加载第一个列表项时，在第二个片段中加载项 [英] Load item in second fragment when first list item loaded

问题描述

我正在尝试构建与 Android Fragments教程类似的内容:左侧有一个ListView片段，右侧有一个可以显示项目的片段.

I am trying to build something similar to the Android Fragments tutorial: I have a ListView fragment on the left and a fragment that can display an item on the right.

现在，我正在尝试通过SimpleCursorAdapter(我通过LoaderManager使用)加载列表中的第一项(或之后不久)自动选择列表中的第一项-全部使用Android支持库.

Now I am trying to auto-select the first item in the list as soon (or soon after) it has been loaded through the SimpleCursorAdapter (which I use through the LoaderManager)-- all using the Android support library.

public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    mAdapter = new SimpleCursorAdapter(/* options */);
    setListAdapter(mAdapter);
}

public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    CursorLoader cl = new CursorLoader(getActivity());
    /* setProjection, etc */
    return cl;
}

public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
    mAdapter.swapCursor(data);
}

public void onLoaderReset(Loader<Cursor> loader) {
    mAdapter.swapCursor(null);
}

我已经检查了各种示例实现，它们似乎都太简单了，或者只是在单击时不填充右边的片段.

I have checked various sample implementations and they all seem to be much too simple or simply don't populate the fragment on the right on load but just upon a click.

无论如何我都需要实现一个onLoadFinished，但这对我来说太晚了，因为我正在加载一个很长的列表.因此，我一直在考虑onItemLoadedListener的用法，我只会在第一次调用它时使用它.但是似乎没有那样的东西存在，所以我很困惑.

I needed to implement a onLoadFinished anyway but that is too late for me as I am loading a long list. So I was thinking along the lines of an onItemLoadedListener which I would only use the first time it is called. But nothing like that seems to exist so I am quite stuck.

感谢任何指针！

推荐答案

您反对什么太简单了?

 public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
     data.moveToFirst();
     Bundle b = new Bundle();
     // get info from that first item and put into the bundle
     ...

     ContentFrag f = new ContentFrag();
     f.setArguments(b);
     getSupportFragmentManager().beginTransaction().replace(R.id.contentLayout, f).commit();

     // instantiate and set your adapter
     ...
 }

简单！就像其他片段交易一样.

simple! Just like any other fragment transaction.

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