如何构建自定义搜索建议的建议表？

Question

我在我的应用程序中实现了自定义搜索建议。我找到了有关添加自定义建议的开发者文档。 http://developer.android.com/guide/topics/search/adding-custom-suggestions.html

到目前为止，我已经创建了像这样的searchable.xml。

<?xml version="1.0" encoding="utf-8"?> 
<searchable xmlns:android="http://schemas.android.com/apk/res/android" 
    android:label="@string/app_label" 
    android:hint="@string/search_hint" 
    android:searchSuggestAuthority="com.example.MyCustomSuggestionProvider"> 
</searchable> 

我现在正在实现MyCustomSuggestionProvider，但是我发现很难构建建议表。如何使用MatrixCursor构建建议表而不实际构建文档中提到的表？请提供代码以便于理解。

Answer 1

您可以考虑使用SQLiteQueryBuilder和ProjectionMap来实现相同的结果。这里是代码片段供您参考。

private static final HashMap<String, String> PROJECTION_MAP = new HashMap<String, String>(); 
static { 
    PROJECTION_MAP.put("_id", Symbol.COL_ID); 
    PROJECTION_MAP.put(SearchManager.SUGGEST_COLUMN_TEXT_1, "col1 AS " + SearchManager.SUGGEST_COLUMN_TEXT_1); 
    PROJECTION_MAP.put(SearchManager.SUGGEST_COLUMN_TEXT_2, "col2 AS " + SearchManager.SUGGEST_COLUMN_TEXT_2); 
    PROJECTION_MAP.put(SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID, "_id AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA_ID); 
} 

@Override 
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { 
    SQLiteQueryBuilder builder = new SQLiteQueryBuilder(); 
    builder.setTables("table"); 
    builder.setProjectionMap(PROJECTION_MAP); 
    return builder.query(db, projection, selection, selectionArgs, null, null, sortOrder); 
}