android 进程间通信之aidl

android 进程间通信之aidl

android 进程间通信之aidl 多个客户端， 多线程， IPC 

第一步： 创建一个ITestAidl.aidl 文件

Eclipse 下回自动在gen文件夹下生成一个相应的ITestAidl.java文件

第二步： 创建一个服务， 

返回的一个binder对象  继承ITestAidl.Stub   

第三步： 在客户端， 绑定服务， 通过ServiceConnection 获取IBinder对象， 

获取服务器的数据

Service中返回一个IBinder对象实现了 aidl接口中的Stub (继承了IBinder)

客户端绑定服务，通过ServiceConnection 获取Service中的IBinder,

在客户端进行传输数据， 并返回结果， 

aidl底层实现

客户端实现：

package com.android.hellosumaidl;import android.os.Bundle;import android.os.IBinder;import android.os.RemoteException;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;public class HelloSumAidlActivity extends Activity {IAdditionService service;AdditionServiceConnection connection;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);initService();Button buttonCalc = (Button)findViewById(R.id.buttonCalc);buttonCalc.setOnClickListener(new OnClickListener() {TextView result = (TextView)findViewById(R.id.result);EditText value1 = (EditText)findViewById(R.id.value1);EditText value2 = (EditText)findViewById(R.id.value2);@Overridepublic void onClick(View v) {int v1, v2, res = -1;v1 = Integer.parseInt(value1.getText().toString());v2 = Integer.parseInt(value2.getText().toString());try {res = service.add(v1, v2);} catch (RemoteException e) {e.printStackTrace();}result.setText(Integer.valueOf(res).toString());}});}@Overrideprotected void onDestroy() {super.onDestroy();releaseService();}/* * This inner class is used to connect to the service */class AdditionServiceConnection implements ServiceConnection {public void onServiceConnected(ComponentName name, IBinder boundService) {service = IAdditionService.Stub.asInterface((IBinder)boundService);Toast.makeText(HelloSumAidlActivity.this, "Service connected", Toast.LENGTH_LONG).show();}public void onServiceDisconnected(ComponentName name) {service = null;Toast.makeText(HelloSumAidlActivity.this, "Service disconnected", Toast.LENGTH_LONG).show();}}/* * This function connects the Activity to the service */private void initService() {connection = new AdditionServiceConnection();Intent i = new Intent();i.setClassName("com.android.hellosumaidl", com.android.hellosumaidl.AdditionService.class.getName());boolean ret = bindService(i, connection, Context.BIND_AUTO_CREATE);}/* * This function disconnects the Activity from the service */private void releaseService() {unbindService(connection);connection = null;}}

将gen文件夹下的.aidl生成的IAdditionService.java

文件 拷出来看以一看：

public interface IAdditionService extends android.os.IInterface{/** Local-side IPC implementation stub class. */public static abstract class Stub extends Binder implements IAdditionService{private static final String DESCRIPTOR = "com.android.hellosumaidl.IAdditionService";/** 构造函数. */public Stub(){this.attachInterface(this, DESCRIPTOR);}/**  创建一个IBinder对象 在需要代理的时候 */public static IAdditionService asInterface(IBinder obj){if ((obj==null)) {return null;}IInterface iin = obj.queryLocalInterface(DESCRIPTOR);if (((iin!=null)&&(iin instanceof IAdditionService))) {return ((IAdditionService)iin);}return new IAdditionService.Stub.Proxy(obj);}@Override public  IBinder asBinder(){return this;}@Override public boolean onTransact(int code, Parcel data, Parcel reply, int flags) throws android.os.RemoteException{switch (code){case INTERFACE_TRANSACTION:{reply.writeString(DESCRIPTOR);return true;}case TRANSACTION_add:{data.enforceInterface(DESCRIPTOR);int _arg0;_arg0 = data.readInt();int _arg1;_arg1 = data.readInt();int _result = this.add(_arg0, _arg1);reply.writeNoException();reply.writeInt(_result);return true;}}return super.onTransact(code, data, reply, flags);}private static class Proxy implements IAdditionService{private IBinder mRemote;Proxy(android.os.IBinder remote){mRemote = remote;}@Override public android.os.IBinder asBinder(){return mRemote;}public java.lang.String getInterfaceDescriptor(){return DESCRIPTOR;}// You can pass the value of in, out or inout// The primitive types (int, boolean, etc) are only passed by in@Override public int add(int value1, int value2) throws android.os.RemoteException{android.os.Parcel _data = android.os.Parcel.obtain();android.os.Parcel _reply = android.os.Parcel.obtain();int _result;try {_data.writeInterfaceToken(DESCRIPTOR);_data.writeInt(value1);_data.writeInt(value2);mRemote.transact(Stub.TRANSACTION_add, _data, _reply, 0);_reply.readException();_result = _reply.readInt();}finally {_reply.recycle();_data.recycle();}return _result;}}static final int TRANSACTION_add = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);}// You can pass the value of in, out or inout// The primitive types (int, boolean, etc) are only passed by inpublic int add(int value1, int value2) throws android.os.RemoteException;}