extend svc command to control NFC state

/*

 * Copyright (C) 2015 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.android.commands.svc;

import android.content.Context;

import android.content.pm.IPackageManager;

import android.content.pm.PackageManager;

import android.nfc.INfcAdapter;

import android.os.RemoteException;

import android.os.ServiceManager;

public class NfcCommand extends Svc.Command {

    public NfcCommand() {

        super("nfc");

    }

    @Override

    public String shortHelp() {

        return "Control NFC functions";

    }

    @Override

    public String longHelp() {

        return shortHelp() + "\n"

                + "\n"

                + "usage: svc nfc [enable|disable]\n"

                + "         Turn NFC on or off.\n\n";

    }

    @Override

    public void run(String[] args) {

        boolean validCommand = false;

        if (args.length >= 2) {

            boolean flag = false;

            if ("enable".equals(args[1])) {

                flag = true;

                validCommand = true;

            } else if ("disable".equals(args[1])) {

                flag = false;

                validCommand = true;

            }

            if (validCommand) {

                IPackageManager pm = IPackageManager.Stub.asInterface(

                        ServiceManager.getService("package"));

                try {

                    if (pm.hasSystemFeature(PackageManager.FEATURE_NFC)) {

                        INfcAdapter nfc = INfcAdapter.Stub

                                .asInterface(ServiceManager.getService(Context.NFC_SERVICE));

                        try {

                            if (flag) {

                                nfc.enable();

                            } else

                                nfc.disable(true);

                        } catch (RemoteException e) {

                            System.err.println("NFC operation failed: " + e);

                        }

                    } else {

                        System.err.println("NFC feature not supported.");

                    }

                } catch (RemoteException e) {

                    System.err.println("RemoteException while calling PackageManager, is the "

                            + "system running?");

                }

                return;

            }

        }

        System.err.println(longHelp());

    }

}

            new PowerCommand(),

            new DataCommand(),

            new WifiCommand(),

            new UsbCommand()

            new UsbCommand(),

            new NfcCommand(),

    };

}