Sameer Z...

16

使用像我从服务器下载文件并放入SD卡的服务下载它的最佳方式也使用通知.它是相当长的代码,但我认为完美的一个,如果不明白任何事情,那么请去android开发者博客的服务.

public class DownloadService extends Service{

SharedPreferences preferences;

private static final String DOCUMENT_VIEW_STATE_PREFERENCES = "DjvuDocumentViewState";

private Looper mServiceLooper;

private ServiceHandler mServiceHandler;

private NotificationManager mNM;

String downloadUrl;

public static boolean serviceState=false;

// Handler that receives messages from the thread

private final class ServiceHandler extends Handler {

public ServiceHandler(Looper looper) {

super(looper);

}

@Override

public void handleMessage(Message msg) {

downloadFile();

showNotification(getResources().getString(R.string.notification_catalog_downloaded),"VVS");

stopSelf(msg.arg1);

}

}

@Override

public void onCreate() {

serviceState=true;

mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

HandlerThread thread = new HandlerThread("ServiceStartArguments",1);

thread.start();

// Get the HandlerThread's Looper and use it for our Handler

mServiceLooper = thread.getLooper();

mServiceHandler = new ServiceHandler(mServiceLooper);

}

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

Log.d("SERVICE-ONCOMMAND","onStartCommand");

Bundle extra = intent.getExtras();

if(extra != null){

String downloadUrl = extra.getString("downloadUrl");

Log.d("URL",downloadUrl);

this.downloadUrl=downloadUrl;

}

Message msg = mServiceHandler.obtainMessage();

msg.arg1 = startId;

mServiceHandler.sendMessage(msg);

// If we get killed, after returning from here, restart

return START_STICKY;

}

@Override

public void onDestroy() {

Log.d("SERVICE-DESTROY","DESTORY");

serviceState=false;

//Toast.makeText(this, "service done", Toast.LENGTH_SHORT).show();

}

@Override

public IBinder onBind(Intent intent) {

// We don't provide binding, so return null

return null;

}

public void downloadFile(){

downloadFile(this.downloadUrl,fileName);

}

void showNotification(String message,String title) {

// In this sample, we'll use the same text for the ticker and the expanded notification

CharSequence text = message;

// Set the icon, scrolling text and timestamp

Notification notification = new Notification(R.drawable.icon, "vvs",

System.currentTimeMillis());

notification.flags |= Notification.FLAG_AUTO_CANCEL;

Intent intent = new Intent(this, HomeScreenActivity.class);

intent.setFlags (Intent.FLAG_ACTIVITY_CLEAR_TOP);

//The PendingIntent to launch our activity if the user selects this notification

PendingIntent contentIntent = PendingIntent.getActivity(this.getBaseContext(), 0,

intent, PendingIntent.FLAG_CANCEL_CURRENT);

// Set the info for the views that show in the notification panel.

notification.setLatestEventInfo(this, title,

text, contentIntent);

// Send the notification.

// We use a layout id because it is a unique number. We use it later to cancel.

mNM.notify(R.string.app_name, notification);

}

public void downloadFile(String fileURL, String fileName) {

StatFs stat_fs = new StatFs(Environment.getExternalStorageDirectory().getPath());

double avail_sd_space = (double)stat_fs.getAvailableBlocks() *(double)stat_fs.getBlockSize();

//double GB_Available = (avail_sd_space / 1073741824);

double MB_Available = (avail_sd_space / 10485783);

//System.out.println("Available MB : " + MB_Available);

Log.d("MB",""+MB_Available);

try {

File root =new File(Environment.getExternalStorageDirectory()+"/vvveksperten");

if(root.exists() && root.isDirectory()) {

}else{

root.mkdir();

}

Log.d("CURRENT PATH",root.getPath());

URL u = new URL(fileURL);

HttpURLConnection c = (HttpURLConnection) u.openConnection();

c.setRequestMethod("GET");

c.setDoOutput(true);

c.connect();

int fileSize = c.getContentLength()/1048576;

Log.d("FILESIZE",""+fileSize);

if(MB_Available <= fileSize ){

this.showNotification(getResources().getString(R.string.notification_no_memory),getResources().getString(R.string.notification_error));

c.disconnect();

return;

}

FileOutputStream f = new FileOutputStream(new File(root.getPath(), fileName));

InputStream in = c.getInputStream();

byte[] buffer = new byte[1024];

int len1 = 0;

while ((len1 = in.read(buffer)) > 0) {

f.write(buffer, 0, len1);

}

f.close();

File file = new File(root.getAbsolutePath() + "/" + "some.pdf");

if(file.exists()){

file.delete();

Log.d("FILE-DELETE","YES");

}else{

Log.d("FILE-DELETE","NO");

}

File from =new File(root.getAbsolutePath() + "/" + fileName);

File to = new File(root.getAbsolutePath() + "/" + "some.pdf");

} catch (Exception e) {

Log.d("Downloader", e.getMessage());

}

应用程序被杀后它是否有效？ (3认同)