contextthemewrapper cannot be cast to activity

Question

in my small app i have a PageAdapter->Fragment->ListView->ImageView. On onImageClick i want display my image in another Fragment (Fragment3), but when i load an image in my Fragment3 get an Exception ``` public class Fragment3 extends DialogFragment { ImageLoader imageLoader; ... @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { view = (ViewGroup) inflater.inflate(R.layout.fragment3_layout, container, false); imageView = (ImageView) view.findViewById(R.id.imageViewFrag3); detail = (TextView) view.findViewById(R.id.textViewFrag3); imageUrl = getArguments().getString("URL"); imageView.setTag(imageUrl); activity=this; imageLoader = new ImageLoader(activity.getActivity().getApplicationContext()); imageLoader.DisplayImage(imageUrl, (Activity) activity.getActivity(), imageView); return view; } ... } ``` and code which creates an Exception. When i create a fragment and add the ListView all passed ok, but when i create another fragme…

Accepted Answer

```
Activity a= (Activity)(photoToLoad.imageView.getContext());
```

You can't assume a `Context` can be casted to an `Activity`. Hence the exception: You're attempting to cast a `Context` that is in fact a `ContextThemeWrapper` to an `Activity`.

You can replace

```
Activity a= (Activity)(photoToLoad.imageView.getContext());
a.runOnUiThread(bd);
```

with e.g.

```
photoToLoad.imageView.post(bd);
```

to post a `Runnable` to UI thread message queue, similar to `Activity` `runOnUiThread()`.

contextthemewrapper cannot be cast to activity

Solution

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