无法从FragmentActivity调用活动

我面临一个小问题，我想从FragmentActivity调用Activity。我该怎么做？无法从FragmentActivity调用活动

这是我的代码。

（编辑）

class myClass Extends FragmentActivity 
{ 


    OnCreate() 
    { 
     DirectionalViewPager pager = (DirectionalViewPager) findViewById(R.id.pager); 
     pager.setOrientation(DirectionalViewPager.VERTICAL); 
     pager.setAdapter(new TestFragmentAdapter(getSupportFragmentManager())); 
     // I think problem is with this above line in setting adapter because when I remove above three line it is not showing me error.. 
    } 

    OnClick() 
    { 

     Intent intent = new Intent(myClass.this,nextClass.class); 
     startActivity(intent); 

    } 

} 

class TestFragmentAdapter extends FragmentPagerAdapter { 
    final String[] CONTENT = new String[] { "One", "Two", "Three", 
      "Four","Five","Six","Seven","Eight","Nine" }; 

    public TestFragmentAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     return TestFragment.newInstance(CONTENT[position]); 
    } 

    @Override 
    public int getCount() { 
     return CONTENT.length; 
    } 
}

错误：

08-25 17:37:04.230: W/dalvikvm(32535): threadid=1: thread exiting with uncaught exception (group=0x400cf760) 
08-25 17:37:04.260: E/AndroidRuntime(32535): FATAL EXCEPTION: main 
08-25 17:37:04.260: E/AndroidRuntime(32535): java.lang.RuntimeException: Unable to pause activity {com.chirag.teahouse/com.chirag.teahouse.TeaHouseActivity}: java.lang.NullPointerException 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2490) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2447) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2425) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread.access$1700(ActivityThread.java:122) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1012) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.os.Handler.dispatchMessage(Handler.java:99) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.os.Looper.loop(Looper.java:132) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread.main(ActivityThread.java:4028) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at java.lang.reflect.Method.invokeNative(Native Method) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at java.lang.reflect.Method.invoke(Method.java:491) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at dalvik.system.NativeStart.main(Native Method) 
08-25 17:37:04.260: E/AndroidRuntime(32535): Caused by: java.lang.NullPointerException 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.support.v4.view.ViewPager.onSaveInstanceState(ViewPager.java:507) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at com.directionalviewpager.DirectionalViewPager.onSaveInstanceState(DirectionalViewPager.java:454) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.view.View.dispatchSaveInstanceState(View.java:8258) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1990) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1996) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1996) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.view.View.saveHierarchyState(View.java:8241) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at com.android.internal.policy.impl.PhoneWindow.saveHierarchyState(PhoneWindow.java:1603) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.Activity.onSaveInstanceState(Activity.java:1164) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:470) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.Activity.performSaveInstanceState(Activity.java:1114) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1184) 
08-25 17:37:04.260: E/AndroidRuntime(32535): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2472) 
08-25 17:37:04.260: E/AndroidRuntime(32535): ... 12 more

来源

2012-08-25 Chirag Patel

后（从logcat中） – YuviDroid

相关的错误：http://stackoverflow.com/questions/5427876/startactivity-doesnt-work-from-a-fragment-in-honeycomb – Dalmas

@YuviDroid对于错误我编辑我的阙。 –

你在你的问题粘贴代码不正确的语法，所以我假设你为了写在这里手动不包含敏感的代码？ ...无论如何...

你的日志显示你的错误不是在开始一个新的活动，而是暂停/保存你当前的活动。

你可以从你的错误，请参阅：

at com.directionalviewpager.DirectionalViewPager.onSaveInstanceState(DirectionalViewPager.java:454)

那你的onSaveInstanceState（）覆盖方法是什么失败。

希望有所帮助。

来源

2012-09-26 14:50:01 Graeme

设置适配器后尝试pager.setSaveEnabled（false）。

来源

2013-01-30 21:34:48 sgadde

您可以使用此代码

OnClick() 
{ 
    Intent intent = new Intent(getActivity(),nextClass.class); 
    startActivity(intent); 
}

来源

2013-08-04 21:24:18

-1

设置适配器后，尝试pager.setSaveEnabled(false)。这个对我有用。

来源

2014-06-30 00:30:26

无法从FragmentActivity调用活动

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