public class PowerManagerActivity extends ActionBarActivity {private PowerManager powerManager;private PowerManager.WakeLock wakeLock;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_power_manager);powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE);}private void acquireWakeLock(){wakeLock = powerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,"wakelock");if(wakeLock!=null)wakeLock.acquire();}private void releaseWakeLock(){if(wakeLock!=null)wakeLock.release();}@Overrideprotected void onResume() {super.onResume();acquireWakeLock();}@Overrideprotected void onPause() {super.onPause();releaseWakeLock();}
}

　　使用该方法需要用到如下权限：

　　代码比较简单，在获取WakeLock的时候我们使用了PowerManager.SCREEN_BRIGHT_WAKE_LOCK，该flag表明cpu保持运行，屏幕保持常亮。同时注意WakeLock的acquire方法和release方法要成对使用，在这里利用了Activity的生命周期方法。

　　还要注意的是WakeLock是Activity级别的不是针对整个Application的。

　　要想获取电池信息比如状态、健康信息、电池容量等，我们可以通过注册一个广播接收者用来接收Intent.ACTION_BATTERY_CHANGED广播即可，当电池发送变化的时候，系统就会发出该广播。Android提供了BatteryManager类，该类主要提供了一些常量，用于从广播的Intent中提取相关的数据，常量列表如下：

定义一个广播接收者，用于检测电池状态的变化，关键代码如下：

private class BattaryReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {if(intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)){//电池状态int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS,0);String statusString = "";switch (status){case BatteryManager.BATTERY_STATUS_FULL:statusString="full";break;case BatteryManager.BATTERY_STATUS_CHARGING:statusString="charging";break;case BatteryManager.BATTERY_STATUS_DISCHARGING:statusString="discharging";break;case BatteryManager.BATTERY_STATUS_UNKNOWN:statusString="unknown";break;case BatteryManager.BATTERY_STATUS_NOT_CHARGING:statusString="not charging";break;}//
        boolean present= intent.getBooleanExtra(BatteryManager.EXTRA_PRESENT,false);//integer field containing the current battery level,int curlevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL,0);// integer containing the maximum battery levelint maxLevel = intent.getIntExtra(BatteryManager.EXTRA_SCALE,0);//String describing the technology of the current batteryString technology = intent.getStringExtra(BatteryManager.EXTRA_TECHNOLOGY);//integer containing the current health constantint health = intent.getIntExtra(BatteryManager.EXTRA_HEALTH,0);String healthStr = "";switch (health){case BatteryManager.BATTERY_HEALTH_COLD:healthStr="cold";break;case BatteryManager.BATTERY_HEALTH_DEAD:healthStr="dead";break;case BatteryManager.BATTERY_HEALTH_GOOD:healthStr="good";break;case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:healthStr="voer voltage";break;case BatteryManager.BATTERY_HEALTH_UNKNOWN:healthStr="unknown";break;case BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE:healthStr="unspecified failure";break;}//integer containing the resource ID of a small status bar icon indicating the current battery stateint smallIcon = intent.getIntExtra(BatteryManager.EXTRA_ICON_SMALL,0);//integer indicating whether the device is plugged in to a power source; 0 means it is on battery,// other constants are different types of power sourcesint plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED,0);String pluggedStr="";switch (plugged){case BatteryManager.BATTERY_PLUGGED_AC:pluggedStr="AC";break;case BatteryManager.BATTERY_PLUGGED_USB:pluggedStr="USB";break;case BatteryManager.BATTERY_PLUGGED_WIRELESS:pluggedStr="wireless";break;}// integer containing the current battery temperature.int temperature= intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE,0);// integer containing the current battery voltage level.int voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE,0);StringBuilder sb = new StringBuilder("status:");sb.append(statusString);sb.append("\n");sb.append("present:").append(present);sb.append("\n");sb.append("level:").append(curlevel);sb.append("\n");sb.append("maxLevel:").append(maxLevel);sb.append("\n");sb.append("technology:").append(technology);sb.append("\n");sb.append("health:").append(healthStr);sb.append("\n");sb.append("icon:").append(smallIcon);sb.append("\n");sb.append("plugged:").append(pluggedStr);sb.append("\n");sb.append("temperature:").append(temperature);sb.append("\n");sb.append("voltage:").append(voltage);sb.append("\n");Message msg= mHandler.obtainMessage(1);msg.obj = sb.toString();mHandler.sendMessage(msg);}
}
}

主要接收该广播需要用到权限：

作者：杰瑞教育
出处：http://www.cnblogs.com/jerehedu/ 
版权声明：本文版权归烟台杰瑞教育科技有限公司和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
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