Question

我正在尝试使用单例获取DialogFragment并获得Dialog，但是当尝试获取此对象时，您的属性不会得到此内容。

我希望获得Dialog的视图，但这不会访问布局的ID，这是我的DialogFragment：

 public static class newTaskFragment extends DialogFragment {




        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            // Get the layout inflater
            LayoutInflater inflater = getActivity().getLayoutInflater();





            // Inflate and set the layout for the dialog
            // Pass null as the parent view because its going in the dialog layout
            builder.setView(inflater.inflate(R.layout.new_task_dialog, null))
                    // Add action buttons
                    .setPositiveButton(R.string.create_task, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int id) {

                        }
                    })
                    .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            newTaskFragment.this.getDialog().cancel();
                        }
                    });



            return builder.create();
        }

        @Override
        public void onViewCreated(View view, Bundle savedInstanceState) {
            DialogSingleton.getInstance().setDialog(this.getDialog());
            super.onViewCreated(view, savedInstanceState);
        }
    }

这是我的单身人士：

DialogSingleton.java

public class DialogSingleton {

        private static DialogSingleton Instance;

        private Dialog mDialog;

        private DialogSingleton(){
            mDialog = new Dialog(MainActivity.ma.getApplicationContext());
        }

        public static DialogSingleton getInstance(){
            if(Instance == null)
            {
                Instance = new DialogSingleton();
            }
            return Instance;
        }

        public Dialog getDialog(){
            return this.mDialog;
        }

        public void setDialog(Dialog value){
            mDialog = value;
        }
    }

但是当我尝试访问该对象时，但是没有访问视图Button，当我尝试访问Singleton时代码如何：

   public static class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            // Use the current time as the default values for the picker
            final Calendar c = Calendar.getInstance();
            int hour = c.get(Calendar.HOUR_OF_DAY);
            int minute = c.get(Calendar.MINUTE);

            // Create a new instance of TimePickerDialog and return it
            return new TimePickerDialog(getActivity(), this, hour, minute,
                    DateFormat.is24HourFormat(getActivity()));
        }

        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            Time time = new Time();
            time.hour = hourOfDay;
            time.minute = minute;



            /*Fragment fragment = getFragmentManager().findFragmentByTag("newTask");
             View viewv = fragment.getView();*/



            Log.d("TaskManager", "A classe é" + DialogSingleton.getInstance().getDialog());

            Button button = (Button) DialogSingleton.getInstance().getDialog().findViewById(R.id.choice_data);
            if(button != null) button.setText("ss");



        }
    }

总是按钮返回null，现在请有人，有什么不对，非常感谢。

更新

new_task_dialog.xml

..
<Button
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:text="@string/pick_date"
        android:onClick="showDatePickerDialog"
        android:id="@+id/choice_data"
        />
    <Button
            android:layout_width="150dp"
            android:layout_height="wrap_content"
            android:text="@string/choice_hour"
            android:onClick="showTimePickerDialog"
            android:id="@+id/choice_hour"
    />
..

Answer 1

在布局文件中定义一个Button，并将其ID指定为“choice_data”。它应该像

<Button
     android:id="@+id/choice_data"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="@string/my_button_text"/>

findViewById(R.id.data_choice)在无法找到ID为

的元素时返回 null

Answer 2

您需要设置对话框的视图。目前，您的对话框在布局中找不到指定的按钮。因此，您需要先提供布局，然后按住按钮。

public class DialogSingleton {       
   // set the view
   public void setView(int layoutId){
   mDialog.setContentView(layoutId);
   }
}

首先将自定义布局设置为对话框，然后从该视图中获取按钮。

编辑：

解决方案1

public static class TimePickerFragment extends newTaskFragment implements TimePickerDialog.OnTimeSetListener {...}

解决方案2

public static class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
// some code here

Dialog d = DialogSingleton.getInstance().getDialog();
d.setContentView(R.layout.new_task_dialog);
Button b = (Button)d.findViewById(R.id.choice_data);

Singleton不能正确返回我的Object

2 个答案: