从数据库填充ListView

Question

我的数据库中的ListView上没有显示任何内容。 继承我的代码。 这来自收集数据的数据库连接。

public Cursor getData(String hlth_cond) {
    SQLiteDatabase db = this.getWritableDatabase();
    String StringQuery = "";
    if(hlth_cond == "Highblood"){
        StringQuery = "SELECT RECIPE_NAME FROM TBL_NAME";
    }
    else if (hlth_cond == "Arthritis"){
        StringQuery = "SELECT RECIPE_NAME FROM TBL_NAME_Arth";
    }
    else if (hlth_cond == "Diabetic"){
        StringQuery = "SELECT RECIPE_NAME FROM TBL_NAME_Dia";
    }
    Cursor res;
    return res = db.rawQuery(StringQuery,null);

}

这段代码是我的主要活动

public void showList(){
    String toPass="";
    if(Cb_Ar.isChecked()){
        toPass = Cb_Ar.toString();
    }else if (Cb_Db.isChecked()){
        toPass = Cb_Db.toString();
    }else if (Cb_Hb.isChecked()){
        toPass = Cb_Hb.toString();
    }
    Cursor cursor = myDb.getData(toPass);
    String[] fromDb = new String[] {DatabaseHelper.RECIPE_NAME};
    int[] toView = new int[] {R.id.textViewMenuSuggest};
    SimpleCursorAdapter myCursor;
    myCursor = new SimpleCursorAdapter(getBaseContext(),R.layout.menushow,cursor,fromDb,toView,0);
    ListView myList = (ListView) findViewById(R.id.listView);
    myList.setAdapter(myCursor);

}

为什么它没有显示在我的ListView上会出错？