java - 无法将字符串值从一个 fragment 传递到另一个 fragment

Question

我知道有很多关于此的问题，但没有一个能解决我的问题 我想将字符串变量从一个 fragment 传递到另一个 fragment ，这是我所做的代码。但我收到错误(我将显示错误)

从我做的第一个 fragment 开始

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();

以及我喜欢的第二个 fragment

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;

    }
}

我收到类似错误

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");