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Activity 调用Service的方法

2016-11-04 16:55 393 查看
一般来说,Activity调用Service 分为两种:进程内调用和进程间调用。进程内调用时比较常用的一种,在进程内调用中我们常常使用的是bindService来启动Service(关于这种启动方式的好处,才疏学浅就不再这卖弄了)。下面就这两种调用方式分别进行简单介绍:

1.通过bindService来启动Service,并调用Service中的方法。

1.一个简单的Service:

package gu.chuan.hang;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class MyService extends Service {

@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return new MyBinder();
}

public class MyBinder extends Binder{
public MyService getMyService(){
return MyService.this;
}
}
/**
* 在Service中定义这个方法,用于测试
* @return
*/
public String getAuthorName(){
return "guchuanhang";
}
}


2.在Activity中绑定Service并测试效果:

package gu.chuan.hang;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent myServiceIntent = new Intent(MainActivity.this, MyService.class);
bindService(myServiceIntent, mServiceConnection,
Context.BIND_AUTO_CREATE);
}

ServiceConnection mServiceConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MyService myService = ((MyService.MyBinder) service).getMyService();
String authorName = myService.getAuthorName();
Toast.makeText(MainActivity.this, "author name is: " + authorName,
Toast.LENGTH_LONG).show();
}

@Override
public void onServiceDisconnected(ComponentName name) {
}

};
}


3.截个图吧,更清楚一点:



2.进程间启动Service并调用Service中的方法

1.首先定义一个aidl文件(扩展名为.aidl):

package gu.chuan.hang.remoteservice.aidl;
interface AuthorInfo{
String getAuthorName();
}


2.定义一个实现了aidl的服务:

package gu.chuan.hang.remoteservice.aidl;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;

public class MyService extends Service{

@Override
public IBinder onBind(Intent intent) {
return new MyStub();
}
private class MyStub extends AuthorInfo.Stub{

@Override
public String getAuthorName() throws RemoteException {
return "guchuanhang";
}

}

}


3.在同一个app中模拟进程间调用的效果,给Service设置remote属性:

<service android:name="gu.chuan.hang.remoteservice.aidl.MyService"
android:process=":remote"
android:exported="false"
>
</service>


4.启动并调用Service中的方法:

public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Intent intent=new Intent(this,MyService.class);
startService(intent);
bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);
}

private ServiceConnection  mServiceConnection=new ServiceConnection(){
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
AuthorInfo authorInfo=AuthorInfo.Stub.asInterface(service);
try {
String authorName=authorInfo.getAuthorName();
Toast.makeText(MainActivity.this, "author name is: "+authorName, Toast.LENGTH_LONG).show();
} catch (RemoteException e) {
e.printStackTrace();
}

}
@Override
public void onServiceDisconnected(ComponentName name) {
}
};

}


5.附上效果截图:



6.关于aidl进程间调用是参考了http://www.cnblogs.com/zhangdongzi/archive/2012/01/09/2317197.html
大神之作,进行的精简修改。

3.附上Demo下载地址:

http://download.csdn.net/detail/guchuanhang/9155121
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