PROSAGA码农传奇-安卓-Android：在recyclerview上选择默认项目

<div class =“post-text”itemprop =“text”>
  <P>
    我创建了示例RecyclerView适配器。您可以使用View而不是TextView和setAlpha（）而不是setTextColor（）。你应该在你的片段中触发checkedItem（int）方法然后notifyDataSetChanged或notifyItemChanged（）
  </p>
   <pre>
    <code>
          /**
    * Created by beyazid on 11.03.2019.
    */
    public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

private Context context;
    private LayoutInflater inflater;
    private ArrayList<String> list;
    private int indexOfHighlightedItem = -1;

public MyAdapter(Context context, ArrayList<String> list) {
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    this.context = context;
    this.list = list;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = inflater.inflate(R.layout.my_row_for_recycler_view, parent, false);
    return new MyViewHolder(view);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
    holder.bindItem(position);
    holder.tvDummy.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            indexOfHighlightedItem = position;
            notifyDataSetChanged();
        }
    });
}

@Override
public int getItemCount() {
    return list.size();
}

public void checkedItem(int pos){
    indexOfHighlightedItem = pos;
}
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    TextView tvDummy;
    public MyViewHolder(View itemView) {
        super(itemView);
        tvDummy = itemView.findViewById(R.id.text);
    }
    void bindItem(int pos) {
        String txt = list.get(pos);
        tvDummy.setText(txt);
        if(indexOfColoredItem==pos){
            tvDummy.setTextColor(ContextCompat.getColor(context, R.color.selectedColor));
        } else{
            tvDummy.setTextColor(ContextCompat.getColor(context, R.color.yourDefaulColor));
        }
    }
}

}

</code>
  </pre>
  <P>
    您只需创建一个整数即可获得所选位置。喜欢
    <BR/>
    
       -  private int indexOfHighlightedItem = -1;
  </p>
</DIV>