无法将字符串值从一个片段传递到另一个片段

Question

我知道有这么多问题，但他们都不能解决我的问题 我想将字符串变量从一个片段传递到另一个片段，这里是代码我做到了。但我得到的错误从我做

Desc_1 ldf = new Desc_1(); 
Bundle args = new Bundle(); 
args.putString("YourKey", "YourValue"); 
ldf.setArguments(args); 
getFragmentManager().beginTransaction().add(R.id.frame, ldf).commit(); 

和传入我不喜欢

public class Desc_1 extends Fragment { 

    public Desc_1() { 
     // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 

     View rootview=inflater.inflate(R.layout.fragment_desc_1,container,false); 

     String value = getArguments().getString("YourKey"); 

     Toast.makeText(getActivity(), value, 
       Toast.LENGTH_LONG).show(); 

     return rootview; 

    } 
} 

我收到错误，如

第二片的第一片段（我将显示错误）

07-27 20:31:06.386 26816-26816/com.example.jaison.newsclient E/AndroidRuntime: FATAL EXCEPTION: main 
    Process: com.example.jaison.newsclient, PID: 26816 
    java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference 
     at layout.Desc_1.onCreateView(Desc_1.java:34) 
     at android.support.v4.app.Fragment.performCreateView(Fragment.java:2239) 
     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1332) 
     at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1574) 
     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1641) 
     at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:794) 
     at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2415) 
     at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2200) 
     at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2153) 
     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2063) 
     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:725) 
     at android.os.Handler.handleCallback(Handler.java:815) 
     at android.os.Handler.dispatchMessage(Handler.java:104) 
     at android.os.Looper.loop(Looper.java:207) 
     at android.app.ActivityThread.main(ActivityThread.java:5769) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:861) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:751) 

Answer 1

试试这个：

Bundle bundle = getArguments(); 
if(bundle != null) 
    String value = bundle.getString("YourKey"); 

Answer 2

只需检查在您的片段内是否为空，然后在卷曲内Ÿ括号添加代码

例子：

Bundle bundle_arguments = getArguments(); 
if(bundle_arguments != null) { 
    // your code 
} 

Answer 3

请检查这个答案片段之间传递值

https://stackoverflow.com/a/27626004/5065318