Android：错误从活动传递数据到片段

-1

创建与此链接选项卡的布局和滑动式视图的应用程序： source

我有活性文件下1个活动文件TabMainActivity.java和3片段的类。

我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，当我尝试从TabMainActivity.java数据传递到MyLockerFragment.java（片段文件）。

TabMainActivity.java-

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main_menu); 
    String email = "[email protected]"; 
    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"); 
}

错误是在这一行：String email=bundle.getString("email");

我失去了一些东西根本？

来源

2014-01-18 user2445971

“_Error是在这条线..._” 而且那会是什么错误？请在您的问题中发布logcat输出。 – csmckelvey

嗨，我得到了一个java.lang.NullPointerException错误在线： – user2445971

当您将“电子邮件”添加到您的包，然后将它传递到您的片段，是否已初始化电子邮件？这行'bundle.putString（“email”，email）;'你在哪里创建了'email'变量？ – csmckelvey

在TabMainActivity.java：

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main_menu); 
    String email = "[email protected]"; 
    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：

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; 
    }

来源

2014-01-19 03:56:13

嗨我试过上面的代码，但我不断得到一个java.lang.NullPointerException在捆绑bundle = this.getArguments（）; \t \t String email = bundle.getString（“email”）; – user2445971

Android：错误从活动传递数据到片段

回答

相关问题