Navigating from Activity A->B->C - How to pass data from C to A in onBackPressed()?

Question

1. From Activity A call Activity B
2. from B to C and while calling Activity C
3. I call finish for Activity B

Answer 1

Don't call finish() from B when opening C. Instead, call C with startActivityforResult() and then pass the data back through B when onActivityResult() in B is triggered. Something like:

ActivityB {
    onCreate(Bundle) {
        startActivityForResult(ActivityC, 0);
    }

    onActivityResult(int, int, Intent){
        setResult(resultCode, data);
        finish();
    }
}

Edit:

Apparently adding the flag Intent.FLAG_ACTIVITY_FORWARD_RESULT when calling B should actually achieve your desired result as well.

Learn somethin' new every day...

Answer 2

use shared preference

C ACTIVITY

SharedPreferences sf = getPreferences(MODE_PRIVATE); SharedPreferences.Editor editor = sf.edit(); editor.putString(key, value); editor.commit();

A ACTIVITY

SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE); String savedPref = sharedPreferences.getString(key, ""); mOutputView.setText(savedPref);

Answer 3

Where're multiple ways of doing this:

• Store the data from Activity C to Application's object and just read it in Activity A:

     ((MySuperApplication) getApplication()).setMyData(..);
  

• Pass it as Activity Result

• Store data to SharedPreference in Activity C and read it in Activity A. If it's a complex data structure - I'd suggest to use gsonto serialize object and store it as a string and then deserialize it in Activity A

Choose the one you like the most.