由于最近写的一个项目里边有关于列表的修正相关的功用，其实也是类似于腾讯视频的观看历史的列表操作，你可以先尝试一下，写这个主要是事务逻辑要明晰，否则你很简单就会陷进去，走死胡同的。
作用图如下：
源码如下： RecyclerViewUseDemo
刻不容缓想要自己运行在AS中的小伙伴可以直接下载或者克隆，打开即可，想了解具体开发流程和具体的事务逻辑的小伙伴，可以持续往下看，本章很长，请在流量和时刻足够的前提下观看，如有问题，谈论即可，我会赶快解决，多说无益，开搞~
开发
① 新建项目
这一步没有什么好说的，点击项目创立
② 装备build.gradle
第一步 在工程等级的build.gradle文件中的allprojects{} 闭包中添加maven库
maven { url "https://jitpack.io" }
第二步 在项目等级的build.gradle文件中的android{}闭包中，装备JDK的版本
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
然后在dependencies{}闭包中添加第三方的依赖库
//绑定视图
implementation 'com.jakewharton:butterknife:10.2.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:10.2.1'
//RecyclerView
implementation 'androidx.recyclerview:recyclerview:1.1.0'
//下拉改写
implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0-alpha-14'
//RecyclerView适配器
implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.22'
//抢手强壮的图片加载器
implementation 'com.github.bumptech.glide:glide:4.9.0'
③ 修正布局
在此之前，为了添加点击作用，在res → drawable 下创立rounded_corners.xml文件 代码如下：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<solid android:color="#18ffc400"/>
</shape>
</item>
<item android:state_focused="true" android:state_enabled="true">
<shape android:shape="rectangle">
<solid android:color="#0f000000"/>
</shape>
</item>
</selector>
然后在res下新建一个drawable-v21的文件夹，在文件夹中创立bg_white.xml文件，代码如下：
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#20000000"
android:drawable="@drawable/rounded_corners"/>
在drawable文件下再创立一个shape_blue_bg_5.xml 代码如下：
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="5dp"/>
<solid android:color="#101B53"/>
</shape>
然后是修正values文件夹下的colors.xml文件，修正原来的并添加几个颜色,
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#1F2B5D</color>
<color name="colorPrimaryDark">#1F2B5D</color>
<color name="colorAccent">#D81B60</color>
<color name="default_color">#48558C</color>
<color name="selected_color">#009FE8</color>
<color name="app_color">#1F2B5D</color>
<color name="app_bg_color">#020C49</color>
<color name="white">#FFFFFF</color>
<color name="gray">#8A96A3</color>
<color name="yellow">#F39700</color>
</resources>
再修正一下styles.xml文件
icon_normal.png
icon_choose_default.png
修正activity_main.xml文件，修正后如下图所示
代码如下，复制粘贴即可：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:background="@color/app_bg_color"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<!--头部-->
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="RecyclerView Demo"
android:textColor="@color/white"
android:textSize="18sp" />
<TextView
android:id="@+id/tv_edit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginRight="8dp"
android:padding="8dp"
android:text="修正"
android:textColor="@color/white"
android:textSize="16sp" />
</androidx.appcompat.widget.Toolbar>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/toolbar"
android:layout_above="@+id/lay_bottom">
<!--无数据时的布局-->
<LinearLayout
android:id="@+id/rv_normal_show"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:layout_width="264dp"
android:layout_height="140dp"
android:background="@mipmap/icon_normal" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/dp_10"
android:text="空空如也"
android:textColor="@color/gray"
android:textSize="18sp" />
</LinearLayout>
<!--没有数据时，下拉从头添加数据-->
<com.scwang.smartrefresh.layout.SmartRefreshLayout
android:id="@+id/refresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--展现数据的列表-->
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="12dp"
android:visibility="gone" />
</com.scwang.smartrefresh.layout.SmartRefreshLayout>
</RelativeLayout>
<!--底部-->
<LinearLayout
android:id="@+id/lay_bottom"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:background="@color/colorPrimary"
android:orientation="horizontal"
android:visibility="gone">
<TextView
android:id="@+id/tv_check_all"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:foreground="@drawable/bg_white"
android:gravity="center"
android:text="全选"
android:textColor="@color/white"
android:textSize="@dimen/sp_14" />
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_marginTop="12dp"
android:layout_marginBottom="12dp"
android:background="@color/app_bg_color" />
<TextView
android:id="@+id/tv_delete"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:foreground="@drawable/bg_white"
android:gravity="center"
android:text="删去"
android:textColor="@color/yellow"
android:textSize="14sp" />
</LinearLayout>
</RelativeLayout>
然后是创立一个数据实体DataResponse.java
代码如下，复制粘贴即可：
package com.llw.recyclerviewusedemo;
import java.util.List;
/**
* 数据实体
*/
public class DataResponse {
/**
* data : [{"_id":"5e959250808d6d2fe6b56eda","author":"鸢媛","category":"Girl","createdAt":"2020-05-25 08:00:00","desc":"与其安慰自己普通可贵，\n不如拼尽全力活得美丽。 \u200b \u200b\u200b\u200b\u200b","images":["http://gank.io/images/f4f6d68bf30147e1bdd4ddbc6ad7c2a2"],"likeCounts":0,"publishedAt":"2020-05-25 08:00:00","stars":1,"title":"第96期","type":"Girl","url":"http://gank.io/images/f4f6d68bf30147e1bdd4ddbc6ad7c2a2","views":131},{"_id":"5e95923f808d6d2fe6b56ed8","author":"鸢媛","category":"Girl","createdAt":"2020-05-24 08:00:00","desc":"这世界总有人在笨拙地爱着你，想把悉数的温柔都给你。 \u200b\u200b\u200b\u200b","images":["http://gank.io/images/dc75cbde1d98448183e2f9514b4d1320"],"likeCounts":0,"publishedAt":"2020-05-24 08:00:00","stars":1,"title":"第95期","type":"Girl","url":"http://gank.io/images/dc75cbde1d98448183e2f9514b4d1320","views":133},{"_id":"5e95922e808d6d2fe6b56ed6","author":"鸢媛","category":"Girl","createdAt":"2020-05-23 08:00:00","desc":"陪伴原本便是这世界上最了不得的安慰\u200b。","images":["http://gank.io/images/6b2efa591564475fb8bc32291fb0007c"],"likeCounts":0,"publishedAt":"2020-05-23 08:00:00","stars":1,"title":"第94期","type":"Girl","url":"http://gank.io/images/6b2efa591564475fb8bc32291fb0007c","views":135},{"_id":"5e959200ee6ba981da2af34d","author":"鸢媛","category":"Girl","createdAt":"2020-05-22 08:00:00","desc":"长不过执念，短不过善变。","images":["http://gank.io/images/d6bba8cf5b8c40f9ad229844475e9149"],"likeCounts":0,"publishedAt":"2020-05-22 08:00:00","stars":1,"title":"第93期","type":"Girl","url":"http://gank.io/images/d6bba8cf5b8c40f9ad229844475e9149","views":192},{"_id":"5e9591dcee6ba981da2af34b","author":"鸢媛","category":"Girl","createdAt":"2020-05-21 08:00:00","desc":"无论多么艰难的现在，终会翻篇。\n朝未来大步向前吧，别丧，别停步。","images":["http://gank.io/images/9fa43020cf724c69842eec3e13f6d21c"],"likeCounts":1,"publishedAt":"2020-05-21 08:00:00","stars":1,"title":"第92期","type":"Girl","url":"http://gank.io/images/9fa43020cf724c69842eec3e13f6d21c","views":176},{"_id":"5e9591c60bd5529b54e712af","author":"鸢媛","category":"Girl","createdAt":"2020-05-20 08:00:00","desc":"期望下一次，能喜欢上一个也喜欢自己的人 \u200b\u200b\u200b\u200b。","images":["http://gank.io/images/d237f507bf1946d2b0976e581f8aab9b"],"likeCounts":0,"publishedAt":"2020-05-20 08:00:00","stars":1,"title":"第91期","type":"Girl","url":"http://gank.io/images/d237f507bf1946d2b0976e581f8aab9b","views":180},{"_id":"5e9591b6808d6d2fe6b56ed5","author":"鸢媛","category":"Girl","createdAt":"2020-05-19 08:00:00","desc":"这个世界上，\n有些人有多冷漠，\n有些人就有多温暖，\n期望你总会遇到那些温暖对你的人。","images":["http://gank.io/images/25d3e3db2c1248bb917c09dc4f50a46f"],"likeCounts":0,"publishedAt":"2020-05-19 08:00:00","stars":1,"title":"第90期","type":"Girl","url":"http://gank.io/images/25d3e3db2c1248bb917c09dc4f50a46f","views":255},{"_id":"5e9591a2ee6ba981da2af34a","author":"鸢媛","category":"Girl","createdAt":"2020-05-18 08:00:00","desc":"以前对你的喜欢，\n是见你，念你，陪伴你。\n现在对你的喜欢，\n是不问，不看，不叨扰。","images":["http://gank.io/images/19c99c447e0a40a6b3ff89951957cfb1"],"likeCounts":0,"publishedAt":"2020-05-18 08:00:00","stars":1,"title":"第89期","type":"Girl","url":"http://gank.io/images/19c99c447e0a40a6b3ff89951957cfb1","views":240},{"_id":"5e959197808d6d2fe6b56ed4","author":"鸢媛","category":"Girl","createdAt":"2020-05-17 08:00:00","desc":"只要结局是喜剧，进程你要我怎么哭都行，幸福可以来的慢一些，\n只要它是真的，如果最后能在一起，晚点我真的无所谓的。","images":["http://gank.io/images/f0c192e3e335400db8a709a07a891b2e"],"likeCounts":0,"publishedAt":"2020-05-17 08:00:00","stars":1,"title":"第88期","type":"Girl","url":"http://gank.io/images/f0c192e3e335400db8a709a07a891b2e","views":275},{"_id":"5e95915f808d6d2fe6b56ed3","author":"鸢媛","category":"Girl","createdAt":"2020-05-16 08:00:00","desc":"若不是情深似海，怀念又怎会泛滥成灾。","images":["http://gank.io/images/bdb35e4b3c0045c799cc7a494a3db3e0"],"likeCounts":0,"publishedAt":"2020-05-16 08:00:00","stars":1,"title":"第87期","type":"Girl","url":"http://gank.io/images/bdb35e4b3c0045c799cc7a494a3db3e0","views":437}]
* page : 1
* page_count : 10
* status : 100
* total_counts : 96
*/
private int page;
private int page_count;
private int status;
private int total_counts;
private List<DataBean> data;
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getPage_count() {
return page_count;
}
public void setPage_count(int page_count) {
this.page_count = page_count;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public int getTotal_counts() {
return total_counts;
}
public void setTotal_counts(int total_counts) {
this.total_counts = total_counts;
}
public List<DataBean> getData() {
return data;
}
public void setData(List<DataBean> data) {
this.data = data;
}
public static class DataBean {
/**
* _id : 5e959250808d6d2fe6b56eda
* author : 鸢媛
* category : Girl
* createdAt : 2020-05-25 08:00:00
* desc : 与其安慰自己普通可贵，
不如拼尽全力活得美丽。
* images : ["http://gank.io/images/f4f6d68bf30147e1bdd4ddbc6ad7c2a2"]
* likeCounts : 0
* publishedAt : 2020-05-25 08:00:00
* stars : 1
* title : 第96期
* type : Girl
* url : http://gank.io/images/f4f6d68bf30147e1bdd4ddbc6ad7c2a2
* views : 131
*/
private String _id;
private String author;
private String category;
private String createdAt;
private String desc;
private int likeCounts;
private String publishedAt;
private int stars;
private String title;
private String type;
private String url;
private int views;
private List<String> images;
private boolean select = false;
public String get_id() {
return _id;
}
public void set_id(String _id) {
this._id = _id;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getCreatedAt() {
return createdAt;
}
public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public int getLikeCounts() {
return likeCounts;
}
public void setLikeCounts(int likeCounts) {
this.likeCounts = likeCounts;
}
public String getPublishedAt() {
return publishedAt;
}
public void setPublishedAt(String publishedAt) {
this.publishedAt = publishedAt;
}
public int getStars() {
return stars;
}
public void setStars(int stars) {
this.stars = stars;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public int getViews() {
return views;
}
public void setViews(int views) {
this.views = views;
}
public List<String> getImages() {
return images;
}
public void setImages(List<String> images) {
this.images = images;
}
public boolean isSelect() {
return select;
}
public void setSelect(boolean select) {
this.select = select;
}
}
}
再创立一个JsonData.java，存放用于转换的JSON数据
代码如下，复制粘贴即可：
package com.llw.recyclerviewusedemo;
public class JsonData {
public static String JSON = "{\"data\":[{\"_id\":\"5e959250808d6d2fe6b56eda\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-25 08:00:00\",\"desc\":\"\\u4e0e\\u5176\\u5b89\\u6170\\u81ea\\u5df1\\u5e73\\u51e1\\u53ef\\u8d35\\uff0c\\n\\u4e0d\\u5982\\u62fc\\u5c3d\\u5168\\u529b\\u6d3b\\u5f97\\u6f02\\u4eae\\u3002 \\u200b \\u200b\\u200b\\u200b\\u200b\",\"images\":[\"http://gank.io/images/f4f6d68bf30147e1bdd4ddbc6ad7c2a2\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-25 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c96\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/f4f6d68bf30147e1bdd4ddbc6ad7c2a2\",\"views\":131},{\"_id\":\"5e95923f808d6d2fe6b56ed8\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-24 08:00:00\",\"desc\":\"\\u8fd9\\u4e16\\u754c\\u603b\\u6709\\u4eba\\u5728\\u7b28\\u62d9\\u5730\\u7231\\u7740\\u4f60\\uff0c\\u60f3\\u628a\\u5168\\u90e8\\u7684\\u6e29\\u67d4\\u90fd\\u7ed9\\u4f60\\u3002 \\u200b\\u200b\\u200b\\u200b\",\"images\":[\"http://gank.io/images/dc75cbde1d98448183e2f9514b4d1320\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-24 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c95\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/dc75cbde1d98448183e2f9514b4d1320\",\"views\":133},{\"_id\":\"5e95922e808d6d2fe6b56ed6\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-23 08:00:00\",\"desc\":\"\\u966a\\u4f34\\u672c\\u6765\\u5c31\\u662f\\u8fd9\\u4e16\\u754c\\u4e0a\\u6700\\u4e86\\u4e0d\\u8d77\\u7684\\u5b89\\u6170\\u200b\\u3002\",\"images\":[\"http://gank.io/images/6b2efa591564475fb8bc32291fb0007c\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-23 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c94\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/6b2efa591564475fb8bc32291fb0007c\",\"views\":135},{\"_id\":\"5e959200ee6ba981da2af34d\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-22 08:00:00\",\"desc\":\"\\u957f\\u4e0d\\u8fc7\\u6267\\u5ff5\\uff0c\\u77ed\\u4e0d\\u8fc7\\u5584\\u53d8\\u3002\",\"images\":[\"http://gank.io/images/d6bba8cf5b8c40f9ad229844475e9149\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-22 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c93\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/d6bba8cf5b8c40f9ad229844475e9149\",\"views\":192},{\"_id\":\"5e9591dcee6ba981da2af34b\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-21 08:00:00\",\"desc\":\"\\u65e0\\u8bba\\u591a\\u4e48\\u8270\\u96be\\u7684\\u73b0\\u5728\\uff0c\\u7ec8\\u4f1a\\u7ffb\\u7bc7\\u3002\\n\\u671d\\u672a\\u6765\\u5927\\u6b65\\u5411\\u524d\\u5427\\uff0c\\u522b\\u4e27\\uff0c\\u522b\\u6b62\\u6b65\\u3002\",\"images\":[\"http://gank.io/images/9fa43020cf724c69842eec3e13f6d21c\"],\"likeCounts\":1,\"publishedAt\":\"2020-05-21 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c92\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/9fa43020cf724c69842eec3e13f6d21c\",\"views\":176},{\"_id\":\"5e9591c60bd5529b54e712af\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-20 08:00:00\",\"desc\":\"\\u5e0c\\u671b\\u4e0b\\u4e00\\u6b21\\uff0c\\u80fd\\u559c\\u6b22\\u4e0a\\u4e00\\u4e2a\\u4e5f\\u559c\\u6b22\\u81ea\\u5df1\\u7684\\u4eba \\u200b\\u200b\\u200b\\u200b\\u3002\",\"images\":[\"http://gank.io/images/d237f507bf1946d2b0976e581f8aab9b\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-20 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c91\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/d237f507bf1946d2b0976e581f8aab9b\",\"views\":180},{\"_id\":\"5e9591b6808d6d2fe6b56ed5\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-19 08:00:00\",\"desc\":\"\\u8fd9\\u4e2a\\u4e16\\u754c\\u4e0a\\uff0c\\n\\u6709\\u4e9b\\u4eba\\u6709\\u591a\\u51b7\\u6f20\\uff0c\\n\\u6709\\u4e9b\\u4eba\\u5c31\\u6709\\u591a\\u6e29\\u6696\\uff0c\\n\\u5e0c\\u671b\\u4f60\\u603b\\u4f1a\\u9047\\u5230\\u90a3\\u4e9b\\u6e29\\u6696\\u5bf9\\u4f60\\u7684\\u4eba\\u3002\",\"images\":[\"http://gank.io/images/25d3e3db2c1248bb917c09dc4f50a46f\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-19 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c90\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/25d3e3db2c1248bb917c09dc4f50a46f\",\"views\":255},{\"_id\":\"5e9591a2ee6ba981da2af34a\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-18 08:00:00\",\"desc\":\"\\u4ee5\\u524d\\u5bf9\\u4f60\\u7684\\u559c\\u6b22\\uff0c\\n\\u662f\\u89c1\\u4f60\\uff0c\\u5ff5\\u4f60\\uff0c\\u966a\\u4f34\\u4f60\\u3002\\n\\u73b0\\u5728\\u5bf9\\u4f60\\u7684\\u559c\\u6b22\\uff0c\\n\\u662f\\u4e0d\\u95ee\\uff0c\\u4e0d\\u770b\\uff0c\\u4e0d\\u53e8\\u6270\\u3002\",\"images\":[\"http://gank.io/images/19c99c447e0a40a6b3ff89951957cfb1\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-18 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c89\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/19c99c447e0a40a6b3ff89951957cfb1\",\"views\":240},{\"_id\":\"5e959197808d6d2fe6b56ed4\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-17 08:00:00\",\"desc\":\"\\u53ea\\u8981\\u7ed3\\u5c40\\u662f\\u559c\\u5267\\uff0c\\u8fc7\\u7a0b\\u4f60\\u8981\\u6211\\u600e\\u4e48\\u54ed\\u90fd\\u884c\\uff0c\\u5e78\\u798f\\u53ef\\u4ee5\\u6765\\u7684\\u6162\\u4e00\\u4e9b\\uff0c\\n\\u53ea\\u8981\\u5b83\\u662f\\u771f\\u7684\\uff0c\\u5982\\u679c\\u6700\\u540e\\u80fd\\u5728\\u4e00\\u8d77\\uff0c\\u665a\\u70b9\\u6211\\u771f\\u7684\\u65e0\\u6240\\u8c13\\u7684\\u3002\",\"images\":[\"http://gank.io/images/f0c192e3e335400db8a709a07a891b2e\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-17 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c88\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/f0c192e3e335400db8a709a07a891b2e\",\"views\":275},{\"_id\":\"5e95915f808d6d2fe6b56ed3\",\"author\":\"\\u9e22\\u5a9b\",\"category\":\"Girl\",\"createdAt\":\"2020-05-16 08:00:00\",\"desc\":\"\\u82e5\\u4e0d\\u662f\\u60c5\\u6df1\\u4f3c\\u6d77\\uff0c\\u601d\\u5ff5\\u53c8\\u600e\\u4f1a\\u6cdb\\u6ee5\\u6210\\u707e\\u3002\",\"images\":[\"http://gank.io/images/bdb35e4b3c0045c799cc7a494a3db3e0\"],\"likeCounts\":0,\"publishedAt\":\"2020-05-16 08:00:00\",\"stars\":1,\"title\":\"\\u7b2c87\\u671f\",\"type\":\"Girl\",\"url\":\"http://gank.io/images/bdb35e4b3c0045c799cc7a494a3db3e0\",\"views\":437}],\"page\":1,\"page_count\":10,\"status\":100,\"total_counts\":96}";
}
④ 创立列表的item布局文件
在layout文件下创立item_data_list.xml布局文件
代码如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="12dp"
android:orientation="vertical">
<LinearLayout
android:id="@+id/item_data"
android:foreground="@drawable/bg_white"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/shape_blue_bg_5"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="12dp">
<ImageView
android:id="@+id/iv_check"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_marginRight="12dp"
android:background="@mipmap/icon_choose_default"
android:button="@null" />
<ImageView
android:id="@+id/iv_img"
android:layout_width="150dp"
android:layout_height="200dp"
android:background="@drawable/ic_launcher_background"
android:scaleType="centerCrop" />
<TextView
android:id="@+id/tv_video_info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:text="测试数据"
android:textColor="@color/white"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>
⑤ 列表适配器
创立一个适配器DataAdapter.java
代码如下：
package com.llw.recyclerviewusedemo;
import android.view.View;
import android.widget.ImageView;
import androidx.annotation.Nullable;
import com.bumptech.glide.Glide;
import com.chad.library.adapter.base.BaseQuickAdapter;
import com.chad.library.adapter.base.BaseViewHolder;
import java.util.List;
/**
* 适配器
*/
public class DataAdapter extends BaseQuickAdapter<DataResponse.DataBean, BaseViewHolder> {
private static final int STATE_DEFAULT = 0;//默许状况
int mEditMode = STATE_DEFAULT;
public DataAdapter(int layoutResId, @Nullable List<DataResponse.DataBean> data) {
super(layoutResId, data);
}
@Override
protected void convert(BaseViewHolder helper, DataResponse.DataBean item) {
//Glide加载网络图片
Glide.with(mContext).load(item.getUrl()).into((ImageView) helper.getView(R.id.iv_img));
//TextView赋值
helper.setText(R.id.tv_video_info, item.getAuthor());
helper.addOnClickListener(R.id.item_data);//添加item点击事情
if (mEditMode == STATE_DEFAULT) {
//默许不显现
helper.getView(R.id.iv_check).setVisibility(View.GONE);
} else {
//显现 显现之后再做点击之后的判别
helper.getView(R.id.iv_check).setVisibility(View.VISIBLE);
if (item.isSelect()) {//点击时，true 选中
helper.getView(R.id.iv_check).setBackgroundResource(R.mipmap.icon_choose_selected);
} else {//false 撤销选中
helper.getView(R.id.iv_check).setBackgroundResource(R.mipmap.icon_choose_default);
}
}
}
/**
* 设置修正状况 接纳Activity中传递的值，并改动Adapter的状况
*/
public void setEditMode(int editMode) {
mEditMode = editMode;
notifyDataSetChanged();//改写
}
}
⑥ 主要逻辑编写
进入到MainActivity.java
这儿绑定一些控件并声明一些需要用到的变量
初始化列表数据
//初始化列表数据
private void initList() {
mAdapter = new DataAdapter(R.layout.item_data_list, mList);//绑定视图和数据
rv.setLayoutManager(new LinearLayoutManager(this));//设置线性布局管理器
rv.setAdapter(mAdapter);//设置适配器
Gson gson = new Gson();
DataResponse dataBean = gson.fromJson(JsonData.JSON, DataResponse.class);//解析数据
List<DataResponse.DataBean> resultsBeans = dataBean.getData();
if (resultsBeans.size() > 0) {
mList.clear();
mList.addAll(resultsBeans);
mAdapter.notifyDataSetChanged();//改写数据
rv.setVisibility(View.VISIBLE);
rvNormalShow.setVisibility(View.GONE);
} else {
rv.setVisibility(View.GONE);
rvNormalShow.setVisibility(View.VISIBLE);
}
refresh.finishRefresh();//数据加载出来之后，完毕下拉动作
}
处理点击事情
//页面的点击事情
@OnClick({R.id.tv_edit, R.id.tv_check_all, R.id.tv_delete})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.tv_edit://修正
updateEditState();
break;
case R.id.tv_check_all://全选
setAllItemChecked();
break;
case R.id.tv_delete://删去
deleteCheckItem();
break;
}
}
改动修正状况
//改动修正状况
private void updateEditState() {
mEditMode = mEditMode == STATE_DEFAULT ? STATE_EDIT : STATE_DEFAULT;
if (mEditMode == STATE_EDIT) {
tvEdit.setText("撤销");
layBottom.setVisibility(View.VISIBLE);
editorStatus = true;//处于修正状况
} else {
tvEdit.setText("修正");
layBottom.setVisibility(View.GONE);
editorStatus = false;//处于默许状况
setAllItemUnchecked();//撤销全选
}
mAdapter.setEditMode(mEditMode);//改写Adapter
mAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {
@Override
public void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {
if (editorStatus) {//修正状况
DataResponse.DataBean dataBean = mList.get(position);//赋值
boolean isSelect = dataBean.isSelect();
if (!isSelect) {
index++;
dataBean.setSelect(true);
} else {
dataBean.setSelect(false);
index--;
}
if (index == 0) {//当时选中item数量
tvDelete.setText("删去");
} else {
tvDelete.setText("删去(" + index + ")");
}
mAdapter.notifyDataSetChanged();
}
}
});
}
悉数选中
//悉数选中
private void setAllItemChecked() {
if (mAdapter == null) return;
for (int i = 0; i < mList.size(); i++) {
mList.get(i).setSelect(true);
}
mAdapter.notifyDataSetChanged();
index = mList.size();
tvDelete.setText("删去(" + index + ")");
}
撤销悉数选中
//撤销悉数选中
private void setAllItemUnchecked() {
if (mAdapter == null) return;
for (int i = 0; i < mList.size(); i++) {
mList.get(i).setSelect(false);
}
mAdapter.notifyDataSetChanged();
tvDelete.setText("删去");
index = 0;
}
删去选中的item
//删去选中的item
private void deleteCheckItem() {
if (mAdapter == null) return;
for (int i = mList.size() - 1; i >= 0; i--) {
if (mList.get(i).isSelect() == true) {
mList.remove(i);
}
}
//删去选中的item之后判别是否还有数据，没有则退出修正形式
if (mList.size() != 0) {
index = 0;//删去之后置为0
tvDelete.setText("删去");
}else {
tvEdit.setText("修正");
layBottom.setVisibility(View.GONE);
editorStatus = false;
//没有数据天然也不存在修正了
tvEdit.setVisibility(View.GONE);
rvNormalShow.setVisibility(View.VISIBLE);
//启用下拉
refresh.setEnableRefresh(true);
//下拉改写
refresh.setOnRefreshListener(refreshLayout -> {
//从头装填数据
initList();
mEditMode = STATE_DEFAULT;//康复默许状况
editorStatus = false;//康复默许状况
tvEdit.setVisibility(View.VISIBLE);//显现修正
});
}
mAdapter.notifyDataSetChanged();//改写
}
最后在onCreate()办法中运用
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
initList();
//禁用下拉和上拉
refresh.setEnableRefresh(false);
refresh.setEnableLoadMore(false);
}
做完这些基本上功用就现已都实现了，下面便是锦上添花了，添加动画作用，
⑦ 添加动画作用
列表的出现动画，在res下创立一个anim文件夹，这下面有两个xml文件
<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation
xmlns:android="http://schemas.android.com/apk/res/android"
android:animation="@anim/item_animation_from_bottom"
android:delay="15%"
android:animationOrder="normal"
/>
item_animation_from_bottom.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="500">
<translate
android:fromYDelta="50%p"
android:interpolator="@android:anim/accelerate_decelerate_interpolator"
android:toYDelta="0" />
<alpha
android:fromAlpha="0"
android:interpolator="@android:anim/accelerate_decelerate_interpolator"
android:toAlpha="1" />
</set>
然后创立一个动画类RecyclerViewAnimation.java，用来运用
代码如下：
package com.llw.recyclerviewusedemo;
import android.content.Context;
import android.view.animation.AnimationUtils;
import android.view.animation.LayoutAnimationController;
import androidx.recyclerview.widget.RecyclerView;
/**
* RecyclerView动画
*/
public class RecyclerViewAnimation {
//数据变化时显现动画
public static void runLayoutAnimation(final RecyclerView recyclerView) {
final Context context = recyclerView.getContext();
final LayoutAnimationController controller =
AnimationUtils.loadLayoutAnimation(context, R.anim.layout_animation_from_bottom);
recyclerView.setLayoutAnimation(controller);
recyclerView.getAdapter().notifyDataSetChanged();
recyclerView.scheduleLayoutAnimation();
}
}
运用办法
import static com.llw.recyclerviewusedemo.RecyclerViewAnimation.runLayoutAnimation;//导入
MainActivity.java完好代码
package com.llw.recyclerviewusedemo;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.chad.library.adapter.base.BaseQuickAdapter;
import com.google.gson.Gson;
import com.scwang.smartrefresh.layout.SmartRefreshLayout;
import java.util.ArrayList;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import static com.llw.recyclerviewusedemo.RecyclerViewAnimation.runLayoutAnimation;
public class MainActivity extends AppCompatActivity {
@BindView(R.id.tv_edit)
TextView tvEdit;//修正
@BindView(R.id.rv_normal_show)
LinearLayout rvNormalShow;//没有数据时展现的布局
@BindView(R.id.rv)
RecyclerView rv;//列表
@BindView(R.id.refresh)
SmartRefreshLayout refresh;//改写布局
@BindView(R.id.tv_check_all)
TextView tvCheckAll;//全选
@BindView(R.id.tv_delete)
TextView tvDelete;//删去
@BindView(R.id.lay_bottom)
LinearLayout layBottom;//底部布局
private static final int STATE_DEFAULT = 0;//默许状况
private static final int STATE_EDIT = 1;//修正状况
private int mEditMode = STATE_DEFAULT;
private boolean editorStatus = false;//是否为修正状况
private int index = 0;//当时选中的item数
List<DataResponse.DataBean> mList = new ArrayList<>();//列表
DataAdapter mAdapter;//适配器
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
initList();
//禁用下拉和上拉
refresh.setEnableRefresh(false);
refresh.setEnableLoadMore(false);
}
//初始化列表数据
private void initList() {
mAdapter = new DataAdapter(R.layout.item_data_list, mList);//绑定视图和数据
rv.setLayoutManager(new LinearLayoutManager(this));//设置线性布局管理器
rv.setAdapter(mAdapter);//设置适配器
Gson gson = new Gson();
DataResponse dataBean = gson.fromJson(JsonData.JSON, DataResponse.class);//解析数据
List<DataResponse.DataBean> resultsBeans = dataBean.getData();
if (resultsBeans.size() > 0) {
mList.clear();
mList.addAll(resultsBeans);
mAdapter.notifyDataSetChanged();//改写数据
runLayoutAnimation(rv);//动画显现
rv.setVisibility(View.VISIBLE);
rvNormalShow.setVisibility(View.GONE);
} else {
rv.setVisibility(View.GONE);
rvNormalShow.setVisibility(View.VISIBLE);
}
refresh.finishRefresh();//数据加载出来之后，完毕下拉动作
}
//页面的点击事情
@OnClick({R.id.tv_edit, R.id.tv_check_all, R.id.tv_delete})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.tv_edit://修正
updateEditState();
break;
case R.id.tv_check_all://全选
setAllItemChecked();
break;
case R.id.tv_delete://删去
deleteCheckItem();
break;
}
}
//改动修正状况
private void updateEditState() {
mEditMode = mEditMode == STATE_DEFAULT ? STATE_EDIT : STATE_DEFAULT;
if (mEditMode == STATE_EDIT) {
tvEdit.setText("撤销");
layBottom.setVisibility(View.VISIBLE);
editorStatus = true;
} else {
tvEdit.setText("修正");
layBottom.setVisibility(View.GONE);
editorStatus = false;
setAllItemUnchecked();//撤销全选
}
mAdapter.setEditMode(mEditMode);
mAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {
@Override
public void onItemChildClick(BaseQuickAdapter adapter, View view, int position) {
if (editorStatus) {//修正状况
DataResponse.DataBean dataBean = mList.get(position);
boolean isSelect = dataBean.isSelect();
if (!isSelect) {
index++;
dataBean.setSelect(true);
} else {
dataBean.setSelect(false);
index--;
}
if (index == 0) {
tvDelete.setText("删去");
} else {
tvDelete.setText("删去(" + index + ")");
}
mAdapter.notifyDataSetChanged();
}
}
});
}
//悉数选中
private void setAllItemChecked() {
if (mAdapter == null) return;
for (int i = 0; i < mList.size(); i++) {
mList.get(i).setSelect(true);
}
mAdapter.notifyDataSetChanged();
index = mList.size();
tvDelete.setText("删去(" + index + ")");
}
//撤销悉数选中
private void setAllItemUnchecked() {
if (mAdapter == null) return;
for (int i = 0; i < mList.size(); i++) {
mList.get(i).setSelect(false);
}
mAdapter.notifyDataSetChanged();
tvDelete.setText("删去");
index = 0;
}
//删去选中的item
private void deleteCheckItem() {
if (mAdapter == null) return;
for (int i = mList.size() - 1; i >= 0; i--) {
if (mList.get(i).isSelect() == true) {
mList.remove(i);
}
}
//删去选中的item之后判别是否还有数据，没有则退出修正形式
if (mList.size() != 0) {
index = 0;//删去之后置为0
tvDelete.setText("删去");
}else {
tvEdit.setText("修正");
layBottom.setVisibility(View.GONE);
editorStatus = false;
//没有数据天然也不存在修正了
tvEdit.setVisibility(View.GONE);
rvNormalShow.setVisibility(View.VISIBLE);
//启用下拉
refresh.setEnableRefresh(true);
//下拉改写
refresh.setOnRefreshListener(refreshLayout -> {
//从头装填数据
initList();
index = 0;
mEditMode = STATE_DEFAULT;//康复默许状况
editorStatus = false;//康复默许状况
tvDelete.setText("删去");
tvEdit.setVisibility(View.VISIBLE);//显现修正
});
}
mAdapter.notifyDataSetChanged();
runLayoutAnimation(rv);//动画显现
}
}
