Spinner中的奇怪的NullPointerException

由於Android 4.4 KitKat，我在我的應用程序中有奇怪的崩潰。這似乎與微調有關。這堆棧跟蹤我收到︰Spinner中的奇怪的NullPointerException

java.lang.NullPointerException 
    at android.widget.TextView.makeNewLayout(TextView.java:6124) 
    at android.widget.TextView.onMeasure(TextView.java:6400) 
    at android.view.View.measure(View.java:16458) 
    at android.widget.Spinner.setUpChild(Spinner.java:632) 
    at android.widget.Spinner.makeView(Spinner.java:595) 
    at android.widget.Spinner.getBaseline(Spinner.java:431) 
    at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1089) 
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:590) 
    at android.view.View.measure(View.java:16458) 
    at com.android.internal.widget.ActionBarView.onMeasure(ActionBarView.java:1011) 
    at android.view.View.measure(View.java:16458) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    at com.android.internal.widget.ActionBarContainer.onMeasure(ActionBarContainer.java:271) 
    at android.view.View.measure(View.java:16458) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
    at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:254) 
    at android.view.View.measure(View.java:16458) 
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2289) 
    at android.view.View.measure(View.java:16458) 
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1914) 
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1111) 
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1293) 
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998) 
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5582) 
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
    at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
    at android.view.Choreographer.doFrame(Choreographer.java:532) 
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
    at android.os.Handler.handleCallback(Handler.java:733) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:137) 
    at android.app.ActivityThread.main(ActivityThread.java:4998) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 
    at dalvik.system.NativeStart.main(Native Method)

我在操作欄中有微調導航，我認爲它與它有關。我正在使用ABS.I追蹤錯誤以獲取我的微調陣列適配器的View方法。這裏是我的getView方法：

@Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     if (LoginUtils.isLogged()) { 
      items[Properties.NAVIG_ITEM_MY_PROFILE] = LoginUtils.getTextForAdapter(); 
     } else { 
      items[Properties.NAVIG_ITEM_MY_PROFILE] = context.getString(R.string.userProfile); 
     } 
     View view = convertView; 
     if (view == null) { 
      LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      view = vi.inflate(R.layout.ab_spinner_item, null); 
     } 
     String text = items[position]; 
     TextView menu = (TextView) view.findViewById(android.R.id.text1); 
     if (title == null) { 
      menu.setText(text); 
     } else { 
      menu.setText(title); 
     } 
     return view; 
    }

如果我評論這行：

//if (title == null) { 
     menu.setText(text); 
// } else { 
//  menu.setText(title); 
// }

問題就消失了。有人有什麼主意嗎？

來源

2013-11-24 Billda

您是否嘗試調試您的代碼並檢查哪個變量爲空？ –

是的，我調試，沒有變量爲空 – Billda

正如Peterdk描述的here。你不需要刪除

機器人：ellipsize = 「跑馬燈」

他建議使用：

inflater.inflate（android.R.layout.simple_spinner_item，NULL）;// WRONG inflater.inflate（android.R.layout.simple_spinner_item，父母，假）; // GOOD

這解決了我的問題。我猜Android 4.4正試圖嚴格充氣佈局

來源

2013-12-09 07:07:53

什麼應該是這裏的父param理想和一般？ –

所以我在TextView類的makeNewLayout方法中檢查該行，並發現此異常正在發生在這一行final int height = mLayoutParams.height;佈局參數可能爲空......並且此行在塊中處理橢圓化長文本..所以我刪除了textView屬性在xml android:ellipsize="marquee"然後問題確實消失..奇怪的奇怪

來源

2013-11-24 17:08:29 Billda

謝謝。我通過從所有佈局中刪除android：ellipsize來消除崩潰。

來源

2013-11-27 18:15:18 Satish

Spinner中的奇怪的NullPointerException

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