private final IRemoteService.Stub binder = new IRemoteService.Stub() {
    public int getPid(){
        return Process.myPid();
    }
    public void basicTypes(int anInt, long aLong, boolean aBoolean,
        float aFloat, double aDouble, String aString) {
        // Does nothing
    }
};

public class RemoteService extends Service {
    private final String TAG = "RemoteService";
    @Override
    public void onCreate() {
        super.onCreate();
    }
    @Override
    public IBinder onBind(Intent intent) {
        // Return the interface
        Log.d(TAG, "onBind");
        return binder;
    }
    private final IRemoteService.Stub binder = new IRemoteService.Stub() {
        public int getPid() {
            return Process.myPid();
        }
        public void basicTypes(int anInt, long aLong, boolean aBoolean,
                               float aFloat, double aDouble, String aString) {
            Log.d(TAG, "basicTypes anInt:" + anInt + ";aLong:" + aLong + ";aBoolean:" + aBoolean + ";aFloat:" + aFloat + ";aDouble:" + aDouble + ";aString:" + aString);
        }
    };
}

        <service
            android:name=".RemoteService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.aidl"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </service>

IRemoteService iRemoteService;
private ServiceConnection mConnection = new ServiceConnection() {
    // Called when the connection with the service is established
    public void onServiceConnected(ComponentName className, IBinder service) {
        // Following the example above for an AIDL interface,
        // this gets an instance of the IRemoteInterface, which we can use to call on the service
        iRemoteService = IRemoteService.Stub.asInterface(service);
    }

    // Called when the connection with the service disconnects unexpectedly
    public void onServiceDisconnected(ComponentName className) {
        Log.e(TAG, "Service has unexpectedly disconnected");
        iRemoteService = null;
    }
};

public class MainActivity extends AppCompatActivity {
    private final String TAG = "ClientActivity";
    private IRemoteService iRemoteService;
    private Button mBindServiceButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mBindServiceButton = findViewById(R.id.btn_bind_service);
        mBindServiceButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = mBindServiceButton.getText().toString();
                if ("Bind Service".equals(text)) {
                    Intent intent = new Intent();
                    intent.setAction("com.example.aidl");
                    intent.setPackage("com.example.aidl.server");
                    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
                } else {
                    unbindService(mConnection);
                    mBindServiceButton.setText("Bind Service");
                }
            }
        });
    }
    ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.d(TAG, "onServiceDisconnected");
            iRemoteService = null;
        }
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.d(TAG, "onServiceConnected");
            iRemoteService = IRemoteService.Stub.asInterface(service);
            try {
                int pid = iRemoteService.getPid();
                int currentPid = Process.myPid();
                Log.d(TAG, "currentPID: " + currentPid + ", remotePID: " + pid);
                iRemoteService.basicTypes(12, 123, true, 123.4f, 123.45,
                        "服務(wù)端你好，我是客戶端");
            } catch (RemoteException e) {
                e.printStackTrace();
            }
            mBindServiceButton.setText("Unbind Service");
        }
    };
}

// Rect.aidl
package com.example.aidl.server;

// Declare Rect so AIDL can find it and knows that it implements
// the parcelable protocol.
parcelable Rect;

public class Rect implements Parcelable {
    private int left;
    private int top;
    private int right;
    private int bottom;
    public Rect(int left, int top, int right, int bottom) {
        this.left = left;
        this.top = top;
        this.right = right;
        this.bottom = bottom;
    }
    public static final Parcelable.Creator<Rect> CREATOR = new Parcelable.Creator<Rect>() {
        public Rect createFromParcel(Parcel in) {
            return new Rect(in);
        }

        public Rect[] newArray(int size) {
            return new Rect[size];
        }
    };
    private Rect(Parcel in) {
        readFromParcel(in);
    }
    @Override
    public void writeToParcel(Parcel out, int flags) {
        out.writeInt(left);
        out.writeInt(top);
        out.writeInt(right);
        out.writeInt(bottom);
    }
    public void readFromParcel(Parcel in) {
        left = in.readInt();
        top = in.readInt();
        right = in.readInt();
        bottom = in.readInt();
    }
    @Override
    public int describeContents() {
        return 0;
    }
    @NonNull
    @Override
    public String toString() {
        return "Rect[left:" + left + ",top:" + top + ",right:" + right + ",bottom:" + bottom + "]";
    }
}

// IRemoteService.aidl
package com.example.aidl.server;
import com.example.aidl.server.Rect;
// Declare any non-default types here with import statements
interface IRemoteService {
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
    void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat,
            double aDouble, String aString);

    int getPid();
    void addRectInOut(inout Rect rect);
}

    ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            iRemoteService = IRemoteService.Stub.asInterface(service);
            try {
                iRemoteService.addRectInOut(new Rect(1, 2, 3, 4));
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    };