Android基本功：跨进程调用Services(AIDL Service)
投稿于 被查看 33402 次 评论：117
Android基本功：跨进程调用Services(AIDL Service)
package com.example.aidlservice;
interface ICat {
String getColor();
double getWeight();
}
package com.example.aidlservice;
import java.util.Timer;
import java.util.TimerTask;
import com.example.aidlservice.ICat.Stub;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
public class AidlService extends Service {
String[] colors = new String[] { "红色", "黄色", "黑色" };
double[] weights = new double[] { 2.3, 3.1, 1.58 };
private String color;
private double weight;
private CatBinder catBinder;
Timer timer = new Timer();
@Override
public void onCreate() {
super.onCreate();
catBinder = new CatBinder();
timer.schedule(new TimerTask() {
@Override
public void run() {
// 随机地改变service组件内的color，weight属性的值
int rand = (int) (Math.random() * 3);
color = colors[rand];
weight = weights[rand];
System.out.println("---------" + rand);
}
}, 0, 800)};
@Override
public IBinder onBind(Intent arg0) {
/**
* 返回CatBinder对象，在绑定本地Service情况下，
* 该catBinder会直接传给客户端的ServiceConnected对象的ServiceConnected
* ()方法的第二个参数；在绑定远程Service的情况下
* ，只将catBinder对象的代理传给客户端的ServiceConnected对象的ServiceConnected()方法的第二个参数
*/
return catBinder;
}
@Override
public void onDestroy() {
timer.cancel();
}
/**
* 继承Stub,也就是实现了ICat接口，并实现了IBinder接口
*
* @author pengcx
*
*/
public class CatBinder extends Stub {
@Override
public String getColor() throws RemoteException {
return color;
}
@Override
public double getWeight() throws RemoteException {
return weight;
}
}
}
<service android:name="com.example.aidlservice.AidlService" >
<intent-filter>
<action android:name="org.crazyit.aidl.action.AIDL_SERVICE" />
</intent-filter>
</service>
package com.example.aidlclient;
import com.example.aidlservice.ICat;
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.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
public class AidlClient extends Activity {
private ICat catService;
private Button getButton;
private EditText colorEditText, weightEditText;
private ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
catService = null;
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// 获取远程Service的onBinder方法返回的对象代理
catService = ICat.Stub.asInterface(service);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_aidl_client);
getButton = (Button) findViewById(R.id.getbutton);
colorEditText = (EditText) findViewById(R.id.coloredittext);
weightEditText = (EditText) findViewById(R.id.weightedittext);
// 创建所需要绑定的Service的Intent
Intent intent = new Intent();
intent.setAction("org.crazyit.aidl.action.AIDL_SERVICE");
// 绑定远程的服务
bindService(intent, conn, Service.BIND_AUTO_CREATE);
getButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 获取并显示远程service的状态
try {
colorEditText.setText(catService.getColor());
weightEditText.setText(catService.getWeight() + "");
} catch (RemoteException e) {
e.printStackTrace();
}
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
// 解除绑定
this.unbindService(conn);
}
}
用户评论