从列表视图中传递数据到片段

Question

当我点击列表视图时，包可以获取值，但不能将值传递给第二个片段。 第一块碎片

categorylist.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

      final String category = ((TextView) view.findViewById(R.id.mainproductitem)).getText().toString(); 
      details_fragment ldf = new details_fragment(); 
      Bundle args = new Bundle(); 
      args.putString("category", category); 
      ldf.setArguments(args); 
     } 
    }); 
     return view; 

} 

第二块碎片

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 

    view=inflater.inflate(R.layout.my_fragment2, container, false); 
    test = (TextView)view.findViewById(R.id.textView); 

    Bundle args = getArguments(); 
    if (args != null && args.containsKey("category")){ 
     String userId = args.getString("category"); 
     test.setText(userId); 
    } 
    return view; 
} 

Answer 1

HomeActivity.xml

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="com.example.activity.HomeActivity" 
    tools:showIn="@layout/app_bar_home"> 

//View that will hold all the fragments 
<FrameLayout 
    android:id="@+id/container_view" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
</FrameLayout> 

FirstFragment

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 

    View view = inflater.inflate(R.layout.fragment1, container, false); 
    view.setBackgroundColor(Color.WHITE); 

    listViewAdapter.SetOnItemClickListener(new OnItemClickListener() { 
        @Override 
        public void onItemClick(View view, int position) { 
         SecondFragment secondFrag = new SecondFragment(); 
         Bundle args = new Bundle(); 
         args.putString("Key","some value"); 

         secondFrag .setArguments(args); 
         getFragmentManager() 
         .beginTransaction() 
         .replace(R.id.container_view, fragment) 
         .addToBackStack(null) 
         .commit(); 
        } 
       }); 
    return view; 
} 

SecondFragment

我尝试了这一点，它完美的作品。

Answer 2

你可能会忘记启动第二个片段

categorylist.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

      final String category = ((TextView) view.findViewById(R.id.mainproductitem)).getText().toString(); 
      details_fragment ldf = new details_fragment(); 
      Bundle args = new Bundle(); 
      args.putString("category", category); 
      ldf.setArguments(args); 
      FragmentManager fragmentManager = getActivity().getSupportFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      fragmentTransaction.replace(R.id.yourContainer, ldf); 
      fragmentTransaction.addToBackStack(null); 
      fragmentTransaction.commit(); 

     } 
    }); 
} 

和你第二个活动

Bundle agrs = getArguments(); 
if (args != null) { 
    String category = agrs.getString("category"); 
    test.setText(category); 
} 

Answer 3

试试这个：在您接收片段：

Bundle agrs = this.getArguments(); 
if (args != null) { 
    String myStr = args.getString(key, defaultValue); 
} 

Answer 4

`Use this code in your categorylist.setOnItemClickListener` 

// Create fragment and give it an argument specifying the article it should show 
    details_fragment newFragment = new details_fragment(); 
    Bundle args = new Bundle(); 
    args.putString("category", category) 

    //Note: if your are in fragment than replace getSupportFragmentManager to getFragmentManager. 

     FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 

    // Replace whatever is in the fragment_container view with this fragment, 
    // and add the transaction to the back stack so the user can navigate back 
     transaction.replace(R.id.fragment_container, newFragment); 
     transaction.addToBackStack(null); 

    // Commit the transaction 
     transaction.commit(); 

Answer 5

使用组合。下面是一个例子：

Fragment fragment = new Fragment(); 
Bundle bundle = new Bundle(); 
bundle.putString(key, value); 
fragment.setArguments(bundle); 
getFragmentManager().beginTransaction().replace(R.id.container_view, bundle).commit(); 

Bundle已经为很多数据类型提供了方法。见this在片段

然后，检索的数据（例如，在onCreate（）方法）有：

Bundle bundle = this.getArguments(); 
if (bundle != null) { 
    int myInt = bundle.getString(key, defaultValue); 
} 

Answer 6

在第一块碎片

categorylist.setOnItemClickListener(new AdapterView.OnItemClickListener() 
{ 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

      final String category = ((TextView) view.findViewById(R.id.mainproductitem)).getText().toString(); 
      MainActivity main=new MainActivity(); 
        main.openSecondFrag(); 
     } 
    }); 
     return view; 

} 

在您的MainActivity，把openSecondFrag（）方法

public void openSecondFrag(){ 
details_fragment ldf = new details_fragment(); 
       Bundle args = new Bundle(); 
       args.putString("category", category); 
       ldf.setArguments(args); 
} 

在第二块碎片

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 

    view=inflater.inflate(R.layout.my_fragment2, container, false); 
    test = (TextView)view.findViewById(R.id.textView); 

    Bundle args = getArguments(); 
    if (args != null && args.containsKey("category")){ 
     String userId = args.getString("category"); 
     test.setText(userId); 
    } 
    return view; 
} 

我相信它会起作用。