激活锁定＆QUOT; DoNotSleep＆QUOT;继续崩溃.. [英] Wakelock "DoNotSleep" Continue to crash..

问题描述

从我的最后一个问题：<一href=\"http://stackoverflow.com/questions/23665791/my-app-crashes-just-because-wakelock-donotsleep\">My应用程序崩溃，只是因为激活锁定＆QUOT; DoNotSleep＆QUOT;

From my last question : My app crashes just because wakelock "DoNotSleep"

我添加了一行：wakeLock.acquire（）;

I added the line : wakeLock.acquire();

但我的问题继续...

But my problem continue... :

这就是我的logcat的：

Thats my logcat :

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code：

And in my code:

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(); 
}

请注意：我改变了wakeLock.release（）;并提出，在功能UpdateWithNewLocation（最终位置LOC）的启动，因为否则它不停止。

Note: I changed the wakeLock.release(); And put that at the start of the function UpdateWithNewLocation(final Location loc) Because otherwise it doesnt stop.

现在我的问题是，我仍然得到错误信息。

Now my problem is that I still get error message.

推荐答案

如果一个锁被释放更多的时间比被收购，会出现此异常（<一个href=\"http://grep$c$c.com/file/repository.grep$c$c.com/java/ext/com.google.android/android/2.0_r1/android/os/PowerManager.java#PowerManager.WakeLock.release%28%29\"相对=nofollow>来源）：

This exception occurs if a lock is released more times than it was acquired (source):

    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);
            }
        }
    }

您获得锁只有一次（在的onCreate ），但它释放多次（在 UpdateWithNewLocation ）

You acquire the lock only once (in onCreate) but release it multiple times (in UpdateWithNewLocation)

所以，与其在的onCreate锁定它（）和 UpdateWithNewLocation释放它（），你应该收购它 UpdateWithNewLocation（）的开始和结束释放。

So, instead of locking it in onCreate() and releasing it in UpdateWithNewLocation(), you should probably acquire it in the beginning of UpdateWithNewLocation() and release it in its end.

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