java - Firebase更新后，RecyclerView不刷新

我有一个RecyclerView，对于每个项目，您都可以启动EditActivity（用于Result）以使用Firebase更新文本。

问题是，当您返回到RecyclerView时，不会刷新数据

这是我的适配器的代码：

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);
            }
        });
    }
});

如何使用新的Text刷新RecyclerView和setText？

我将非常感谢您的帮助:)

最佳答案

您做错的事情很少。


将clickedItem位置传递给EditActivity以便以后进行更新。

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);
        }
    });

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);
                }
            });
        }
    });

覆盖适配器的父活动中的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);
        }
    }
}

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:)