app耗电优化之一 根据电池情况做任务安排

这里要讲根据电池的当前特征对任务排期。对一个比较耗电的任务,需要在电量比较丰盈的情况下完成,如果电量已经枯萎了,做这样的任务,则会耗尽所有电量。
基于此,在做这样的任务前,获取当前电池特征,并利用电池特征做出是否要执行任务的判断。
详细讲解如下:
1 获取当前的电池特征

/* 获取当前电池状态。将BroadcastReceiver 设为null 则会直接返回当前电池的状态。*/
        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = registerReceiver(null, ifilter);
        /**
         *  电池充电状态
         *  public static final int BATTERY_STATUS_UNKNOWN = 1;  未知状态
         *  public static final int BATTERY_STATUS_CHARGING = 2; 充电中
         *  public static final int BATTERY_STATUS_DISCHARGING = 3; 放电中
         *  public static final int BATTERY_STATUS_NOT_CHARGING = 4; 未纯电
         *  public static final int BATTERY_STATUS_FULL = 5; 电满状态
         */
        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        /**
         * 电池充电方式, 如果手机正在充电情况下,则可以做一些耗电的操作,其中AC充电时可以最大限度的使用。其次USB充电
         *  public static final int BATTERY_PLUGGED_USB = 2; USB充电
         *  public static final int BATTERY_PLUGGED_WIRELESS = 4; 无线充电
         *  public static final int BATTERY_PLUGGED_AC = 1; AC充电,交流电充电
         */
        int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        /**
         * 电池电量水平
         */
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        float batteryPct = level / (float)scale;
        /**
         *  public static final int BATTERY_HEALTH_UNKNOWN = 1;    健康状态未知
         *  public static final int BATTERY_HEALTH_GOOD = 2;    健康
         *  public static final int BATTERY_HEALTH_OVERHEAT = 3;  过热
         *  public static final int BATTERY_HEALTH_DEAD = 4;    没电
         *  public static final int BATTERY_HEALTH_OVER_VOLTAGE = 5;  过电压
         *  public static final int BATTERY_HEALTH_UNSPECIFIED_FAILURE = 6; 未定义错误
         *  public static final int BATTERY_HEALTH_COLD = 7; 冷却
         */
        int health = batteryStatus.getIntExtra(BatteryManager.EXTRA_HEALTH, -1);

至于应该在那个时机执行任务,我想读者能够分辨的出,只要别再BATTERY_HEALTH_DEAD 的时候安排任务即可。

2 监听电池充电状态。电池充电往往是干活的好时机,那时候随便你干,电量都能满足
 注册监听

<receiver android:name=".BattertyConnectReceiver">
        <intent-filter>
            <!-- 手机链接充电或断开充电引起变化 -->
            <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
             <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
        </intent-filter>
    </receiver>

 接收广播

public class BattertyConnectReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
            if(status == BatteryManager.BATTERY_STATUS_CHARGING){
            //充电状态,好时机
            }else if(status == BatteryManager.BATTERY_STATUS_NOT_CHARGING){
            //断开充电状态
            }
        }
}

3 监听电池低电变化状态
 注册监听

<receiver android:name=".BatteryLevelReceiver">
        <intent-filter>
            <!-- 电量进入不足时或者电量从不足进入足时引起变化 -->
            <action android:name="android.intent.action.ACTION_BATTERY_LOW"/>
            <action android:name="android.intent.action.ACTION_BATTERY_OKAY"/>
        </intent-filter>
    </receiver>

接收广播

public class BatteryLevelReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if(ACTION_BATTERY_LOW.equals(action)){
                //电量走向不足档位,做任务状态保存
            }else if(ACTION_BATTERY_OKAY.equals(action)){
                //电量走向充足档位
            }
        }
}

以上API是正对电池特征的一些基本的判断。需要在恰当的电池状态做恰当任务

 

其他耗电优化方法请看 app耗电优化

posted @ 2017-07-22 08:18  欧颜柳  阅读(1055)  评论(0编辑  收藏  举报