我收到 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.access$800(ActivityThread.java:144)
at android.app.ActivityThread$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.access$800(ActivityThread.java:144)
at android.app.ActivityThread$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
在这个方法中
/* 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()
将其放入您的代码中：
FragmentManager manager = getActivity().getSupportFragmentManager()
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