Android 添加系统串口服务步骤

系统服务实际上是调用了远程Bind对象进行操作

1：添加aidl文件到 framworks/base/core/java/android/hardware/ISerialManager.aidl//这个文件是需要自己现实的

2：编译脚本中添加申明

  frameworks/base/Android.mk:     core/java/android/hardware/ISerialManager.aidl \

3：Context文件中添加变量

frameworks/base/core/java/android/content/Context.java:    public static final String SERIAL_SERVICE = "serial";

4:添加调用远程服务的文件

              frameworks/base/services/java/com/android/server/ SerialService.java//这个文件是需要自己现实的 

          到frameworks/base/services/java/com/android/server/SystemServer.java:

 例如：public class SerialService extends ISerialManager.Stub文件

  try {
                Slog.i(TAG, "Serial Service");
                // Serial port support
                serial = new SerialService(context);
                ServiceManager.addService(Context.SERIAL_SERVICE, serial);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting SerialService", e);
            }

 }

5:添加注册服务到 frameworks/base/core/java/android/app/ContextImpl.java:  获取SerialManager

import android.hardware.SerialManager;

import android.hardware.ISerialManager;//这两个文件是需要自己现实的 

 构造方法中传入两个参数 public SerialManager(Context context, ISerialManager service) {
        mContext = context;
        mService = service;
    }

        registerService(SERIAL_SERVICE, new ServiceFetcher() {
                public Object createService(ContextImpl ctx) {
                    IBinder b = ServiceManager.getService(SERIAL_SERVICE);
                    return new SerialManager(ctx, ISerialManager.Stub.asInterface(b));
                }});

接下来就可以通过(SerialManager)getSystemService(Context.SERIAL_SERVICE);来获取SerialManager