Send result back multiple activities and finish except first activity

Question

I need the flow of Activty4 Pass the data to Activity1 and close all the activities except Activity1.

Activity1-> open Activity2(it has tabview)
Activity2-> open Activity3
Activity3-> Pass the data to Activity1 and also close Activity2 and Activity3

Answer 1

On activity1 use the startActivityForResult call to start the activity2 so you can get the result of it:

Intent i = new Intent(this, Activity2.class);
startActivityForResult(i, 1);

On activity2:

Intent i = new Intent(this, Activity3.class);
startActivityForResult(i, 2);

On activity3 at the point you set the result:

Intent returnIntent = new Intent();
returnIntent.putExtra("result",result);
setResult(Activity.RESULT_OK,returnIntent);
finish();

This sets the result and closes Activity3 with the call to finish.

Now, on Activity2 you should add this code to get the result:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 2) {
        if (resultCode == Activity.RESULT_OK){
            String result = data.getStringExtra("result");
            Intent returnIntent = new Intent();
            returnIntent.putExtra("result", result); // send the result of Activity3
            setResult(Activity.RESULT_OK,returnIntent);
            finish();
        }
        if (resultCode == Activity.RESULT_CANCELED) {
            //Write your code if there's no result
        }
    }
}

And you can get the result on Activity1:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 1) {
        if(resultCode == Activity.RESULT_OK){
            String result = data.getStringExtra("result"); // Now you have the result here
        }
        if (resultCode == Activity.RESULT_CANCELED) {
            //Write your code if there's no result
        }
    }
}

Notice you should get consistent with the integers you set on the startActivityForResult and the requestCode you receive, I recommend using constants here.

If you need more info have a look at https://developer.android.com/training/basics/intents/result and How to manage startActivityForResult on Android?

Answer 2

1. IMHO the best choice is using Observable pattern.

2. Activity 4 has an observable object, Activity 1,2,3 will be registered to observe it.

3. When the data in Activity 4 is ready, Activity 4 will send a signal to notify that data has been ready then Activity 1 will receive the data and activity 2 & 3 will kill itself

Answer 3

Easiest way is following Whenever you wish to exit all open activities over another activity you can do it in this way

Do this in 3rd activity

Intent intent = new Intent(this, FirstActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("your_params","param"); // data
startActivity(intent);

And in First Activity, in oncreate handle intent

 getIntent().getStringExtra("your_params");

If OnCreate don't get called, please override onNewIntent method

 @Override
 public void onNewIntent(Intent intent) {
    super.onNewIntent(intent);

    getIntent().getStringExtra("your_params");
}