android - 检查设备是否已插入

Question

我的应用有一个广播接收器来监听 ACTION_POWER_CONNECTED 的变化，然后标记屏幕以保持打开状态。

我缺少的是应用程序在首次运行时检查充电状态的能力。任何人都可以帮我编写代码以手动检查充电状态吗？

Answer 1

感谢 CommonsWare，这是我编写的代码。

public class Power {
    public static boolean isConnected(Context context) {
        Intent intent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
        int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS;
    }
}

if (Power.isConnected(context)) {
    ...
}

或 Kotlin 版本

object Power {
    fun isConnected(context: Context): Boolean {
        val intent = context.registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
        val plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1)
        return plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB || plugged == BatteryManager.BATTERY_PLUGGED_WIRELESS
    }
}

http://developer.android.com/training/monitoring-device-state/battery-monitoring.html