Android
7 分钟 读完 (大约 1001 个字)

AIDL

Book.java

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package com.honszeal.processdemo;

import android.os.Parcel;
import android.os.Parcelable;

/**
 * date：2018/3/13 on 16:07
 * desc:
 * author: liuch
 */
public class Book implements Parcelable{

    private int bookId;
    private String bookName;

    protected Book(Parcel in) {
        bookId = in.readInt();
        bookName = in.readString();
    }

    public static final Creator<Book> CREATOR = new Creator<Book>() {
        @Override
        public Book createFromParcel(Parcel in) {
            return new Book(in);
        }

        @Override
        public Book[] newArray(int size) {
            return new Book[size];
        }
    };

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(bookId);
        dest.writeString(bookName);
    }
}

IDE 自动完成

Book.aidl

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package com.honszeal.processdemo;

parcelable Book;

ILibraryManager.aidl

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package com.honszeal.processdemo;

import com.honszeal.processdemo.Book;


interface ILibraryManager {

    List<Book> getNewBookList();

    void donateBook(in Book book);

    int add(int a, int b);

    void log(String message);

}

编译一下

切换到 project 选项卡，在 app -> build -> generated -> source -> aidl -> debug -> 包名 下 找到系统生成的ILibraryManager.java

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package com.honszeal.processdemo;

public interface ILibraryManager extends android.os.IInterface {

    public static abstract class Stub extends android.os.Binder implements com.honszeal.processdemo.ILibraryManager {

        private static final java.lang.String DESCRIPTOR = "com.honszeal.processdemo.ILibraryManager";

        public Stub() {
            this.attachInterface(this, DESCRIPTOR);
        }

        public static com.honszeal.processdemo.ILibraryManager asInterface(android.os.IBinder obj) {
            if ((obj == null)) {
                return null;
            }
            android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
            if (((iin != null) && (iin instanceof com.honszeal.processdemo.ILibraryManager))) {
                return ((com.honszeal.processdemo.ILibraryManager) iin);
            }
            return new com.honszeal.processdemo.ILibraryManager.Stub.Proxy(obj);
        }

        @Override
        public android.os.IBinder asBinder() {
            return this;
        }

        @Override
        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_getNewBookList: {
                    data.enforceInterface(DESCRIPTOR);
                    java.util.List<com.honszeal.processdemo.Book> _result = this.getNewBookList();
                    reply.writeNoException();
                    reply.writeTypedList(_result);
                    return true;
                }
                case TRANSACTION_donateBook: {
                    data.enforceInterface(DESCRIPTOR);
                    com.honszeal.processdemo.Book _arg0;
                    if ((0 != data.readInt())) {
                        _arg0 = com.honszeal.processdemo.Book.CREATOR.createFromParcel(data);
                    } else {
                        _arg0 = null;
                    }
                    this.donateBook(_arg0);
                    reply.writeNoException();
                    return true;
                }
            }
            return super.onTransact(code, data, reply, flags);
        }

        private static class Proxy implements com.honszeal.processdemo.ILibraryManager {
            private android.os.IBinder mRemote;

            Proxy(android.os.IBinder remote) {
                mRemote = remote;
            }

            @Override
            public android.os.IBinder asBinder() {
                return mRemote;
            }

            public java.lang.String getInterfaceDescriptor() {
                return DESCRIPTOR;
            }

            @Override
            public java.util.List<com.honszeal.processdemo.Book> getNewBookList() throws android.os.RemoteException {
                android.os.Parcel _data = android.os.Parcel.obtain();
                android.os.Parcel _reply = android.os.Parcel.obtain();
                java.util.List<com.honszeal.processdemo.Book> _result;
                try {
                    _data.writeInterfaceToken(DESCRIPTOR);
                    mRemote.transact(Stub.TRANSACTION_getNewBookList, _data, _reply, 0);
                    _reply.readException();
                    _result = _reply.createTypedArrayList(com.honszeal.processdemo.Book.CREATOR);
                } finally {
                    _reply.recycle();
                    _data.recycle();
                }
                return _result;
            }

            @Override
            public void donateBook(com.honszeal.processdemo.Book book) throws android.os.RemoteException {
                android.os.Parcel _data = android.os.Parcel.obtain();
                android.os.Parcel _reply = android.os.Parcel.obtain();
                try {
                    _data.writeInterfaceToken(DESCRIPTOR);
                    if ((book != null)) {
                        _data.writeInt(1);
                        book.writeToParcel(_data, 0);
                    } else {
                        _data.writeInt(0);
                    }
                    mRemote.transact(Stub.TRANSACTION_donateBook, _data, _reply, 0);
                    _reply.readException();
                } finally {
                    _reply.recycle();
                    _data.recycle();
                }
            }
        }

        static final int TRANSACTION_getNewBookList = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
        static final int TRANSACTION_donateBook = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
    }

    public java.util.List<com.honszeal.processdemo.Book> getNewBookList() throws android.os.RemoteException;

    public void donateBook(com.honszeal.processdemo.Book book) throws android.os.RemoteException;

}

BookService.java

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public class BookService extends Service {

    private Binder binder = new ILibraryManager.Stub() {
        @Override
        public List<Book> getNewBookList() throws RemoteException {
            return null;
        }

        @Override
        public void donateBook(Book book) throws RemoteException {

        }
    };

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return binder;
    }
}

手写

IBookManager.java

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package com.honszeal.processdemo;

import android.os.IInterface;
import android.os.RemoteException;

import java.util.List;

public interface IBookManager extends IInterface {

    String DESCRIPTOR = "com.honszeal.processdemo.ILibraryManager";
    int TRANSACTION_getNewBookList = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
    int TRANSACTION_donateBook = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);

    List<Book> getNewBookList() throws RemoteException;

    void donateBook(Book book) throws RemoteException;
}

BookManagerImpl

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package com.honszeal.processdemo;

import android.os.Binder;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Parcel;
import android.os.RemoteException;

import java.util.List;

public class BookManagerImpl extends Binder implements IBookManager {

    public BookManagerImpl() {
        this.attachInterface(this, DESCRIPTOR);
    }

    public static IBookManager asInterface(IBinder obj) {
        if (obj == null) {
            return null;
        }

        IInterface iin = obj.queryLocalInterface(DESCRIPTOR);

        if (iin != null && iin instanceof IBookManager) {
            return ((IBookManager) iin);
        }
        return new BookManagerImpl.Proxy(obj);
    }

    @Override
    protected boolean onTransact(int code, Parcel data, Parcel reply, int flags) throws RemoteException {
        switch (code) {
            case INTERFACE_TRANSACTION:
                reply.writeString(DESCRIPTOR);
                return true;
            case TRANSACTION_getNewBookList:
                data.enforceInterface(DESCRIPTOR);
                List<Book> bookList = this.getNewBookList();
                reply.writeNoException();
                reply.writeTypedList(bookList);
                return true;
            case TRANSACTION_donateBook:
                data.enforceInterface(DESCRIPTOR);
                Book arg0;
                if (0 != data.readInt()) {
                    arg0 = Book.CREATOR.createFromParcel(data);
                } else {
                    arg0 = null;
                }
                this.donateBook(arg0);
                reply.writeNoException();
                return true;
        }
        return super.onTransact(code, data, reply, flags);
    }

    @Override
    public List<Book> getNewBookList() throws RemoteException {
        return null;
    }

    @Override
    public void donateBook(Book book) throws RemoteException {

    }

    @Override
    public IBinder asBinder() {
        return this;
    }

    private static class Proxy implements IBookManager {

        private IBinder mRemote;

        public Proxy(IBinder mRemote) {
            this.mRemote = mRemote;
        }

        public String getInterfaceDescriptor() {
            return DESCRIPTOR;
        }

        @Override
        public List<Book> getNewBookList() throws RemoteException {
            Parcel data = Parcel.obtain();
            Parcel reply = Parcel.obtain();

            List<Book> result;

            data.writeInterfaceToken(getInterfaceDescriptor());
            mRemote.transact(TRANSACTION_getNewBookList, data, reply, 0);
            reply.readException();
            result = reply.createTypedArrayList(Book.CREATOR);
            return result;
        }

        @Override
        public void donateBook(Book book) throws RemoteException {
            //
        }

        @Override
        public IBinder asBinder() {
            return mRemote;
        }
    }
}

感觉，就是具体的实现在服务端写，在客户端调用。实际上就是调用了 Proxy 的对应方法，然后 Binder 的 transact 方法 再就是 onTransact 方法。

权限验证

  1. 在 onBind 中进行验证，验证不通过就直接返回 null, 这样验证失败的客户端直接无法绑定服务。
  2. 在 onTransact 中进行验证，验证不通过就直接返回 false。
# Android, Android开发艺术探索
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