Firebase 更新后 RecyclerView 不刷新

Question

我有一个 RecyclerView，对于每个项目，您可以启动 EditActivity（用于结果）以使用 Firebase 更新您的文本。

问题是当你回到RecyclerView时，数据没有刷新

这是来自我的适配器的代码：

holder.editBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent edit_intent = new Intent(holder.authorText.getContext(), EditActivity.class);
                    edit_intent.putExtra("text", textList.get(position).getBody());
                    edit_intent.putExtra("id", textList.get(position).textId);
                    ((Activity) context).startActivityForResult(edit_intent, 1);
                }
            });

 public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 1) {
            if(resultCode == RESULT_OK){
                notifyDataSetChanged();
            }
        }
    }

这是我的 EditActivity 中的代码：

edit_btn.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        mProgress.setVisibility(View.VISIBLE);
        edit_btn.setVisibility(View.INVISIBLE);
        String new_text = edit_text.getText().toString();
        mFirestore.collection("Text").document(text_id).update("body", new_text).addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if(task.isSuccessful()){
                    Toast.makeText(EditActivity.this, R.string.changes, Toast.LENGTH_LONG).show();
                    Intent intent = new Intent();
                    intent.putExtra("newText", new_text);
                    setResult(RESULT_OK, intent);
                    finish();
                }
                else{
                    String error = task.getException().getMessage();
                    Toast.makeText(EditActivity.this, R.string.error + error, Toast.LENGTH_LONG).show();
                }
                mProgress.setVisibility(View.INVISIBLE);
                edit_btn.setVisibility(View.VISIBLE);
            }
        });
    }
});

如何用新的 Text 刷新 RecyclerView 和 setText ？

非常感谢您的帮助:)

Answer 1

你做错的事情很少。

1. 将 clickedItem 位置传递给 EditActivity 以便稍后更新。

   holder.editBtn.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               Intent edit_intent = new Intent(holder.authorText.getContext(), EditActivity.class);
               edit_intent.putExtra("text", textList.get(position).getBody());
               edit_intent.putExtra("id", textList.get(position).textId);
               edit_intent.putExtra("position", position);
               ((Activity) context).startActivityForResult(edit_intent, 1);
           }
       });
   

2. 在EditActivity 中，将位置保存在变量中并用新文本返回

   setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               mProgress.setVisibility(View.VISIBLE);
               edit_btn.setVisibility(View.INVISIBLE);
               String new_text = edit_text.getText().toString();
               mFirestore.collection("Text").document(text_id).update("body", new_text).addOnCompleteListener(new OnCompleteListener<Void>() {
                   @Override
                   public void onComplete(@NonNull Task<Void> task) {
                       if(task.isSuccessful()){
                           Toast.makeText(EditActivity.this, R.string.changes, Toast.LENGTH_LONG).show();
                           Intent intent = new Intent();
                           intent.putExtra("newText", new_text);
                           //Return the position s well
                           intent.putExtra("position", position);
                           setResult(RESULT_OK, intent);
                           finish();
                       }
                       else{
                           String error = task.getException().getMessage();
                           Toast.makeText(EditActivity.this, R.string.error + error, Toast.LENGTH_LONG).show();
                       }
                       mProgress.setVisibility(View.INVISIBLE);
                       edit_btn.setVisibility(View.VISIBLE);
                   }
               });
           }
       });
   

3. 在适配器的父活动中覆盖 onActivityResult()

   public void onActivityResult(int requestCode, int resultCode, Intent data) {
       if (requestCode == 1) {
           if(resultCode == RESULT_OK){
   
             String newText = data.getStringExtra("newText");
             int itemPosition = data.getIntExtra("position");
   
             //Pass these values to adapter through `updateItem` method
               adapter.updateItem(newText, itemPosition);
           }
       }
   }
   

4. 在适配器类中定义updateItem方法

   public void updateItem(String newData, int index)
   {
     textList.set(index, newData);
     adapter.notifyItemChanged(index);
   }
   

干杯:)