View（视图）——ListView之GridView

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.wang.testapp2.TestActivity10">
11 
12     <GridView
13         android:layout_width="match_parent"
14         android:layout_height="match_parent"
15         android:id="@+id/gv_1"
16         android:numColumns="4"
17         android:stretchMode="columnWidth"
18         android:gravity="center"
19         android:horizontalSpacing="30dp"
20         android:verticalSpacing="30dp"
21         android:columnWidth="120dp"
22         ></GridView>
23 
24 </LinearLayout>

  1 package com.example.wang.testapp2;
  2 
  3 import android.app.ActionBar;
  4 import android.support.v7.app.AppCompatActivity;
  5 import android.os.Bundle;
  6 import android.util.Log;
  7 import android.view.View;
  8 import android.view.ViewGroup;
  9 import android.widget.AbsListView;
 10 import android.widget.AdapterView;
 11 import android.widget.BaseAdapter;
 12 import android.widget.GridView;
 13 import android.widget.ImageView;
 14 import android.widget.ListView;
 15 import android.widget.TextView;
 16 import android.widget.Toast;
 17 
 18 import java.util.ArrayList;
 19 import java.util.List;
 20 
 21 public class TestActivity10 extends AppCompatActivity {
 22 
 23     GridView gv_1;
 24 
 25 //    List<MyClass> lm;
 26     List<Integer> liv;
 27 
 28     @Override
 29     protected void onCreate(Bundle savedInstanceState) {
 30         super.onCreate(savedInstanceState);
 31         setContentView(R.layout.activity_test10);
 32 
 33         GridView gv_1=(GridView)findViewById(R.id.gv_1);
 34 
 35 //        lm=new ArrayList<>();
 36 //
 37 //        MyClass myClass=new MyClass(R.drawable.f1,"美食1");
 38 //
 39 //        lm.add(myClass);
 40 //
 41 //        lm.add(new MyClass(R.drawable.f2,"美食2"));
 42 //        lm.add(new MyClass(R.drawable.f3,"美食3"));
 43 //        lm.add(new MyClass(R.drawable.f4,"美食4"));
 44 //        lm.add(new MyClass(R.drawable.f5,"美食5"));
 45 //        lm.add(new MyClass(R.drawable.f6,"美食6"));
 46 //        lm.add(new MyClass(R.drawable.f7,"美食7"));
 47 //        lm.add(new MyClass(R.drawable.f8,"美食8"));
 48 //        lm.add(new MyClass(R.drawable.f9,"美食9"));
 49 //        lm.add(new MyClass(R.drawable.f10,"美食10"));
 50 //
 51 //        GridAdapter gridAdapter=new GridAdapter();
 52 //
 53 //        gv_1.setAdapter(gridAdapter);
 54 
 55 
 56 
 57 
 58 
 59         //1 数据 图片的id
 60         liv =new ArrayList<>();
 61         liv.add(R.drawable.f1);
 62         liv.add(R.drawable.f2);
 63         liv.add(R.drawable.f3);
 64         liv.add(R.drawable.f4);
 65         liv.add(R.drawable.f5);
 66         liv.add(R.drawable.f6);
 67         liv.add(R.drawable.f7);
 68         liv.add(R.drawable.f8);
 69         liv.add(R.drawable.f9);
 70         liv.add(R.drawable.f10);
 71 
 72         final ImageAdapter im=new ImageAdapter();
 73 
 74         gv_1.setAdapter(im);
 75 
 76         gv_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 77             @Override
 78             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 79 
 80                 Toast.makeText(TestActivity10.this, "被点击的图片索引=" + position, Toast.LENGTH_SHORT).show();
 81             }
 82         });
 83 
 84         //长按删除的监听器
 85         gv_1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
 86             @Override
 87             public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
 88 
 89                 //1.删除数据
 90                 // 从集合里删除长按的数据
 91                 liv.remove(position);
 92 
 93                 //2.刷新视图，看到效果
 94                 // 通知适配器，数据源改变了
 95                 im.notifyDataSetChanged();
 96 
 97                 Toast.makeText(TestActivity10.this, "删除了记录索引="+position, Toast.LENGTH_SHORT).show();
 98 
 99                 return true;//事件已经被消费，不要在处理了
100             }
101         });
102     }
103 
104 //    class  MyClass
105 //    {
106 //        private int img;
107 //
108 //        private String name;
109 //
110 //
111 //        public int getImg() {
112 //            return img;
113 //        }
114 //
115 //        public void setImg(int img) {
116 //            this.img = img;
117 //        }
118 //
119 //        public String getName() {
120 //            return name;
121 //        }
122 //
123 //        public void setName(String name) {
124 //            this.name = name;
125 //        }
126 //
127 //        public MyClass(int img,String name)
128 //        {
129 //            this.img=img;
130 //            this.name=name;
131 //        }
132 //    }
133 
134 
135      //适配器
136 
137     class  ImageAdapter extends BaseAdapter
138     {
139         @Override
140         public int getCount() {
141             return liv.size();
142         }
143 
144         @Override
145         public Object getItem(int position) {
146             return liv.get(position);
147         }
148 
149         @Override
150         public long getItemId(int position) {
151             return 0;
152         }
153 
154         @Override
155         public View getView(int position, View convertView, ViewGroup parent) {
156 
157             //1. 得到数据 图片的id
158             Integer ivid = liv.get(position);
159 
160             //2.准备View
161             if (convertView == null) {
162                 convertView = new ImageView(TestActivity10.this);
163             }
164 
165             //3.适配
166             // 转换
167             ImageView imageView = (ImageView) convertView;
168 
169             imageView.setImageResource(ivid);
170 
171 //            imageView.setMaxWidth(70);
172 //            imageView.setMaxHeight(70);
173 
174             imageView.setLayoutParams(new GridView.LayoutParams(110, 110));
175 
176 
177             return imageView;
178 
179 //    class GridAdapter extends BaseAdapter
180 //    {
181 //        @Override
182 //        public int getCount() {
183 //            return lm.size();
184 //        }
185 //
186 //        @Override
187 //        public Object getItem(int position) {
188 //            return lm.get(position);
189 //        }
190 //
191 //        @Override
192 //        public long getItemId(int position) {
193 //            return 0;
194 //        }
195 //
196 //        @Override
197 //        public View getView(int position, View convertView, ViewGroup parent) {
198 //            MyClass myClass=lm.get(position);
199 //
200 //            if (convertView==null)
201 //            {
202 //                Log.e("TAG","适配器getView="+position);
203 //
204 //                convertView=View.inflate(TestActivity10.this,R.layout.listview_layout,null);
205 //            }
206 //
207 //            ImageView imageView=(ImageView)convertView.findViewById(R.id.iv_3);
208 //            imageView.setImageResource(myClass.getImg());
209 //
210 //            TextView textView=(TextView)convertView.findViewById(R.id.tv_9);
211 //            textView.setText(myClass.getName());
212 //
213 //
214 //            return convertView;
215 //        }
216 //    }
217         }}
218 }