Android getting result of AsyncTask in main Activity and add views to XML layout outside onCreate method

Question

I'm trying to obtain a list of videos from `Youtube` to be displayed on my `Activity`. I've created the main activity `MediaActivity.java` with two methods, `onCreate` and `getResult` which is called from the `onPostExecute` method in the `AsyncTask` class. Here is the `MediaActivity` code: ``` public class MediaActivity extends Activity { YoutubeConnect youtubeRequest = new YoutubeConnect(); ViewGroup media; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); youtubeRequest.execute(); setContentView(R.layout.media); media = (ViewGroup) this.findViewById(R.layout.media); } public void getResult(String result) throws JSONException { JSONObject jsonObj = new JSONObject(result); JSONObject jsonObj2 = jsonObj.getJSONObject("feed"); JSONArray the_json_array = jsonObj2.getJSONArray("entry"); int size = the_json_array.length(); for (int i = 0; i < size; i++) { //get all infos [...] LinearLayout main = new LinearLayout(this); main.setOrientation(0);…

Accepted Answer

That exception probably comes from you instantiating a new `MediaActivity` instead of using the `Activity` instance from which you started the thread:

```
MediaActivity mainthread = new MediaActivity();//don't do this
```

Instead pass a reference of your `MediaActivity` in the `YoutubeConnect` task and use that reference to call `getResult`:

```
private MediaActivity activityRef;

public YoutubeConnect(MediaActivity activityRef) {
     this.activityRef = activityRef;
}
```

and in the `onPosteExecute` method:

```
@Override
protected void onPostExecute(String result) {
    try {
        activityRef.getResult(result); // you should have some ckecks to see if the activity is still available.
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
```

Then to make a new `YoutubeConnect` task:

```
    YoutubeConnect youtubeRequest;
    ViewGroup media;

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.media);
        youtubeRequest = new YoutubeConnect(this); 
        youtubeRequest.execute();
        media = (ViewGroup) this.findViewById(R.layout.media);
    }
```

Also, with this:

```
media = (ViewGroup) this.findViewById(R.layout.media);
```

You're searching for a `View` in the current layout by a layout file name and not an `id`. It should be like this:

```
media = (ViewGroup) this.findViewById(R.id.view_id_from_the_layout);
```

Android getting result of AsyncTask in main Activity and add views to XML layout outside onCreate method

Solution

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