Question

I have an activity, which is a singleTask:

public class MyActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        System.out.printf("### MyAcitvity.onCreate: " + getIntent().getExtras());
    }

    @Override
    protected void onResume() {
        super.onResume();
        System.out.println("### MyActivity.onResume: " + getIntent().getExtras());
    }

    public void toNext(View v) {
        startActivity(new Intent(this, AaaActivity.class));
    }
}

and:

<activity android:name=".MyActivity" android:launchMode="singleTask" />

No it has been started, and it started another activity called AaaActivity.

public class AaaActivity extends Activity {

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

    public void jumpToFirst(View v) {
        Intent intent = new Intent(this, MyActivity.class);
        intent.putExtra("aaa","bbb");
        startActivity(intent);
    }

}

In the later one, there is a button which will trigger the jumpToFirst method to start the first one, and pass a data pair aaa=bbb. Since MyActivity is singleTask, it won’t create a new one, instead, it will just back to the existing MyActivity instance.

My question is: how to get the passing extra data from AaaActivity in MyActivity?

You can see I have logged onCreate and onResume methods, but it prints null extra data.

11-16 08:44:17.833: INFO/System.out(5171): ### MyAcitvity.onCreate: null
11-16 08:44:19.417: INFO/System.out(5171): ### MyActivity.onResume: null
11-16 08:44:26.041: INFO/System.out(5171): ### MyActivity.onResume: null
11-16 08:44:28.897: INFO/System.out(5171): ### MyActivity.onResume: null

Answer 1

Try setting the launchMode type of your MyActivity as singleTop and then override the following method to look for the new intent:

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    setIntent(intent);
    //now getIntent() should always return the last received intent
}