How can I pass values between Activities on Android?

Question

This is the navigation of my application:

Activity1 calls Activity2 → Activity2.finish(), call Activity3 → Activity3.finish()

When Activity3 finishes, it calls the onResume method of Activity1. Now how can I pass a value from Activity3 to Activity1?

Answer 1

Umesh shows a good technique but I think you want the opposite direction.

Step 1

When starting Activity 2 and 3, use startActivityForResult. This allows you handle the result in the calling activity.

startActivityForResult(MY_REQUEST_ID); 

Step 2

In Activities 2 and 3, call setResult(int, Intent) to return a value:

Intent resultData = new Intent(); resultData.putExtra("valueName", "valueData"); setResult(Activity.RESULT_OK, resultData); finish(); 

Step 3

In your calling activty, implement onActivityResult and get the data:

protected void onActivityResult(int requestCode, int resultCode,           Intent data) {       if (requestCode == MY_REQUEST_ID) {           if (resultCode == RESULT_OK) {             String myValue = data.getStringExtra("valueName");              // use 'myValue' return value here           }       } } 

Edit:

Technique #2

Yes, you can also use global application state by adding a class to your application that extends Application, see this StackOverflow answer

Answer 2

Use the session id to the signout activity in the intent you're using to start the activity:

Intent intent = new Intent(getBaseContext(), SignoutActivity.class); intent.putExtra("EXTRA_SESSION_ID", sessionId); startActivity(intent) 

See this tutorial.