Android性能优化

1、电池优化

　　作为app开发者，或许很少有人会注意app对电量的损耗，但是用户对电量可是很敏感的，app做好电量损耗的优化会为自己的app加分不少。

如果是一个好的负责任的开发者，就应该限制app对电量的影响，当没有网络连接的时候，禁用后台服务更新，当电池电量低的时候减少更新的频率，确保自己的app对电池的影响降到最低。当电池充电或者电量比较饱和时，可以最大限度的发挥app的刷新率

<receiver android:name=".PowerConnectReceiver">
  <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 chargeFlag = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        boolean usbCharge = chargeFlag == BATTERY_PLUGGED_USB;
        boolean acCharge = chargeFlag == BATTERY_PLUGGED_AC;
    }
}

//获取程序是否充电

int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS,-1);

boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||status == BatteryManager.BATTERY_STATUS_FULL;

// 充电方式，usb还是电源
int chargeFlag = battery.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargeFlag == BATTERY_PLUGGED_USB;
boolean acCharge = chargeFlag == BATTERY_PLUGGED_AC;

不断的检测电量也会影响电池的使用时间，我们可以这样做

<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>

当电量低或者满时会触发

{}