java - 如何更改回收 View 元素的颜色？

Question

如果字符串与二维码中的字符串匹配，我想更改 Recyclerview 中 cardview 的颜色。如果字符串匹配，我可以显示 toast，但我也想更改 Recyclerview 中该特定元素的颜色。

这是选择扫描项目的代码

recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getApplicationContext(), new RecyclerItemClickListener.OnItemClickListener() {
                @Override
                public void onItemClick(View view, int position) {
                   tempString = passengerDataModelList.get(position).getPnr();
                   tempClickPosi = position;
                    Intent intent = new Intent("com.google.zxing.client.android.SCAN");
                    startActivityForResult(intent, 0);

                }
            }));

现在在 ActivityResult 我将得到结果:

    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
            if (requestCode == 0) {
                if (resultCode == RESULT_OK) {
                    String contents = intent.getStringExtra("SCAN_RESULT");
                    String format = intent.getStringExtra("SCAN_RESULT_FORMAT");


                    if(contents.equalsIgnoreCase(tempString)){
                        Toast.makeText(this, "String MATCHED", Toast.LENGTH_SHORT).show();
///// Here I want to change the color of that item in recycler view
                    }else if(!contents.equalsIgnoreCase(tempString)){
                        Toast.makeText(this, "String NOT MATCHED", Toast.LENGTH_SHORT).show();
                    }else {
                        Toast.makeText(this, "Error in scanning", Toast.LENGTH_SHORT).show();
                    }


                }
            }

        }

所以请帮助我更改 Activity 中该特定项目的颜色。如果需要更多信息请评论。 谢谢您

Answer 1

假设你有一个模型

public class PassengerData{

  //add this property
  private boolean isMatched = false;

  void setMatched(boolean matched){
        this.isMatched = matched;
  }

  boolean isMatched(){
       return isMatched;
  }

}

然后在recyclerview的 bindview中验证 boolean 值，

boolean matched = passengerDataModelList.get(position).isMatched();
cardview.setBackgroundColor(matched ? R.color.matched_color : R.color.unmatched_color);

然后在 Activity 中

    if(contents.equalsIgnoreCase(tempString)){
                            Toast.makeText(this, "String MATCHED", Toast.LENGTH_SHORT).show();
    ///// Here I want to change the color of that item in recycler view
              // modify `isMatched` value for that item and call `notifyDataSetChanged`();
     }