我在點擊導航抽屜中的選項菜單時出現此錯誤？

-3

java.lang.NullPointerException 
         at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:89) 
         at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1006) 
         at android.support.v4.view.ViewPager.populate(ViewPager.java:1154) 
         at android.support.v4.view.ViewPager.populate(ViewPager.java:1088) 
         at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1614) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:700) 
         at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) 
         at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1364) 
         at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:765) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:700) 
         at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:767) 
         at android.view.View.measure(View.java:15848) 
         at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1085) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
         at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
         at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
         at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
         at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
         at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5012) 
         at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
         at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2189) 
         at android.view.View.measure(View.java:15848) 
         at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1905) 
         at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1104) 
         at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1284) 
         at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
         at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
         at android.view.Choreographer$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$FrameDisplayEventReceiver.run(Choreographer.java:735) 
         at android.os.Handler.handleCallback(Handler.java:730) 
         at android.os.Handler.dispatchMessage(Handler.java:92) 
         at android.os.Looper.loop(Looper.java:137) 
         at android.app.ActivityThread.main(ActivityThread.java:5103) 
         at java.lang.reflect.Method.invokeNative(Native Method) 
         at java.lang.reflect.Method.invoke(Method.java:525) 
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

終止應用程序。我在點擊導航抽屜中的選項菜單時出現此錯誤？

來源

2016-10-14 Aliya

提供'XML'和'Java'代碼來回答 – xAqweRx

asd fragmentPagerAdapter代碼。在這個類中有一個空引用 –

ngl我們可以做的只是你的logcat lmao – Razgriz

空引用異常總是指示某些內容爲空。

爲了避免使用

if(yourObject != null) 
{ 
// put code you want to execute here 
}

爲了更好地回答共享代碼和我們在一起。

來源

2016-10-14 08:54:36 Felix

我在點擊導航抽屜中的選項菜單時出現此錯誤？

回答

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