Question

我在我的片段中使用了setMenuVisibility（）方法。

 @Override
    public void setMenuVisibility(boolean menuVisible) {
        super.setMenuVisibility(menuVisible);

        if (menuVisible) {
            Toast.makeText(Global.getGcontext(), "Hot",Toast.LENGTH_SHORT).show();
        }}

我的项目中有3个片段，当我从fragment1移动到fragment3时我收到这个错误：

＆＃13;

   11-28 17:54:26.678    3777-3777/ir.keeyow.alaki E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: ir.keeyow.alaki, PID: 3777
    java.lang.NullPointerException
            at ir.keeyow.alaki.ir.keeyow.alaki.app.HotAlakiFragment.setMenuVisibility(HotAlakiFragment.java:233)
            at android.support.v4.app.FragmentStatePagerAdapter.setPrimaryItem(FragmentStatePagerAdapter.java:149)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:802)
            at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:433)
            at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:405)
            at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:386)
            at com.astuetz.viewpager.extensions.PagerSlidingTabStrip$2.onClick(PagerSlidingTabStrip.java:240)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            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:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

＆＃13;

问题是什么？

错误：片段中setMenuVisibility（）的java.lang.NullPointerException

0 个答案: