mainactivity.java

	final int SCAN_QR = 4;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		Intent intent = new Intent(this, CaptureActivity.class);
		startActivityForResult(intent, SCAN_QR);
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// Check which request we're responding to
		Log.w("app", "hello 1");
		if (requestCode == SCAN_QR) {
			// Make sure the request was successful
			if (resultCode == RESULT_OK) {
				Log.w("app", "hello");
			}
		}
	}

otheractivity.java

        Intent intent = new Intent();
        intent.putExtra("result", "hello");
        this.setResult(RESULT_OK, intent);

        finish();