El servicio se bloquea con nullpointerexception en onCreate
Quería verificar la hora real cada 5 minutos en un servicio y silenciar o activar el teléfono según la hora. antes intenté usar un rato (verdadero) con thread.sleep (300000) al final, pero se bloqueó siempre con un ANR, así que intenté usar una tarea de temporizador pero ahora se bloquea justo después de la líneaAudioManager audioManager = (AudioManager)this.getSystemService(Context.AUDIO_SERVICE); con una NullPointerException
package de.nathan.android.droidschool;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.os.IBinder;
import java.io.File;
import java.util.GregorianCalendar;
import java.util.Timer;
import java.util.TimerTask;
/**
* Created by nathan on 29.08.13.
*/
public class MuteService extends Service
{
Timer myTimer = new Timer();
MyTimerTask myTimerTask= new MyTimerTask();
AudioManager audioManager = (AudioManager)this.getSystemService(Context.AUDIO_SERVICE);
public void onCreate()
{
super.onCreate();
}
public int onStartCommand(Intent intent, int i1, int i2)
{
super.onStartCommand(intent, i1, i2);
myTimer.scheduleAtFixedRate(myTimerTask, 0, 600000); //(timertask,delay,period)
return START_STICKY;
}
public MuteService()
{
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private class MyTimerTask extends TimerTask {
@Override
public void run() {
GregorianCalendar cal = new GregorianCalendar();
String tag = null;
switch (cal.get(GregorianCalendar.DAY_OF_WEEK))
{
case GregorianCalendar.MONDAY:
tag = "Montag";
break;
case GregorianCalendar.TUESDAY:
tag = "Dienstag";
break;
case GregorianCalendar.WEDNESDAY:
tag = "Mittwoch";
break;
case GregorianCalendar.THURSDAY:
tag = "Donnerstag";
break;
case GregorianCalendar.FRIDAY:
tag = "Freitag";
break;
}
int i = 0;
while (i <= 10)
{
File f = new File("/sdcard/" + i + tag + "fach.txt");
if(!f.exists()) break;
i++;
}
i--;
int endHr = 0;
int endMin = 0;
switch (i)
{
case 0:
endHr = 8;
endMin = 30;
break;
case 1:
endHr = 9;
endMin = 20;
break;
case 2:
endHr = 10;
endMin = 20;
break;
case 3:
endHr = 11;
endMin = 10;
break;
case 4:
endHr = 12;
endMin = 5;
break;
case 5:
endHr = 12;
endMin = 55;
break;
case 6:
endHr = 13;
endMin = 55;
break;
case 7:
endHr = 14;
endMin = 45;
break;
case 8:
endHr = 15;
endMin = 35;
break;
case 9:
endHr = 16;
endMin = 25;
break;
case 10:
endHr = 17;
endMin = 15;
break;
}
if (cal.get(GregorianCalendar.HOUR_OF_DAY) < endHr)
{
audioManager.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
} else if (cal.get(GregorianCalendar.HOUR_OF_DAY) == endHr && cal.get(GregorianCalendar.MINUTE) <= endMin + 5)
{
audioManager.setRingerMode(AudioManager.RINGER_MODE_VIBRATE);
} else
{
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_RING);
if (audioManager.getRingerMode() == AudioManager.RINGER_MODE_VIBRATE || audioManager.getRingerMode() == AudioManager.RINGER_MODE_SILENT)
{
audioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
audioManager.setStreamVolume(AudioManager.STREAM_RING, maxVolume, AudioManager.FLAG_SHOW_UI + AudioManager.FLAG_PLAY_SOUND);
}
}
}
}
}
LogCat:
08-30 12:44:04.508 23294-23294/de.nathan.android.droidschool D/AndroidRuntime: Shutting down VM
08-30 12:44:04.508 23294-23294/de.nathan.android.droidschool W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41ce6700)
08-30 12:44:04.538 23294-23294/de.nathan.android.droidschool E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate service de.nathan.android.droidschool.MuteService: java.lang.NullPointerException
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2561)
at android.app.ActivityThread.access$1600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1338)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.content.ContextWrapper.getSystemService(ContextWrapper.java:519)
at de.nathan.android.droidschool.MuteService.<init>(MuteService.java:21)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1130)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:2558)
... 10 more
08-30 12:44:04.548 440-1477/? W/ActivityManager: Force finishing activity de.nathan.android.droidschool/.MainActivity
08-30 12:44:04.848 440-1477/? I/WindowManager: Screenshot max retries 4 of Token{42d5f4e8 ActivityRecord{42624258 u0 de.nathan.android.droidschool/.MainActivity}} appWin=Window{42cc6e50 u0 Starting de.nathan.android.droidschool} drawState=4
08-30 12:44:05.358 440-458/? W/ActivityManager: Activity pause timeout for ActivityRecord{42624258 u0 de.nathan.android.droidschool/.MainActivity}
08-30 12:44:07.068 440-458/? W/ActivityManager: Timeout executing service: ServiceRecord{4330adf8 u0 de.nathan.android.droidschool/.MuteService}
08-30 12:44:07.068 440-458/? I/ActivityManager: Crashing app skipping ANR: ProcessRecord{42cf6020 23294:de.nathan.android.droidschool/u0a10018} Executing service de.nathan.android.droidschool/.MuteService
08-30 12:44:15.518 440-458/? W/ActivityManager: Activity destroy timeout for ActivityRecord{42624258 u0 de.nathan.android.droidschool/.MainActivity}