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I have a button that when pressed, starts a service. This service starts logging information from the device. However, when I press the run, the screen temporarily freezes for about 8 seconds whilst it logs, and then once it is finished the screen unfreezes, a toast message shows (that's meant to show as soon as you press the button) and then I can do whatever. If i go on the application screen again, when the application is logging (note: the service is always running so that doesnt freeze it, just the logging) then the activity is frozen again and doesnt let me do anything until the logging is complete.
I have tried asynctasks and running on a new runnable/new thread but none of these have seemed to work for me. Whether i am implementing them correctly or not I'm unsure, but I'd like to fix the problem.
Here is my onStartCommand in the service class:
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// THIS WOULD BE THE METHOD THAT RUNS WHATEVER YOU WANT TO DO EVERY SO OFTEN SO FOR ME THIS IS GETTING ALL DATA ETC
getProcessInfo();
// LOG DELAY = SECONDS BETWEEN RUNNING SERVICE/METHOD. SET AT THE TOP
myPendingIntent = PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
Alarmmgr.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+LOG_DELAY*1000, myPendingIntent);
Intent notificationIntent = new Intent(this, LogOrCheck.class);
PendingIntent contentIntent = PendingIntent.getActivity(this,
101, notificationIntent,
PendingIntent.FLAG_NO_CREATE);
NotificationManager nm = (NotificationManager) this
.getSystemService(Context.NOTIFICATION_SERVICE);
Resources res = this.getResources();
Notification.Builder builder = new Notification.Builder(this);
builder.setContentIntent(contentIntent)
.setSmallIcon(R.drawable.arrow_up_float)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.arrow_down_float))
.setWhen(System.currentTimeMillis())
.setAutoCancel(true)
.setContentTitle("Androigenius")
.setContentText("Service running OK");
Notification n = builder.getNotification();
startForeground(100, n);
return Service.START_STICKY;
And here is where I call startService:
but1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (isClicked) {
Context context = getApplicationContext();
Toast toast = Toast.makeText(context, "Please press 'MINIMIZE' at the top to continue logging.", Toast.LENGTH_LONG);
toast.setGravity(Gravity.TOP|Gravity.RIGHT, 10, 55);
toast.show();
System.out.println("Start logging");
but1.setText("Stop Logging");
but1.setTextColor(Color.RED);
// START SERVICE, DONE. (STOP IS BELOW).
startService(myIntent);
isClicked = false;
else if (!isClicked) {
System.out.println("Stop Logging");
but1.setText("Start Logging");
// STOP SERVICE, DONE.
stopService(myIntent);
but1.setTextColor(getResources().getColor(color.cornblue));
isClicked = true;
–
Services run on the UI thread which is causing the 'freeze'. Using an IntentService will create a service that automatically runs in the background, not on the UI thread. Here is some details of the IntentService class:
IntentService Class
By default, the Service also run in the main thread of your applicaiton, in which your UI operations occur. Therefore, if you perform a long task in your onStartCommand() method, it will block the main thread.
To avoid the problem, you have to migration the logging task into a separate thread. You may use AsycTask class to do so. Please refer to http://developer.android.com/reference/android/os/AsyncTask.html for how to use the class.
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