读取NVRAM中的SN（barcode）

在Custom_NvRam_LID.h中，找到需要读取的ID对应的值

实现NvRAMAgent

import java.lang.String;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Binder;
import android.os.Parcel;

public interface NvRAMAgent extends android.os.IInterface
{
    /** Local-side IPC implementation stub class. */
    public static abstract class Stub extends android.os.Binder implements NvRAMAgent
    {
        private static final java.lang.String DESCRIPTOR = "NvRAMAgent";
        /** Construct the stub at attach it to the interface. */
        public Stub()
        {
            this.attachInterface(this, DESCRIPTOR);
        }
        /**
         * Cast an IBinder object into an NvRAMAgent interface,
         * generating a proxy if needed.
         */
        public static NvRAMAgent asInterface(android.os.IBinder obj)
        {
            if ((obj==null)) {
                return null;
            }
            android.os.IInterface iin = (android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
            if (((iin!=null)&&(iin instanceof NvRAMAgent))) {
                return ((NvRAMAgent)iin);
            }
            return new NvRAMAgent.Stub.Proxy(obj);
        }
        public android.os.IBinder asBinder()
        {
            return this;
        }
        public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
        {
            switch (code)
            {
                case INTERFACE_TRANSACTION:
                {
                    reply.writeString(DESCRIPTOR);
                    return true;
                }
                case TRANSACTION_READFILE:
                {
                    data.enforceInterface(DESCRIPTOR);
                    int _arg0;
                    _arg0 = data.readInt();
                    byte[] _result = this.readFile(_arg0);
                    reply.writeNoException();
                    reply.writeByteArray(_result);
                    return true;
                }
                case TRANSACTION_WRITEFILE:
                {
                    data.enforceInterface(DESCRIPTOR);
                    int _arg0;
                    _arg0 = data.readInt();
                    byte[] _arg1;
                    _arg1 = data.createByteArray();
                    int _result = this.writeFile(_arg0, _arg1);
                    reply.writeNoException();
                    reply.writeInt(_result);
                    return true;
                }
                default:
                {
                    break;
                }
            }
            return super.onTransact(code, data, reply, flags);
        }
        private static class Proxy implements NvRAMAgent
        {
            private android.os.IBinder mRemote;
            Proxy(android.os.IBinder remote)
            {
                mRemote = remote;
            }
            public android.os.IBinder asBinder()
            {
                return mRemote;
            }
            public java.lang.String getInterfaceDescriptor()
            {
                return DESCRIPTOR;
            }
            public byte[] readFile(int file_lid) throws android.os.RemoteException
            {
                android.os.Parcel _data = android.os.Parcel.obtain();
                android.os.Parcel _reply = android.os.Parcel.obtain();
                byte[] _result;
                try {
                    _data.writeInterfaceToken(DESCRIPTOR);
                    _data.writeInt(file_lid);
                    mRemote.transact(Stub.TRANSACTION_READFILE, _data, _reply, 0);
                    _reply.readException();
                    _result = _reply.createByteArray();
                }
                finally {
                    _reply.recycle();
                    _data.recycle();
                }
                return _result;
            }
            public int writeFile(int file_lid, byte[] buff) throws android.os.RemoteException
            {
                android.os.Parcel _data = android.os.Parcel.obtain();
                android.os.Parcel _reply = android.os.Parcel.obtain();
                int _result;
                try {
                    _data.writeInterfaceToken(DESCRIPTOR);
                    _data.writeInt(file_lid);
                    _data.writeByteArray(buff);
                    mRemote.transact(Stub.TRANSACTION_WRITEFILE, _data, _reply, 0);
                    _reply.readException();
                    _result = _reply.readInt();
                }
                finally {
                    _reply.recycle();
                    _data.recycle();
                }
                return _result;
            }
        }
        static final int TRANSACTION_READFILE = (IBinder.FIRST_CALL_TRANSACTION + 0);
        static final int TRANSACTION_WRITEFILE = (IBinder.FIRST_CALL_TRANSACTION + 1);
    }
    public byte[] readFile(int file_lid) throws android.os.RemoteException;
    public int writeFile(int file_lid, byte[] buff) throws android.os.RemoteException;
}

下面是读取NVRAM中的SN的例子（sn和imei在一起，mt6582里的ID是AP_CFG_REEB_PRODUCT_INFO_LID）

IBinder binder = ServiceManager.getService("NvRAMAgent");    

NvRAMAgent agent = NvRAMAgent.Stub.asInterface(binder);   

 byte[] buff = null;

   try {    

     buff = agent.readFile(36);// AP_CFG_REEB_PRODUCT_INFO_LID    

} catch (Exception ee) {     ee.printStackTrace();    }