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精通RecyclerView：打造ListView、GridView、瀑布流；学会添加分割线、 添加删除动画 、Item点击事件
在上一篇Android用RecyclerView练手仿美团分类界面写了RecyclerView的基本用法，
今天想想，在这里重新学习一下RecyclerView的完整用法。包括如何打造一个普通的ListView和横向的ListView、普通的GridView和横向的GridView、如何添加分割线、
还有就是添加和删除的动画、以及如何设置Item的OnClick事件监听。这里包含了各种用法，也算是一个入门的用法，已经掌握的高手请略过。
先看总体效果图
一.RecyclerView介绍
RecyclerView 是Android 5.0版本中新出现的东西，用来替代ListView和GridView的。
二.RecyclerView架构
RecyclerView使用布局管理器LayoutManager和适配器Adapter的适配器模式去实现架构，不关心数据的来源。耦合性非常的底，用户可以根据自己的用户界面去实现相应的效果
三.RecyclerView的优点
- 1.RecyclerView内部已经强制使用VIewHolder，优化了对Item中View的复用。
- 2.提供了一个较为灵活的布局管理类，LayoutManager，用来控制RecyclerView是线性展示还是垂直展示，以及可以设置成瀑布流。并且提供了ItemDecoration这个类，来灵活的让用户来设置分割线。
- 3.用ItemAnimator可以对item进行布局的删减动画效果。
四.RecyclerView实现三部曲
- 第一步：设置布局管理器
用来确定每一个item如何进行排列摆放:
- LinearLayoutManager 相当于ListView的效果
- GridLayoutManager相当于GridView的效果
- StaggeredGridLayoutManager 瀑布流
- 第二步：添加分割线
我们用到了网上流传的万能分割线DividerItemDecoration和DividerGridItemDecoration，首先在style.xml里面定义分割线图片：
1.先在drawable中新建divider.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="@color/colorAccent"/>
<size android:height="1dp"
android:width="1dp"/>
</shape> 2.然后在style.xml中设置android:listDivider
<item name="android:listDivider">@drawable/divider</item>- 第三步：设置适配器
package cn.bluemobi.dylan.recyclerviewdemo2;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* RecyclerView的适配器
* Created by yuandl on 2016-11-01.
*/
public class RvAdapter extends RecyclerView.Adapter<RvAdapter.MyViewHolder> {
private Context context;
private List<Integer> datas;
/**
* item的点击事件的长按事件接口
*/
private OnItemClickListener onItemClickListener;
/**
* 瀑布流时的item随机高度
*/
private List<Integer> heights = new ArrayList<>();
/**
* 不同的类型设置item不同的高度
*
* @param type
*/
private int type = 0;
public RvAdapter(Context context, List<Integer> datas) {
this.context = context;
this.datas = datas;
for (int i : datas) {
int height = (int) (Math.random() * 100 + 300);
heights.add(height);
}
}
public void setType(int type) {
this.type = type;
}
/**
* 设置点击事件
*
* @param onItemClickListener
*/
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View contentView = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
MyViewHolder viewHolder = new MyViewHolder(contentView);
return viewHolder;
}
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
RecyclerView.LayoutParams layoutParams;
if (type == 0) {
layoutParams = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
} else if (type == 1) {
layoutParams = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
} else {
layoutParams = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, heights.get(position));
layoutParams.setMargins(2, 2, 2, 2);
}
holder.itemView.setLayoutParams(layoutParams);
holder.imageView.setImageResource(datas.get(position));
holder.tv.setText("分类" + position);
/**设置item点击监听**/
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (onItemClickListener != null) {
onItemClickListener.onItemClickListener(position, datas.get(position));
}
}
});
}
@Override
public int getItemCount() {
return datas == null ? 0 : datas.size();
}
/**
* 用于缓存的ViewHolder
*/
public class MyViewHolder extends RecyclerView.ViewHolder {
private ImageView imageView;
public TextView tv;
public MyViewHolder(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.iv);
tv = (TextView) itemView.findViewById(R.id.tv);
}
}
/**
* 设置item监听的接口
*/
public interface OnItemClickListener {
void onItemClickListener(int position, Integer data);
}
}
五.打造各种效果
- 1.竖向的ListView
rv.setBackgroundColor(Color.TRANSPARENT);
rv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
rvAdapter.setType(0);
rv.removeItemDecoration(itemDecoration);
rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST);
rv.addItemDecoration(itemDecoration);
- 2.横向的ListView
rvAdapter.setType(1);
rv.removeItemDecoration(itemDecoration);
rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
rv.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL_LIST);
rv.addItemDecoration(itemDecoration);
- 3.竖向的GridView
rvAdapter.setType(1);
rv.setBackgroundColor(Color.TRANSPARENT);
rv.removeItemDecoration(itemDecoration);
rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
rv.setLayoutManager(new GridLayoutManager(this, 5));
itemDecoration = new DividerGridItemDecoration(this);
rv.addItemDecoration(itemDecoration);
- 4.横向的GridView
rvAdapter.setType(1);
rv.setBackgroundColor(Color.TRANSPARENT);
rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
rv.removeItemDecoration(itemDecoration);
rv.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.HORIZONTAL));
itemDecoration = new DividerGridItemDecoration(this);
rv.addItemDecoration(itemDecoration);
- 5.竖向的瀑布流
rvAdapter.setType(3);
rv.setBackgroundColor(getResources().getColor(R.color.colorAccent));
rv.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
rv.removeItemDecoration(itemDecoration);
rv.setLayoutManager(new StaggeredGridLayoutManager(5, StaggeredGridLayoutManager.VERTICAL));
- 6.添加和删除动画
/**添加一个数据**/
rvAdapter.notifyItemInserted(1);
/**删除一个数据**/
rvAdapter.notifyItemRemoved(1);
六.GiHub
时间： 2024-08-27 14:50:57