PowerManager.newWakeLock()抛出IlleagelArgumentException

Question

我正在尝试获取一个唤醒锁，但是当我调用PowerManager.newWakeLock()时，我收到了一个IlleglArgumentException。

下面是我用来获取

private void setWakeLock(Context context)
{
    PowerManager pm = (PowerManager) context
    .getSystemService(Context.POWER_SERVICE);
    SoundAlarmActivity.WakeLock = pm.newWakeLock(
    PowerManager.ACQUIRE_CAUSES_WAKEUP
            | PowerManager.ON_AFTER_RELEASE, "Alarm");
    SoundAlarmActivity.WakeLock.acquire();
}

下面是logcat：

09-28 12:53:09.704: ERROR/AndroidRuntime(702): java.lang.IllegalArgumentException
09-28 12:53:09.704: ERROR/AndroidRuntime(702):     at android.os.PowerManager$WakeLock.<init>(PowerManager.java:223)
09-28 12:53:09.704: ERROR/AndroidRuntime(702):     at android.os.PowerManager.newWakeLock(PowerManager.java:365)

Answer 1

试试这个：

private void setWakeLock(Context context)
{
    PowerManager pm = (PowerManager) context
    .getSystemService(Context.POWER_SERVICE);
    SoundAlarmActivity.WakeLock = pm.newWakeLock(
    PowerManager.FULL_WAKE_LOCK |
        PowerManager.ACQUIRE_CAUSES_WAKEUP
            | PowerManager.ON_AFTER_RELEASE, "BusSnoozeAlarm");
    SoundAlarmActivity.WakeLock.acquire();
}

PowerManager.ACQUIRE_CAUSES_WAKEUP不能处理部分唤醒锁，所以在定义你想要的唤醒锁类型时，你必须确保你使用的是FULL_WAKE_LOCK。

Answer 2

你应该定义你想要的“种类”的唤醒锁。您给出的两个标志只是对级别的补充：

[WakeLock level] Flag Value | CPU | Screen | Keyboard
-----------------------------------------------------
PARTIAL_WAKE_LOCK           | On* | Off    | Off
SCREEN_DIM_WAKE_LOCK        | On  | Dim    | Off
SCREEN_BRIGHT_WAKE_LOCK     | On  | Bright | Off
FULL_WAKE_LOCK              | On  | Bright | Bright

注意:从API级别17开始，除PARTIAL_WAKE_LOCK以外的其他唤醒级别都被弃用，您应该改用LayoutParams.FLAG_KEEP_SCREEN_ON。