널 포인터 예외 - android.support.v7.widget.ShareActionProvider

Question

내가 코드 아래 사용하여, 지난 2 시간 동안 간단한 프로그램을 쓰고 있어요,하지만이 작은 문제의 해결책을하지 않았다 :

MainActivity.java -

@Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main, menu); 

     // Set up ShareActionProvider's default share intent 
     MenuItem shareItem = menu.findItem(R.id.share); 

     ShareActionProvider mShareActionProvider = (ShareActionProvider) 
       MenuItemCompat.getActionProvider(shareItem); 

     mShareActionProvider.setShareIntent(getDefaultIntent()); 

     return super.onCreateOptionsMenu(menu); 
    } 

    private Intent getDefaultIntent() { 
     Intent intent = new Intent(Intent.ACTION_SEND); 
     intent.setType("text/plain"); 
     intent.putExtra(Intent.EXTRA_SUBJECT, "I am using Android App !!!"); 
     return intent; 
    } 
} 

main.xml에 -

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:yourapp="http://schemas.android.com/apk/res-auto" > 
    <item 
     android:id="@+id/share" 
     android:title="@string/share" 
     yourapp:actionProviderClass="android.support.v7.widget.ShareActionProvider" 
     yourapp:showAsAction="ifRoom" /> 

</menu> 

내가 wher을 받고 있지 않다 나는이 작은 프로그램에서 실수를 저지르고있다 ... 나의 실수를 알리고 이것을 해결하도록 도와주세요!

는 행 번호는 :

mShareActionProvider.setShareIntent(getDefaultIntent()); 

79

나는이 tutorial

로그 말한다 다음 :

02-20 05:51:48.814: E/AndroidRuntime(2012): FATAL EXCEPTION: main 
02-20 05:51:48.814: E/AndroidRuntime(2012): Process: com.learn2crack.tab, PID: 2012 
02-20 05:51:48.814: E/AndroidRuntime(2012): java.lang.NullPointerException 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at com.learn2crack.tab.MainActivity.onCreateOptionsMenu(MainActivity.java:79) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.app.Activity.onCreatePanelMenu(Activity.java:2538) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:436) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at com.android.internal.policy.impl.PhoneWindow.doInvalidatePanelMenu(PhoneWindow.java:800) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:221) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.view.Choreographer.doFrame(Choreographer.java:543) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.os.Handler.handleCallback(Handler.java:733) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.os.Handler.dispatchMessage(Handler.java:95) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.os.Looper.loop(Looper.java:136) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at java.lang.reflect.Method.invoke(Method.java:515) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
02-20 05:51:48.814: E/AndroidRuntime(2012):  at dalvik.system.NativeStart.main(Native Method) 
02-20 05:51:51.484: I/Process(2012): Sending signal. PID: 2012 SIG: 9 

Answer 1

당신이 시도 할 수 있습니다, 그것은 나를

에 대한 작업입니다

Answer 2

나를 위해 문제는 proGuard에있었습니다. 이것을 규칙 파일에 추가 한 후에 문제가 해결되었습니다 :

-keep class android.support.v7.widget.ShareActionProvider { *; } 
-keep class android.support.v7.widget.SearchView { *; }