RecyclerViewSelectableAdapterDemo【封装BaseSelectableAdapter用于多选、单选,以及切换选中状态等功能】
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前言
记录封装单选、多选、切换选中状态的BaseSelectableAdapter基类,配合Recyclerview使用。
注意:此Demo只是一个简单的使用,那么实际项目中需要灵活处理!
效果图
代码分析
BaseSelectableAdapter:基类;
BaseSelectable:接口;
OnItemCheckListener:单选图片的监听事件
使用步骤
一、项目组织结构图
注意事项:
1、 导入类文件后需要change包名以及重新import R文件路径
2、 Values目录下的文件(strings.xml、dimens.xml、colors.xml等),如果项目中存在,则复制里面的内容,不要整个覆盖
二、导入步骤
(1)在build.gradle中引用recyclerview【版本号和appcompat保持一致】
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.why.project.recyclerviewselectableadapterdemo"
minSdkVersion 16
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
//RecyclerView
compile "com.android.support:recyclerview-v7:27.1.1"
}
(2)在项目中实现Recyclerview基本数据展现
1、创建Bean类
package com.why.project.recyclerviewselectableadapterdemo.bean; /** * Created by HaiyuKing * Used 列表项的bean类 */ public class Photo { private String id; private String path; public Photo(String id, String path) { this.id = id; this.path = path; } public Photo() { } public String getPath() { return path; } public void setPath(String path) { this.path = path; } public String getId() { return id; } public void setId(String id) { this.id = id; } }
2、创建Adapter以及item的布局文件【此时的Adapter只是最开始的基本写法,后续继承BaseSelectableAdapter后还需要修改】
package com.why.project.recyclerviewselectableadapterdemo.adapter; import android.content.Context; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.RelativeLayout; import com.why.project.recyclerviewselectableadapterdemo.R; import com.why.project.recyclerviewselectableadapterdemo.bean.Photo; import com.why.project.recyclerviewselectableadapterdemo.util.ResDrawableImgUtil; import java.util.ArrayList; /** * Created by HaiyuKing * Used 列表适配器 */ public class ChannelAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{ /**上下文*/ private Context myContext; /**频道集合*/ private ArrayList<Photo> listitemList; /** * 构造函数 */ public ChannelAdapter(Context context, ArrayList<Photo> itemlist) { myContext = context; listitemList = itemlist; } /** * 获取总的条目数 */ @Override public int getItemCount() { return listitemList.size(); } /** * 创建ViewHolder */ @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = LayoutInflater.from(myContext).inflate(R.layout.channel_list_item, parent, false); ItemViewHolder itemViewHolder = new ItemViewHolder(view); return itemViewHolder; } /** * 声明grid列表项ViewHolder*/ static class ItemViewHolder extends RecyclerView.ViewHolder { public ItemViewHolder(View view) { super(view); listItemLayout = view.findViewById(R.id.griditemLayout); gridImg = view.findViewById(R.id.pic_gridimage); choseImg = view.findViewById(R.id.pic_chose); } RelativeLayout listItemLayout; ImageView gridImg; ImageView choseImg; } /** * 将数据绑定至ViewHolder */ @Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int index) { //判断属于列表项还是上拉加载区域 if(viewHolder instanceof ItemViewHolder){ Photo photo = listitemList.get(index); final ItemViewHolder itemViewHold = ((ItemViewHolder)viewHolder); String imgPath = photo.getPath(); Log.e("ChannelAdapter","imgPath="+imgPath); itemViewHold.gridImg.setImageResource(ResDrawableImgUtil.getResourceIdByIdentifier(myContext,imgPath)); //如果设置了回调,则设置点击事件 if (mOnItemClickLitener != null) { itemViewHold.listItemLayout.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { int position = itemViewHold.getLayoutPosition();//在增加数据或者减少数据时候,position和index就不一样了 mOnItemClickLitener.onItemClick(itemViewHold.listItemLayout, position); } }); //长按事件 itemViewHold.listItemLayout.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View view) { int position = itemViewHold.getLayoutPosition();//在增加数据或者减少数据时候,position和index就不一样了 mOnItemClickLitener.onItemLongClick(itemViewHold.listItemLayout, position); return false; } }); } } } /** * 添加Item--用于动画的展现*/ public void addItem(int position,Photo listitemBean) { listitemList.add(position,listitemBean); notifyItemInserted(position); } /** * 删除Item--用于动画的展现*/ public void removeItem(int position) { listitemList.remove(position); notifyItemRemoved(position); } /*=====================添加OnItemClickListener回调================================*/ public interface OnItemClickLitener { void onItemClick(View view, int position); void onItemLongClick(View view, int position); } private OnItemClickLitener mOnItemClickLitener; public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) { this.mOnItemClickLitener = mOnItemClickLitener; } }