• 组合控件——增强型列表——循环视图RecyclerView——布局管理器LayoutManager

    RecyclerView的布局样式依赖于布局管理器LayoutManager，它提供了下面3类布局管理器。

    (1)线性布局管理器LinearLayoutManager

    该管理器可看作线性布局LinearLayout，在垂直方向布局时，展示效果类似于垂直的列表视图ListView；在水平方向布局时，展示效果类似于水平的列表视图。

    下面是LinearLayoutManager的常用方法。

    构造函数：可指定列表的方向和是否为相反方向开始布局。

    setOrientation :设置列表的方向。

    setReverseLayout :设置是否为相反方向开始布局，默认false。

    (2)网格布局管理器GridLayoutManager

    该管理器可看作网格布局GridLayout，其展示效果类似于网格视图GridView。

    GridLayout、GridView、GridLayoutManager都呈现多行多列的网格界面。

    下面是GridLayoutManager的常用方法。

    构造函数：可指定网格的列数。setSpanCount：设置网格的列数。setSpanSizeLookup：设置列表项的占位规则。

    (3)瀑布流网格布局管理器StaggeredGridLayoutManager

    该管理器允许使用灵活高度的格子展示每个视图，例如根据不同的商品形状展示不同高度的图片。

    下面是StaggeredGridLayoutManager的常用方法。

    构造函数：可指定网格的列数和方向。

    setSpanCount：设置网格的列数。setOrientation :设置列表的方向。setReverseLayout :设置是否为相反方向开始布局，默认false。

    =========================================================================================

    xml布局：

    1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    2.     android:layout_width="match_parent"
    3.     android:layout_height="match_parent"
    4.     android:padding="5dp"
    5.     android:orientation="vertical">
    6.  
    7.     <androidx.recyclerview.widget.RecyclerView
    8.         android:id="@+id/rv_grid"
    9.         android:layout_width="match_parent"
    10.         android:layout_height="wrap_content" />
    11.  
    12. </LinearLayout>

    主代码：

    1. package com.example.myapplication;
    2.  
    3. import android.annotation.SuppressLint;
    4. import android.os.Bundle;
    5. import androidx.appcompat.app.AppCompatActivity;
    6. import androidx.recyclerview.widget.DefaultItemAnimator;
    7. import androidx.recyclerview.widget.GridLayoutManager;
    8. import androidx.recyclerview.widget.RecyclerView;
    9. import com.example.myapplication.adapter.RecyclerGridAdapter;
    10. import com.example.myapplication.bean.NewsInfo;
    11. import com.example.myapplication.widget.SpacesDecoration;
    12.  
    13. @SuppressLint("SetTextI18n")
    14. public class MainActivity extends AppCompatActivity
    15. {
    16.     @Override
    17.     protected void onCreate(Bundle savedInstanceState)
    18.     {
    19.         super.onCreate(savedInstanceState);
    20.         setContentView(R.layout.activity_main);
    21.  
    22.         initRecyclerGrid(); // 初始化网格布局的循环视图
    23.     }
    24.  
    25.     // 初始化网格布局的循环视图
    26.     private void initRecyclerGrid()
    27.     {
    28.  
    29.         // 从布局文件中获取名叫rv_grid的循环视图
    30.         RecyclerView rv_grid = findViewById(R.id.rv_grid);
    31.  
    32.         // 创建一个网格布局管理器(每行5列)
    33.         GridLayoutManager manager = new GridLayoutManager(this, 5);
    34.  
    35.         rv_grid.setLayoutManager(manager); // 设置循环视图的布局管理器
    36.  
    37.         // 构建一个市场列表的网格适配器
    38.         RecyclerGridAdapter adapter = new RecyclerGridAdapter(this, NewsInfo.getDefaultGrid());
    39.  
    40.         adapter.setOnItemClickListener(adapter); // 设置网格列表的点击监听器
    41.  
    42.         adapter.setOnItemLongClickListener(adapter); // 设置网格列表的长按监听器
    43.  
    44.         rv_grid.setAdapter(adapter); // 设置循环视图的网格适配器
    45.  
    46.         rv_grid.setItemAnimator(new DefaultItemAnimator());  // 设置循环视图的动画效果
    47.  
    48.         rv_grid.addItemDecoration(new SpacesDecoration(1));  // 设置循环视图的空白装饰
    49.  
    50.     }
    51.  
    52. }

     

    NewsInfo

    1. package com.example.myapplication.bean;
    2.  
    3. import com.example.myapplication.R;
    4. import java.util.ArrayList;
    5. import java.util.List;
    6.  
    7. public class NewsInfo
    8. {
    9.  
    10.     public int pic_id; // 图片的资源编号
    11.     public String title; // 标题
    12.     public String desc; // 描述
    13.     public boolean isPressed; // 是否按下
    14.     public int id; // 商品信息编号
    15.     private static int seq = 0; // 序号
    16.  
    17.     public NewsInfo(int pic_id, String title, String desc)
    18.     {
    19.  
    20.         this.pic_id = pic_id;
    21.         this.title = title;
    22.         this.desc = desc;
    23.         this.isPressed = false;
    24.         this.id = this.seq;
    25.         this.seq++;
    26.     }
    27.  
    28.     private static int[] newsImageArray = {R.drawable.public_01, R.drawable.public_02
    29.             , R.drawable.public_03, R.drawable.public_04, R.drawable.public_05};
    30.  
    31.     private static String[] newsTitleArray = {
    32.             "首都日报", "海峡时报", "东方周末", "参照消息", "挨踢杂志"};
    33.  
    34.     private static String[] newsDescArray = {
    35.             "北京冬奥精彩纷呈，中外健儿各显神通",
    36.             "庆祝伟大统一，闽台两地合办中秋晚会",
    37.             "日本新娘仰慕中土，纷纷跨海嫁往上海",
    38.             "雅万高铁建成通车，中国标准再下一城",
    39.             "Mate40大战iPhone12，两大豪机争上游"};
    40.  
    41.     public static List<NewsInfo> getDefaultList()
    42.     {
    43.  
    44.         List<NewsInfo> newsList = new ArrayList<NewsInfo>();
    45.         for (int i = 0; i < newsImageArray.length; i++) {
    46.             newsList.add(new NewsInfo(newsImageArray[i], newsTitleArray[i], newsDescArray[i]));
    47.         }
    48.         return newsList;
    49.     }
    50.  
    51.     private static int[] gridImageArray = {R.drawable.pic_01, R.drawable.pic_02, R.drawable.pic_03
    52.             , R.drawable.pic_04, R.drawable.pic_05, R.drawable.pic_06, R.drawable.pic_07
    53.             , R.drawable.pic_08, R.drawable.pic_09, R.drawable.pic_10};
    54.  
    55.     private static String[] gridTitleArray = {"商场", "超市", "百货", "便利店",
    56.             "地摊", "食杂店", "饭店", "餐厅", "会所", "菜市场"};
    57.  
    58.     public static List<NewsInfo> getDefaultGrid() {
    59.         List<NewsInfo> gridList = new ArrayList<NewsInfo>();
    60.         for (int i = 0; i < gridImageArray.length; i++) {
    61.             gridList.add(new NewsInfo(gridImageArray[i], gridTitleArray[i], null));
    62.         }
    63.         return gridList;
    64.     }
    65.  
    66.     private static int[] stagImageArray = {R.drawable.skirt01, R.drawable.skirt02, R.drawable.skirt03
    67.             , R.drawable.skirt04, R.drawable.skirt05, R.drawable.skirt06, R.drawable.skirt07
    68.             , R.drawable.skirt08, R.drawable.skirt09, R.drawable.skirt10, R.drawable.skirt11
    69.             , R.drawable.skirt12, R.drawable.skirt13, R.drawable.skirt14, R.drawable.skirt15
    70.             , R.drawable.skirt16, R.drawable.skirt17, R.drawable.skirt18, R.drawable.skirt19
    71.             , R.drawable.skirt20, R.drawable.skirt21, R.drawable.skirt22, R.drawable.skirt23};
    72.  
    73.     private static String[] stagTitleArray = {"促销价", "惊爆价", "跳楼价", "白菜价", "清仓价", "割肉价",
    74.             "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",
    75.             "嘘嘘", "嗯嗯", "呼呼", "呵呵", "哈哈", "嘿嘿", "嘻嘻", "嗷嗷", "喔喔"};
    76.  
    77.     public static List<NewsInfo> getDefaultStag() {
    78.         List<NewsInfo> stagList = new ArrayList<NewsInfo>();
    79.         for (int i = 0; i < stagImageArray.length; i++) {
    80.             stagList.add(new NewsInfo(stagImageArray[i], stagTitleArray[i], null));
    81.         }
    82.         return stagList;
    83.     }
    84.  
    85.     private static int[] combineImageArray = {R.drawable.cainixihuan, R.drawable.dapaijiadao
    86.             , R.drawable.trip_01, R.drawable.trip_02, R.drawable.trip_03, R.drawable.trip_04};
    87.     private static String[] combineTitleArray = {
    88.             "猜你喜欢", "大牌驾到", "买哪个", "别想了", "先下单", "包你满意"};
    89.  
    90.     public static List<NewsInfo> getDefaultCombine() {
    91.         List<NewsInfo> combineList = new ArrayList<NewsInfo>();
    92.         for (int i = 0; i < combineImageArray.length; i++) {
    93.             combineList.add(new NewsInfo(combineImageArray[i], combineTitleArray[i], null));
    94.         }
    95.         return combineList;
    96.     }
    97.  
    98.     private static int[] appiImageArray = {R.drawable.dian01, R.drawable.dian02, R.drawable.dian03
    99.             , R.drawable.dian04, R.drawable.dian05, R.drawable.dian06, R.drawable.dian07
    100.             , R.drawable.dian08, R.drawable.dian09, R.drawable.dian10, R.drawable.dian11
    101.             , R.drawable.dian12, R.drawable.dian13, R.drawable.dian14, R.drawable.dian15};
    102.     private static String[] appiTitleArray = {"双十一", "大聚惠", "爆款价",
    103.             "就一次", "手慢无", "快点击", "付定金", "享特权", "包安装", "再返券",
    104.             "白送你", "想得美", "干活去", "好好学", "才有钱"};
    105.  
    106.     public static List<NewsInfo> getDefaultAppi() {
    107.         List<NewsInfo> appiList = new ArrayList<NewsInfo>();
    108.         for (int i = 0; i < appiImageArray.length; i++) {
    109.             appiList.add(new NewsInfo(appiImageArray[i], appiTitleArray[i], null));
    110.         }
    111.         return appiList;
    112.     }
    113.  
    114. }

     

    RecyclerExtras

    1. package com.example.myapplication.widget;
    2.  
    3. import android.view.View;
    4.  
    5. public class RecyclerExtras
    6. {
    7.  
    8.     // 定义一个循环视图列表项的点击监听器接口
    9.     public interface OnItemClickListener
    10.     {
    11.         void onItemClick(View view, int position);
    12.  
    13.     }
    14.  
    15.     // 定义一个循环视图列表项的长按监听器接口
    16.     public interface OnItemLongClickListener
    17.     {
    18.  
    19.         void onItemLongClick(View view, int position);
    20.     }
    21.  
    22.     // 定义一个循环视图列表项的删除监听器接口
    23.     public interface OnItemDeleteClickListener 
    24.     {
    25.         void onItemDeleteClick(View view, int position);
    26.     }
    27.  
    28. }
    


    RecyclerGridAdapter

    1. package com.example.myapplication.adapter;
    2.  
    3. import android.annotation.SuppressLint;
    4. import android.content.Context;
    5. import android.view.LayoutInflater;
    6. import android.view.View;
    7. import android.view.View.OnClickListener;
    8. import android.view.View.OnLongClickListener;
    9. import android.view.ViewGroup;
    10. import android.widget.ImageView;
    11. import android.widget.LinearLayout;
    12. import android.widget.TextView;
    13. import android.widget.Toast;
    14. import androidx.recyclerview.widget.RecyclerView;
    15. import androidx.recyclerview.widget.RecyclerView.ViewHolder;
    16. import com.example.myapplication.R;
    17. import com.example.myapplication.bean.NewsInfo;
    18. import com.example.myapplication.widget.RecyclerExtras.OnItemClickListener;
    19. import com.example.myapplication.widget.RecyclerExtras.OnItemLongClickListener;
    20. import java.util.List;
    21.  
    22. @SuppressLint("DefaultLocale")
    23. public class RecyclerGridAdapter extends RecyclerView.Adapter implements
    24.         OnItemClickListener, OnItemLongClickListener {
    25.     private final static String TAG = "RecyclerGridAdapter";
    26.     private Context mContext; // 声明一个上下文对象
    27.     private List mGoodsList;
    28.  
    29.     public RecyclerGridAdapter(Context context, List goodsList) {
    30.         mContext = context;
    31.         mGoodsList = goodsList;
    32.     }
    33.  
    34.     // 获取列表项的个数
    35.     public int getItemCount() {
    36.         return mGoodsList.size();
    37.     }
    38.  
    39.     // 创建列表项的视图持有者
    40.     public ViewHolder onCreateViewHolder(ViewGroup vg, int viewType) {
    41.         // 根据布局文件item_grid.xml生成视图对象
    42.         View v = LayoutInflater.from(mContext).inflate(R.layout.item_grid, vg, false);
    43.         return new ItemHolder(v);
    44.     }
    45.  
    46.     // 绑定列表项的视图持有者
    47.     public void onBindViewHolder(ViewHolder vh, @SuppressLint("RecyclerView") final int position) {
    48.         ItemHolder holder = (ItemHolder) vh;
    49.         holder.iv_pic.setImageResource(mGoodsList.get(position).pic_id);
    50.         holder.tv_title.setText(mGoodsList.get(position).title);
    51.         // 列表项的点击事件需要自己实现
    52.         holder.ll_item.setOnClickListener(new OnClickListener() {
    53.             @Override
    54.             public void onClick(View v) {
    55.                 if (mOnItemClickListener != null) {
    56.                     mOnItemClickListener.onItemClick(v, position);
    57.                 }
    58.             }
    59.         });
    60.         // 列表项的长按事件需要自己实现
    61.         holder.ll_item.setOnLongClickListener(new OnLongClickListener() {
    62.             @Override
    63.             public boolean onLongClick(View v) {
    64.                 if (mOnItemLongClickListener != null) {
    65.                     mOnItemLongClickListener.onItemLongClick(v, position);
    66.                 }
    67.                 return true;
    68.             }
    69.         });
    70.     }
    71.  
    72.     // 获取列表项的类型
    73.     public int getItemViewType(int position) {
    74.         return 0;
    75.     }
    76.  
    77.     // 获取列表项的编号
    78.     public long getItemId(int position) {
    79.         return position;
    80.     }
    81.  
    82.     // 定义列表项的视图持有者
    83.     public class ItemHolder extends RecyclerView.ViewHolder {
    84.         public LinearLayout ll_item; // 声明列表项的线性布局
    85.         public ImageView iv_pic; // 声明列表项图标的图像视图
    86.         public TextView tv_title; // 声明列表项标题的文本视图
    87.  
    88.         public ItemHolder(View v) {
    89.             super(v);
    90.             ll_item = v.findViewById(R.id.ll_item);
    91.             iv_pic = v.findViewById(R.id.iv_pic);
    92.             tv_title = v.findViewById(R.id.tv_title);
    93.         }
    94.     }
    95.  
    96.     // 声明列表项的点击监听器对象
    97.     private OnItemClickListener mOnItemClickListener;
    98.  
    99.     public void setOnItemClickListener(OnItemClickListener listener) {
    100.         this.mOnItemClickListener = listener;
    101.     }
    102.  
    103.     // 声明列表项的长按监听器对象
    104.     private OnItemLongClickListener mOnItemLongClickListener;
    105.  
    106.     public void setOnItemLongClickListener(OnItemLongClickListener listener) {
    107.         this.mOnItemLongClickListener = listener;
    108.     }
    109.  
    110.     // 处理列表项的点击事件
    111.     public void onItemClick(View view, int position) {
    112.         String desc = String.format("您点击了第%d项，栏目名称是%s", position + 1,
    113.                 mGoodsList.get(position).title);
    114.         Toast.makeText(mContext, desc, Toast.LENGTH_SHORT).show();
    115.     }
    116.  
    117.     // 处理列表项的长按事件
    118.     public void onItemLongClick(View view, int position) {
    119.         String desc = String.format("您长按了第%d项，栏目名称是%s", position + 1,
    120.                 mGoodsList.get(position).title);
    121.         Toast.makeText(mContext, desc, Toast.LENGTH_SHORT).show();
    122.     }
    123.  
    124. }

    item_grid.xml

    1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    2.     android:id="@+id/ll_item"
    3.     android:layout_width="match_parent"
    4.     android:layout_height="wrap_content"
    5.     android:background="@color/white"
    6.     android:orientation="vertical">
    7.  
    8.     <ImageView
    9.         android:id="@+id/iv_pic"
    10.         android:layout_width="match_parent"
    11.         android:layout_height="wrap_content"
    12.         android:scaleType="fitCenter" />
    13.  
    14.     <TextView
    15.         android:id="@+id/tv_title"
    16.         android:layout_width="match_parent"
    17.         android:layout_height="wrap_content"
    18.         android:gravity="center"
    19.         android:textColor="@color/black"
    20.         android:textSize="17sp" />
    21.  
    22. </LinearLayout>

    ================================================================================================

    瀑布流网格布局管理器

    xml布局：

    1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    2.     android:layout_width="match_parent"
    3.     android:layout_height="match_parent"
    4.     android:orientation="vertical">
    5.  
    6.     <androidx.recyclerview.widget.RecyclerView
    7.         android:id="@+id/rv_staggered"
    8.         android:layout_width="match_parent"
    9.         android:layout_height="wrap_content"
    10.         android:background="#ffffaa" />
    11.  
    12. </LinearLayout>

    主代码：

    1. package com.example.myapplication;
    2.  
    3. import android.annotation.SuppressLint;
    4. import android.os.Bundle;
    5. import androidx.appcompat.app.AppCompatActivity;
    6. import androidx.recyclerview.widget.DefaultItemAnimator;
    7. import androidx.recyclerview.widget.RecyclerView;
    8. import androidx.recyclerview.widget.StaggeredGridLayoutManager;
    9. import com.example.myapplication.adapter.RecyclerStagAdapter;
    10. import com.example.myapplication.bean.NewsInfo;
    11. import com.example.myapplication.widget.SpacesDecoration;
    12.  
    13. @SuppressLint("SetTextI18n")
    14. public class MainActivity extends AppCompatActivity
    15. {
    16.     @Override
    17.     protected void onCreate(Bundle savedInstanceState)
    18.     {
    19.         super.onCreate(savedInstanceState);
    20.         setContentView(R.layout.activity_main);
    21.  
    22.         initRecyclerStaggered(); // 初始化瀑布流布局的循环视图
    23.     }
    24.  
    25.     // 初始化瀑布流布局的循环视图
    26.     private void initRecyclerStaggered()
    27.     {
    28.  
    29.         // 从布局文件中获取名叫rv_staggered的循环视图
    30.         RecyclerView rv_staggered = findViewById(R.id.rv_staggered);
    31.  
    32.         // 创建一个垂直方向的瀑布流布局管理器(每行3列)
    33.         StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(3, RecyclerView.VERTICAL);
    34.  
    35.         rv_staggered.setLayoutManager(manager); // 设置循环视图的布局管理器
    36.  
    37.         // 构建一个服装列表的瀑布流适配器
    38.         RecyclerStagAdapter adapter = new RecyclerStagAdapter(this, NewsInfo.getDefaultStag());
    39.  
    40.         adapter.setOnItemClickListener(adapter); // 设置瀑布流列表的点击监听器
    41.  
    42.         adapter.setOnItemLongClickListener(adapter); // 设置瀑布流列表的长按监听器
    43.  
    44.         rv_staggered.setAdapter(adapter);  // 设置循环视图的瀑布流适配器
    45.  
    46.         rv_staggered.setItemAnimator(new DefaultItemAnimator());  // 设置循环视图的动画效果
    47.  
    48.         rv_staggered.addItemDecoration(new SpacesDecoration(3));  // 设置循环视图的空白装饰
    49.     }
    50.  
    51. }

     

    NewsInfo

    1. package com.example.myapplication.bean;
    2.  
    3. import com.example.myapplication.R;
    4. import java.util.ArrayList;
    5. import java.util.List;
    6.  
    7. public class NewsInfo
    8. {
    9.  
    10.     public int pic_id; // 图片的资源编号
    11.     public String title; // 标题
    12.     public String desc; // 描述
    13.     public boolean isPressed; // 是否按下
    14.     public int id; // 商品信息编号
    15.     private static int seq = 0; // 序号
    16.  
    17.     public NewsInfo(int pic_id, String title, String desc)
    18.     {
    19.  
    20.         this.pic_id = pic_id;
    21.         this.title = title;
    22.         this.desc = desc;
    23.         this.isPressed = false;
    24.         this.id = this.seq;
    25.         this.seq++;
    26.     }
    27.  
    28.     private static int[] newsImageArray = {R.drawable.public_01, R.drawable.public_02
    29.             , R.drawable.public_03, R.drawable.public_04, R.drawable.public_05};
    30.  
    31.     private static String[] newsTitleArray = {
    32.             "首都日报", "海峡时报", "东方周末", "参照消息", "挨踢杂志"};
    33.  
    34.     private static String[] newsDescArray = {
    35.             "北京冬奥精彩纷呈，中外健儿各显神通",
    36.             "庆祝伟大统一，闽台两地合办中秋晚会",
    37.             "日本新娘仰慕中土，纷纷跨海嫁往上海",
    38.             "雅万高铁建成通车，中国标准再下一城",
    39.             "Mate40大战iPhone12，两大豪机争上游"};
    40.  
    41.     public static List<NewsInfo> getDefaultList()
    42.     {
    43.  
    44.         List<NewsInfo> newsList = new ArrayList<NewsInfo>();
    45.         for (int i = 0; i < newsImageArray.length; i++) {
    46.             newsList.add(new NewsInfo(newsImageArray[i], newsTitleArray[i], newsDescArray[i]));
    47.         }
    48.         return newsList;
    49.     }
    50.  
    51.     private static int[] gridImageArray = {R.drawable.pic_01, R.drawable.pic_02, R.drawable.pic_03
    52.             , R.drawable.pic_04, R.drawable.pic_05, R.drawable.pic_06, R.drawable.pic_07
    53.             , R.drawable.pic_08, R.drawable.pic_09, R.drawable.pic_10};
    54.  
    55.     private static String[] gridTitleArray = {"商场", "超市", "百货", "便利店",
    56.             "地摊", "食杂店", "饭店", "餐厅", "会所", "菜市场"};
    57.  
    58.     public static List<NewsInfo> getDefaultGrid() {
    59.         List<NewsInfo> gridList = new ArrayList<NewsInfo>();
    60.         for (int i = 0; i < gridImageArray.length; i++) {
    61.             gridList.add(new NewsInfo(gridImageArray[i], gridTitleArray[i], null));
    62.         }
    63.         return gridList;
    64.     }
    65.  
    66.     private static int[] stagImageArray = {R.drawable.skirt01, R.drawable.skirt02, R.drawable.skirt03
    67.             , R.drawable.skirt04, R.drawable.skirt05, R.drawable.skirt06, R.drawable.skirt07
    68.             , R.drawable.skirt08, R.drawable.skirt09, R.drawable.skirt10, R.drawable.skirt11
    69.             , R.drawable.skirt12, R.drawable.skirt13, R.drawable.skirt14, R.drawable.skirt15
    70.             , R.drawable.skirt16, R.drawable.skirt17, R.drawable.skirt18, R.drawable.skirt19
    71.             , R.drawable.skirt20, R.drawable.skirt21, R.drawable.skirt22, R.drawable.skirt23};
    72.  
    73.     private static String[] stagTitleArray = {"促销价", "惊爆价", "跳楼价", "白菜价", "清仓价", "割肉价",
    74.             "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",
    75.             "嘘嘘", "嗯嗯", "呼呼", "呵呵", "哈哈", "嘿嘿", "嘻嘻", "嗷嗷", "喔喔"};
    76.  
    77.     public static List<NewsInfo> getDefaultStag() {
    78.         List<NewsInfo> stagList = new ArrayList<NewsInfo>();
    79.         for (int i = 0; i < stagImageArray.length; i++) {
    80.             stagList.add(new NewsInfo(stagImageArray[i], stagTitleArray[i], null));
    81.         }
    82.         return stagList;
    83.     }
    84.  
    85.     private static int[] combineImageArray = {R.drawable.cainixihuan, R.drawable.dapaijiadao
    86.             , R.drawable.trip_01, R.drawable.trip_02, R.drawable.trip_03, R.drawable.trip_04};
    87.     private static String[] combineTitleArray = {
    88.             "猜你喜欢", "大牌驾到", "买哪个", "别想了", "先下单", "包你满意"};
    89.  
    90.     public static List<NewsInfo> getDefaultCombine() {
    91.         List<NewsInfo> combineList = new ArrayList<NewsInfo>();
    92.         for (int i = 0; i < combineImageArray.length; i++) {
    93.             combineList.add(new NewsInfo(combineImageArray[i], combineTitleArray[i], null));
    94.         }
    95.         return combineList;
    96.     }
    97.  
    98.     private static int[] appiImageArray = {R.drawable.dian01, R.drawable.dian02, R.drawable.dian03
    99.             , R.drawable.dian04, R.drawable.dian05, R.drawable.dian06, R.drawable.dian07
    100.             , R.drawable.dian08, R.drawable.dian09, R.drawable.dian10, R.drawable.dian11
    101.             , R.drawable.dian12, R.drawable.dian13, R.drawable.dian14, R.drawable.dian15};
    102.     private static String[] appiTitleArray = {"双十一", "大聚惠", "爆款价",
    103.             "就一次", "手慢无", "快点击", "付定金", "享特权", "包安装", "再返券",
    104.             "白送你", "想得美", "干活去", "好好学", "才有钱"};
    105.  
    106.     public static List<NewsInfo> getDefaultAppi() {
    107.         List<NewsInfo> appiList = new ArrayList<NewsInfo>();
    108.         for (int i = 0; i < appiImageArray.length; i++) {
    109.             appiList.add(new NewsInfo(appiImageArray[i], appiTitleArray[i], null));
    110.         }
    111.         return appiList;
    112.     }
    113.  
    114. }

     

     

    item_staggered.xml

    1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    2.     android:id="@+id/ll_item"
    3.     android:layout_width="match_parent"
    4.     android:layout_height="wrap_content"
    5.     android:background="@color/white"
    6.     android:orientation="vertical">
    7.  
    8.     <ImageView
    9.         android:id="@+id/iv_pic"
    10.         android:layout_width="match_parent"
    11.         android:layout_height="wrap_content"
    12.         android:scaleType="centerCrop" />
    13.  
    14.     <TextView
    15.         android:id="@+id/tv_title"
    16.         android:layout_width="match_parent"
    17.         android:layout_height="wrap_content"
    18.         android:gravity="center"
    19.         android:textColor="@color/black"
    20.         android:textSize="17sp" />
    21.  
    22. </LinearLayout>
    


    RecyclerExtras

    1. package com.example.myapplication.widget;
    2.  
    3. import android.view.View;
    4.  
    5. public class RecyclerExtras
    6. {
    7.  
    8.     // 定义一个循环视图列表项的点击监听器接口
    9.     public interface OnItemClickListener
    10.     {
    11.         void onItemClick(View view, int position);
    12.  
    13.     }
    14.  
    15.     // 定义一个循环视图列表项的长按监听器接口
    16.     public interface OnItemLongClickListener
    17.     {
    18.  
    19.         void onItemLongClick(View view, int position);
    20.     }
    21.  
    22.     // 定义一个循环视图列表项的删除监听器接口
    23.     public interface OnItemDeleteClickListener 
    24.     {
    25.         void onItemDeleteClick(View view, int position);
    26.     }
    27.  
    28. }
    


    RecyclerStagAdapter

    1. package com.example.myapplication.adapter;
    2.  
    3. import android.annotation.SuppressLint;
    4. import android.content.Context;
    5. import android.view.LayoutInflater;
    6. import android.view.View;
    7. import android.view.View.OnClickListener;
    8. import android.view.View.OnLongClickListener;
    9. import android.view.ViewGroup;
    10. import android.widget.ImageView;
    11. import android.widget.LinearLayout;
    12. import android.widget.TextView;
    13. import android.widget.Toast;
    14. import androidx.recyclerview.widget.RecyclerView;
    15. import androidx.recyclerview.widget.RecyclerView.ViewHolder;
    16. import com.example.myapplication.R;
    17. import com.example.myapplication.bean.NewsInfo;
    18. import com.example.myapplication.widget.RecyclerExtras.OnItemClickListener;
    19. import com.example.myapplication.widget.RecyclerExtras.OnItemLongClickListener;
    20. import java.util.List;
    21.  
    22. @SuppressLint("DefaultLocale")
    23. public class RecyclerStagAdapter extends RecyclerView.Adapter<ViewHolder> implements OnItemClickListener, OnItemLongClickListener
    24. {
    25.  
    26.     private final static String TAG = "RecyclerStagAdapter";
    27.     private Context mContext; // 声明一个上下文对象
    28.     private List<NewsInfo> mGoodsList;
    29.  
    30.     public RecyclerStagAdapter(Context context, List<NewsInfo> goodsList)
    31.     {
    32.         mContext = context;
    33.         mGoodsList = goodsList;
    34.     }
    35.  
    36.     // 获取列表项的个数
    37.     public int getItemCount()
    38.     {
    39.  
    40.         return mGoodsList.size();
    41.     }
    42.  
    43.     // 创建列表项的视图持有者
    44.     public ViewHolder onCreateViewHolder(ViewGroup vg, int viewType)
    45.     {
    46.  
    47.         // 根据布局文件item_staggered.xml生成视图对象
    48.         View v = LayoutInflater.from(mContext).inflate(R.layout.item_staggered, vg, false);
    49.         return new ItemHolder(v);
    50.     }
    51.  
    52.     // 绑定列表项的视图持有者
    53.     public void onBindViewHolder(ViewHolder vh, final int position)
    54.     {
    55.  
    56.         ItemHolder holder = (ItemHolder) vh;
    57.         holder.iv_pic.setImageResource(mGoodsList.get(position).pic_id);
    58.         holder.tv_title.setText(mGoodsList.get(position).title);
    59. //        LayoutParams params = holder.ll_item.getLayoutParams();
    60. //        params.height = new Random().nextInt(100);
    61. //        if (params.height < 60) {
    62. //            params.height = 60;
    63. //        }
    64. //        // 很奇怪，setLayoutParams对瀑布流网格不起作用，只能用setHeight
    65. //        holder.tv_title.setHeight(params.height);
    66.  
    67.         // 列表项的点击事件需要自己实现
    68.         holder.ll_item.setOnClickListener(new OnClickListener() {
    69.             @Override
    70.             public void onClick(View v) {
    71.                 if (mOnItemClickListener != null) {
    72.                     mOnItemClickListener.onItemClick(v, position);
    73.                 }
    74.             }
    75.         });
    76.         // 列表项的长按事件需要自己实现
    77.         holder.ll_item.setOnLongClickListener(new OnLongClickListener()
    78.         {
    79.  
    80.             @Override
    81.             public boolean onLongClick(View v) {
    82.                 if (mOnItemLongClickListener != null) {
    83.                     mOnItemLongClickListener.onItemLongClick(v, position);
    84.                 }
    85.                 return true;
    86.             }
    87.         });
    88.     }
    89.  
    90.     // 获取列表项的类型
    91.     public int getItemViewType(int position) {
    92.         return 0;
    93.     }
    94.  
    95.     // 获取列表项的编号
    96.     public long getItemId(int position) {
    97.         return position;
    98.     }
    99.  
    100.     // 定义列表项的视图持有者
    101.     public class ItemHolder extends ViewHolder {
    102.         public LinearLayout ll_item; // 声明列表项的线性布局
    103.         public ImageView iv_pic; // 声明列表项图标的图像视图
    104.         public TextView tv_title; // 声明列表项标题的文本视图
    105.  
    106.         public ItemHolder(View v) {
    107.             super(v);
    108.             ll_item = v.findViewById(R.id.ll_item);
    109.             iv_pic = v.findViewById(R.id.iv_pic);
    110.             tv_title = v.findViewById(R.id.tv_title);
    111.         }
    112.     }
    113.  
    114.     // 声明列表项的点击监听器对象
    115.     private OnItemClickListener mOnItemClickListener;
    116.  
    117.     public void setOnItemClickListener(OnItemClickListener listener) {
    118.         this.mOnItemClickListener = listener;
    119.     }
    120.  
    121.     // 声明列表项的长按监听器对象
    122.     private OnItemLongClickListener mOnItemLongClickListener;
    123.  
    124.     public void setOnItemLongClickListener(OnItemLongClickListener listener) {
    125.         this.mOnItemLongClickListener = listener;
    126.     }
    127.  
    128.     // 处理列表项的点击事件
    129.     public void onItemClick(View view, int position) {
    130.         String desc = String.format("您点击了第%d项，商品名称是%s", position + 1,
    131.                 mGoodsList.get(position).title);
    132.         Toast.makeText(mContext, desc, Toast.LENGTH_SHORT).show();
    133.     }
    134.  
    135.     // 处理列表项的长按事件
    136.     public void onItemLongClick(View view, int position) {
    137.         String desc = String.format("您长按了第%d项，商品名称是%s", position + 1,
    138.                 mGoodsList.get(position).title);
    139.         Toast.makeText(mContext, desc, Toast.LENGTH_SHORT).show();
    140.     }
    141.  
    142. }

     

     

     

     

     

     

     

     

     

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  • 原文地址：https://blog.csdn.net/m0_61442607/article/details/126812629