Android AIDL跨进程调用Service

转自：/article/7711433.html

1. 创建一个android项目如下,点击finish. 如果只是需要提供service，不需要Activity，那么可以把Create Activity的勾去掉。



2. 添加一java文件。



类名为:LongExistService，

superclass为:android.app.Service



3. 打开LongExistService.java, 点击菜单 Source-> Override/implement Method.

选中onCreate(), onDestroy(), onStart(), onStartCommand(), onUnbind().



4. LongExistService.java文件内容为:

package com.pyk.les;

import android.app.Service;

import android.content.Intent;

import android.os.IBinder;

import android.util.Log;

public class LongExistService extends Service {

public int getCount() {

Log.d(TAG, "LongExistService::getCount");

return 0;

}

public String getTime() {

java.util.Date date = new java.util.Date();

Log.d(TAG, "LongExistService::onCreate");

return date.toLocaleString();

}

private final IlongExistService.Stub binder=new IlongExistService.Stub() {

public int getCount() {

Log.d(TAG, "IlongExistService::getCount");

return LongExistService.this.getCount();

}

public String getTime() {

Log.d(TAG, "IlongExistService::getTime");

return LongExistService2.this.getTime();

}

};

final String TAG = "LongExistService";

@Override

public void onCreate() {

Log.d(TAG, "onCreate");

super.onCreate();

}

@Override

public void onDestroy() {

Log.d(TAG, "onDestroy");

super.onDestroy();

}

@Override

public void onStart(Intent intent, int startId) {

Log.d(TAG, "onStart");

super.onStart(intent, startId);

}

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

Log.d(TAG, "onStartCommand");

return super.onStartCommand(intent, flags, startId);

}

@Override

public boolean onUnbind(Intent intent) {

Log.d(TAG, "onUnbind");

return super.onUnbind(intent);

}

@Override

public void onRebind(Intent intent) {

Log.d(TAG, "onRebind");

super.onRebind(intent);

}

@Override

public IBinder onBind(Intent arg0) {

Log.d(TAG, "onBind");

return binder;

}

}

5. 因为增加了AIDL的接口，我们需要先定义一个AIDL文件，比如IlongExistService.aidl.文件内容为:

package com.pyk.les;

interface IlongExistService {
int getCount();
String getTime();
}
这里必须是后缀为aidl,我试过用.java文件定义一个同样的接口，结果不能正常运行。所以这个看来是个必须起名为aidl文件的要求。
6.修改AndroidManifest.xml, 添加如下定义。
<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.pyk.les2" android:versionCode="1" android:versionName="1.0">

<application android:label="Single Service">

<service android:name=".LongExistService">

<intent-filter>

<action android:name="com.pyk.les.IlongExistService"></action>

</intent-filter>

</service>

</application>

<uses-sdk android:minSdkVersion="8" />

</manifest>

7.到此，service已经实现了。下面我们另外生成一个项目的Activity来bind这个service。

按照前面的步骤1. 我们生成一个activity。注意请用另外一个package name。Activity.java的文件内容为:

package com.pyk.client;

import com.pyk.les.IlongExistService;

import android.app.Activity;

import android.app.AlertDialog;

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 android.view.View;

public class MyActivity extends Activity {

final String TAG = "MyActivity";

final Intent myIntent = new Intent("com.pyk.les.IlongExistService");

private boolean startedService = false;

private IlongExistService leservice = null;

ServiceConnection myServiceConnection = new ServiceConnection()

{

public void onServiceConnected(ComponentName name, IBinder service) {

leservice = IlongExistService.Stub.asInterface(service);

}

public void onServiceDisconnected(ComponentName name) {

leservice = null;

}

};

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//myIntent.setClass(this, LongExistService.class);

startedService = bindService(new Intent("com.pyk.les.IlongExistService"), myServiceConnection, BIND_AUTO_CREATE);

try {

Log.i(TAG, "getCount value:" + leservice.getCount());

Log.i(TAG, "getTime value:" + leservice.getTime());

}catch (RemoteException ex)

{}

}

@Override

protected void onDestroy() {

if (startedService)

{

unbindService(myServiceConnection);

}

Log.i(TAG, "onDestroy");

super.onDestroy();

}

}

8. 将IlongExistService.aidl拷贝过来，连同package的目录一起拷贝。然后刷新一下Activity项目，就能在project explorer里看到了。

这样，当Activity启动时，就会bind service并调用service的方法。Activity退出时会unbind。