在为android手机充电时检测当前的电流

Question

我想开发一个小的应用程序，显示当前正在由手机在充电期间的电流。这款手机是通过A/C插上的，正在拔1A。

根据我的研究，现有的API如下：

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

然而，这些只会告诉你，它是通过USB或A/C充电，它的现状。

我想做一些测试，看看不同电缆和A/C适配器的收费率。

Answer 1

您可以使用以下方法检查电池的电平

    private static int checkBatteryLevel(Context context) {
        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = context.registerReceiver(null, ifilter);

        // Are we charging / charged?
        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;

        // If the device is charging then set the state as charging and return.
        if (isCharging)
            return 100;

        // Get the battery level.
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

        // To get the battery level in %
        int batteryLevel = (level * 100) / scale;
        Log.e(Constants.TAG, "Battery Level: " + batteryLevel);

        return batteryLevel;
    }

您可以使用以下接收器检测连接和断开连接

public class BatteryInformationReceiver extends BroadcastReceiver {

    private static final String ACTION_POWER_CONNECTED = "android.intent.action.ACTION_POWER_CONNECTED";
    private static final String ACTION_POWER_DISCONNECTED = "android.intent.action.ACTION_POWER_DISCONNECTED";

    @Override
    public void onReceive(Context context, Intent intent) {

        String intentAction = intent.getAction();
        if (intentAction.equalsIgnoreCase(ACTION_POWER_CONNECTED)) {

        } else if (intentAction.equalsIgnoreCase(ACTION_POWER_DISCONNECTED)) {

        } 

    }
}

并在清单中

<receiver android:name="your.package.receivers.BatteryInformationReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
                <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
            </intent-filter>
        </receiver>

，然后，在连接时，使用上述方法计算电池电平。断开连接后，计算出电池的电平。并从电池的时间和价值之间的差异。你可以计算你想要的任何东西。

希望这能有所帮助