Execute code on main thread in Android without access to an Activity?

Question

I have an Android service that starts and maintains a background thread. From time to time, the background thread needs to do a callback on the main thread. I'm stumped as to how to do this. I can't call this.runOnUiThread because "this" is an instance of Service, not Activity, and a Service doesn't have the runOnUiThread method. I also can't create or execute an AsyncTask, because the documentation for AsyncTask says that both the constructor and the execute method must be invoked from the UI thread. Do I need to maintain a reference to the activity that is using the service and call its runOnUiThread method, or is there another way to run something on the UI thread? Thanks.

Accepted Answer

I'm using following code from time to time if I do not hold direct access to Activity (for a reason or another);

```
new Handler(Looper.getMainLooper()).post(mYourUiThreadRunnable);
```

Execute code on main thread in Android without access to an Activity?

Solution

Problem