And note that holding a partial wake lock will have a *very* noticeable
impact on battery life.
On Fri, Sep 9, 2011 at 3:18 PM, nexbug <gsuku...@gmail.com> wrote:
> Get the lock in the oncreate of the service and release it at the end
> of the thread
>
> On Sep 9, 4:41 am, Evelyon <evely...@gmail.com> wrote:
> > I have got a service which runs a thread. The thread save some data in
> > a file (in the sdcard). When Android goes to sleep, I need that the
> > service and the thread continue running. I tried it with a
> > PARTIAL_WAKE_LOCK, but it doesn't work; the thread stops while Android
> > is sleeping. Other locks like FULL_WAKE_LOCK works, but I need to use
> > PARTIAL_WAKE_LOCK because, in the future, in that thread I will read
> > from a serial port and I don't care the screen turn off.
> >
> > I don't know if I have some mistake in the code, or if I don't
> > understand the PARTIAL_WAKE_LOCK. Somebody can tell me why my solution
> > doesn't wrok?
> >
> > This is part of the code of the main activity, where the service is
> > stareted:
> >
> > public void onClick(View v) {
> > if (SerialPortService.WAKELOCK == null) {
> > PowerManager pm = (PowerManager)
> > getSystemService(Context.POWER_SERVICE);
> > SerialPortService.WAKELOCK =
> > pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
> > SerialPortService.WL_TAG);
> > SerialPortService.WAKELOCK.acquire();
> > startService(new Intent(getApplicationContext(),
> > SerialPortService.class));
> > }
> > }
> >
> > This is the code of the service:
> >
> > public class SerialPortService extends Service {
> >
> > public static String WL_TAG = "serial_port_wl_tag";
> > public static PowerManager.WakeLock WAKELOCK = null;
> > private BufferedWriter out = null;
> >
> > public IBinder onBind(Intent intent) {
> > return null;
> > }
> >
> > public void onCreate() {
> > super.onCreate();
> > try {
> > File root = Environment.getExternalStorageDirectory();
> > if (root.canWrite()){
> > File dataFile = new File(root, "batterytest.txt");
> > FileWriter dataFileWritter = new
> > FileWriter(dataFile);
> > out = new BufferedWriter(dataFileWritter);
> > }
> > } catch (IOException ioe) {
> > Log.d("TEST", "Could not open file " +
> > ioe.getMessage());
> > }
> > readThread = new ReadThread();
> > readThread.start();
> > }
> >
> > public void onDestroy() {
> > if (readThread != null) readThread.interrupt();
> > WAKELOCK.release();
> > WAKELOCK = null;
> > try {
> > out.close();
> > } catch (IOException ioe) {
> > Log.d("TEST", "Could not close file " +
> > ioe.getMessage());
> > }
> > super.onDestroy();
> > }
> >
> > private class ReadThread extends Thread {
> > public void run() {
> > super.run();
> > while (!isInterrupted()) {
> > try {
> > Thread.sleep(5000);
> > if (out != null) {
> > Calendar now = Calendar.getInstance();
> > out.write(now.getTime().toString());
> > out.newLine();
> > } catch (IOException ioe) {
> > Log.d("TEST", "Could not read file " +
> > ioe.getMessage());}
> > return;
> > } catch (InterruptedException e) {
> > return;
> > }
> > }
> > }
> >
> > }
> >
> > }
>
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--
Dianne Hackborn
Android framework engineer
hack...@android.com
Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails. All such
questions should be posted on public forums, where I and others can see and
answer them.
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