onNewIntent callback in activity

Sample code 

public class MainActivity extends AppCompatActivity {

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


        Button btn = (Button)findViewById(R.id.button);

        btn.setOnClickListener(new View.OnClickListener(){

               @Override
               public void onClick(View v) {


                   Intent intent = new Intent(MainActivity.this, MainActivity.class );
                   intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP );
                   intent.putExtra("aaa",1);
                   intent.putExtra("bbb",2);
                   intent.putExtra("ccc",3);

                   startActivity(intent);
               }
           }

        );


    }

    @Override
    protected void onNewIntent(Intent intent) {

        super.onNewIntent(intent);
        Log.d("easy", "onNewIntent called");
        if ( null != intent){
            int defaultValue = 0;
            Log.d("easy", "aaa : "+intent.getIntExtra("aaa",0));
            Log.d("easy", "bbb : "+intent.getIntExtra("bbb",0));
            Log.d("easy", "ccc : "+intent.getIntExtra("ccc",0));
        }

    }
}

Activity가 foreground로 동작하고 있을 때, 해당 Activity로 startActivity를 호출할 경우 onNewIntent Callback이 호출된다. 

주의) addFlag를 추가하지 않으면 실행되지 않음

결과 : 

09-13 17:21:41.448  7123  7123 D easy    : onNewIntent called

09-13 17:21:41.448  7123  7123 D easy    : aaa : 1

09-13 17:21:41.448  7123  7123 D easy    : bbb : 2

09-13 17:21:41.448  7123  7123 D easy    : ccc : 3