监控电池电量和充电状态

 

 

确定当前的充电状态

IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent battery = context.registerReceiver(null, ifilter);

// 是否正在充电
int status = battery.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                     status == BatteryManager.BATTERY_STATUS_FULL;

// USB还是交流充电器？
int chargePlug = battery.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BATTERY_PLUGGED_AC;

 

确定当前的电池电量

int level = battery.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = battery.getIntExtra(BatteryManager.EXTRA_SCALE, -1); float batteryPct = level / (float)scale;

 

监控充电状态的变化

1.在Manifest中注册

<receiver android:name=".PowerConnectionReceiver">
  <intent-filter>
    <action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
    <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
  </intent-filter>
</receiver>

 

public class PowerConnectionReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) { 
        int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
                            status == BatteryManager.BATTERY_STATUS_FULL;
    
        int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        boolean usbCharge = chargePlug == BATTERY_PLUGGED_USB;
        boolean acCharge = chargePlug == BATTERY_PLUGGED_AC;
    }
}

 

监控电池电量的显著变化

监控设备进入或结束低电量状态的情况下

以下清单代码段提取自广播接收器中的 intent 过滤器元素。通过侦听 ACTION_BATTERY_LOW 和ACTION_BATTERY_OKAY，只要设备的电池进入或结束低电量状态，系统就会触发接收器。

<receiver android:name=".BatteryLevelReceiver">
<intent-filter>
  <action android:name="android.intent.action.ACTION_BATTERY_LOW"/>
  <action android:name="android.intent.action.ACTION_BATTERY_OKAY"/>
  </intent-filter>
</receiver>