android– 为什么我的FragmentTransacton()或FragmentManager.beginTransaction()会遇到空指针异常

概述我收到了nullPointerException：java.lang.RuntimeException:UnabletostartactivityComponentInfo{---private---}:java.lang.NullPointerException:Attempttoinvokevirtualmethod'android.support.v4.app.FragmentTransactionandroid.support.v

我收到了nullPointerException：

java.lang.RuntimeException: Unable to start activity ComponentInfo{---private---}:       java.lang.NullPointerException: Attempt to invoke virtual method 'androID.support.v4.app.FragmentTransaction       androID.support.v4.app.FragmentManager.beginTransaction()' on a null object reference            at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2298)            at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)            at androID.app.ActivityThread.access0(ActivityThread.java:144)            at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)            at androID.os.Handler.dispatchMessage(Handler.java:102)            at androID.os.Looper.loop(Looper.java:135)            at androID.app.ActivityThread.main(ActivityThread.java:5221)            at java.lang.reflect.Method.invoke(Native Method)            at java.lang.reflect.Method.invoke(Method.java:372)            at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)            at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:694)     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'androID.support.v4.app.FragmentTransaction       androID.support.v4.app.FragmentManager.beginTransaction()' on a null object reference            at com.zero. ??? .BoxFragment.newInstance(BoxFragment.java:59)            at com.zero. ??? .MainActivity$SectionPagerAdapter.getItem(MainActivity.java:111)            at com.zero. ??? .MainActivity.onCreate(MainActivity.java:58)            at androID.app.Activity.performCreate(Activity.java:5937)            at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)            at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:2251)            at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)            at androID.app.ActivityThread.access0(ActivityThread.java:144)            at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)            at androID.os.Handler.dispatchMessage(Handler.java:102)            at androID.os.Looper.loop(Looper.java:135)            at androID.app.ActivityThread.main(ActivityThread.java:5221)            at java.lang.reflect.Method.invoke(Native Method)            at java.lang.reflect.Method.invoke(Method.java:372)            at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)            at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:694)05-02 17:52:00.093    2227-2227/com.zero.mytoolroom I/Process﹕ Sending signal. PID: 2227 SIG: 9

在这种方法中

/* returns a new instance of this fragment for the given section number */public BoxFragment newInstance(int sectionNumber) {    Log.v(LOG_TAG, "insIDe newInstance()");    manage = getFragmentManager();    BoxFragment fragment = new BoxFragment();    Log.v(LOG_TAG, "Box fragment created");    Bundle args = new Bundle();    args.putInt(ARG_SECTION_NUMBER, sectionNumber);    fragment.setArguments(args);    transaction = manage.beginTransaction();    transaction.add(R.ID.Box_layout,fragment).addToBackStack(null);    transaction.commit();    return fragment;}//end newInstance() 

解决方法:

把它放在你的代码中：

FragmentManager manager = getActivity().getSupportFragmentManager()

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