startActivityForResult() sample code

Activity1.java

public class Activity1 extends AppCompatActivity {

    public static final int REQUEST_CODE = 255;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_1);
    }

    public void sendMessageToActivityOnClick(View view) {
        Intent intent = new Intent(Activity1.this, Activity2.class);
        intent.putExtra(MESSAGE, "Are you there?");
        startActivityForResult(intent, REQUEST_CODE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
            String resultFromActivity2 = data.getStringExtra(RESULT);
            // use the result
        }
    }
}