Foreground thread that reads from logcat is paused in Android ICS

Question

I have an application that starts a thread in background. This thread read the logcat:

public class MonitorLogService extends Service{

...

    private void handleCommand(Intent intent){
    if (ACTION_FOREGROUND.equals(intent.getAction())) {
        // In this sample, we'll use the same text for the ticker and the expanded notification
        CharSequence text = getText(R.string.app_name);

        // Set the icon, scrolling text and timestamp
        Notification notification = new Notification(R.drawable.stat_notify, text, System.currentTimeMillis());

        // The PendingIntent to launch our activity if the user selects this notification
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, ConfigActivity.class), 0);

        // Set the info for the views that show in the notification panel.
        notification.setLatestEventInfo(this, text,getText(R.string.service_running), contentIntent);
        startForegroundCompat(R.string.service_running, notification);

        monitorLogThread = new MonitorLogThread();
        monitorLogThread.start();
    }
}

private static Thread monitorLogThread;

private class MonitorLogThread extends Thread{

    BufferedReader br; 

    @Override
    public void run() {
        try {   

                Process process;
                process = Runtime.getRuntime().exec("logcat -c");
                process = Runtime.getRuntime().exec("logcat -b events");
                br = new BufferedReader(new InputStreamReader(process.getInputStream()));
                String line;

                // Lee mientras no haya líneas nulas o el proceso se interrumpa
                while(((line=br.readLine()) != null) && !this.isInterrupted()){
                    Log.d("MyApp",line);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
    }
}

Everything works fine in Android 2.3 but I have a problem in Android 4: "br.readLine()" doesn't return any line when I leave the app, it's just paused. When I open again the application, the service return the logcat lines.

I don't understand what happend because in Android 2.3 everything works fine.

Thanks

Answer 1

Unfortunately the API 16 doesn't support the logs reading permission as I found here.