“找不到符号方法 setOnDismissListener(<anonymous OnDismissListener>)”答案

【问题标题】："cannot find symbol method setOnDismissListener(<anonymous OnDismissListener>)"“找不到符号方法 setOnDismissListener(<anonymous OnDismissListener>)”
【发布时间】：2017-12-02 04:08:00
【问题描述】：

所以，我尝试在对话框中设置OnDismissListener。

Datepicker dialog = new Datepicker(v);
dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
                    @Override
                    public void onDismiss(DialogInterface Dialog) {
                        mGoogleMap.clear();
                        setMap(mGoogleMap);
                    }

                });

但它说

"Cannot resolve method 'setOnDismissListener(anonymous android.content.DialogInterface.OnDismissListener)'"

Datepicker 类扩展了DialogFragment，所以它应该有setOnDismissListener 方法？

我出于某种原因导入了android.content.DialogInterface'. Is it confused on thenew DialogInterface.onDismissListener()`？

编辑：有人要求提供一些 Datepicker 代码。所以这里是构造函数和东西。如果您还需要什么，请告诉我。

public class Datepicker extends DialogFragment implements DatePickerDialog.OnDateSetListener {
    EditText txtDate;
    String strdate;
    public Datepicker(View v){
        txtDate = (EditText)v;
    }
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);
        SimpleDateFormat simpleformat = new SimpleDateFormat("MM/dd/yyyy");
        strdate = simpleformat.format(c.getTime());
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }
}

【问题讨论】：

Datepicker 类扩展了DialogFragment，所以它应该有setOnDismissListener 方法？ - 你是从哪里以及如何得出这个声明的？在DialogFragment中没有这种方法叫setOnDismissListener
嗯。也许这就是我出错的地方？ Android API 说“注意：DialogFragment 拥有 Dialog.setOnCancelListener 和 Dialog.setOnDismissListener 回调。您不能自己设置它们。要了解这些事件，请覆盖 onCancel(DialogInterface) 和 onDismiss(DialogInterface)。”但我不知道那是什么意思。我能做什么？
API 说得很清楚，你不应该这样做 setOnCancelListener 或 setOnDismissListener ，只需在你的类中直接覆盖 onCancel 或 onDismiss 扩展 DialogFragment （并做你想要在对话框被取消/关闭时做）

标签： java android dialog listener dialogfragment

【解决方案1】：

你必须借助界面来解决这个问题

public class Main3Activity extends AppCompatActivity implements DatePickerListener{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

.........

     //Initialise or create your dialog like this
      DatePicker dialog = new DatePicker(v,this);
}

@Override
    public void onDatePickerDismissed() {
         //Here You receive the dialog dissmiss listner
                        mGoogleMap.clear();
                        setMap(mGoogleMap);
    }
}

创建一个类似的接口类

public interface DatePickerListener {

    public void onDatePickerDismissed();
}

像这样改变你的对话框选择器

@SuppressLint("ValidFragment")
public class DatePicker extends DialogFragment implements DatePickerDialog.OnDateSetListener {
    EditText txtDate;
    String strdate;
    DatePickerListener datePickerListener;
    @SuppressLint("ValidFragment")
    public DatePicker(View v, DatePickerListener _datePickerListener){
        txtDate = (EditText)v;
        this.datePickerListener = _datePickerListener;
    }

    public DatePicker() {

    }

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);
        SimpleDateFormat simpleformat = new SimpleDateFormat("MM/dd/yyyy");
        strdate = simpleformat.format(c.getTime());
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    @Override
    public void onDateSet(android.widget.DatePicker datePicker, int i, int i1, int i2) {

    }

    @Override
    public void onDismiss(DialogInterface dialog) {
        datePickerListener.onDatePickerDismissed();
        super.onDismiss(dialog);
    }
}

希望对你有帮助:)

【讨论】：