如何在android中了解设备电源的开启或关闭？

Question

我正在开发一个应用程序，我希望在设备电源打开时启动服务，并在设备电源关闭时停止服务。有人能告诉我如何确定设备状态（打开或关闭）吗？

Answer 1

根据android documentation，您可以像这样定义BroadcastRecevier

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 == BatteryManager.BATTERY_PLUGGED_USB;
        boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
        //Start/stop your service here
        if(isCharging) {
            context.startService(...);
        } else {
            context.stopService(...);
        }
    }
}

并在AndroidManifest.xml

中声明

<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>