Question

我使用ViewPagerIndicator时遇到问题，但我认为问题是使用支持库android。当我在我的代码中启动一个新活动时，我有一个NullPointerException。那就是代码：

protected void onCreate（Bundle savedInstanceState）{

    super.onCreate(savedInstanceState);
    // FULLSCREEN
    /*requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    */
    setContentView(R.layout.level);
   try{
    mAdapter = new FragmentAdapter(getSupportFragmentManager());

    mPager = (ViewPager)findViewById(R.id.pager);
    mPager.setAdapter(mAdapter);

    mIndicator = (TitlePageIndicator)findViewById(R.id.indicator);
    mIndicator.setViewPager(mPager);

   }
@Override
public void onSaveInstanceState(Bundle outState) {
    // Workaround to avoid NPE from support library bug:

    super.onSaveInstanceState(outState);
}

，日志跟踪为：

03-21 17:34:39.694: E/AndroidRuntime(30225): FATAL EXCEPTION: main
03-21 17:34:39.694: E/AndroidRuntime(30225): Process: es.uam.eps.dadm.mark, PID: 30225
03-21 17:34:39.694: E/AndroidRuntime(30225): java.lang.NullPointerException
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1576)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1617)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:481)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at es.uam.eps.dadm.mark.Level.onSaveInstanceState(Level.java:54)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.Activity.performSaveInstanceState(Activity.java:1153)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1223)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3175)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3234)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.ActivityThread.access$1100(ActivityThread.java:135)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1223)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.os.Handler.dispatchMessage(Handler.java:102)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.os.Looper.loop(Looper.java:136)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at android.app.ActivityThread.main(ActivityThread.java:5017)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at java.lang.reflect.Method.invokeNative(Native Method)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at java.lang.reflect.Method.invoke(Method.java:515)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
03-21 17:34:39.694: E/AndroidRuntime(30225):    at dalvik.system.NativeStart.main(Native Method)

你能帮帮我吗？

Android支持库NullPointerException

0 个答案: