app离线下载

 1 public static final int CANCEL_STATE = 1 ;
 2 
 3 private state int state ;
 4 
 5 ...
 6 
 7 //download
 8 
 9  
10 
11 while ( ... ) {
12 
13 ...
14 
15 if ( state == CANCEL_STATE ) {
16 
17 break ;
18 
19 }
20 
21 }

1 File file = new File ( path ) ;
2 
3 file.getParentFile().mkdirs () ;
4 
5 RandomAccessFile rdFile = new RandomAccessFile ( file, "rwd" ) ;

1 int mCurrentSize = ( int ) rdFile.length () ;
2 
3 HttpURLConnection conn = ( HttpURLConnection ) new URL ( url ).openConnection () ;
4 
5 conn.setConnectTimeout ( 5000 ) ;
6 
7 conn.setRequestMethod ( "get" ) ;

 1 public abstract class BaseIntentService extends Service {
 2 
 3 private final int MESSAGE_TYPE = 12 ; //消息类型
 4 
 5  
 6 
 7 @Override
 8 
 9 public void onStart ( Intent intent, int startId ) {
10 
11 Message msg = mServiceHandler.obtainMessage () ;
12 
13 msg.arg1 = startId ;
14 
15 msg.obj = intent ;
16 
17 msg.what = MESSAGE_TYPE ;
18 
19 mServiceHandler.sendMessage ( msg ) ;
20 
21 }
22 
23  
24 
25 protected boolean hasIntent ( Intent intent ) {
26 
27 return mServiceHandler.hasMessages ( MESSAGE_TYPE, intent ) ;
28 
29 }
30 
31  
32 
33 protected void removeIntent ( Intent intent ) {
34 
35 if ( mServiceHandler.hasMessages ( MESSAGE_TYPE, intent ) ) {
36 
37 mServiceHandler.removeMessages ( MESSAGE_TYPE, intent ) ;
38 
39 }
40 
41 }
42 
43  
44 
45 protected void removeAllIntent () {
46 
47 mServiceHandler.removeMessages ( MESSAGE_TYPE ) ;
48 
49 }
50 
51 }

 1 public class NetworkUtils {
 2 
 3 public static boolean existWifi ( Context context ) {
 4 
 5 ConnectivityManager connManager = ( ConnectivityManager ) context.getSystemService ( Context.CONNECTIVITY_SERVICE ) ;
 6 
 7 NetworkInfo info = connManager.getActiveNetworkInfo () ;
 8 
 9 return ( null != info && ConnectivityManager.TYPE_WIFI == info.getType () ) ;
10 
11 }
12 
13 }

 1 public class SDUtils {
 2 
 3 public static boolean existSDCard () {
 4 
 5 return ( android.os.Environment.getExternalStorageStage().
 6 
 7 equals( android.os.Environment.MEDIA_MOUNTED ) ) ;
 8 
 9 }
10 
11 }

 1 public class MainActivity extends Activity {
 2 
 3 ...
 4 
 5  
 6 
 7 public void startDownload () {
 8 
 9 Intent intent = new ...
10 
11 intent.putExtra ( "receiver", new DownloadReceiver() ) ;
12 
13 ...
14 
15 startService ( intent ) ;
16 
17 }
18 
19  
20 
21 public class DownloadReceiver extends ResultReceiver {
22 
23 ...
24 
25 }
26 
27  
28 
29 }

1 Bundle resultData = new Bundle () ;
2 
3 resultData.putString ( "progress", percent ) ;
4 
5 receiver.send ( UPDATE_PROGRESS, resultData ) ;

 1 public static void startAlarm ( Context context, long time ) {
 2 
 3 AlarmManager am = (AlarmManager) context.getSystemService ( Context.ALARM_SERVICE ) ;
 4 
 5 Intent intent = new Intent ( context, AlarmReceiver.class ) ;
 6 
 7 PendingIntent pIntent = PendingIntent.getBroadcast ( context, 0, intent, 0 ) ;
 8 
 9 am.cancel ( pIntent ) ;
10 
11 am.setRepeating ( AlarmManager.RTC_WAKEUP, time, AlarmManager.INTERVAL_DAY, pIntent ) ;
12 
13 }
14 
15  
16 
17 public class AlarmReceiver extends BroadcastReceiver {
18 
19 @Override
20 
21 public void onReceive ( Context context, Intent intent ) {
22 
23 //启动下载服务
24 
25 。。。
26 
27 }
28 
29 }

 1 public class WakeLockUtils {
 2 
 3 public static WakeLock wl ;
 4 
 5 public static String tag ; // 服务的包名
 6 
 7  
 8 
 9 public static void acquirePratialWakeLock ( Context context ) {
10 
11 if ( null != wl ) return ;
12 
13 PowerManager pm = ( PoweerManager ) ( context.getSystemService ( Context.POWER_SERVICE ) ) ;
14 
15 wl = pm.newWakeLock ( PowerManager.PARTIAL_WAKE_LOCK, tag ) ;
16 
17 wl.acquire () ;
18 
19 }
20 
21  
22 
23 public static void releaseWakeLock () {
24 
25 if ( null != wl && wl.isHeld () ) {
26 
27 wl.release () ;
28 
29 wl = null ;
30 
31 }
32 
33 }
34 
35 }
36 
37  

 1 public AutoRunReceiver extends BroadcastReceiver {
 2 
 3 public void onReceive ( Context context, Intent intent ) {
 4 
 5 //启动定时器
 6 
 7  
 8 
 9 。。。startAlram () ;
10 
11 }
12 
13 }

 1 <receiver android:name="包名">
 2 
 3 <intent-filter>
 4 
 5 <action android:name="android.intent.action.BOOT_COMPLETED"/>
 6 
 7 <category android:name="android.intent.category.HOME"/>
 8 
 9 </intent-filter>
10 
11 </receiver>