我有一个问题。我试图做一个广播接收器获得一个唤醒锁，所以我的闹钟将唤醒手机从休眠模式。

在下面的广播接收器，程序崩溃与源未找到上线sCpuWakeLock.acquire（）;上课的时候​​AlarmAlertWakeLock被称为AlarmReceiver。 任何想法是怎么回事？有没有更好的办法做我想要做什么？

在一个文件中：

 进口android.content.BroadcastReceiver;
进口android.content.Context;
进口android.content.Intent;

公共类AlarmReceiver扩展的BroadcastReceiver {
    @覆盖
    公共无效的onReceive（最终上下文的背景下，意图意图）{
        AlarmAlertWakeLock.acquireCpuWakeLock（上下文）;

    }
}
 

在一个单独的文件：

 进口android.content.Context;
进口android.os.PowerManager;

公共类AlarmAlertWakeLock {

    私有静态PowerManager.WakeLock sCpuWakeLock;

    静态无效acquireCpuWakeLock（上下文的背景下）{

        如果（sCpuWakeLock！= NULL）{
            返回;
        }
        电源管理器PM =（电源管理器）context.getSystemService（Context.POWER_SERVICE）;


        sCpuWakeLock = pm.newWakeLock（
                PowerManager.PARTIAL_WAKE_LOCK |
                PowerManager.ACQUIRE_CAUSES_WAKEUP，okTag）;
        sCpuWakeLock.acquire（）;
    }

    静态无效releaseCpuLock（）{
        如果（sCpuWakeLock！= NULL）{
            sCpuWakeLock.release（）;
            sCpuWakeLock = NULL;
        }
    }
}
 

解决方案

没关系，我理解了它 - 我需要唤醒锁权限添加到清单：

使用-权限的Andr​​oid：名称=android.permission.WAKE_LOCK

现在正常工作！

I have a problem. I am trying to make a broadcast receiver acquire a wake lock so my alarm will wake the phone from sleep mode.

In the broadcast receiver below, the program crashes with "source not found" on line "sCpuWakeLock.acquire(); when the class "AlarmAlertWakeLock" is called by AlarmReceiver. Any idea what's going on? Is there a better way to do what I'm trying to do?

In one file:

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {
        AlarmAlertWakeLock.acquireCpuWakeLock(context);

    }    
}

In a separate file:

import android.content.Context;
import android.os.PowerManager;

public class AlarmAlertWakeLock {

    private static PowerManager.WakeLock sCpuWakeLock;

    static void acquireCpuWakeLock(Context context) {

        if (sCpuWakeLock != null) {
            return;
        }
        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);


        sCpuWakeLock = pm.newWakeLock(
                PowerManager.PARTIAL_WAKE_LOCK |
                PowerManager.ACQUIRE_CAUSES_WAKEUP,"okTag");
        sCpuWakeLock.acquire();
    }

    static void releaseCpuLock() {
        if (sCpuWakeLock != null) {
            sCpuWakeLock.release();
            sCpuWakeLock = null;
        }
    }
}

Never mind, I figured it out - I needed to add wake lock permission to the manifest:

uses-permission android:name="android.permission.WAKE_LOCK"

Works fine now!