Question

我试图用从其他函数获取的 ArrayListView 以一个 ArrayList 来弹出动态创建的 。我正在获取错误 “The buildor ArrayAdapter< String> (showRecords, ListView, ArrayList < String>) 定义不清的“ 。以下是我为 Listactivity 的代码 :



public class ShowRecords extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);

        DatabaseHandler db = new DatabaseHandler(this);
        ArrayList<String> records = db.getRecords();

        ListView lv = new ListView(this);
        this.setListAdapter(new ArrayAdapter<String>(this, lv, records));
    } 

}


s 这里我对  getRecords ()  函数的代码 :

public ArrayList<String> getRecords() {
    ArrayList<String> recordList = new ArrayList<String>();
    String selectQuery = "SELECT millis FROM records ORDER BY CAST(millis as SIGNED) DESC LIMIT 10";

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    if (cursor != null) {
        if (cursor.moveToFirst()) {
            do {
                recordList.add(cursor.getString(0));
            } while (cursor.moveToNext());
        }
    }

    return recordList;
}


我该如何解决这个问题?

Answer 1

由于您正在使用 ListAffactivity, 您不需要声明列表视图。

试试这个,这应该有用!

public class ShowRecords extends ListActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    LinearLayout ll = new LinearLayout(this);
    ll.setOrientation(LinearLayout.VERTICAL);

    DatabaseHandler db = new DatabaseHandler(this);
    ArrayList<String> records = db.getRecords();
    setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, records));
} 

}

Answer 2

此处列出可用的构造器列表 :

[Public Method] [Constructor] ArrayAdapter(Context, int) : void
[Public Method] [Constructor] ArrayAdapter(Context, int, int) : void
[Public Method] [Constructor] ArrayAdapter(Context, int, Object[]) : void
[Public Method] [Constructor] ArrayAdapter(Context, int, List) : void
[Public Method] [Constructor] ArrayAdapter(Context, int, int, List) : void
[Public Method] [Constructor] ArrayAdapter(Context, int, int, Object[]) : void

你当然想用这个:

[Public Method] [Constructor] ArrayAdapter(Context, int, Object[]) : void

意思是:

this.setListAdapter(new ArrayAdapter<String>(this, R.id.whateveridyouchoose, records));

友情链接