android - 如何在onLoadFinish 回调方法中提交FragmentPagerAdapter 中的Fragment 事务？

Question

我想通知 ViewPagerAdapter 数据集在 Loader.onLoadFinish 回调函数中发生了变化。

它被阻止是因为 fragment 的状态可能被保存。

来自 LoaderManager.LoaderCallbacks.onLoadFinished(Loader loader, D data)方法文档:

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.`

我该如何克服这个问题？如何检查 Activity 处于哪个状态并提交 Fragment 事务？

Answer 1

我有以下解决方案:

方法changeCursorInOtherThread用于onLoadFinished和onLoaderReset。

Handler 在 Activity 中创建:

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);
            }
        });
    }
}