Android Studio RecyclerView

RecyclerView三种布局
线性布局
网格布局
瀑布流

代码片段

主类

package com.example.day1.LinerLayout;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;

import com.example.day1.R;

import java.util.ArrayList;

public class Main2Activity extends AppCompatActivity {
    RecyclerView recycler;
    RVAdapter rvAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        recycler = findViewById(R.id.recycler);

        //线性布局
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
//        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
//        recycler.setLayoutManager(linearLayoutManager);
        //网格布局
        GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 2);
//      gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
//        recycler.setLayoutManager(gridLayoutManager);
        //瀑布流
        StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
        recycler.setLayoutManager(manager);
        //垂直排列
        DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
        dividerItemDecoration.setDrawable(getDrawable(R.drawable.recyc_divider));
        recycler.addItemDecoration(dividerItemDecoration);

        DefaultItemAnimator animator = new DefaultItemAnimator();
        animator.setRemoveDuration(200);
        animator.setAddDuration(200);
        //设置动画
        recycler.setItemAnimator(animator);

        final ArrayList<String> list = new ArrayList<>();
        for (int i = 1; i <= 100; i++) {
            list.add(i + "");
        }

        rvAdapter = new RVAdapter(Main2Activity.this, list, new recycLisnter() {
            @Override
            public void itemClick(int i) {
                list.remove(i);
                rvAdapter.notifyItemRemoved(i);
                //删除后更新下表
                rvAdapter.notifyItemRangeChanged(0, list.size());
            }

            @Override
            public void longClick(int i) {
                ArrayList<String> newList = new ArrayList<>();
                newList.add("A");
                newList.add("B");
                newList.add("C");
                list.addAll(i, newList);
                rvAdapter.notifyDataSetChanged();
            }
        });
        recycler.setAdapter(rvAdapter);
    }
}

适配器

package com.example.month3;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.RVHolder> {

    Context context;
    ArrayList<String> datas;
    recycLisnter recycLisnter;

    public RVAdapter(Context context, ArrayList<String> datas, com.example.month3.recycLisnter recycLisnter) {
        this.context = context;
        this.datas = datas;
        this.recycLisnter = recycLisnter;
    }

    @NonNull
    @Override
    public RVHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_recyc, viewGroup, false);
        return new RVHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RVHolder rvHolder, final int i) {
        rvHolder.textView.setText(datas.get(i));
        int random = (int) (Math.random() * 101 + 100);
        ViewGroup.LayoutParams params = rvHolder.textView.getLayoutParams();
        params.height = random;
        rvHolder.textView.setLayoutParams(params);
        rvHolder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                recycLisnter.itemClick(i);
            }
        });

        rvHolder.textView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                recycLisnter.longClick(i);
                return true;
            }
        });
    }

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

    class RVHolder extends RecyclerView.ViewHolder {

        private TextView textView;

        public RVHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text);
        }
    }
}

定义点击长按接口

public interface recycLisnter {
    void itemClick(int i);

    void longClick(int i);
}