Android(安卓)- RecyclerView系列之小白篇
前言
本篇文章,其实很基础,也没什么难度,就是给自己查漏补缺,然后一点一点的积累,
目录
- 一:Adapter的写法
- 二:布局管理器
-
- LinearLayoutManager
-
- GridLayoutManager
-
- StaggeredGridLayoutManager
-
- 三:分割线
-
- 添加Android自带的分割线
-
- 自定义分割线
-
- 四:ItemAnimator
- 五:指定item的view
引用
compile 'com.android.support:recyclerview-v7:26.1.0'
一:Adapter的写法
之前记录过,请参考本篇文章
public class MyAdapter extends RecyclerView.Adapter { private ArrayList mData; public MyAdapter(ArrayList data) { this.mData = data; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_rv_item, parent, false); return new ViewHolder(v); } @Override public void onBindViewHolder(ViewHolder holder, int position) { holder.mTv.setText(mData.get(position)); } @Override public int getItemCount() { return mData == null ? 0 : mData.size(); } public static class ViewHolder extends RecyclerView.ViewHolder { TextView mTv; public ViewHolder(View itemView) { super(itemView); mTv = itemView.findViewById(R.id.item_tv); } }}
二:布局管理器
1. LinearLayoutManager
线性管理器,支持横向、纵向。
(1)竖向
//竖向mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);//横向mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);mRecyclerView.setLayoutManager(mLayoutManager);mRecyclerView.setAdapter(mAdapter);
LinearLayoutManager.VERTICAL 对应XML
<?xml version="1.0" encoding="utf-8"?>
(2)横向
LinearLayoutManager.HORIZONTAL<?xml version="1.0" encoding="utf-8"?>
2. GridLayoutManager
网格布局管理器
mLayoutManager = new GridLayoutManager(this, 4);mRecyclerView.setLayoutManager(mLayoutManager);
网格布局管理器 3. StaggeredGridLayoutManager
瀑布就式布局管理器
MyStageAdapter myStageAdapter = new MyStageAdapter(getData());mLayoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);mRecyclerView.setLayoutManager(mLayoutManager);mRecyclerView.setAdapter(myStageAdapter);
瀑布就式布局管理器 <?xml version="1.0" encoding="utf-8"?>
package com.allens.recyclerdemo;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.util.ArrayList;import java.util.List;/** * 描述: * * Created by allens on 2018/1/4. */public class MyStageAdapter extends RecyclerView.Adapter { private ArrayList mData; private List mHeights; public MyStageAdapter(ArrayList mData) { this.mData = mData; mHeights = new ArrayList(); for (int i = 0; i < mData.size(); i++) { mHeights.add((int) (100 + Math.random() * 300)); } } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_staggered_home, parent, false); return new ViewHolder(inflate); } @Override public void onBindViewHolder(ViewHolder holder, int position) { holder.mTv.setText(mData.get(position)); //设置高度 ViewGroup.LayoutParams lp = holder.mTv.getLayoutParams(); lp.height = mHeights.get(position); holder.mTv.setLayoutParams(lp); } @Override public int getItemCount() { return mData.size(); } public class ViewHolder extends RecyclerView.ViewHolder { TextView mTv; public ViewHolder(View itemView) { super(itemView); mTv = itemView.findViewById(R.id.id_num); } }}
三:分割线
1. 添加Android自带的分割线
mRcv.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
添加Android自带的分割线 2. 自定义分割线
打开DividerItemDecoration看看它的源码
/** * Sets the {@link Drawable} for this divider. * * @param drawable Drawable that should be used as a divider. */ public void setDrawable(@NonNull Drawable drawable) { if (drawable == null) { throw new IllegalArgumentException("Drawable cannot be null."); } mDivider = drawable; }
我们只需要调用这个方法,然后传入一个Drawable对象
<?xml version="1.0" encoding="utf-8"?>
//添加自定义分割线DividerItemDecoration divider = new DividerItemDecoration(this,DividerItemDecoration.VERTICAL);divider.setDrawable(ContextCompat.getDrawable(this,R.drawable.rcv_divider));mRcv.addItemDecoration(divider);
自定义分割线 当然还有一个继承ItemDecoration的方法可以实现,不过我感觉挺麻烦的,具体可以参考
张鸿洋 Android RecyclerView 使用完全解析 体验艺术般的控件
这个有很多东西后期我会写一遍专门讲分割线的文章,先欠着,哈哈
四:ItemAnimator
插入删除的动画效果
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
插入删除的动画效果 五:指定位置的view
View view = mLayoutManager.findViewByPosition(lastIndex);view.findViewById(R.id.item_left_title).setBackgroundColor(Color.WHITE);
参考
RecyclerView添加分割线的简便方法
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