Question

我正在开发一个原生的Android应用程序，每30分钟运行一次操作。我需要确保处理器正在运行，所以我使用了

警报接收器内的PowerManager.Wakelock。

这是我在警报接收器里面使用的代码。

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent arg1) {

        PowerManager pm = (PowerManager) context.getSystemService(context.POWER_SERVICE);
        PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Tag");
        wl.acquire();
        Intent eventService = new Intent(context, SyncInBackground.class);
        context.startService(eventService);
        wl.release();
    }
}

和我的主AndroidManifest.xml

我添加了以下行来请求权限

<uses-permission android:name="android.permission.wake_lock"/>

当我在我的应用程序中运行警报时，我得到以下异常

02-07 23:25:02.839  13699-13699/com.snappext E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start receiver com.snappext.Backup.AlarmReceiver: java.lang.SecurityException: Neither user 10008 nor current process has android.permission.WAKE_LOCK.
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2140)
            at android.app.ActivityThread.access$1500(ActivityThread.java:127)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1211)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4512)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.SecurityException: Neither user 10008 nor current process has android.permission.WAKE_LOCK.
            at android.os.Parcel.readException(Parcel.java:1327)
            at android.os.Parcel.readException(Parcel.java:1281)
            at android.os.IPowerManager$Stub$Proxy.acquireWakeLock(IPowerManager.java:381)
            at android.os.PowerManager$WakeLock.acquireLocked(PowerManager.java:297)
            at android.os.PowerManager$WakeLock.acquire(PowerManager.java:276)
            at com.snappext.Backup.AlarmReceiver.onReceive(AlarmReceiver.java:54)
            at android.app.ActivityThread.handleReceiver(ActivityThread.java:2133)
            at android.app.ActivityThread.access$1500(ActivityThread.java:127)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1211)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4512)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
            at dalvik.system.NativeStart.main(Native Method)

任何线索？

Answer 1

Android权限区分大小写。请改用：

<uses-permission android:name="android.permission.WAKE_LOCK"/>

Answer 2

尝试将权限更改为

<uses-permission android:name="android.permission.WAKE_LOCK" />

我认为大写字母在这里有所不同，但我可能错了。

参考：https://developer.android.com/training/scheduling/wakelock.html

当我使用PowerManager.WakeLock与AlaramManager android时的权限异常

2 个答案: