Can't Touch Views From Onpostexecute's Asynctask

I have already read all questions about this. And it's not the same case. Believe me. I know an AsyncTask doInBackground function has his own thread, and you must touch the view in

Solution 1:

Looking at the call stack, following call indicates that AsyncTask class was loaded on non-UI thread.

at android.os.HandlerThread.run(HandlerThread.java:60)

One of the Threading Rules mentioned in AsyncTask reference documentation is:

The AsyncTask class must be loaded on the UI thread. This is done automatically as of JELLY_BEAN.

Here is a bug related to this issue.

One of the solution is, load the AsyncTask class manually in Application onCreate method. This ensures the class gets loaded on main thread, before any application components uses it.

publicclassMyApplicationextendsApplication {

    @OverridepublicvoidonCreate() {

        try {
            Class.forName("android.os.AsyncTask");
        } catch (ClassNotFoundException e) {

        }

        super.onCreate();
    }
}

Remember to specify MyApplication in AndroidManifest file.

Solution 2:

The solution in this answer should force the code to be run on the ui thread. It uses the Activity#runOnUiThread(Runnable) function. Your code would end up like this:

@OverrideprotectedvoidonPostExecute(User[] users) {
    if (isCancelled() || isFinishing()) return;

    runOnUiThread(newRunnable() {

        @Overridepublicvoidrun() {
            findViewById(R.id.panelViews).removeAllViews();
            findViewById(R.id.element).setText("something");
            // ... more
        }
    });
}

Solution 3:

This occurs when you start an AsyncTask from a background thread. The onPreExecute and onPostExecute don't automatically run on the main thread but in reality the thread the AsyncTask was started from.

In other words, if you were already within a background thread when you called execute on the AsyncTask then that same thread is where the onPostExecute method is called from meaning you would get that exception.

Solution 4:

Try this, This should solve your problem, perform your task in runOnUiThread()

@OverrideprotectedvoidonPostExecute(User[] users) {

    runOnUiThread(newRunnable() {
        publicvoidrun() {

            if (isCancelled() || isFinishing()) return;

            findViewById(R.id.panelViews).removeAllViews();
            findViewById(R.id.element).setText("something");                 

        }//run
    }//runOnUiThread
}//onPostExecute