Question

我正在我的应用中处理本地搜索建议。使用与Searchable Activity良好交互的Search Widget创建搜索界面。

当我修改代码以显示建议时，问题就开始了。 Content Provide子类创建为：

public class SearchSuggester extends ContentProvider {
    @Override
    public boolean onCreate() {
        return false;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        if(selectionArgs!=null && selectionArgs.length>0 && selectionArgs[0]!=null)
        {
            // do Something to return cursor
            return new SQLiteIntegrator(getContext()).getSearchMatch(selectionArgs[0]);
        }
        else {
            return null;
        }
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return 0;
    }
}

SQLiteIntegrator是一个与数据库交互的类。

public class SQLiteIntegrator extends SQLiteOpenHelper {
    Context mContext;
    public SQLiteIntegrator(Context applicationContext)
    {
        super(applicationContext, "SuggestionDB.db", null, 2);
        this.mContext=applicationContext;
    }
    public Cursor getSearchMatch(String catName)
    {
        SQLiteDatabase database=getReadableDatabase();
        String pluralSearch="UPPER(cat_name) like '% "+catName.toUpperCase()+"s %' OR UPPER(cat_name) like '"+catName.toUpperCase()+"s %' OR UPPER(cat_name) like '% "+catName.toUpperCase()+"s' OR UPPER(cat_name)='"+catName.toUpperCase()+"s'";
        String searchQuery="Select * from CatSuggestion where UPPER(cat_name) like '% "+catName.toUpperCase()+" %' OR UPPER(cat_name) like '"+catName.toUpperCase()+" %' OR UPPER(cat_name) like '% "+catName.toUpperCase()+"' OR UPPER(cat_name)='"+catName.toUpperCase()+"' OR "+pluralSearch;
        return database.rawQuery(searchQuery,null);
    }

该程序抛出错误：

 E/SuggestionsAdapter﹕ error changing cursor and caching columns
    java.lang.IllegalArgumentException: column '_id' does not exist
            at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:303)
            at android.database.CursorWrapper.getColumnIndexOrThrow(CursorWrapper.java:78)
            at android.widget.CursorAdapter.swapCursor(CursorAdapter.java:342)
            at android.widget.CursorAdapter.changeCursor(CursorAdapter.java:313)
            at android.widget.SuggestionsAdapter.changeCursor(SuggestionsAdapter.java:264)
            at android.widget.CursorFilter.publishResults(CursorFilter.java:67)
            at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5257)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

我正在使用数据库与表CatSuggestion有三个字段cat_id，cat_parentid，cat_name。我没有使用SQLQueryBuilder setProjection，因为我不知道如何为现有的表。

请帮忙。

搜索建议投掷错误

0 个答案: