LoaderManager 不会从子类触发

Question

我有 My MainActivity，它只是实现 LoaderManager ：

public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor>

在被覆盖的方法中，我为RecycleView 创建了一个new 适配器，例如：

@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
    return NYTLoader.newNYTInstance(this);
}

@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
    NYTAdapter adapter = new NYTAdapter(cursor, this);
    adapter.setHasStableIds(true);
    mRecyclerView.setAdapter(adapter);
    int columnCount = getResources().getInteger(R.integer.list_column_count);
    StaggeredGridLayoutManager sglm =
            new StaggeredGridLayoutManager(columnCount, StaggeredGridLayoutManager.VERTICAL);
    mRecyclerView.setLayoutManager(sglm);
}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
    mRecyclerView.setAdapter(null);
}

现在在我的NYTAdapter 中，我再次 实现了LoaderManager：

public class NYTAdapter extends RecyclerView.Adapter<NYTAdapter.ViewHolder> implements LoaderManager.LoaderCallbacks<Cursor>

创建另一个适配器：

@Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
    Log.d(TAG, "onCreateLoader: ");
    return WeatherLoader.newAllWeatherInstance(context);
}

@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor cursor) {
    this.cursor = cursor;

    Log.d(TAG, "onLoadFinished: ");
    WeatherAdapter adapter = new WeatherAdapter(cursor, context);
    adapter.setHasStableIds(true);
    mRecyclerView.setAdapter(adapter);
    int columnCount = context.getResources().getInteger(R.integer.list_column_count);
    StaggeredGridLayoutManager sglm =
            new StaggeredGridLayoutManager(columnCount, StaggeredGridLayoutManager.HORIZONTAL);
    mRecyclerView.setLayoutManager(sglm);

}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
    mRecyclerView.setAdapter(null);
}

但是问题是，NYTAdapter里面的覆盖方法没有触发，不知道为什么？

Answer 1

您所要做的就是在您的活动或片段上调用getLoaderManager.initLoader。