Re: [android-developers] Re: Automate update every x secs get data from myUrl

[TreKing]

On Wed, Nov 21, 2012 at 12:58 PM, fernando arellano
wrote:

> I think the easy way to resolve it is create a service which always are
> running and notifying to the activity, this service should run a thread to
> check periodically the data from the web service.


Having a service which "always are running" is not only not really
possible, but a terrible drain on resources. Your app will appear to be
running all the time. Again, you should use AlarmManager to schedule work
that occurs periodically.

-
TreKing  - Chicago
transit tracking app for Android-powered devices

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[android-developers] Re: Automate update every x secs get data from myUrl

[fernando arellano]

I think the easy way to resolve it is create a service which always are 
running and notifying to the activity, this service should run a thread to 
check periodically the data from the web service.

public class ViewSlideService extends Service {

public static final String TAG = "ViewSlideService";

Updater updater;

private final int DELAY = 3000;


private boolean isRunning = false;

Messenger outMessenger;

@Override
public void onCreate() {
super.onCreate();
updater = new Updater();
Log.v(TAG, "onCreate");
}

@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.v(TAG, "onStart");
licenseSeat = QwizdomCommon.licenseSeat;
isRunning = true;
updater.start();

}

@Override
public void onDestroy() {
super.onDestroy();
isRunning = false;
updater.interrupt();
updater = null;
// QwizdomWS.releaseSessionSeat(QwizdomCommon.licenseSeat.getSeatKey()); // 
May be to finish we must release the session seat.
Log.v(TAG, "onDestroy");
}

@Override
public IBinder onBind(Intent intent) {
Log.v(TAG, "onBind");
Bundle extras = intent.getExtras();
if (extras != null) {
outMessenger = (Messenger) extras.get("MESSENGER");
}
return null;
}

private class Updater extends Thread {

@Override
public void run() {
super.run();
while (isRunning) {
UpdateResult update;
try {
//Get data from web service
Thread.sleep(DELAY);
} catch (Exception e1) {
e1.printStackTrace();
}
}
}

}

}

you can see this link for more info about how create a service:
http://stackoverflow.com/questions/4300291/example-communication-between-activity-and-service-using-messaging

El miércoles, 21 de noviembre de 2012 10:40:03 UTC-8, Antonis Kanaris 
escribió:
>
> Hello.I am new developer android and i want to make an application read 
> data from my webserver and control my arduino board...
> I start with this example .for get data...ok work but only when click 
> buttoni want to convert to automatic update.How i make this?.
>
> public class ReadWebpageAsyncTask extends Activity {
>   private TextView textView;
>
>   
> /** Called when the activity is first created. */
>
>   @Override
>   public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.activity_read_webpage_async_task);
> textView = (TextView) findViewById(R.id.textView1);
>   }
>
>   private class DownloadWebPageTask extends AsyncTask String> {
> @Override
> protected String doInBackground(String... urls) {
>   String response = "";
>   for (String url : urls) {
> DefaultHttpClient client = new DefaultHttpClient();
> HttpGet httpGet = new HttpGet(url);
> try {
>   HttpResponse execute = client.execute(httpGet);
>   InputStream content = execute.getEntity().getContent();
>
>   BufferedReader buffer = new BufferedReader(new 
> InputStreamReader(content));
>   String s = "";
>   while ((s = buffer.readLine()) != null) {
> response += s;
>   }
>
> } catch (Exception e) {
>   e.printStackTrace();
> }
>   }
>   return response;
> }
>
> @Override
> protected void onPostExecute(String result) {
>   textView.setText(result);
> }
>   }
>
>   public void readWebpage(View view) {
> DownloadWebPageTask task = new DownloadWebPageTask();
> task.execute(new String[] { "http://www.mysite.net/LEDstate.txt"; });
>
>   }
> } 
>
>
>

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