如何使用界面将活动回调回片段 [英] How to get callback from activity back to fragment using interface

问题描述

我有一个片段，我有一个按钮可以从图库中选择图片。画廊成功开放，但是当我选择图片时，我没有从活动中得到结果。所以我考虑使用回调（接口）。但是，我确实知道如何。

您可以给我一些建议吗？

界面

  public interface CallbackListener {
 void onPhotoTake（String url）; 
} 
  

片段点击

  @OnClick（R.id.addPhoto）void photo（）{
 if（isStoragePermissionGranted（））{
 Intent i =新的意图（Intent.ACTION_PICK，android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI）; 
 context.startActivityForResult（i，RESULT_LOAD_IMAGE）; 
} 
} 
  

活动

  @Override 
 protected void onActivityResult（int requestCode，int resultCode，Intent data）{
 super.onActivityResult（requestCode ，resultCode，data）; 
} 
  

• 这里我想发送结果返回片段使用接口
如果您想要发回数据，请使用

解决方案

对于片段类可以有多种方式来做到这一点：

第一

1. 在片段类中创建公共方法

使用<活动类的 onActivityResult（）

---

第二

1. 在活动中创建界面并在片段中实现该接口。然后在接口的帮助下，将你的数据发送到片段
   例如
   
   $ b $ p Activity class
   
   

     DataReceivedListener侦听器; 
    
    public void setDataReceivedListener（DataReceivedListener listener）{
    this.listener = listener; 
   } 
    
    public interface DataReceivedListener {
    void onReceived（int requestCode，int resultCode，Intent data）
   } 
     

   片段类
   
   

     class fragment extends Fragments实现yourActivityClassName。 DataReceivedListener {
    @Override 
    onViewCreated（...）{
    
    
    
    
    $ b（（yourActivityName）getActivity（））。setDataReceivedListener（this）; 
    
    
    $ / code> 

   在Acitivity类中



     @Override 
    protected void onActivityResult（int requestCode，int resultCode，Intent data）{
    super.onActivityResult（requestCode，resultCode，data） ; 
    if（listener！= null）{
    listener.onActivityResult（requestCode，resultCode，data）; 
   } 
   } 
     

   


   I have a fragment, where I have a button to choose an image from a gallery. The gallery is open successfully, but when I choose the image, I do not get the result from activity. So I consider to use a callback (interface). However, I do know how.

   Could you suggest me something please?

   interface

   public interface CallbackListener {
       void onPhotoTake(String url);
   }
   

   in fragment click

   @OnClick(R.id.addPhoto) void photo() {
           if (isStoragePermissionGranted()) {
               Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
               context.startActivityForResult(i, RESULT_LOAD_IMAGE);
           }
   }
   

   activity

   @Override
       protected void onActivityResult(int requestCode, int resultCode, Intent data) {
           super.onActivityResult(requestCode, resultCode, data);
   }
   

   • here I would like to send result back to fragment using interface

   解决方案

   If you want to send data back to fragment class there can be a number of ways to do that:

   First

   1. Create a public method in fragment class

   2. Call that method using the fragment object in activity class's onActivityResult()

   ---

   Second

   1. Create an interface in activity and implement that interface in fragment. Then with the help of interface, send your data to fragment e.g.

   Activity class

   DataReceivedListener listener;
   
   public void setDataReceivedListener(DataReceivedListener listener) {
       this.listener = listener;
   }
   
   public interface DataReceivedListener {
       void onReceived(int requestCode, int resultCode, Intent data)
   }
   

   Fragment Class

   class fragment extends Fragments implements yourActivityClassName.DataReceivedListener {
       @Override
       void onReceived(int requestCode, int resultCode, Intent data) {
   
       }
   
       onViewCreated(...) {
           ((yourActivityName) getActivity()).setDataReceivedListener(this);
       }
   }
   

   in Acitivity class

   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
       if (listener != null) {
           listener.onActivityResult(requestCode, resultCode, data);
       }
   }
   

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