Question

您好我是Android编程的新手。

我使用此链接创建了一个带有标签布局和可滑动视图的应用程序： source

我在活动文件下有1个活动文件TabMainActivity.java和3个片段类。

我的TabMainActivity.java引用此xml文件：

 main_menu.xml
 <android.support.v4.view.ViewPager   
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/pager"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 </android.support.v4.view.ViewPager>

我遇到的错误是当我尝试将数据从TabMainActivity.java传递到MyLockerFragment.java（片段文件）时。

TabMainActivity.java -

protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main_menu);
     String email = "tv.nguyen.2011@sis.smu.edu.sg";
     Bundle bundle=new Bundle();
     bundle.putString("email", email);
     MyLockerFragment fragobj=new MyLockerFragment();
     fragobj.setArguments(bundle);
  }//end of of onCreate method

MyLockerFragment.java -

 public class MyLockerFragment extends Fragment {
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_mylocker,  
                     container, false);
            Bundle bundle = this.getArguments();
            String email=bundle.getString("email");
}

错误在此行：String email=bundle.getString("email");

我错过了一些基本的东西吗？

Answer 1

在TabMainActivity.java中：

protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main_menu);
     String email = "tv.nguyen.2011@sis.smu.edu.sg";
     Bundle bundle=new Bundle();
     bundle.putString("email", email);
     MyLockerFragment fragobj=new MyLockerFragment();
     fragobj.setArguments(bundle);

     //You needed to add this line to the fragment Activity onCreate() method(othwewise the getArguments() would return null):

     getSupportFragmentManager().beginTransaction().add(android.R.id.content, fragobj).commit();


  }//end of of onCreate method

在MyLockerFragment.java中：

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

        String email = getArguments().getString("email");  

        View rootView = inflater.inflate(R.layout.fragment_mylocker,  
                     container, false);          

        return rootView;
    }

Android：将数据从活动传递到片段时出错

1 个答案: