Android提供的系统服务之--PowerManager(电源服务)

Android提供的系统服务之--PowerManager(电源服务)

——转载请注明出处:coder-pig

本节引言:

本节主要讲解的Android为我们提供的系统服务中的:PowerManager电源管理的一个API,

用于管理CPU运行,键盘或者屏幕亮起来;不过,除非是迫不得已吧,不然的话,否则应该尽量避免

使用这个类,并且使用完以后一定要及时释放!本节并不太深入的去讲解,因为这个设计到底层的

一些东西,以后需要用到再深入研究,到时再另外写一篇blog总结!所以本节介绍的主要是

一些基本的概念,PowerManager,wakelock锁的机制等等!

本节知识点图:

代码示例:

一个管理WakeLock以及Android设备电源管理的工具类:

import android.content.Context;import android.content.SharedPreferences;import android.os.PowerManager;import android.preference.PreferenceManager;public class ManageWakeLock {    private static PowerManager.WakeLock mWakeLock = null;    private static PowerManager.WakeLock mPartialWakeLock = null;    private static final boolean PREFS_SCREENON_DEFAULT = true;    private static final boolean PREFS_DIMSCREEN_DEFAULT = false;    private static final String PREFS_TIMEOUT_DEFAULT = "30";    public static synchronized void acquireFull(Context mContext) {        if (mWakeLock != null) {             return;        }        PowerManager mPm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);        SharedPreferences mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);        int flags;        flags = PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP;        mWakeLock = mPm.newWakeLock(flags, “ManagerWakeLock”);        mWakeLock.setReferenceCounted(false);        mWakeLock.acquire();    }    public static synchronized void acquirePartical(Context mContext) {        //Check if partial lock already exists        if (mPartialWakeLock != null) {            return;        }        PowerManager mPm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);        mPartialWakeLock = mPm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK                                | PowerManager.ACQUIRE_CAUSES_WAKEUP, “ManagerWakeLock”);        mPartialWakeLock.setReferenceCounted(false);            mPartialWakeLock.acquire();        }    }    public static synchronized void releaseFull() {        if (mWakeLock != null) {            mWakeLock.release();            mWakeLock = null;        }    }    public static synchronized void releasePartial() {        if (mPartialWakeLock != null) {             mPartialWakeLock.release();             mPartialWakeLock = null;        }    }    public static synchronized void releaseAll() {        releaseFull();        releasePartial();    }}

参考资料:

http://www.open-open.com/lib/view/open1343207436974.html

http://blog.csdn.net/xieqibao/article/details/6562256

http://blog.chinaunix.net/uid-27411029-id-4040727.html

1楼fczn11前天 11:25: 有段时间没来了，顶