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Android Studio中实现AIDL

AIDL

先来两个传送门:

http://www.cnblogs.com/yydcdut/p/3961545.html Android面试,与Service交互方式

http://www.cnblogs.com/yydcdut/p/3810816.html Android -- Service绑定解绑和aidl

Android Studio AIDL

  • 建立AIDL,通过点击建立AIDL文件:

Android Studio中实现AIDL

  • 建立好之后就出现了AIDL文件:

Android Studio中实现AIDL

  • Build-->Make Project,生成相应的java文件。

    Android Studio中实现AIDL
  • 先看看aidl文件

// ICameraData.aidl package com.yydcdut.cameramvc;  // Declare any non-default types here with import statements  interface ICameraData {     void add(String fileName,int size, long time); }

生成的aidl文件:

/*  * This file is auto-generated.  DO NOT MODIFY.  * Original file: /Users/yuyidong/AndroidStudioProjects/Camera-Camera2-MVC/app/src/main/aidl/com/yydcdut/cameramvc/ICameraData.aidl  */ package com.yydcdut.cameramvc; // Declare any non-default types here with import statements public interface ICameraData extends android.os.IInterface {  /**   * Local-side IPC implementation stub class.   */  public static abstract class Stub extends android.os.Binder implements com.yydcdut.cameramvc.ICameraData {   private static final java.lang.String DESCRIPTOR = "com.yydcdut.cameramvc.ICameraData";   /**    * Construct the stub at attach it to the interface.    */   public Stub() {    this.attachInterface(this, DESCRIPTOR);   }   /**    * Cast an IBinder object into an com.yydcdut.cameramvc.ICameraData interface,    * generating a proxy if needed.    */   public static com.yydcdut.cameramvc.ICameraData asInterface(android.os.IBinder obj) {    if ((obj == null)) {     return null;    }    android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);//根据包名获取本地实现的一个接口的实例,如果是本地service则可以获取到    if (((iin != null) && (iin instanceof com.yydcdut.cameramvc.ICameraData))) {     return ((com.yydcdut.cameramvc.ICameraData) iin);////如果得到的实例是ICameraData的对象,则返回    }    return new com.yydcdut.cameramvc.ICameraData.Stub.Proxy(obj);//如果无法得到本地实现的对象则会返回一个代理对象   }   @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_add: {      data.enforceInterface(DESCRIPTOR);      java.lang.String _arg0;      _arg0 = data.readString();//读取fileName      int _arg1;      _arg1 = data.readInt();//读取size      long _arg2;      _arg2 = data.readLong();//读取time      this.add(_arg0, _arg1, _arg2);      reply.writeNoException();      return true;     }    }    return super.onTransact(code, data, reply, flags);   }   private static class Proxy implements com.yydcdut.cameramvc.ICameraData {    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 void add(java.lang.String fileName, int size, long time) throws android.os.RemoteException {     android.os.Parcel _data = android.os.Parcel.obtain();     android.os.Parcel _reply = android.os.Parcel.obtain();     try {      _data.writeInterfaceToken(DESCRIPTOR);      _data.writeString(fileName);//写入      _data.writeInt(size);//写入      _data.writeLong(time);//写入      mRemote.transact(Stub.TRANSACTION_add, _data, _reply, 0);//调用binderDriver的提供的方法将参数发给服务端      _reply.readException();     } finally {      _reply.recycle();      _data.recycle();     }    }   }   static final int TRANSACTION_add = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);  }  public void add(java.lang.String fileName, int size, long time) throws android.os.RemoteException; }  

代理中也实现了ICameraData接口定义的方法,我们以add方法为例,里面将参数打包发送给Server端。在Server端收到请求后,会调用service中我们实现的那个stub对象(mBinder)的onTransact方法。

如何在Studio中使用

  • 在Service中:
 ICameraData.Stub mStub = new ICameraData.Stub() {  @Override  public void add(String fileName, int size, long time) throws RemoteException {   //............. }; @Override public IBinder onBind(Intent intent) {  return mStub; } 
  • 在Activity中绑定Service:
private ServiceConnection mServiceConnection = new ServiceConnection() {  @Override  public void onServiceConnected(ComponentName name, IBinder service) {   mCameraService = ICameraData.Stub.asInterface(service);   mIsBind = true;  }  @Override  public void onServiceDisconnected(ComponentName name) {   mCameraService = null;   mIsBind = false;  } }; 
  • 调用Service的方法:
mCameraService.add(fileName, size, time);

在Manifest中申明

<service             android:name=".CameraService"             android:process=":remote"></service>

注意

android.os.TransactionTooLargeException

在Android中,进程间通信通过binder实现,bind是通信的数据载体,当序列化后的数据单元过大时,就会出问题,报出android.os.TransactionTooLargeException。官方文档里有说明,最大通常限制为1M.也就是说如果大于1M数据的话,就应该分开传。理论上说,应该都是对象和字符串类型的数据为主,只要不是大图片实体等问题,一般应该够用。

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