AIDL连接池

创建AIDL接口

ISecurityCenter.aidl

interface ISecurityCenter {
    String encrypt(String content);
    String decrypt(String password);
}

ICompute.aidl

interface ICompute {
    int add(int a, int b);
}

IBinderPool.aidl

interface IBinderPool {
    IBinder queryBinder(int binderCode);
}

注意：创建好接口后记得Rebuild一下，让AIDL自动生成相应代码

实现AIDL接口：

public class SecurityCenterImpl extends ISecurityCenter.Stub{
    private static final char SECRET_CODE = '^';

    @Override
    public String encrypt(String content) throws RemoteException {
        char[] chars = content.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            //^运算符，参加运算的两个对象，如果两个相应位为“异”（值不同），则该位结果为1，否则为0。
            chars[i] ^= SECRET_CODE;
        }
        return new String(chars);
    }

    @Override
    public String decrypt(String password) throws RemoteException {
        return encrypt(password);
    }
}

public class ComputeImpl extends ICompute.Stub {

    @Override
    public int add(int a, int b) throws RemoteException {
        return a + b;
    }
}

public class BinderPoolImpl extends IBinderPool.Stub {

    public static final int BINDER_COMPUTE = 0;
    public static final int BINDER_SECURITY_CENTER = 1;
    public BinderPoolImpl() {
        super();
    }

    @Override
    public IBinder queryBinder(int binderCode) throws RemoteException {
        IBinder binder = null;
        switch (binderCode){
            case BINDER_SECURITY_CENTER:{
                binder = new SecurityCenterImpl();
                break;
            }
            case BINDER_COMPUTE:
                binder = new ComputeImpl();
                break;
            default:
                break;
        }
        return binder;
    }
}

创建远程Service

public class BinderPoolService extends Service {
    public static final String TAG = BinderPoolService.class.getSimpleName();
    private Binder mBinderPool = new BinderPoolImpl();
    public BinderPoolService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind: ");
        return mBinderPool;
    }

    @Override
    public void onCreate() {
        Log.d(TAG, "onCreate: ");
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        Log.d(TAG, "onDestroy: ");
        super.onDestroy();
    }
}

注：别忘了在服务中注册服务

实现Binder连接池

在它的内部首先要去绑定远程服务，绑定成功后，客户端可以通过它的queryBinder方法去获取各自对应的Binder

public class BinderPool {
    public static final String TAG = "BinderPool";
    public static final int BINDER_NONE = -1;
    public static final int BINDER_COMPUTE = 0;
    public static final int BINDER_SECURITY_CENTER = 1;

    private static Context mContext;
    private IBinderPool mBinderPool;
    private static BinderPool instance;
    private CountDownLatch mConnectBinderPoolCountDownLatch;

    private BinderPool(Context context){
        mContext = context;
        connectBinderPoolService();
    }

    public static BinderPool getInstance(Context context){
        if(instance == null){
            synchronized (BinderPool.class){
                if(instance == null){
                    instance = new BinderPool(context);
                }
            }
        }
        return instance;
    }

    private synchronized void connectBinderPoolService(){
        mConnectBinderPoolCountDownLatch = new CountDownLatch(1);
        Intent service = new Intent(mContext, BinderPoolService.class);
        mContext.bindService(service, mBinderPoolConnection, Context.BIND_AUTO_CREATE);
    }

    public IBinder queryBinder(int binderCode){
        IBinder binder = null;
        try {
            if(mBinderPool != null){
                binder = mBinderPool.queryBinder(binderCode);
            }
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        return binder;
    }

    private ServiceConnection mBinderPoolConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d(TAG, "onServiceConnected: 服务连接成功");
            mBinderPool = IBinderPool.Stub.asInterface(service);
            try {
                mBinderPool.asBinder().linkToDeath(mBinderPoolDeathRecipient, 0);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
            mConnectBinderPoolCountDownLatch.countDown();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
    };
    
    private IBinder.DeathRecipient mBinderPoolDeathRecipient = new IBinder.DeathRecipient() {
        @Override
        public void binderDied() {
            mBinderPool.asBinder().unlinkToDeath(mBinderPoolDeathRecipient, 0);
            mBinderPool = null;
            connectBinderPoolService();
        }
    };
}

调用代码：

BinderPool binderPool = BinderPool.getInstance(MainActivity.this);
new Handler().postDelayed(() -> {
    IBinder securityBinder = binderPool.queryBinder(BinderPool.BINDER_SECURITY_CENTER);
    mSecurityCenter = SecurityCenterImpl.asInterface(securityBinder);
    Log.d(TAG, "doWork: visit ISecurityCenter");
    String msg = "helloWorld-安卓";
    System.out.println("content:"+msg);
    try {
        String password = mSecurityCenter.encrypt(msg);
        System.out.println("encrypt :"+password);
        System.out.println("decrypt:"+mSecurityCenter.decrypt(password));
    } catch (RemoteException e) {
        e.printStackTrace();
    }
    Log.d(TAG, "doWork: visit ICompute");
    IBinder computeBinder = binderPool.queryBinder(BinderPool.BINDER_COMPUTE);
    mCompute = ComputeImpl.asInterface(computeBinder);
    try {
        System.out.println("3 + 5 = "+mCompute.add(3, 5));
    } catch (RemoteException e) {
        e.printStackTrace();
    }
}, 2000);

最后附上效果图：

最后

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