意图服务是异步进行的 执行完操作后就会自己消毁（onDestroy方法）
本例为点击按钮下载三张图片相当于连续执行三次意图服务中的onStartcommand方法
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 }
MainActivity.java
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 }
DownLoadService.java
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>
activity_main.xml
至于服务的类都需要注册 这里就不写了
时间： 2024-12-21 14:04:41