android - 按下按钮加号或减号时TimePicker空指针异常

Question

仅当我尝试强制布局显示带有递增和递减按钮的选择器时才会出现此问题。因此，当我在 fragment 中使用此代码并按“+”或“-”时，应用程序崩溃了:

final Context contextThemeWrapper = new ContextThemeWrapper(getActivity(), R.style.cust_dialog); 
LayoutInflater localInflater = inflater.cloneInContext(contextThemeWrapper);

如果我注释上面的代码行，一切正常。
这是客户对话:

<style name="cust_dialog" parent="@android:style/Theme.NoTitleBar.Fullscreen"></style>

这是堆栈跟踪:

09-06 01:15:35.947: E/AndroidRuntime(19858): FATAL EXCEPTION: main
09-06 01:15:35.947: E/AndroidRuntime(19858): java.lang.NullPointerException
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.TimePicker.updateInputState(TimePicker.java:580)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.TimePicker.access$000(TimePicker.java:56)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.TimePicker$2.onValueChange(TimePicker.java:150)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.NumberPicker.notifyChange(NumberPicker.java:1776)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.NumberPicker.setValueInternal(NumberPicker.java:1562)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.NumberPicker.changeValueByOne(NumberPicker.java:1592)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.NumberPicker.access$200(NumberPicker.java:90)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.widget.NumberPicker$1.onClick(NumberPicker.java:633)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.view.View.performClick(View.java:4202)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.view.View$PerformClick.run(View.java:17340)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.os.Handler.handleCallback(Handler.java:725)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.os.Looper.loop(Looper.java:137)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at android.app.ActivityThread.main(ActivityThread.java:5039)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at java.lang.reflect.Method.invokeNative(Native Method)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at java.lang.reflect.Method.invoke(Method.java:511)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-06 01:15:35.947: E/AndroidRuntime(19858):    at dalvik.system.NativeStart.main(Native Method)

我该如何解决这个问题？

Answer 1

在时间选择器中添加标签。它对我有用:

<TimePicker android:id="@+id/timePicker"     
     android:layout_width="wrap_content"    
     android:layout_height="wrap_content"    
     android:layout_gravity="center_horizontal">  
 <requestFocus />  
</TimePicker>  

引用:http://blog.csdn.net/ljb_blog/article/details/9153435