比较强大 优秀的开源框架 ：Android图片加载与缓存：Android Glide 的用法

 1 package com.example.testglide;
 2 
 3 import com.bumptech.glide.Glide;
 4 
 5 import android.app.Activity;
 6 import android.content.Context;
 7 import android.os.Bundle;
 8 import android.view.LayoutInflater;
 9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.widget.ArrayAdapter;
12 import android.widget.ImageView;
13 import android.widget.ListView;
14 import android.widget.TextView;
15 
16 public class MainActivity extends Activity {
17     // 网络图片地址
18     private String Url = "http://img3.imgtn.bdimg.com/it/u=1183223528,3058066243&fm=21&gp=0.jpg";
19     private MyAdapter mMyAdapter;
20 
21     @Override
22     protected void onCreate(Bundle savedInstanceState) {
23         super.onCreate(savedInstanceState);
24         setContentView(R.layout.activity_main);
25 
26         ListView lv = (ListView) findViewById(R.id.lv);
27         mMyAdapter = new MyAdapter(this, -1);
28 
29         lv.setAdapter(mMyAdapter);
30 
31     }
32 
33     private class MyAdapter extends ArrayAdapter {
34         private Context context;
35         LayoutInflater flater;
36 
37         public MyAdapter(Context context, int resource) {
38             super(context, resource);
39             this.context = context;
40             flater = LayoutInflater.from(context);
41         }
42 
43         @Override
44         public int getCount() {
45             return 100;
46         }
47 
48         @Override
49         public View getView(int position, View convertView, ViewGroup parent) {
50             if (convertView == null)
51                 convertView = flater.inflate(R.layout.list, null);
52 
53             ImageView iv = (ImageView) convertView.findViewById(R.id.iv);
54 
55             TextView tv = (TextView) convertView.findViewById(R.id.tv);
56 
57             tv.setText(position + "");
58             // placeholder(R.drawable.jinchengtu)这个是加载本地图片 实现加载网络图片过渡用 优化用户体验
59             // crossFade(1000) 设置显示图片淡出时间
60 
61             Glide.with(context).load(Url).placeholder(R.drawable.jinchengtu).crossFade(1000).into(iv);
62 
63             return convertView;
64         }
65 
66     }
67 
68 }

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context="com.example.testglide.MainActivity" >
 6 
 7     <ListView
 8         android:id="@+id/lv"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:layout_centerInParent="true" />
12 
13 </RelativeLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <ImageView
 8         android:id="@+id/iv"
 9         android:layout_width="match_parent"
10         android:layout_height="wrap_content" />
11 
12     <TextView
13         android:id="@+id/tv"
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:background="#00ff00" />
17 
18 </LinearLayout>