NullPointerException getArguments（）但有数据

Question

我不明白为什么空指针。我用日志检查有数据

请给我解决方案！

我的代码在这里

我从ViewPagerActivity数据传递到PlayRadio

@Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.viewpager_main_activity); 
     Intent intent = getIntent(); 
     Bundle args = new Bundle(); 
     args = intent.getExtras(); 
     Fragment playRadio = new PlayBlog(); 
     playRadio.setArguments(args); 
     FragmentManager fragment = getSupportFragmentManager(); 
     FragmentTransaction transaction = fragment.beginTransaction(); 
     transaction.replace(R.id.pager, playRadio); 
     transaction.commit(); 
     setUpView(); 
    } 

在PlayRadio我得到价值

public class PlayBlog extends Fragment { 
    Context mContext; 
    String Desciption; 

    public static Fragment newInstance(Context context) { 
     PlayBlog playBlog = new PlayBlog(); 
     return playBlog; 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.playradio_layout, container, 
       false); 
     mContext = container.getContext(); 
     final Animation anim = AnimationUtils.loadAnimation(mContext, 
       R.anim.rotate); 
     ImageView splash = (ImageView) rootView.findViewById(R.id.base); 
     TextView tvDesciption = (TextView) rootView 
       .findViewById(R.id.tv_Marquee); 
     Bundle args = this.getArguments(); 
     Desciption = args.getString(Constant.STRING_KEY); 
     Log.i("", Constant.TAG + "PlayBlog " + Desciption); 
     tvDesciption.setText(Desciption); 
     splash.startAnimation(anim); 
     return rootView; 
    } 

} 

Error at line : Desciption = args.getString(Constant.STRING_KEY);

错误的logcat

02-06 07:41:49.362: E/AndroidRuntime(2534): FATAL EXCEPTION: main 
02-06 07:41:49.362: E/AndroidRuntime(2534): java.lang.NullPointerException 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.tadev.blogradio.main.PlayBlog.onCreateView(PlayBlog.java:37) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.view.ViewPager.populate(ViewPager.java:1068) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.view.ViewPager.populate(ViewPager.java:914) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.View.measure(View.java:15518) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.View.measure(View.java:15518) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.View.measure(View.java:15518) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.View.measure(View.java:15518) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.View.measure(View.java:15518) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.Choreographer.doFrame(Choreographer.java:532) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.os.Handler.handleCallback(Handler.java:725) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.os.Handler.dispatchMessage(Handler.java:92) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.os.Looper.loop(Looper.java:137) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at java.lang.reflect.Method.invoke(Method.java:511) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
02-06 07:41:49.362: E/AndroidRuntime(2534):  at dalvik.system.NativeStart.main(Native Method) 

但是，当我检查说明Logcat给有数据。我不明白它:(

02-06 07:41:49.354: I/(2534): abc PlayBlog Blog Radio - Khi trưởng thành, bạn hay mang trong mình cảm giác lưng chừng cô đơn. Vì, không hẳn là không có người để quan tâm, chăm sóc, nhưng tại một thời điểm nào đó, một phút giây nào đó, bạn vẫn cảm thấy mình chông chênh và lạc lõng giữa chốn đông người... 

更新代码

类NewRadioFragment

btnShowMore.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       if (item.getLink_play() != null) { 
        Toast.makeText(mContext, item.getLink_play(), 
          Toast.LENGTH_SHORT).show(); 
        Intent intent = new Intent(mContext, 
          ViewPagerActivity.class); 
        Bundle bundle = new Bundle(); 
        bundle.putString(Constant.STRING_KEY, Desciption); 
        intent.putExtras(bundle); 
        startActivity(intent); 
       } else { 
        Toast.makeText(mContext, "NULL", Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 

我从NewRadioFragment数据传递到ViewPagerActivity（Bunble）和发送PlayRadio继续

Answer 1

我想你忘了putString到你的args

args.putString(Constant.STRING_KEY,"testing"); 
playRadio.setArguments(args); 

Answer 2

在第一点的线

Bundle args = intent.getExtras(); 
// Here args is null at the first run 

ARGS为您提供了空，因为在意图没有数据。而如果你需要发送一些数据。创建一个intent或捆绑然后把你的数据

Bundle args = new Bundle(); 
args.putString(Constant.STRING_KEY,"testing"); 
playRadio.setArguments(args); 

Answer 3

我认为问题是在接收Fragment类中的数据。

使用代码：

String description = getArguments().getString(YOUR_KEY); // Simply use getArguments istead of this.getArguments() 

它会工作。