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Sometime we need to pass data or parameter to another Activity on Android. Only one activity is active at once. An activity open new activity for result and opened activity need parameter to set their interface or another option based on request. So it is important a system can handle sending and retrieve parameter between two Activity.

To open an activity and wait for a result, we can use this sintax

Intent newIntent = new Intent(this.getApplicationContext(), ActivityClass2.class);
startActivityForResult(newIntent, 0);

ActivityClass2 is the class name of activity that we need to create and then open it from current activity. startActivityForResult is a method to run newActivity. Later we can have the result by add this function on current Activity

protected void onActivityResult(int requestCode, int resultCode, Intent data)

First to send a data or parameter to newActivity we can use this sintax

Bundle bundle = new Bundle();
bundle.putString(”param1″, “test”);

Intent newIntent = new Intent(this.getApplicationContext(), ActivityClass2.class);
newIntent.putExtras(bundle);
startActivityForResult(newIntent, 0);

On ActivityClass2, we can read this parameter using this sintax

Bundle bundle = this.getIntent().getExtras();
String param1 = bundle.getString(”param1″);

be carefull to use param1, because it can be null if we didn’t set it.

So it is very easy to send or passing data or parameter between two activity in Android. One last thing is to return a value for startActivityForResult, we can add this line code to close ActivityClass2 and return focus to opener plus send data to opener activity.

Bundle bundle = new Bundle();
bundle.putString(”status”, “OK”);
Intent mIntent = new Intent();
mIntent.putExtras(bundle);
setResult(RESULT_OK, mIntent);
finish();