recyclerview

在build.gradle配置RecyclerView的库

选择的是26的，我的sdk是25.3.1，所以需要一块改成25.3.1，需要把-alpha1去掉，再重新编译就OK了

public class RecyclerViewActivity extends Activity implements View.OnClickListener {

    private Button btn_add;
    private Button btn_delete;
    private Button btn_list;
    private Button btn_grid;
    private Button btn_flow;
    private RecyclerView recyclerview;
    private TextView tv_title;

    private ArrayList<String> datas;
    private MyRecyclerViewAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView();

        initData();

        //设置RecyclerView的适配器
        adapter = new MyRecyclerViewAdapter(RecyclerViewActivity.this,datas);
        recyclerview.setAdapter(adapter);

        //LayoutManager，第三个参数表示是false正序，true逆序
        recyclerview.setLayoutManager(new LinearLayoutManager(RecyclerViewActivity.this, LinearLayoutManager.VERTICAL, false));
//        recyclerview.scrollToPosition(datas.size()-1);

        //添加RecyclerView的分割线
        recyclerview.addItemDecoration(new DividerListItemDecoration(RecyclerViewActivity.this,DividerListItemDecoration.VERTICAL_LIST));

        //设置点击某条的监听，自己实现需要的函数行为
        adapter.setOnItemClickListener(new MyRecyclerViewAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, String data) {
                Toast.makeText(RecyclerViewActivity.this, "data=="+data, Toast.LENGTH_SHORT).show();
            }
        });

        //设置动画
        recyclerview.setItemAnimator(new DefaultItemAnimator());

    }

    private void initData() {
        datas = new ArrayList<>();
        //准备数据集合
        for (int i=0;i<100;i++){
            datas.add("Content_"+i);
        }
    }

    private void initView() {
        setContentView(R.layout.activity_recyclerview);
        btn_add = (Button) findViewById(R.id.btn_add);
        btn_delete = (Button) findViewById(R.id.btn_delete);
        btn_list = (Button) findViewById(R.id.btn_list);
        btn_grid = (Button) findViewById(R.id.btn_grid);
        btn_flow = (Button) findViewById(R.id.btn_flow);
        recyclerview = (RecyclerView) findViewById(R.id.recyclerview);
        tv_title = (TextView) findViewById(R.id.tv_title);
        tv_title.setText("RecyclerView");

        //设置点击事件
        btn_add.setOnClickListener(this);
        btn_delete.setOnClickListener(this);
        btn_list.setOnClickListener(this);
        btn_grid.setOnClickListener(this);
        btn_flow.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn_add:
                adapter.addData(0,"New_Content");
                recyclerview.scrollToPosition(0);
                break;
            case R.id.btn_delete:
                adapter.removeData(0);
                break;
            case R.id.btn_list:
                //设置List类型效果
                recyclerview.setLayoutManager(new LinearLayoutManager(RecyclerViewActivity.this,LinearLayoutManager.VERTICAL,false));
                break;
            case R.id.btn_grid:
                //设置Grid类型效果
                recyclerview.setLayoutManager(new GridLayoutManager(RecyclerViewActivity.this, 2, GridLayoutManager.VERTICAL, false));
//                recyclerview.scrollToPosition(99);
                break;
            case R.id.btn_flow:
                //设置瀑布流类型效果
                recyclerview.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));
                break;
        }
    }
}

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


    private final Context context;
    private  ArrayList<String> datas;

    public MyRecyclerViewAdapter(Context context, ArrayList<String> datas) {
        this.context = context;
        this.datas = datas;
    }
/*******************设置viewholder，以及绑定数据start***************************/
    /**
     * 相当于于getView方法中创建View和ViewHolder
     * @param parent
     * @param viewType
     * @return
     */
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = View.inflate(context, R.layout.item_recyclerview,null);
        return new ViewHolder(itemView);
    }

    /**相当于于getView绑定数据部分的代码
     * 数据和View绑定
     * @param holder
     * @param position
     */
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        //根据位置得到对应的数据
        String  data  = datas.get(position);
        holder.tv_title.setText(data);

    }

    /**
     * 得到总条数
     * @return
     */
    @Override
    public int getItemCount() {
        return datas.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {

        private ImageView iv_icon;
        private TextView tv_title;

        public ViewHolder(View itemView) {
            super(itemView);
            iv_icon = (ImageView) itemView.findViewById(R.id.iv_icon);
            tv_title = (TextView) itemView.findViewById(R.id.tv_title);

            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
//                    Toast.makeText(context, "data=="+datas.get(getLayoutPosition()), Toast.LENGTH_SHORT).show();
                    //设置点击事件方法1，设置点击接口
                    if(onItemClickListener != null){
                        onItemClickListener.onItemClick(v,datas.get(getLayoutPosition()));
                    }
                }
            });

            //设置点击事件方然2，直接复写回调函数
            iv_icon.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(context, "我是图片=="+getLayoutPosition(), Toast.LENGTH_SHORT).show();
                }
            });
        }
    }
/*******************设置viewholder，以及绑定数据end***************************/
/*******************点击事件方法1自定义接口start***************************/
    /**
     * 点击RecyclerView某条的监听
     */
    public interface OnItemClickListener{
        /**
         * 当RecyclerView某个被点击的时候回调
         * @param view 点击item的视图
         * @param data 点击得到的数据
         */
        public void onItemClick(View view,String data);

    }

    private OnItemClickListener onItemClickListener;

    /**
     * 设置RecyclerView某个的监听
     * @param onItemClickListener
     */
    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }
/*******************点击事件方法1自定义接口end***************************/


    /**
     * 添加数据
     * @param position
     * @param data
     */
    public void addData(int position, String data) {
        datas.add(position,data);
        //刷新适配器
        notifyItemInserted(position);
    }

    /**
     * 移除数据
     * @param position
     */
    public void removeData(int position) {
        datas.remove(position);
        //刷新适配器
        notifyItemRemoved(position);
    }

}

自定义分割线样式

divider_bg    
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <gradient
        android:centerColor="#ff00ff00"
        android:endColor="#ff0000ff"
        android:startColor="#ffff0000"
        android:type="linear" />
    <size android:height="2dp"/>

</shape>

 

 

转载于:https://www.cnblogs.com/znsongshu/p/9383644.html