How do I pass data between Activities in Android application?

Question

I have a scenario where, after logging in through a login page, there will be a sign-out button on each activity.

On clicking sign-out, I will be passing the session id of the signed in user to sign-out. Can anyone guide me on how to keep session id available to all activities?

Any alternative to this case

Answer 1

In your current Activity, create a new Intent:

String value="Hello world"; Intent i = new Intent(CurrentActivity.this, NewActivity.class);     i.putExtra("key",value); startActivity(i); 

Then in the new Activity, retrieve those values:

Bundle extras = getIntent().getExtras(); if (extras != null) {     String value = extras.getString("key");     //The key argument here must match that used in the other activity } 

Use this technique to pass variables from one Activity to the other.

Answer 2

The easiest way to do this would be to pass 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); 

Access that intent on next activity:

String sessionId = getIntent().getStringExtra("EXTRA_SESSION_ID"); 

The docs for Intents has more information (look at the section titled "Extras").