codenameone中用于获取电池信息的本机接口

我遵循了Shai的本机接口教程，但我一直坚持在codenameone中暗示android本机代码。我需要在设备关闭后立即获取电池电量（百分比）。我已经在原生安卓系统中完成了这项工作，并且我已经在cn1中构建了应用程序，它也需要这个功能。下面我提供了代码。请帮我把它用在cn1上。谢谢

本机android代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //for mobile shutdown starts
    IntentFilter filter = new IntentFilter(Intent.ACTION_SHUTDOWN);
    BroadcastReceiver mReceiver = new ShutDownReceiver();
    registerReceiver(mReceiver, filter);
    //for mobile shutdown ends
}

//for mobile shutdown
public class ShutDownReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent)
    {
        if (intent.getAction().equals(Intent.ACTION_SHUTDOWN))
        {
            Log.e("shutdown","mobile shutdown");
            Log.e("shutdown battery percentage",getBatteryPCT() + "");
        }
    }
}

public float getBatteryPCT()
{
    IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
    Intent batteryStatus = this.registerReceiver(null, ifilter);
    int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
    //Check if charging.
    boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;
    //Check if charger plugged in.
    int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
    //check if charging via USB.
    boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
    //check if charging via AC.
    boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
    int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
    int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
    float batteryPct = level / (float)scale;
    //Get the current battery percentage.
    return batteryPct*100;
}

下面是我在cn1中尝试的内容，但构建失败

public class MyNativeImpl {

    public boolean isSupported() {
        return true;
    }

    public void getShutDownBattery() {
        IntentFilter filter = new IntentFilter(Intent.ACTION_SHUTDOWN);
        BroadcastReceiver mReceiver = new ShutDownReceiver();
        registerReceiver(mReceiver, filter);

        getBatteryPCT();
        Log.e("battery status", getBatteryPCT() + "");
    }

    public class ShutDownReceiver extends BroadcastReceiver {

        public void onReceive(Context context, Intent intent) {
            if (intent.getAction().equals(Intent.ACTION_SHUTDOWN)) {
                Log.e("shutdown", "mobile shutdown");

                Log.e("shutdown battery percentage", getBatteryPCT() + "");
            }
        }
    }

    public float getBatteryPCT() {
        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = this.registerReceiver(null, ifilter);
        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;
        int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
        boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        float batteryPct = level / (float) scale;
        return batteryPct * 100;
    }
}

MyNative接口

public interface MyNative extends NativeInterface{
    public void getShutDownBattery();
}

更新1:

---

你好，Shai，关于你的回答，我有几个问题：

1） 将ShutdownReceiver类移动到顶级类而不是内部类

为什么内部阶级在这里不起作用

2） 需要从registerReceiver的AndroidNativeUtil获取活动

我在你提供的链接中没有找到任何关于AndroidNativeUtil的内容。下面这行正确吗

导入com.codename1.impl.android.AndroidNativeUtil.registerReceiver（mrReceiver，过滤器）

3） 权限

我在这里需要什么权限？在本机android代码中，它不需要任何权限

更新代码：

public class MyNativeImpl{

    public boolean isSupported() {
        return true;
    }

    public void getShutDownBattery() {
        IntentFilter filter = new IntentFilter(Intent.ACTION_SHUTDOWN);
        BroadcastReceiver mReceiver = new ShutDownReceiver();
        AndroidNativeUtil.registerReceiver(mReceiver, filter);
    }
}

class ShutDownReceiver extends BroadcastReceiver {

    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SHUTDOWN)) {
            Log.e("shutdown", "mobile shutdown");

            Log.e("shutdown battery percentage", getBatteryPCT() + "");
        }
    }

    public float getBatteryPCT() {
        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        Intent batteryStatus = this.registerReceiver(null, ifilter);
        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
        //Check if charging.
        boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;
        //Check if charger plugged in.
        int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
        //check if charging via USB.
        boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
        //check if charging via AC.
        boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
        int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
        int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
        float batteryPct = level / (float) scale;
        //Get the current battery percentage.
        return batteryPct * 100;
    }
}

---

将

ShutdownReceiver

类移动到顶级类，而不是内部类

registerReceiver

是一种活动方法，因此您需要像我一样从

AndroidNativeUtil

获取活动

本机代码中缺少两件您需要做的事情，那就是权限。您需要向清单添加权限，您可以通过构建提示

android.xpermissions

hint来完成

---

您还需要在代码中请求Android 6+权限，您可以通过

AndroidNativeUtil

调用

checkForPermission

，如前所述。

你好，Shai，我有几个问题Shai。请看一下问题中的更新。我建议提出一个新问题，因为这很难理解。1.Android可能会尝试动态加载一个类，所以这总是一个更好的做法。2. <代码>AndroidNativeUtil.getActivity（）.registerReceiver（MRReceiver，筛选器）3。提到

DEVICE\u POWER

我得到了构建错误。我在原生安卓系统中试用过，效果很好。我已经重复了这个问题