AIDL简单实例

每一个应用程序都有自己的进程，进程之间不能互相访问，这叫做应用程序沙漏（application sandboxing）
为了能用使应用程序能互相访问,Android提供IPC（interprocess communication protocol）
IPC protocol因为需要整理封装(marshaling/un marshaling数据)而变得复杂。
因此.Android提供 AIDL(Android Interface Definition Language)，它对使用了类似于java的语法,对IPC轻量级实现，并有AIDL工具自动实现stub的创建
实现步骤:
1.定义 the AIDL interface
2.为remote service实现Stub
3.将remote service提供给本地 local client

第一步:定义 the AIDL interface

package com.marakana;// 定义接口]AIDLinterface IAdditionService {    // 可传递标记in, out, or inout.     // Primitive 类型 (例如 int, boolean, etc.) 仅能而其默认是in.int add(in int value1, in int value2);}

第二步:为remote service实现Stub

/*** 这个类实现了remote service 到 Local client 本地*/public class AdditionService extends Service {private static final String TAG = "AdditionService";@Overridepublic void onCreate() {super.onCreate();Log.d(TAG, "onCreate()");}//返回remote 对象@Overridepublic IBinder onBind(Intent intent) {return new IAdditionService.Stub() {/*** Implementation of the add() method*/public int add(int value1, int value2) throws RemoteException {Log.d(TAG, String.format("AdditionService.add(%d, %d)",value1, value2));return value1 + value2;}};}@Overridepublic void onDestroy() {super.onDestroy();Log.d(TAG, "onDestroy()");}}

 
第三步:将remote service提供给本地 local client
利用servcie实现onBind(),就可以连接到remote service

public class AIDLDemo extends Activity {private static final String TAG = \"AIDLDemo\";IAdditionService service;AdditionServiceConnection connection;/*** 这个类实现了真实的remote service的连接.它将IBinder类型的对象，也就是Stub的实现类* 转为 AIDL 接口.    asInterface方法是aild工具产生的比较重要的方法*/class AdditionServiceConnection implements ServiceConnection {public void onServiceConnected(ComponentName name, IBinder boundService) {service = IAdditionService.Stub.asInterface((IBinder) boundService);Log.d(AIDLDemo.TAG, \"onServiceConnected() connected\");Toast.makeText(AIDLDemo.this, \"Service connected\", Toast.LENGTH_LONG).show();}public void onServiceDisconnected(ComponentName name) {service = null;Log.d(AIDLDemo.TAG, \"onServiceDisconnected() disconnected\");Toast.makeText(AIDLDemo.this, \"Service connected\", Toast.LENGTH_LONG).show();}}/** 将Activity绑定到Service. */private void initService() {connection = new AdditionServiceConnection();Intent i = new Intent();i.setClassName(\"com.marakana\", com.marakana.AdditionService.class.getName());boolean ret = bindService(i, connection, Context.BIND_AUTO_CREATE);Log.d(TAG, \"initService() bound with \" + ret);}/** 解除绑定. */private void releaseService() {unbindService(connection);connection = null;Log.d(TAG, \"releaseService() unbound.\");}/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);initService();// Setup the UIButton 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);public 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) {Log.d(AIDLDemo.TAG, \"onClick failed with: \" + e);e.printStackTrace();}result.setText(new Integer(res).toString());}});}/** Called when the activity is about to be destroyed. */@Overrideprotected void onDestroy() {releaseService();}}

   
资源来源：http://marakana.com/forums/android/examples/48.html

源代码:    http://marakana.com/static/tutorials/AIDLDemo.zip