Android高级UI开发 RecyclerView高级进阶（五）飞虎潜行极战之切换
【摘要】 RecyclerView控件还有一个非常方便的功能，就是可以动态改变RecyclerView控件的展示风格，即在列表与网格Grid布局之间自由切换，先上效果图《飞虎队剧照》：
一、核心代码如下：
1. MainActivity.java
package com.anyikang.volunteer.sos.recyclerview; import and...
RecyclerView控件还有一个非常方便的功能，就是可以动态改变RecyclerView控件的展示风格，即在列表与网格Grid布局之间自由切换，先上效果图《飞虎队剧照》：
一、核心代码如下：
1. MainActivity.java
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package com.anyikang.volunteer.sos.recyclerview;
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import android.app.Activity;
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import android.os.Bundle;
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import android.support.v7.widget.DefaultItemAnimator;
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import android.support.v7.widget.GridLayoutManager;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.view.View;
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import android.widget.Button;
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import android.widget.LinearLayout;
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import android.widget.Toast;
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public class MainActivity extends Activity {
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private RecyclerView recylerview; //RecyclerView控件实例对象
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//RecyclerView要显示的 列表数据，在此为一组字符串。
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private MyRecyclerAdapter adapter; //同ListView一样，需要一个适配器来 将list数据 装载到 RecyclerView列表控件。
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//private MyStaggedRecyclerAdapter adapter; //列表显示风格 为瀑布流 界面样式 的 适配器。
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boolean isGrid = true;
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Button btConvert;
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DividerGridViewItemDecoration mGridViewItemDecoration;
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MyListItemDecoration myListItemDecoration;
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private RecyclerView.ItemDecoration myItemDecoration;
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private int[] list= new int[]{
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R.drawable.fone,
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R.drawable.ftwo,
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R.drawable.fthree,
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R.drawable.ffour,
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R.drawable.ffive,
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R.drawable.fsix,
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R.drawable.fseven,
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R.drawable.feight,
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R.drawable.fnine,
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R.drawable.ften,
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R.drawable.feleven,
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R.drawable.ftwelve,
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R.drawable.thirteen
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};
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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initView();
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// initData();
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}
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/**
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* 初始化视图
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*/
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public void initView()
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{
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mGridViewItemDecoration = new DividerGridViewItemDecoration(MainActivity.this);
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myListItemDecoration = new MyListItemDecoration(MainActivity.this,LinearLayout.VERTICAL);
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btConvert = findViewById(R.id.btConvert);
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//实例化布局中的recylerview控件
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recylerview = (RecyclerView)findViewById(R.id.recylerview);
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//普通列表的适配器
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adapter = new MyRecyclerAdapter(list);
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//recylerview.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));//列表显示风格为 水平方向的列表
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//列表显示风格为 垂直方向的列表
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//recylerview.setLayoutManager(new LinearLayoutManager(this));
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//显示风格为网格，2列
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recylerview.setLayoutManager(new GridLayoutManager(this, 2));
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//装载显示列表数据
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myItemDecoration = new DividerGridViewItemDecoration(this);
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//recylerview.addItemDecoration(new MyListItemDecoration(this, LinearLayout.VERTICAL));
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recylerview.addItemDecoration(myItemDecoration);
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recylerview.setItemAnimator(new DefaultItemAnimator());
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adapter.setOnItemClickListener(new MyRecyclerAdapter.OnItemClickListener()
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{
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@Override
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public void onItemClick(View view, int position) {
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Toast.makeText(MainActivity.this, "点了"+position, Toast.LENGTH_SHORT).show();
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}
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});
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recylerview.setAdapter(adapter);
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btConvert.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View view) {
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if(myItemDecoration!=null)
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recylerview.removeItemDecoration(myItemDecoration);
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if(!isGrid){
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recylerview.setLayoutManager(new GridLayoutManager(MainActivity.this, 2));
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//recylerview.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false));//默认垂直
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myItemDecoration = new DividerGridViewItemDecoration(MainActivity.this);
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recylerview.addItemDecoration(myItemDecoration);
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}else{
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recylerview.setLayoutManager(new LinearLayoutManager(MainActivity.this,LinearLayout.VERTICAL,false));//默认垂直
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myItemDecoration = new MyListItemDecoration(MainActivity.this, LinearLayoutManager.VERTICAL);
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recylerview.addItemDecoration(myItemDecoration);
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}
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isGrid = !isGrid;
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}
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});
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return;
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}
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}
其中红色的代码，就是列表与网格布局切换的核心代码，这里值得注意的是以下代码：
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if(myItemDecoration!=null)
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recylerview.removeItemDecoration(myItemDecoration); 如果事先不移除的话，会出现分割线重复绘制
越来越粗
2. adapter适配器代码
MyRecyclerAdapter.java
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package com.anyikang.volunteer.sos.recyclerview;
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import android.support.v7.widget.RecyclerView;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerAdapter.MyViewHolder> {
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private int[] list;
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private OnItemClickListener mOnItemClickListener;
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public MyRecyclerAdapter(int[] list) {
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this.list = list;
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}
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class MyViewHolder extends RecyclerView.ViewHolder{
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ImageView imv;
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public MyViewHolder(View view) {
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super(view);
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imv = (ImageView)view.findViewById(R.id.imv);
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}
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}
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@Override
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public int getItemCount() {
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return list.length;
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}
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@Override
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public void onBindViewHolder(MyViewHolder holder, final int position) {
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holder.imv.setImageResource(list[position]);
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if(mOnItemClickListener!=null){
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holder.itemView.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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mOnItemClickListener.onItemClick(v, position);
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}
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});
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}
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}
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@Override
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public MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int arg1) {
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MyViewHolder holder = new MyViewHolder(View.inflate(viewGroup.getContext(), R.layout.list_item2, null));
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return holder;
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}
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/*public void addData(int position){
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list.add(position,"additem"+position);
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notifyItemInserted(position);
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}
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public void removeData(int position){
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list.remove(position);
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notifyItemRemoved(position);
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}*/
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public interface OnItemClickListener{
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void onItemClick(View view, int position);
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}
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public void setOnItemClickListener(OnItemClickListener listener){
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this.mOnItemClickListener = listener;
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}
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}
二、源码下载地址：
https://download.csdn.net/download/gaoxiaoweiandy/10409965
文章来源: blog.csdn.net，作者：冉航--小虾米，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/gaoxiaoweiandy/article/details/80291429
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