Wakelock "DoNotSleep“继续崩溃

Question

我最后一个问题：我的应用程序崩溃仅仅是因为唤醒"DoNotSleep“

我添加了一行: wakeLock.acquire()；

但我的问题还在继续。：

那是我的逻辑猫：

05-15 12:46:29.316: E/AndroidRuntime(2066): FATAL EXCEPTION: main

05-15 12:46:29.316: E/AndroidRuntime(2066): java.lang.RuntimeException: WakeLock under-locked DoNotSleep

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.os.PowerManager$WakeLock.release(PowerManager.java:945)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.os.PowerManager$WakeLock.release(PowerManager.java:916)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at com.example.iw84u.GpsTracker.UpdateWithNewLocation(GpsTracker.java:190)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at com.example.iw84u.GpsTracker.access$0(GpsTracker.java:169)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at com.example.iw84u.GpsTracker$MyLocationList.onLocationChanged(GpsTracker.java:213)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:261)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:189)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:206)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.os.Handler.dispatchMessage(Handler.java:99)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.os.Looper.loop(Looper.java:137)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at android.app.ActivityThread.main(ActivityThread.java:5293)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at java.lang.reflect.Method.invokeNative(Native Method)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at java.lang.reflect.Method.invoke(Method.java:511)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)

05-15 12:46:29.316: E/AndroidRuntime(2066):     at dalvik.system.NativeStart.main(Native Method)

在我的代码中：

public void onCreate() {
        super.onCreate();
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "DoNotSleep");
        wakeLock.acquire();
}
public void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();



    }
public int onStartCommand(Intent intent, int flags, int startId) {
    // Here there's some calculations with the intent

        return START_REDELIVER_INTENT;

    }
private void UpdateWithNewLocation(final Location loc) {
 wakeLock.release();
//Some commands and then .....
 stopSelf(); 
}

注意:我更改了wakeLock.release()；并将其放在函数UpdateWithNewLocation( function )的开头，因为否则它不会停止。

现在我的问题是，我仍然收到错误消息。

Answer 1

如果锁释放的次数比获得的时间多(来源)，则会发生此异常：

    public void release()
    {
        synchronized (mToken) {
            if (!mRefCounted || --mCount == 0) {
                try {
                    mService.releaseWakeLock(mToken);
                } catch (RemoteException e) {
                }
                mHeld = false;
            }
            if (mCount < 0) {
                throw new RuntimeException("WakeLock under-locked " + mTag);
            }
        }
    }

您只获得一次锁(在onCreate中)，但多次释放它(在UpdateWithNewLocation中)

因此，与其在onCreate()中锁定它并在UpdateWithNewLocation()中发布它，不如在UpdateWithNewLocation()的开头获取它，并在它的末尾发布它。