android 实现aidl跨进程通信之一

1,aidl通信实现步骤

本文基于android 6.0,是一个简单的例子,演示如何通过aidl进行跨进程通信。

目标:

1,创建2个进程,一个服务端,一个客户端。

2,客户端和服务端进行绑定,通过aidl跨进行调用以及回调。

1,创建2个工程

在packages/apps 路径下创建2个工程,

example：作为客户端  包名: com.android.example

exampleservice: 作为服务端  包名: com.android. exampleservice

2,aidl文件创建和编译

在2个工程的路径 src/com/android/aidl/ 下分别创建2个相同的aidl文件。

IObdData.aidl内容如下,

package com.android.aidl; import com.android.aidl.ICallback; interface IObdData { String getData(String sr); void sendMessage(String sr, ICallback callback); }

ICallback.aidl内容如下,

package com.android.aidl; interface ICallback { void onGetResult(String info); }

aidl引用时必须添加路径。

 

将2个aidl文件加入2个工程的编译列表Android.mk中,

LOCAL_SRC_FILES += src/com/android/aidl/IObdData.aidl \ src/com/android/aidl/ICallback.aidl

3,客户端

客户端的ExampleActivity.java文件内容如下,

package com.android.example; import android.app.Activity; import android.content.ComponentName; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.os.RemoteException; import android.util.Log; import com.android.aidl.IObdData; import com.android.aidl.ICallback; public class ExampleActivity extends Activity { private static String TAG = "Example "; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Intent intent = new Intent("com.android.exampleservice.aidl.ExampleService"); ComponentName component = new ComponentName("com.android.exampleservice", "com.android.exampleservice.ExampleService"); intent.setComponent(component); bindService(intent, conndata, BIND_AUTO_CREATE); // 绑定服务 } private ServiceConnection conndata = new ServiceConnection() { @Override public void onServiceDisconnected(ComponentName name) { Log.d(TAG, "onServiceDisconnected"); // 解绑 } @Override public void onServiceConnected(ComponentName name, IBinder service) { //已绑定 IObdData mObdData = IObdData.Stub.asInterface(service); try { String mobddata = mObdData.getData("mydata"); // 跨进程调用服务端的方法 Log.d(TAG,"mobddata " + mobddata); mObdData.sendMessage("sendMessage",mCallback); // 跨进程调用服务端的方法 } catch (RemoteException e) { e.printStackTrace(); } } }; private ICallback.Stub mCallback = new ICallback.Stub() { @Override public void onGetResult(String arg) throws RemoteException {// 跨进程回调 Log.d(TAG, "onGetResult = " + arg); } }; @Override public void onStop() { super.onStop(); unbindService(conndata); } }

4,服务端

服务端的ExampleService.java文件如下,

package com.android.exampleservice; import android.app.Service; import android.os.Bundle; import android.content.Intent; import android.os.IBinder; import android.util.Log; import android.os.Handler; import android.os.Message; import android.os.RemoteException; import com.android.aidl.IObdData; import com.android.aidl.ICallback; public class ExampleService extends Service { private ICallback mICallback; // 回调 private static String TAG = " exampleservice "; @Override public void onCreate() { Log.d(TAG,"ExampleService: onCreate "); } private IObdData.Stub mDataBinder = new IObdData.Stub() { @Override public String getData(String sr){ // 实现getData方法 Log.d(TAG,"IObdData: getData " + sr); return sr + "getData "; } @Override public void sendMessage(String sr, ICallback mcallback){ // 实现sendMessage方法 Log.d(TAG,"IObdData: sendMessage " + sr); mICallback = mcallback; Message msg = mHandler.obtainMessage(); msg.what = OUT_SEND; mHandler.sendMessageDelayed(msg,5000); } }; public static final int OUT_SEND = 10; public final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case OUT_SEND: try { mICallback.onGetResult("sendMessage success");// 回调 } catch (RemoteException e) { e.printStackTrace(); } break; } } }; @Override public IBinder onBind(Intent intent) { return mDataBinder; } }

这里延时5s是模仿耗时操作。

工程的其他内容就不多说了,在系统源码环境下编译,然后安装到机器上就可以运行。