showDialog() is accessing old View => Error: Activity has leaked window [...]

I am writing the app and I have the following scenario: First i show an Acitivty and I show a ProgressDialog while loading data from a Server. I do the loading task in a Thread because I found this to be a solution so that the Dialog is shown correctly

showDialog(DIALOG_LOAD);

loadListThread = new  Thread(new Runnable(){
        @Override
        public void run(){

            service.execRequest();
            loadingFinishedHandler.sendEmptyMessage(0);

            MyActivity.this.dismissDialog(MyActivity.DIALOG_LOAD);
        }
    });
    loadListThread.start();

After the Thread is finished I notify a Handler. Again this is a solution I found for the problem to access Views in the activity without being in the Thread anymore

loadingFinishedHandler = new Handler(){
        @Override
        public void handleMessage(Message msg){
            showList();
        }
};

After loading is finished, I check whether I received data correctly. If not, i want to show an error dialog:

showDialog(DIALOG_ERROR);

I call the dialogs with the onCreateDialog method

public Dialog onCreateDialog(int dialogId){
    switch(dialogId){
    case DIALOG_LOAD:
        String message = getString(R.string.load);
        ProgressDialog loadDialog = new ProgressDialog(this);
        loadDialog.setMessage(messa开发者_JS百科ge);
        loadDialog.setCancelable(false);
        return loadDialog;
    case DIALOG_ERROR:
        String message = getString(R.string.error);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage(errorMessage);
        builder.setNeutralButton(getString(R.string.ok), null);

        return builder.create();
    }
    return null;
}

And here is the problem: If I change the Orientation of my phone while data is loading and an error dialog shall be created afterwards, I get this message

Activity [...] has leaked window [...] that was originally added here

I understand why this is happening. The View has been re-created, when i rotated my phone and showDialog() is obviously trying to access the old one. But I do not know how to fix it.

Does anyone has an idea?

Edit: solved it :-) I found out that I can prevent my Activity from restarting on orientation change. I read about it in this article Handling Runtime Changes

I declared in the AndroidManifest by adding

android:configChanges="orientation"

that i handle orientation changes by myself. These changes can now be handled with this method

public void onConfigurationChanged(Configuration newConfig){
    super.onConfigurationChanged(newConfig);
}

But for my case it was not necessary to add any code!

public Dialog onCreateDialog(int dialogId){
if(isFinishing()){
return null;)}...