IntentService----意图服务

 1 import android.app.Activity;
 2 import android.content.BroadcastReceiver;
 3 import android.content.Context;
 4 import android.content.Intent;
 5 import android.content.IntentFilter;
 6 import android.graphics.Bitmap;
 7 import android.os.Bundle;
 8 import android.view.View;
 9 import android.widget.ImageView;
10 import android.widget.RelativeLayout;
11 
12 public class MainActivity extends Activity {
13 
14     private ImageView img1View,img2View,img3View;
15     private RelativeLayout mainLayout;
16     
17     private ImgReceiver imgReceiver;
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         
23         mainLayout=(RelativeLayout) findViewById(R.id.mainLayoutId);
24         
25         img1View=(ImageView) findViewById(R.id.img1Id);
26         img2View=(ImageView) findViewById(R.id.img2Id);
27         img3View=(ImageView) findViewById(R.id.img3Id);
28         
29         img1View.setTag(Config.URL1);
30         img2View.setTag(Config.URL2);
31         img3View.setTag(Config.URL3);
32         
33         imgReceiver=new ImgReceiver();
34         registerReceiver(imgReceiver, 
35                 new IntentFilter(Config.ACTION_DOWNLOAD_COMPLETED));
36                 
37     }
38     
39     public void startDownload(View view){
40         Intent intent=new Intent(getApplicationContext(),DownloadService.class);
41         intent.putExtra("path", Config.URL1);
42         startService(intent); //涓嬭浇绗竴涓浘鐗?        
43         intent.putExtra("path", Config.URL2);
44         startService(intent); //涓嬭浇绗簩涓浘鐗?        
45         intent.putExtra("path", Config.URL3);
46         startService(intent); //涓嬭浇绗笁涓浘鐗?        
47     }
48     
49     @Override
50     protected void onDestroy() {
51         super.onDestroy();
52         unregisterReceiver(imgReceiver); //鍙栨秷娉ㄥ唽骞挎挱鎺ユ敹鍣?    
53         }
54     
55     class ImgReceiver extends BroadcastReceiver{
56         @Override
57         public void onReceive(Context context, Intent intent) {
58             // TODO 鎺ユ敹鍥剧墖涓嬭浇瀹屾垚鐨勫箍鎾?            
59             String url=intent.getStringExtra(Config.EXTRA_URL);
60             Bitmap bitmap=intent.getParcelableExtra(Config.EXTRA_BITMAP);
61             
62             //鏍规嵁Url浣滀负鐨勫浘鐗囨帶浠剁殑鏍囩鏌ユ壘鍥剧墖鎺т欢
63             ImageView imgView=(ImageView) mainLayout.findViewWithTag(url);
64             imgView.setImageBitmap(bitmap);
65         }
66     }
67 
68 }

 1 import java.io.ByteArrayOutputStream;
 2 import java.io.InputStream;
 3 import java.net.HttpURLConnection;
 4 import java.net.URL;
 5 
 6 import android.app.IntentService;
 7 import android.content.Intent;
 8 import android.graphics.Bitmap;
 9 import android.graphics.BitmapFactory;
10 import android.util.Log;
11 
12 /**
13  * IntentService鏄甫鏈夊瓙绾跨▼鐨勬湇鍔＄粍浠讹紝鍏跺唴閮ㄤ娇鐢ㄤ簡鍗曠嚎绋嬫睜妯″紡锛? * 褰撴墍鏈夌殑浠诲姟鎵ц瀹屾垚鍚庯紝浼氳嚜鍔ㄥ叧闂湰鏈嶅姟
14  * 鍏剁敓鍛藉懆鏈熸柟娉曪細
15  *     onCreate()
16  *     onStartCommand()
17  *     onHandleIntent() 鍦ㄥ瓙绾跨▼涓墽琛岀殑鏂规硶
18  *  onDestroy()
19  *     
20  * @author apple
21  *
22  */
23 public class DownloadService extends IntentService {
24     public DownloadService(){
25         super(null);//鍙傛暟锛氭槸璁剧疆瀛愮嚎绋嬬殑鍚嶇О
26     }
27     
28     @Override
29     public void onCreate() {
30         super.onCreate();
31         Log.i("debug", "--onCreate---");
32     }
33     @Override
34     public int onStartCommand(Intent intent, int flags, int startId) {
35         Log.i("debug", "--onStartCommand---");
36         return super.onStartCommand(intent, flags, startId);
37     }
38     
39     @Override
40     protected void onHandleIntent(Intent intent) {
41         // TODO 鍦ㄥ瓙绾跨▼涓墽琛岀殑鏂规硶
42         Log.i("debug", "--onHandleIntent---");
43         //鑾峰彇涓嬭浇鍥剧墖鐨勫湴鍧?        
44         String path=intent.getStringExtra("path");
45         try{
46             URL url=new URL(path);
47             HttpURLConnection conn=(HttpURLConnection) url.openConnection();
48             InputStream is=conn.getInputStream();
49             byte[] buffer=new byte[10*1024];//姣忔璇诲彇瀛楄妭鐨勬渶澶ф暟
50             int len=-1;
51             
52             ByteArrayOutputStream baos=new ByteArrayOutputStream();
53             if(conn.getResponseCode()==200){
54                 while((len=is.read(buffer))!=-1){
55                     baos.write(buffer, 0, len);
56                 }
57                 
58                 byte[] bytes=baos.toByteArray();
59                 //灏嗕笅杞藉畬鎴愮殑瀛楄妭鏁扮粍杞垚鍥剧墖瀵硅薄
60                 Bitmap bitmap=BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
61                 
62                 //灏嗗浘鐗囧璞″彂閫佺粰Activity杩涜鏄剧ず
63                 Intent bitmapIntent=new Intent(Config.ACTION_DOWNLOAD_COMPLETED);
64                 bitmapIntent.putExtra(Config.EXTRA_BITMAP,bitmap);
65                 bitmapIntent.putExtra(Config.EXTRA_URL, path);
66                 
67                 sendBroadcast(bitmapIntent);
68                 
69                 Thread.sleep(2000);//浠呮祴璇曟椂浣跨敤
70             }
71             
72         }catch(Exception e){
73             e.printStackTrace();
74         }
75         
76     }
77     
78     @Override
79     public void onDestroy() {
80         super.onDestroy();
81         Log.i("debug", "--onDestroy---");
82     }
83 
84 }

 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     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context=".MainActivity" 
10     android:id="@+id/mainLayoutId">
11 
12     <Button
13         android:id="@+id/btnId"
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:onClick="startDownload"
17         android:text="开始下载" />
18     
19     <ImageView
20         android:id="@+id/img1Id"
21         android:layout_width="100dp"
22         android:layout_height="90dp"
23         android:scaleType="centerCrop"
24         android:layout_margin="5dp" 
25         android:layout_below="@id/btnId"/>
26     
27     <ImageView
28         android:id="@+id/img2Id"
29         android:layout_width="100dp"
30         android:layout_height="90dp"
31         android:scaleType="centerCrop"
32         android:layout_margin="5dp" 
33         android:layout_below="@id/btnId"
34         android:layout_toRightOf="@id/img1Id"/>
35     
36       <ImageView
37         android:id="@+id/img3Id"
38         android:layout_width="100dp"
39         android:layout_height="90dp"
40         android:scaleType="centerCrop"
41         android:layout_margin="5dp" 
42         android:layout_below="@id/img1Id"/>
43 
44 </RelativeLayout>