TimePicker点击改变时间时java.lang.NullPointerException异常

listview 跟TimePicker使用时，点击

TimePicker的向上和向下方向键修改时间是，会报错，

06-23 00:58:01.255: E/AndroidRuntime(8123): FATAL EXCEPTION: main06-23 00:58:01.255: E/AndroidRuntime(8123): java.lang.NullPointerException06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.TimePicker.updateInputState(TimePicker.java:598)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.TimePicker.callUpdateInputState(TimePicker.java:60)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.TimePicker$OnMinuteChangeListener.onValueChange(TimePicker.java:69)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.NumberPicker.notifyChange(NumberPicker.java:1750)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.NumberPicker.setValueInternal(NumberPicker.java:1536)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.NumberPicker.changeValueByOne(NumberPicker.java:1564)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.NumberPicker.access$200(NumberPicker.java:88)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.widget.NumberPicker$2.onClick(NumberPicker.java:606)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.view.View.performClick(View.java:4113)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.view.View$PerformClick.run(View.java:17006)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.os.Handler.handleCallback(Handler.java:615)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.os.Handler.dispatchMessage(Handler.java:92)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.os.Looper.loop(Looper.java:137)06-23 00:58:01.255: E/AndroidRuntime(8123): at android.app.ActivityThread.main(ActivityThread.java:4797)06-23 00:58:01.255: E/AndroidRuntime(8123): at java.lang.reflect.Method.invokeNative(Native Method)06-23 00:58:01.255: E/AndroidRuntime(8123): at java.lang.reflect.Method.invoke(Method.java:511)06-23 00:58:01.255: E/AndroidRuntime(8123): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)06-23 00:58:01.255: E/AndroidRuntime(8123): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)06-23 00:58:01.255: E/AndroidRuntime(8123): at dalvik.system.NativeStart.main(Native Method)

请知道原因或有解决办法的朋友指教，这里先谢过了

经实验，是因为布局设计引起的错误：

原布局：

<ListViewandroid:id="@+id/hint_select_list"android:layout_width="match_parent"android:layout_height="wrap_content"android:cacheColorHint="@android:color/transparent"android:divider="#e5e5e5"android:dividerHeight="1dip"android:orientation="vertical" /><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="10dip"android:layout_marginBottom="10dip"android:orientation="vertical"><TextView android:id="@+id/dateDisplay"android:layout_width="wrap_content"android:layout_height="wrap_content"android:paddingLeft="4dip"android:text=""/><TimePicker android:id="@+id/timePicker"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"/></LinearLayout>修改后布局： <LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_marginTop="10dip"android:layout_marginBottom="10dip"android:orientation="vertical"><TextView android:id="@+id/dateDisplay"android:layout_width="wrap_content"android:layout_height="wrap_content"android:paddingLeft="4dip"android:text=""/><TimePicker android:id="@+id/timePicker"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"/></LinearLayout><ListViewandroid:id="@+id/hint_select_list"android:layout_width="match_parent"android:layout_height="wrap_content"android:cacheColorHint="@android:color/transparent"android:divider="#e5e5e5"android:dividerHeight="1dip"android:orientation="vertical" />修改后，TimePicker可以正常修改时间，目前还没搞清楚什么原因，请朋友们帮忙指正啊

，教育人的,激励人的,安慰人不开心的. 或者是 诗词 诗经里的..