组合控件——增强型列表——循环视图RecyclerView——动态更新循环视图

àì夳堔傛蜴生んèń 2023-09-28 23:06 51阅读 0赞

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xml布局：

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主代码：

package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Toast;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.recyclerview.widget.DefaultItemAnimator;
    import androidx.recyclerview.widget.RecyclerView;
    import androidx.recyclerview.widget.LinearLayoutManager;
    import com.example.myapplication.adapter.LinearDynamicAdapter;
    import com.example.myapplication.bean.NewsInfo;
    import com.example.myapplication.widget.RecyclerExtras.OnItemClickListener;
    import com.example.myapplication.widget.RecyclerExtras.OnItemDeleteClickListener;
    import com.example.myapplication.widget.RecyclerExtras.OnItemLongClickListener;
    import com.example.myapplication.widget.SpacesDecoration;
    import java.util.List;
    import java.util.Random;
    
    @SuppressLint("DefaultLocale")
    public class MainActivity extends AppCompatActivity  implements View.OnClickListener
            , OnItemClickListener, OnItemLongClickListener, OnItemDeleteClickListener
    {
        private RecyclerView rv_dynamic; // 声明一个循环视图对象
        private LinearDynamicAdapter mAdapter; // 声明一个线性适配器对象
        private List<NewsInfo> mPublicList = NewsInfo.getDefaultList(); // 当前的公众号信息列表
        private List<NewsInfo> mOriginList = NewsInfo.getDefaultList(); // 原始的公众号信息列表
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            findViewById(R.id.btn_recycler_add).setOnClickListener(this);
            initRecyclerDynamic(); // 初始化动态线性布局的循环视图
        }
    
        // 初始化动态线性布局的循环视图
        private void initRecyclerDynamic() {
            // 从布局文件中获取名叫rv_dynamic的循环视图
            rv_dynamic = findViewById(R.id.rv_dynamic);
            // 创建一个垂直方向的线性布局管理器
            LinearLayoutManager manager = new LinearLayoutManager(
                    this, RecyclerView.VERTICAL, false);
            rv_dynamic.setLayoutManager(manager); // 设置循环视图的布局管理器
            // 构建一个公众号列表的线性适配器
            mAdapter = new LinearDynamicAdapter(this, mPublicList);
            mAdapter.setOnItemClickListener(this); // 设置线性列表的点击监听器
            mAdapter.setOnItemLongClickListener(this); // 设置线性列表的长按监听器
            mAdapter.setOnItemDeleteClickListener(this); // 设置线性列表的删除按钮监听器
            rv_dynamic.setAdapter(mAdapter); // 设置循环视图的线性适配器
            rv_dynamic.setItemAnimator(new DefaultItemAnimator());  // 设置循环视图的动画效果
            rv_dynamic.addItemDecoration(new SpacesDecoration(1));  // 设置循环视图的空白装饰
        }
    
        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.btn_recycler_add) {
                int position = new Random().nextInt(mOriginList.size()-1); // 获取一个随机位置
                NewsInfo old_item = mOriginList.get(position);
                NewsInfo new_item = new NewsInfo(old_item.pic_id, old_item.title, old_item.desc);
                mPublicList.add(0, new_item); // 在顶部添加一条公众号消息
                mAdapter.notifyItemInserted(0); // 通知适配器列表在第一项插入数据
                rv_dynamic.scrollToPosition(0); // 让循环视图滚动到第一项所在的位置
            }
        }
    
        // 一旦点击循环适配器的列表项，就触发点击监听器的onItemClick方法
        public void onItemClick(View view, int position) {
            String desc = String.format("您点击了第%d项，标题是%s", position + 1,
                    mPublicList.get(position).title);
            Toast.makeText(this, desc, Toast.LENGTH_SHORT).show();
        }
    
        // 一旦长按循环适配器的列表项，就触发长按监听器的onItemLongClick方法
        public void onItemLongClick(View view, int position) {
            NewsInfo item = mPublicList.get(position);
            item.isPressed = !item.isPressed;
            mPublicList.set(position, item);
            mAdapter.notifyItemChanged(position); // 通知适配器列表在第几项发生变更
        }
    
        // 一旦点击循环适配器列表项的删除按钮，就触发删除监听器的onItemDeleteClick方法
        public void onItemDeleteClick(View view, int position) {
            mPublicList.remove(position);
            mAdapter.notifyItemRemoved(position); // 通知适配器列表在第几项删除数据
        }
    
    }

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NewsInfo

package com.example.myapplication.bean;
    
    import com.example.myapplication.R;
    import java.util.ArrayList;
    import java.util.List;
    
    public class NewsInfo
    {
    
        public int pic_id; // 图片的资源编号
        public String title; // 标题
        public String desc; // 描述
        public boolean isPressed; // 是否按下
        public int id; // 商品信息编号
        private static int seq = 0; // 序号
    
        public NewsInfo(int pic_id, String title, String desc)
        {
    
            this.pic_id = pic_id;
            this.title = title;
            this.desc = desc;
            this.isPressed = false;
            this.id = this.seq;
            this.seq++;
        }
    
        private static int[] newsImageArray = {R.drawable.public_01, R.drawable.public_02
                , R.drawable.public_03, R.drawable.public_04, R.drawable.public_05};
    
        private static String[] newsTitleArray = {
                "首都日报", "海峡时报", "东方周末", "参照消息", "挨踢杂志"};
    
        private static String[] newsDescArray = {
                "北京冬奥精彩纷呈，中外健儿各显神通",
                "庆祝伟大统一，闽台两地合办中秋晚会",
                "日本新娘仰慕中土，纷纷跨海嫁往上海",
                "雅万高铁建成通车，中国标准再下一城",
                "Mate40大战iPhone12，两大豪机争上游"};
    
        public static List<NewsInfo> getDefaultList()
        {
    
            List<NewsInfo> newsList = new ArrayList<NewsInfo>();
            for (int i = 0; i < newsImageArray.length; i++) {
                newsList.add(new NewsInfo(newsImageArray[i], newsTitleArray[i], newsDescArray[i]));
            }
            return newsList;
        }
    
        private static int[] gridImageArray = {R.drawable.pic_01, R.drawable.pic_02, R.drawable.pic_03
                , R.drawable.pic_04, R.drawable.pic_05, R.drawable.pic_06, R.drawable.pic_07
                , R.drawable.pic_08, R.drawable.pic_09, R.drawable.pic_10};
    
        private static String[] gridTitleArray = {"商场", "超市", "百货", "便利店",
                "地摊", "食杂店", "饭店", "餐厅", "会所", "菜市场"};
    
        public static List<NewsInfo> getDefaultGrid() {
            List<NewsInfo> gridList = new ArrayList<NewsInfo>();
            for (int i = 0; i < gridImageArray.length; i++) {
                gridList.add(new NewsInfo(gridImageArray[i], gridTitleArray[i], null));
            }
            return gridList;
        }
    
        private static int[] stagImageArray = {R.drawable.skirt01, R.drawable.skirt02, R.drawable.skirt03
                , R.drawable.skirt04, R.drawable.skirt05, R.drawable.skirt06, R.drawable.skirt07
                , R.drawable.skirt08, R.drawable.skirt09, R.drawable.skirt10, R.drawable.skirt11
                , R.drawable.skirt12, R.drawable.skirt13, R.drawable.skirt14, R.drawable.skirt15
                , R.drawable.skirt16, R.drawable.skirt17, R.drawable.skirt18, R.drawable.skirt19
                , R.drawable.skirt20, R.drawable.skirt21, R.drawable.skirt22, R.drawable.skirt23};
    
        private static String[] stagTitleArray = {"促销价", "惊爆价", "跳楼价", "白菜价", "清仓价", "割肉价",
                "实惠价", "一口价", "满意价", "打折价", "腰斩价", "无人问津", "算了吧", "大声点",
                "嘘嘘", "嗯嗯", "呼呼", "呵呵", "哈哈", "嘿嘿", "嘻嘻", "嗷嗷", "喔喔"};
    
        public static List<NewsInfo> getDefaultStag() {
            List<NewsInfo> stagList = new ArrayList<NewsInfo>();
            for (int i = 0; i < stagImageArray.length; i++) {
                stagList.add(new NewsInfo(stagImageArray[i], stagTitleArray[i], null));
            }
            return stagList;
        }
    
        private static int[] combineImageArray = {R.drawable.cainixihuan, R.drawable.dapaijiadao
                , R.drawable.trip_01, R.drawable.trip_02, R.drawable.trip_03, R.drawable.trip_04};
        private static String[] combineTitleArray = {
                "猜你喜欢", "大牌驾到", "买哪个", "别想了", "先下单", "包你满意"};
    
        public static List<NewsInfo> getDefaultCombine() {
            List<NewsInfo> combineList = new ArrayList<NewsInfo>();
            for (int i = 0; i < combineImageArray.length; i++) {
                combineList.add(new NewsInfo(combineImageArray[i], combineTitleArray[i], null));
            }
            return combineList;
        }
    
        private static int[] appiImageArray = {R.drawable.dian01, R.drawable.dian02, R.drawable.dian03
                , R.drawable.dian04, R.drawable.dian05, R.drawable.dian06, R.drawable.dian07
                , R.drawable.dian08, R.drawable.dian09, R.drawable.dian10, R.drawable.dian11
                , R.drawable.dian12, R.drawable.dian13, R.drawable.dian14, R.drawable.dian15};
        private static String[] appiTitleArray = {"双十一", "大聚惠", "爆款价",
                "就一次", "手慢无", "快点击", "付定金", "享特权", "包安装", "再返券",
                "白送你", "想得美", "干活去", "好好学", "才有钱"};
    
        public static List<NewsInfo> getDefaultAppi() {
            List<NewsInfo> appiList = new ArrayList<NewsInfo>();
            for (int i = 0; i < appiImageArray.length; i++) {
                appiList.add(new NewsInfo(appiImageArray[i], appiTitleArray[i], null));
            }
            return appiList;
        }
    
    }

RecyclerExtras

package com.example.myapplication.widget;
    
    import android.view.View;
    
    public class RecyclerExtras
    {
    
        // 定义一个循环视图列表项的点击监听器接口
        public interface OnItemClickListener
        {
            void onItemClick(View view, int position);
    
        }
    
        // 定义一个循环视图列表项的长按监听器接口
        public interface OnItemLongClickListener
        {
    
            void onItemLongClick(View view, int position);
        }
    
        // 定义一个循环视图列表项的删除监听器接口
        public interface OnItemDeleteClickListener 
        {
            void onItemDeleteClick(View view, int position);
        }
    
    }

SpacesDecoration

package com.example.myapplication.widget;
    
    import android.graphics.Rect;
    import android.view.View;
    import androidx.recyclerview.widget.RecyclerView;
    
    public class SpacesDecoration extends RecyclerView.ItemDecoration
    {
    
        private int space; // 空白间隔
    
        public SpacesDecoration(int space)
        {
    
            this.space = space;
        }
    
        @Override
        public void getItemOffsets(Rect outRect, View v, RecyclerView parent, RecyclerView.State state)
        {
    
            outRect.left = space; // 左边空白间隔
            outRect.right = space; // 右边空白间隔
            outRect.bottom = space; // 上方空白间隔
            outRect.top = space; // 下方空白间隔
    
        }
    
    }

LinearDynamicAdapter

package com.example.myapplication.adapter;
    
    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import androidx.recyclerview.widget.RecyclerView;
    import androidx.recyclerview.widget.RecyclerView.ViewHolder;
    import com.example.myapplication.R;
    import com.example.myapplication.bean.NewsInfo;
    import com.example.myapplication.widget.RecyclerExtras.OnItemClickListener;
    import com.example.myapplication.widget.RecyclerExtras.OnItemDeleteClickListener;
    import com.example.myapplication.widget.RecyclerExtras.OnItemLongClickListener;
    import java.util.List;
    
    public class LinearDynamicAdapter extends RecyclerView.Adapter<ViewHolder> implements View.OnClickListener, View.OnLongClickListener
    {
    
        private final static String TAG = "LinearDynamicAdapter";
        private Context mContext; // 声明一个上下文对象
        private List<NewsInfo> mPublicList;
    
        public LinearDynamicAdapter(Context context, List<NewsInfo> publicList)
        {
    
            mContext = context;
            mPublicList = publicList;
        }
    
        // 获取列表项的个数
        public int getItemCount()
        {
    
            return mPublicList.size();
        }
    
        // 创建列表项的视图持有者
        public ViewHolder onCreateViewHolder(ViewGroup vg, int viewType)
        {
    
            // 根据布局文件item_linear.xml生成视图对象
            View v = LayoutInflater.from(mContext).inflate(R.layout.item_linear, vg, false);
            return new ItemHolder(v);
        }
    
        // 根据列表项编号获取当前的位置序号
        private int getPosition(int item_id)
        {
    
            int pos = 0;
            for (int i = 0; i < mPublicList.size(); i++)
            {
    
                if (mPublicList.get(i).id == item_id)
                {
    
                    pos = i;
                    break;
                }
            }
            return pos;
        }
    
        private int CLICK = 0; // 正常点击
        private int DELETE = 1; // 点击了删除按钮
    
        @Override
        public void onClick(View v)
        {
    
            int position = getPosition((int) v.getId() / 10);
            int type = (int) v.getId() % 10;
            if (type == CLICK) { // 正常点击，则触发点击监听器的onItemClick方法
                if (mOnItemClickListener != null)
                {
    
                    mOnItemClickListener.onItemClick(v, position);
                }
            }
            else if (type == DELETE)  // 点击了删除按钮，则触发删除监听器的onItemDeleteClick方法
            {
                if (mOnItemDeleteClickListener != null)
                {
                    mOnItemDeleteClickListener.onItemDeleteClick(v, position);
                }
            }
        }
    
        @Override
        public boolean onLongClick(View v) { // 长按了列表项，则调用长按监听器的onItemLongClick方法
            int position = getPosition((int) v.getId() / 10);
            if (mOnItemLongClickListener != null) {
                mOnItemLongClickListener.onItemLongClick(v, position);
            }
            return true;
        }
    
        // 绑定列表项的视图持有者
        public void onBindViewHolder(ViewHolder vh, final int position) {
            NewsInfo item = mPublicList.get(position);
            ItemHolder holder = (ItemHolder) vh;
            holder.iv_pic.setImageResource(item.pic_id);
            holder.tv_title.setText(item.title);
            holder.tv_desc.setText(item.desc);
            holder.tv_delete.setVisibility((item.isPressed) ? View.VISIBLE : View.GONE);
            holder.tv_delete.setId(item.id * 10 + DELETE);
            holder.tv_delete.setOnClickListener(this);
            holder.ll_item.setId(item.id * 10 + CLICK);
            // 列表项的点击事件需要自己实现
            holder.ll_item.setOnClickListener(this);
            // 列表项的长按事件需要自己实现
            holder.ll_item.setOnLongClickListener(this);
        }
    
        // 获取列表项的类型
        public int getItemViewType(int position) {
            return 0;
        }
    
        // 获取列表项的编号
        public long getItemId(int position) {
            return position;
        }
    
        // 定义列表项的视图持有者
        public class ItemHolder extends ViewHolder {
            public LinearLayout ll_item; // 声明列表项的线性布局
            public ImageView iv_pic; // 声明列表项图标的图像视图
            public TextView tv_title; // 声明列表项标题的文本视图
            public TextView tv_desc; // 声明列表项描述的文本视图
            public TextView tv_delete; // 声明列表项删除按钮的文本视图
    
            public ItemHolder(View v) {
                super(v);
                ll_item = v.findViewById(R.id.ll_item);
                iv_pic = v.findViewById(R.id.iv_pic);
                tv_title = v.findViewById(R.id.tv_title);
                tv_desc = v.findViewById(R.id.tv_desc);
                tv_delete = v.findViewById(R.id.tv_delete);
            }
    
        }
    
        // 声明列表项的点击监听器对象
        private OnItemClickListener mOnItemClickListener;
    
        public void setOnItemClickListener(OnItemClickListener listener) {
            this.mOnItemClickListener = listener;
        }
    
        // 声明列表项的长按监听器对象
        private OnItemLongClickListener mOnItemLongClickListener;
    
        public void setOnItemLongClickListener(OnItemLongClickListener listener) {
            this.mOnItemLongClickListener = listener;
        }
    
        // 声明列表项的删除监听器对象
        private OnItemDeleteClickListener mOnItemDeleteClickListener;
    
        public void setOnItemDeleteClickListener(OnItemDeleteClickListener listener) {
            this.mOnItemDeleteClickListener = listener;
        }
    
    }

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