java - Android 无法解析构造函数 ArrayAdapter

Question

我知道这个问题之前已经被问过多次，但没有一个解决方案对我有用。这是我的代码:

public class reminderDAO extends dbManager{



public reminderDAO(Context context) {
    super(context);
}


// Adding new reminder
public void addReminder(Reminder reminder) {
    //dbm.gettingWritable(values);
    SQLiteDatabase db = getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(getKEY_DATE(), reminder.getReminderDate());
    values.put(getKEY_TITLE(), reminder.getReminderTitle());
    values.put(getKEY_DESC(), reminder.getReminderDescription());
    values.put(getKEY_TIME(), reminder.getReminderTime());


    // Inserting Row
    db.insert(getDATABASE_TABLE(), null, values);
    db.close(); // Closing database connection
}

public List<Reminder> getAllReminders(ListView lv) {



    ArrayList<Reminder> reminderList = new ArrayList<Reminder>();
    // Select All Query
    String selectQuery = "SELECT  * FROM " + getDATABASE_TABLE();

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



    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            Reminder r = new Reminder();

            r.setReminderDate(cursor.getString(0));
            r.setReminderTitle(cursor.getString(1));
            r.setReminderDescription(cursor.getString(2));
            r.setReminderTime(cursor.getString(3));
            // Adding reminder to list
            reminderList.add(r);


        } while (cursor.moveToNext());
    }
    ArrayAdapter<Reminder> arrayAdapter = new ArrayAdapter<Reminder>(
            this,
            android.R.layout.simple_list_item_1,
            reminderList );

    lv.setAdapter(arrayAdapter);
    // return reminder list
    return reminderList;
}
}

我感觉这与 arrayAdapter 中的“this”有关。我试过 getActivity()、this.getActivity()、reminderDAO.this.getActivity()、MainActivity.this 和 reminderDAO.this。

谁有解决办法？

Answer 1

在您的类中创建一个上下文变量。并从构造函数参数中分配它。

private Context context;

public reminderDAO(Context context) {
    this.context = context;
    super(context);
}

然后使用这个变量传递给ArrayAdapter

ArrayAdapter<Reminder> arrayAdapter = new ArrayAdapter<Reminder>(
            this.context,
            android.R.layout.simple_list_item_1,
            reminderList );