RecycleView基础使用

第一步

在gradle中引入

implementation 'com.android.support:recyclerview-v7:27.1.1'

第二步

在布局文件中引入

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Three_chapter.RecyclerViewActivity">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</android.support.constraint.ConstraintLayout>

第三步

创建adapter

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<String> testDatas;

    public MyAdapter(List<String> testDatas) {
        this.testDatas = testDatas;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull final ViewGroup parent, int viewType) {
        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycle_item_layout, null, false);
        final ViewHolder viewHolder = new ViewHolder(inflate);
        // TODO: 2018/7/17 添加点击事件 
//        整个子item的点击事件  
        viewHolder.view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int adapterPosition = viewHolder.getAdapterPosition();
                Toast.makeText(parent.getContext(), "第" + adapterPosition + "子item的点击事件", Toast.LENGTH_SHORT).show();
            }
        });
        viewHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int adapterPosition = viewHolder.getAdapterPosition();
                Toast.makeText(parent.getContext(), "第" + adapterPosition + "位置子item里面的一个控件的点击事件", Toast.LENGTH_SHORT).show();
            }
        });
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.textView.setText(testDatas.get(position));
    }

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

    static class ViewHolder extends RecyclerView.ViewHolder {
        View view;
        TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            view = itemView;
            textView = itemView.findViewById(R.id.text);
        }
    }
}

第四步

使用

public class RecyclerViewActivity extends AppCompatActivity {

    private RecyclerView mRecycleview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycler_view);
        initView();
    }

    private void initView() {
//        实例化RecyclerView
        mRecycleview = ((RecyclerView) findViewById(R.id.recycler));
       /** 创建一个布局排列管理者，LinearLayoutManager，GridLayoutManager，StaggeredGridLayoutManager
        *  LinearLayoutManager为线性布局，可以横向也可以纵向
        *  GridLayoutManager为网格布局
        *  StaggeredGridLayoutManager瀑布流布局
        *  GridLayoutManager manager1 = new GridLayoutManager(this, 3);
        *  StaggeredGridLayoutManager manager2 = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
        **/
        LinearLayoutManager manager = new LinearLayoutManager(this);
        manager.setOrientation(LinearLayoutManager.HORIZONTAL);
//        设置布局
        mRecycleview.setLayoutManager(manager);
//        实例化adapter
        MyAdapter myAdapter = new MyAdapter(initDatas());
//        设置adapter
        mRecycleview.setAdapter(myAdapter);
    }

    private List<String> initDatas() {
        List<String> strings = new ArrayList<>();
        strings.add("234567890");
        strings.add("23456789023456789");
        strings.add("234567890dfg");
        strings.add("234567890wert");
        strings.add("234567890fdg");
        strings.add("234567890afgolploiuytgrf");
        strings.add("234567890fgmkvf");
        strings.add("234567890q67u");
        strings.add("234567890rfgthyjuikokiubvcdvbnmnbgv");
        strings.add("234567890rty7ytvbyujybgv");
        return strings;
    }
}