Android AIDL的使用与实现（接上一篇HIDL的实现）

AIDL的创建与使用

server+client

一、server，aidl的服务端

先从AndroidManifest.xml开始

<application
        android:name=".ApiApplication"
        android:allowBackup="true"
        android:directBootAware="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:persistent="false"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"&gt;
        
        <service
            android:name=".APIService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
				<action android:name="com.xxxxapi.intent.ACTION_API_SERVICE" />
            </intent-filter>
        </service>
        
</application>

里面具体的参数赋值的意义，可以自行百度

<action android:name="com.xxxxapi.intent.ACTION_API_SERVICE" />这个很重要，在客户端绑定服务端时，需要用到这个intent filter

再创建以下xxxxAPI.aidl文件

package com.emdoor.xxxxapi;

import com.emdoor.xxxxapi.APIListener;

interface xxxxAPI {
  int getDisplayInputPortState(int port);			//服务端的API方法
//sendUartData，接引另一篇文章<<Android C++服务创建和HIDL的生成>>，
//client通过aidl连接server，server再通过这个方法发送data到hal层的TestOfHidl服务
//TestOfHidl服务server实现的onDataReceived方法,通过APIListener中的onUartDataReceived(in byte[] data)返回数据给app
//具体可见稍后的代码
  void sendUartData(in byte[] data);	
  void setAPIListener(in APIListener listener);		//app监听
}

再创建监听文件

// APIListener.aidl
package com.emdoor.xxxxapi;
interface APIListener {
    void onUartDataReceived(in byte[] data);
}

创建服务

public class APIService extends Service {
    private static final String TAG = "APIService";
	private xxxxAPI mxxxxAPI;
	
    @Override
    public void onCreate() {
        super.onCreate();
        Log.e(TAG, "APIService onCreate !!!");
        IBinder binder = getService("xxxxapi");
        if (binder != null) {
            mxxxxAPI = xxxxAPI.Stub.asInterface(binder);
        } else {
            Log.e(TAG, "API service not available");
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.e(TAG, "APIService onBind !!!");
        return ApiImpl.getInstance();
    }

    private IBinder getService(String serviceName) {
        try {
            Class<?> serviceManager = Class.forName("android.os.ServiceManager");
            Method getService = serviceManager.getMethod("getService", String.class);
            return (IBinder) getService.invoke(serviceManager.newInstance(), serviceName);
        } catch (ClassNotFoundException | NoSuchMethodException |
         IllegalArgumentException | IllegalAccessException | 
         InvocationTargetException | InstantiationException e) {
            e.printStackTrace();
        }
        return null;
    }

}

创建实现类，有关ITestOfHidl的作用，可以查看“Android C++服务创建和HIDL的生成”这一章内容

public class ApiImpl extends xxxxAPI.Stub {

    private static final String TAG = "ApiImpl";
    private Context mContext;
    private static ApiImpl instance;
    private APIListener listener;
    private ITestOfHidl mTestOfHidl;

    public static ApiImpl getInstance() {
        if (instance == null) {
            instance = new ApiImpl();
        }
        return instance;
    }

    private ApiImpl() {
        try {
        	//获取HIDL的服务
           	mTestOfHidl = ITestOfHidl.getService();
            if (mTestOfHidl != null) {
            	//实现ITestOfHidl中的回调，即获取ITestOfHidl这个服务中返回的数据
                mTestOfHidl.setDataCallback(new IDataCallback.Stub() {
                    @Override
                    public void onDataReceived(ArrayList<Byte> data) throws RemoteException {
                        Log.d(TAG, "enter onDataReceived");
                        if ( data != null) {
                        	//开始“解析”和获取数据
                            byte[] result = new byte[data.size()];
                            for (int i = 0; i < data.size(); i++) {
                                result[i] = data.get(i);
                            }
                            //listener是跟aidl相关的监听，注意是aidl，不是hidl
                            //hidl的监听在上一章“Android C++服务创建和HIDL的生成”
                            if(listener != null){
                            	//通过aidl的监听发送来自hidl服务返回的数据
                            	//数据的流动：hidl服务端->aidl服务端（hidl客户端）->aidl客户端
                                listener.onUartDataReceived(result);
                            }else {
                                Log.d(TAG, "listener == null");
                            }
                        }else {
                            Log.d(TAG, "data == null");
                        }
                    }
                });

            }
        } catch (RemoteException | NoSuchElementException e) {
            e.printStackTrace();
        }
    }

    public void setContext(Context context) {
        this.mContext = context.getApplicationContext();
    }

    @Override
    public int getDisplayInputPortState(int port) throws RemoteException {
        switch (port) {
            case 1:
                return 1;
            case 2:
                return 2;
            case 3:
                return 3;
            default:
                return -1;
        }
    }
	
	//aidl的实现，这个接口给aidl客户端使用，客户端只需调用sendUartData(byte[] data)接口即可，
	//将指令byte[] data从AIDL客户端->AIDL服务端（HDIL客户端）->HIDL服务端
	//HIDL服务端接收到AIDL客户端发送的指令，经过HIDL服务内部的一些处理，
	//通过ApiImpl()内的HIDL回调onDataReceived，返回一些数据给AIDL的客户端
    @Override
    public void sendUartData(byte[] data) throws RemoteException {
        if (data == null || data.length == 0) {
            Log.e(TAG, "data can not be null or empty");
            return;
        }
        if (mTestOfHidl != null) {
            ArrayList<Byte> list = new ArrayList<Byte>();
            for (byte datum : data) {
                list.add(datum);
            }
            mTestOfHidl.sendData(list);
            Log.e(TAG, "data already send!");
        } else {
            Log.e(TAG, "server is not ready");
        }
    }

    @Override
    public void setAPIListener(APIListener listener) throws RemoteException {
        if(listener == null){
            Log.e(TAG,"input listener NULL");
        }
        this.listener = listener;
    }
}

二. client，AIDL的客户端

1.先将aidl文件复制到客户端app的项目中

	@Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();		
		//连接服务
        Intent intent = new Intent("com.xxxxapi.intent.ACTION_API_SERVICE");
        intent.setPackage("com.emdoor.xxxxapi");
        bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);
    }

	//连接
    private final ServiceConnection mServiceConnection = new ServiceConnection() {
    	//如果连接上，就执行这里面的方法
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mxxxxAPI= xxxxAPI.Stub.asInterface(service);
            if (mInnocnAPI != null) {
                try {
                	//设置监听
                    mxxxxAPI.setAPIListener(apiListener);
                    //调用xxxxAPI中的sendUartData方法，将指令a发送到hidl的服务中
                    byte[] a = {0x66, (byte) 0x88, 0x13, 0x02, 0x00, 0x00, 0x03};
                    mxxxxAPI.sendUartData(a);
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
            } else {
                Log.e(TAG, "xxxx API service not available");
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            mInnocnAPI = null;
        }
    };
		
	//数据回调，当a指令发送过去后，返回的数据，在这里接收
    private final APIListener.Stub apiListener = new APIListener.Stub() {
        @Override
        public void onUartDataReceived(byte[] data) throws RemoteException {
            Log.d(TAG,"data = " + data);
            Vector v1 = new Vector(data.length);
            for (int i = 0; i < data.length; i++) {
                int k = data[i]&amp;0xff;
                //Log.d(TAG, "result = " + k);
                v1.add(i,Integer.toHexString(k));
                Log.d(TAG, "v1 = " +  v1.get(i));
            }
        }

        @Override
        public void onDisplayInputStateChanged(int port, int state) throws RemoteException {
            Log.d(TAG, "port =  " + port + "," + "state = " + state);
        }

        @Override
        public void onUsbPortStateChanged(int port, int state) throws RemoteException {

        }
    };

3.如有错误，请指正，谢谢

代码007普通

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