEP
javaandroidandroid-activity
kwiqsilver
kwiqsilver

Reputation: 1027

Prune back history after completing activity

I have the following activity path:

Main -> A0 -> A1 -> A2 -> B

or

Main -> B

On Main, the user can select to either show something on B, or to create something new with the A series. After completing the A series, it goes to B.

When the user gets to B via the A route, I want the back button to go to Main. But when the user is in the A series, I want the back button to go to the previous A (or Main from the first A).

I tried using FLAG_ACTIVITY_NO_HISTORY when I create the intents, but that just makes everything go back to Main.

Is there a way to mark the activities for removal once I hit a threshold?

Upvotes: 1

Views: 47

Answers (3)

Raghubansh Mani
Raghubansh Mani

Reputation: 305

You can fire a new intent for Main activity with SINGLE_TOP and CLEAR_TOP flags in onBackPressed of B. So no matter how you landed at B, pressing back takes you to Main with all history cleared. No need to mess with A series activities.

Upvotes: 0

amalBit
amalBit

Reputation: 12181

You could add a BroadcastReceiver in all activities you want to close (A0, A1, A2):

public class MyActivity extends Activity {
    private FinishReceiver finishReceiver;
    private static final String ACTION_FINISH = 
           "com.mypackage.MyActivity.ACTION_FINISH";

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

        finishReceiver= new FinishReceiver();
        registerReceiver(finishReceiver, new IntentFilter(ACTION_FINISH));
    }

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

        unregisterReceiver(finishReceiver);
    }

    private final class FinishReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(ACTION_FINISH)) 
                finish();
        }
    }
}

To close these activities trigger the following broadcast from Activity B.

sendBroadcast(new Intent(ACTION_FINISH));

Here is the github example project for the same.

Upvotes: 2

user4584887
user4584887

Reputation:

Define the logic in this very way

In Series of Activity A define the logic in this very way

 public static Activity A=null;
  //in onCreate();

   A=this;

  //Same way in B
  public static Activity B=null;

  B=this

now wherever you want the back condition to be checked override the OnbackPressed.

@Override
public void onBackPressed() 
    {
    if(Activity_A.A!=null)
    {
    finish();
    return;
    }

    if(Activity_B.B!=null){
    //your condition
    finish();
    }
    }

Upvotes: 0

Related Questions