Question

I would like to notify ViewPagerAdapter that dataset changed in Loader.onLoadFinish callback function.

It is prevented because state of fragments might be saved.

From LoaderManager.LoaderCallbacks.onLoadFinished(Loader loader, D data) method documentation:

Note that normally an application is not allowed to commit fragment transactions while in this call, since it can happen after an activity’s state is saved.`

How can I overcome this problem? How can I check in which state Activity is and commit Fragment transaction?

Answer 1

I’ve come with following solution:

Method changeCursorInOtherThread is used in onLoadFinished and onLoaderReset.

Handler is created in Activity:

private Handler mHandler = new Handler();

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mSaved = true;

}

private void changeCursorInOtherThread(final Cursor data) {
    if(!mSaved){
        mHandler.post(new Runnable() {

            @Override
            public void run() {
                mViewPagerAdapter.changeCursor(data);
            }
        });
    }
}