NumberPicker不能在DialogFragment中工作

Question

我正在學習android編程的基礎知識，並且在使用NumberPicker時遇到了一些麻煩。

我接近我想要的，打開對話框並顯示小時和分鐘數字選取器，但它們沒有上下滾動的數字。我也不能用彈出的鍵盤編輯數字。我嘗試添加一個onValueChange偵聽器，但是當我使用鍵盤時它沒有生成任何事件。

任何人都可以提供有關如何解決這個問題的建議嗎？到目前爲止，我注意到我在某些活動或片段中嘗試使用該特定類中不支持的部件時會遇到很多問題。

下面是相關的代碼的片段和圖片：

我有一個類ClockActivity有兩個按鈕：

... 
public class ClockActivity extends ActionBarActivity { 

... 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_clock); 

    // Define gui objects 
    ... 
    mWorkForTime   = (Button)findViewById(R.id.work_for_time); 
    mBreakForTime   = (Button)findViewById(R.id.break_for_time); 

    // Add listeners for the work for/break for buttons 
    mWorkForTime.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      // Bring up the picker fragment 
      DialogFragment newFragment = TimePickerFragment.newInstance(R.string.work_title); 
      newFragment.show(getSupportFragmentManager(), "WorkTimePicker"); 
     } 
    }); 
    mBreakForTime.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      // Bring up the picker fragment 
      DialogFragment newFragment = TimePickerFragment.newInstance(R.string.break_title); 
      newFragment.show(getSupportFragmentManager(), "BreakTimePicker"); 
     } 
    }); 
    ... 

的TimePickerFragment類擴展DialogFragment：

public class TimePickerFragment extends DialogFragment { 
    // Setup the time pickers 
    private NumberPicker mHourPicker; 
    private NumberPicker mMinutePicker; 

    public static TimePickerFragment newInstance(int title) { 
     TimePickerFragment fragment = new TimePickerFragment(); 
     Bundle args = new Bundle(); 
     args.putInt("title", title); 
     fragment.setArguments(args); 
     return fragment; 
    } 

    @Override 
    public Dialog onCreateDialog(Bundle savedInstanceState) { 
     super.onCreateDialog(savedInstanceState); 

     int title = getArguments().getInt("title"); 

     LayoutInflater inflater = getActivity().getLayoutInflater(); 

     View view = (View)inflater.inflate(R.layout.activity_time_picker, null); 

     // Initialize the pickers 
     mHourPicker = (NumberPicker)view.findViewById(R.id.hours_picker); 
     mMinutePicker = (NumberPicker)view.findViewById(R.id.minutes_picker); 
     mHourPicker.setMinValue(0); 
     mMinutePicker.setMinValue(0); 
     mHourPicker.setMaxValue(24); 
     mMinutePicker.setMaxValue(59); 


     Dialog alertDialog = new AlertDialog.Builder(getActivity()) 
       .setTitle(title) 
       .setView(inflater.inflate(R.layout.activity_time_picker, null)) 
       .setNegativeButton(R.string.negate, 
         new DialogInterface.OnClickListener() { 
          @Override 
          public void onClick(DialogInterface dialog, int which) { 
           ((ClockActivity) getActivity()).doNegativeTimeDialogClick(); 
          } 
         }) 
       .setPositiveButton(R.string.confirm, 
         new DialogInterface.OnClickListener() { 
          @Override 
          public void onClick(DialogInterface dialog, int which) { 
           ((ClockActivity) getActivity()).doPositiveTimeDialogClick(); 
          } 
         }) 
       .create(); 
     return alertDialog; 
    } 
} 

以下是DialogFragment視圖的XML，位於

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <LinearLayout 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content"> 

      <TextView 
       android:layout_width="0dp" 
       android:layout_weight="1" 
       android:layout_height="wrap_content" 
       android:gravity="center" 
       android:text="@string/hours" 
       android:textSize="24sp" 
       android:textStyle="bold"/> 

      <TextView 
       android:layout_width="0dp" 
       android:layout_weight="1" 
       android:layout_height="wrap_content" 
       android:gravity="center" 
       android:text="@string/minutes" 
       android:textSize="24sp" 
       android:textStyle="bold"/> 

     </LinearLayout> 

     <LinearLayout 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content"> 

      <NumberPicker 
       android:id="@+id/hours_picker" 
       android:layout_width="0dp" 
       android:layout_weight="1" 
       android:layout_height="wrap_content"/> 

      <NumberPicker 
       android:id="@+id/minutes_picker" 
       android:layout_width="0dp" 
       android:layout_weight="1" 
       android:layout_height="wrap_content"/> 

     </LinearLayout> 
    </LinearLayout> 

這是當前操作的圖像：

http://i.imgur.com/4UiSLcn.png

以下是我在尋找有：

http://www.i-programmer.info/images/stories/Core/Android/Pickers/ten.gif

下面是一些輸出我在控制檯上看到當我嘗試用軟鍵盤編輯NumberPicker時：

01-02 16:10:46.559 18438-18438/com.example.android.worktimer W/IInputConnectionWrapper﹕ beginBatchEdit on inactive InputConnection 
01-02 16:10:46.569 18438-18438/com.example.android.worktimer W/IInputConnectionWrapper﹕ endBatchEdit on inactive InputConnection 

Answer 1

您必須爲選擇器提供您想要選擇的數組。

String[] myStringArray = new String[]{"a","b","c"}; 
    mMinutePicker.setMinValue(0); 
    mMinutePicker.setMaxValue(myStringArray.length - 1); 
    mMinutePicker.setDisplayedValues(myStringArray); 

，並更改

Dialog alertDialog = new AlertDialog.Builder(getActivity()) .setTitle(title) .setView(inflater.inflate(R.layout.activity_time_picker, null)) 

到

Dialog alertDialog = new AlertDialog.Builder(getActivity()).setTitle(title).setView(view) 

您再次膨脹的看法。