ViewPager FragmentPagerAdapter Nullpointer

Question

我使用Android 支持包中的ViewPager来解决此错误.从使用ViewPager教程的水平视图滑动

06-19 13:07:25.950: E/AndroidRuntime(16382): FATAL EXCEPTION: main
06-19 13:07:25.950: E/AndroidRuntime(16382): java.lang.NullPointerException
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:347)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:342)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:97)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.support.v4.view.ViewPager.populate(ViewPager.java:783)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.View.measure(View.java:12728)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.View.measure(View.java:12728)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.View.measure(View.java:12728)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.View.measure(View.java:12728)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2092)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.View.measure(View.java:12728)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1064)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.os.Looper.loop(Looper.java:137)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at android.app.ActivityThread.main(ActivityThread.java:4424)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at java.lang.reflect.Method.invokeNative(Native Method)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at java.lang.reflect.Method.invoke(Method.java:511)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-19 13:07:25.950: E/AndroidRuntime(16382):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

万一有人没有阅读passsy答案的评论,这里是有用答案的摘要:

1)仔细检查你的getItem(int index)方法并寻找任何逻辑,场景或缺少'break'语句,这些语句可能会导致你最终得到一个null片段.

2)检查返回的计数是否与返回getCount()的片段数相匹配getItem(int index).

3)检查您的进口,确保不会混合android.app.Fragment与android.support.v4.app.Fragment

Answer 2

这是一个简单的解决方案.我混合了android.app.Fragment和android.support.v4.app.Fragment

希望这有助于某人

Answer 3

如果适配器中的getItem()返回null,则可能导致空指针异常.