在 recyclerview 中更改所选项目的背景颜色 [英] Changing background color of selected item in recyclerview

问题描述

如何在我的回收视图示例中仅更改选定视图的背景颜色?只需更改单击的项目视图的背景颜色.一次只能显示一个选择的项目，背景颜色改变，其余的需要和选择前一样.这是我的代码:

How to change the background color of only selected view in my recycle view example?only the background color of clicked itemview needs to be changed. Only one selected item must be displayed with background color change at a time and the rest needs to be as before selecting. here is my code :

主活动

public class MainActivity extends AppCompatActivity {
RecyclerView rv1;
    private  final String android_versions[]={
                "Donut",
                "Eclair",
                "Froyo",
                "Gingerbread",
                "Honeycomb",
                "Ice Cream Sandwich",
                "Jelly Bean",
                "KitKat",
                "Lollipop",
                "Marshmallow"
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
    }

    private  void initViews(){
        rv1=(RecyclerView)findViewById(R.id.recyclerView1);
        rv1.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager=new LinearLayoutManager(getApplicationContext());
        rv1.setLayoutManager(layoutManager);

        RecyclerDataAdapter rda=new RecyclerDataAdapter(rv1,getApplicationContext(),android_versions);
        rv1.setAdapter(rda);
    }
}

RecyclerDataadapter

public class RecyclerDataAdapter extends RecyclerView.Adapter<RecyclerDataAdapter.ViewHolder> {

private String android_versionnames[];
    private Context context1;

    private RecyclerView mRecyclerView;


    public RecyclerDataAdapter(RecyclerView recylcerView,Context context,String android_versionnames[]){
        this.android_versionnames=android_versionnames;
        this.context1=context;
mRecyclerView=recylcerView;
        setHasStableIds(true);
        System.out.println("Inside dataadapter,Android names : 
 ");
        for(int i=0;i<android_versionnames.length;i++){
            System.out.println("
"+android_versionnames[i]);
        }
    }


    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        holder.tv1.setText(android_versionnames[position]);
    }


    @Override
    public int getItemCount() {
        return android_versionnames.length;
    }


    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView tv1;
        LinearLayout row_linearlayout;
        RecyclerView rv2;

        public ViewHolder(final View itemView) {
            super(itemView);
            tv1=(TextView)itemView.findViewById(R.id.txtView1);
            row_linearlayout=(LinearLayout)itemView.findViewById(R.id.row_linrLayout);
            rv2=(RecyclerView)itemView.findViewById(R.id.recyclerView1);
            /*itemView.setBackgroundColor(0x00000000);//to transparent*/

        }
    }
}

推荐答案

终于，我得到了答案.

public void onBindViewHolder(final ViewHolder holder, final int position) {
        holder.tv1.setText(android_versionnames[position]);

        holder.row_linearlayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                row_index=position;
                notifyDataSetChanged();
            }
        });
        if(row_index==position){
            holder.row_linearlayout.setBackgroundColor(Color.parseColor("#567845"));
            holder.tv1.setTextColor(Color.parseColor("#ffffff"));
        }
        else
        {
            holder.row_linearlayout.setBackgroundColor(Color.parseColor("#ffffff"));
            holder.tv1.setTextColor(Color.parseColor("#000000"));
        }

    }

这里'row_index'最初设置为'-1'

here 'row_index' is set as '-1' initially

public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView tv1;
        LinearLayout row_linearlayout;
        RecyclerView rv2;

        public ViewHolder(final View itemView) {
            super(itemView);
            tv1=(TextView)itemView.findViewById(R.id.txtView1);
            row_linearlayout=(LinearLayout)itemView.findViewById(R.id.row_linrLayout);
            rv2=(RecyclerView)itemView.findViewById(R.id.recyclerView1);
        }
    }

这篇关于在 recyclerview 中更改所选项目的背景颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！