RecyclerView的应用

1. 在build.gradle中添加依赖

    implementation 'com.android.support:recyclerview-v7:28.0.0'
    implementation 'com.github.bumptech.glide:glide:3.7.0'

2. 在xml中添加recyclerview布局

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="55dp">
    </android.support.v7.widget.RecyclerView>

3. CourseAdapter适配器

public class CourseAdapter extends RecyclerView.Adapter<CourseAdapter.MyViewHolder> {

    private Context mContext;
    private List<CourseBean> cbl;

    //通过构造获取上下文
    public CourseAdapter(Context context) {
        mContext = context;
    }

    /**
     * 设置数据更新
     *
     * @param cbl
     */
    public void setData(List<CourseBean>cbl) {
        this.cbl = cbl;
        notifyDataSetChanged();
    }
    /**
     * 创建ViewHolder
     * @param parent
     * @param viewType
     * @return
     */
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(mContext).inflate(R.layout.course_list_item,parent, false);
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }

    /**
     * 绑定ViewHolder
     * @param holder
     * @param position
     */
    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        //设置数据
        holder.tv_title.setText(cbl.get(position).title);
        holder.tv_img_title.setText(cbl.get(position).imgTitle);
        //获取本地图片
        //int id = mContext.getResources().getIdentifier("chapter_"+(position+1)+"_icon","drawable",mContext.getPackageName());
        //holder.iv_img.setImageResource(id);
        //Glide加载网络图片
        String url = "http://10.200.173.18:8080/resource/chapter_"+(position+1)+"_icon.png";
        Glide.with(mContext).load(url).into(holder.iv_img);

        holder.iv_img.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(mContext, VideoListActivity.class);
                intent.putExtra("id",cbl.get(position).id);
                intent.putExtra("intro",cbl.get(position).intro);
                mContext.startActivity(intent);
            }
        });
    }

    /**
     * 获取item 总数
     * @return
     */
    @Override
    public int getItemCount() {
        return cbl == null ? 0 : cbl.size();
    }
    
    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView tv_img_title, tv_title;
        ImageView iv_img;

        public MyViewHolder(View itemView) {
            super(itemView);

            tv_title = (TextView) itemView.findViewById(R.id.tv_title);
            tv_img_title = (TextView) itemView.findViewById(R.id.tv_img_title);
            iv_img = (ImageView) itemView.findViewById(R.id.iv_img);
        }
    }
}

4. View进行数据显示

    //初始化recyclerview布局    
    rv_list = (RecyclerView) mCurrentView.findViewById(R.id.rv_list);
    //设置为2列的表格布局
    rv_list.setLayoutManager(new GridLayoutManager(mContext,2));
    //创建适配器
    adapter = new CourseAdapter(mContext);
    //将数据添加到适配器
    adapter.setData(cbl);
    //将适配的数据添加到recyclerview布局中
    rv_list.setAdapter(adapter);