如何从Android适配器中调用片段中的方法 [英] How to call method in fragment from adapter Android

问题描述

我需要帮助，所以我有一个带有 RecycleView 的片段，并且在 RecycleView 里面有一个按钮.

I need help so I have a fragment which has a RecycleView and inside the RecycleView there is a button.

单击后的按钮必须打开已经在基本片段中声明的对话框，因此我只能像 openDialog(DIALOG_CHECK);

The button after click must open the dialog which already declared in base fragment so I only call like openDialog(DIALOG_CHECK);

现在如何在适配器上调用该对话框，我已经在片段中创建了一个方法，并从适配器中调用了该方法，并出现错误"Java lang空指针"

Now how can I call that dialog on my adapter I already make a method in fragment and call it from the adapter and make an error "Java lang null pointer"

这是我的代码:

DeliveryFragment delivFrag = new DeliveryFragment();
holder.editButton.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
         delivFrag.doEdit();
     }
});

还有片段

public void doEdit(){
   openDialog(DIALOG_EDIT_ITEM);
}

推荐答案

只是一个简单的示例，可以使您更好地理解.使用界面.

Just a simple example for better understanding. Use an interface.

public class TestAdapter extends RecyclerView.Adapter<TestAdapter.ViewHolder> {    
  private static OnItemClickListener mOnItemClickLister;

  public interface OnItemClickListener {
    void onItemClicked(View view, int pos);
  }

  public void setOnItemClickListener(OnItemClickListener listener) {    
    mOnItemClickLister = listener;
  }

  public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {    
    Button mBtnTest;
    Context mContext;

    //We also create a constructor that accepts the entire item row
    //and does the view lookups to find each subview.
    public ViewHolder(Context context, View itemView) {    
      //Stores the itemView in a public final member variable that can be used
      //to access the context from any ViewHolder Instance
      super(itemView);    
      mContext = context;
      mBtnTest = (Button) itemView.findViewById(R.id.message_button);
      itemView.setOnClickListener(this);
    }

    @Override public void onClick(View v) {
      int position = v.getLayoutDirection();
      mOnItemClickLister.onItemClicked(v, position);
    }
  }
}   

片段部分

class FragmentTest extends Fragment implements OnItemClickListener {    
  TestAdapter adapter = new TestAdapter(); //you can initialize according to  your logic

  //set the fragment as a listener to adapter
  this.adapter.setOnItemClickListener(onItemClickListener);

  public void onItemClicked(View view, int pos) {
    //do whatever you want here...
  }
}

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