android - 正确显示 SearchView 建议

Question

我最近在我的应用程序中添加了一个 SearchView(support-v7 库中提供的那个)。在我的例子中，提交按钮永远不应该使用 ACTION_SEARCH 启动一个新的 Intent，我只想显示一个建议列表，用户可以浏览并点击其中一个触发一些行动。

我认为一切都已正确设置，但我有两个大问题:

• 我第一次输入内容时，即使触发了所有事件(我使用了一些日志打印来检查这一点)，建议列表也没有显示，我必须清除搜索文本并重新开始写入，然后建议显示。这只会在我第一次搜索某些内容时发生。如果我关闭并重新打开 SearchView，它会显示自第一次尝试以来的建议。
• 为了加载建议，我通过 LoaderManager 查询了 ContentProvider，如果我打字太快，应用程序就会崩溃，提示我正在尝试重新打开一个已经-closed 对象(我猜是通过查询 ContentProvider 获得的 Cursor)。

我应该在我的代码中更改什么才能使其正常工作？

代码:

在 onCreateOptionsMenu 中:

mActivity.getMenuInflater().inflate(R.menu.itemselect_search, menu);
SearchManager searchManager = (SearchManager) mActivity
        .getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.item_search)
        .getActionView();
searchView.setSearchableInfo(searchManager.getSearchableInfo(mActivity
        .getComponentName()));
searchView.setOnQueryTextListener(this);
searchView.setOnSuggestionListener(this);

我的onQueryTextListener:

public boolean onQueryTextSubmit(String query) {
    return true;
}
public boolean onQueryTextChange(String newText) {
    Log.i("TextChange", "=(" + newText + ")");
    if (newText == null || newText.isEmpty()) {
        //Empty the suggestions instead of showing all items...
        if (null != mSuggestionAdapter)
            mSuggestionAdapter.swapCursor(null);
    } else {
        currentSearchQuery = newText;
        mActivity.getSupportLoaderManager().restartLoader(1, null, this);
    }
    return true;
}

我的onCreateLoader:

public Loader<Cursor> onCreateLoader(int id, Bundle arg1) {
    CursorLoader mCursorLoader = null;
    switch (id) {
    //Other Loader IDs...
    case 1:
        Log.i("OnCreateLoader", "Loader created: " + id);
        mCursorLoader = new CursorLoader(mActivity,
                MyContentProvider.URI,
                SQLiteRomDataSource.allColumns,
                mSelection,
                mSelectionArgs, null);
        break;
    }
    return mCursorLoader;
}

我的onLoadFinished:

public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    switch (loader.getId()) {
    //Other Loader IDs...
    case 1:
        Log.i("OnLoadFinished",
                "Loader " + loader.getId() + ", " + cursor.getCount()
                        + " results");
        if (null == mSuggestionAdapter) {
            Log.i("OnLoadFinished","Creating adapter");
            mSuggestionAdapter = new SuggestionsCursorAdapter(
                    mActivity, cursor, 0);
        }
        if (searchView.getSuggestionsAdapter() != mSuggestionAdapter){
            Log.i("OnLoadFinished","Binding adapter to searchview");
            searchView.setSuggestionsAdapter(mSuggestionAdapter);
        }
        mSuggestionAdapter.swapCursor(cursor);
        Log.i("OnLoadFinished","Swapping cursor...");
        break;
    }
}

最后是我的onLoaderReset:

@Override
public void onLoaderReset(Loader<Cursor> loader) {
    switch (loader.getId()) {
    //Other Loader IDs...
    case 1:
        mSuggestionAdapter.swapCursor(null);
        break;
    }
}

Answer 1

经过进一步测试，我决定不使用 LoaderManager 并在我的 onQueryTextChange 方法中执行所有操作。这两个问题似乎都已解决。

public boolean onQueryTextChange(String newText) {
    Log.i("TextChange", "=(" + newText + ")");
    if (newText == null || newText.isEmpty()) {
        if (null != mSuggestionAdapter)
            mSuggestionAdapter.swapCursor(null);
    } else {
        Cursor mCur = mActivity.getContentResolver().query(
                MyContentProvider.URI,
                DataSource.allColumns,
                mSelection, mSelectionArgs, null);
        if(null == mRomSuggestionAdapter){
            mRomSuggestionAdapter = new SuggestionsCursorAdapter(mActivity,mCur,0);
            searchView.setSuggestionsAdapter(mRomSuggestionAdapter);
        }
        if (null != mSuggestionAdapter)
            mSuggestionAdapter.swapCursor(mCur);
    }
    return true;
}