Spinner的NullPointerException问题-->未解决(初步怀疑是Spinner本身的问题)_spinner android:entries="", nullpointerexception-优快云博客

本文链接：https://blog.youkuaiyun.com/nowlf_android/article/details/41250407

本文详细解析了 Android 中 Spinner 控件出现 NullPointerException 的原因，并提供了解决方案，即在 DialogPopup 的 dismiss 方法中增加对 mPopup 是否为空的判断。

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java.lang.NullPointerException
// at android.widget.Spinner$DialogPopup.dismiss(Spinner.java:907)
// at android.widget.Spinner$DialogPopup.onClick(Spinner.java:945)
// at com.android.internal.app.AlertController$AlertParams$3.onItemClick(Al
ertController.java:941)
// at android.widget.AdapterView.performItemClick(AdapterView.java:298)
// at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
// at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788)
// at android.widget.AbsListView$1.run(AbsListView.java:3463)
// at android.widget.AbsListView.onDetachedFromWindow(AbsListView.java:2670
)
// at android.view.View.dispatchDetachedFromWindow(View.java:12160)
// at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2570
)
// at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2568
)
// at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2568
)
// at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2568
)
// at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2568
)
// at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:2568
)
// at android.view.ViewRootImpl.dispatchDetachedFromWindow(ViewRootImpl.jav
a:2820)
// at android.view.ViewRootImpl.doDie(ViewRootImpl.java:5164)
// at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.
java:3148)
// at android.os.Handler.dispatchMessage(Handler.java:99)
// at android.os.Looper.loop(Looper.java:137)
// at android.app.ActivityThread.main(ActivityThread.java:5136)
// at java.lang.reflect.Method.invokeNative(Native Method)
// at java.lang.reflect.Method.invoke(Method.java:525)
// at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit
.java:739)
// at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)

// at dalvik.system.NativeStart.main(Native Method)

在Spinner源代码中：

DialogPopup的dismiss()方法中加上判断mPopup是否为空