本地Service的bindService的使用方法

1、建本地服务端

package com.tang.Javen;

import android.app.Service;

public class ProcessInService extends Service
{
private String TAG = "ProcessInService";

@Override
public void onCreate()
{
// TODO Auto-generated method stub
Log.d(TAG, "onCreate");
super.onCreate();
}

@Override
public void onDestroy()
{
// TODO Auto-generated method stub
Log.d(TAG, "onDestroy");
super.onDestroy();
}

@Override
public void onStart(Intent intent, int startId)
{
// TODO Auto-generated method stub
Log.d(TAG, "onStart");
super.onStart(intent, startId);
}

@Override
public boolean onUnbind(Intent intent)
{
// TODO Auto-generated method stub
Log.d(TAG, "onUnbind");
return super.onUnbind(intent);
}

@Override
public IBinder onBind(Intent arg0)
{
// TODO Auto-generated method stub
Log.d(TAG, "onBind");
return new TestBinder();
}
class TestBinder extends Binder
{
public void printName(String name)
{
Log.d(TAG, "printName ="+name);
}
}
}

重点在onBind方法的返回值这里，当客户端通过bindService调用该Service时，会调用这个Service中的onBind函数，这里我们return new TestBinder(); 然后自定义一个类TestBinder继承Binder，这样服务端就可以了。
2、在AndroidManifest.xml中声明这二个服务

   <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".ProcessInServiceActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name="com.tang.Javen.ProcessInService">
            
        </service>
    </application>

3、构建客户端，新建一个ProcessInServiceActivity，在这个Activity中调用服务

package com.tang.Javen;

import android.app.Activity;

public class ProcessInServiceActivity extends Activity {
    /** Called when the activity is first created. */
private Button startServiceBtn, stopServiceBtn;
private ProcessInService.TestBinder iBinder;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startServiceBtn = (Button)findViewById(R.id.onbind);
        stopServiceBtn = (Button)findViewById(R.id.unbind);
        
        
        startServiceBtn.setOnClickListener(new OnClickListener()
{

public void onClick(View v)
{
// TODO Auto-generated method stub
Intent intent = new Intent(ProcessInServiceActivity.this, ProcessInService.class);
bindService(intent, conn, ProcessInServiceActivity.this.BIND_AUTO_CREATE);
}
});
        
        stopServiceBtn.setOnClickListener(new OnClickListener()
{

public void onClick(View v)
{
// TODO Auto-generated method stub
unbindService(conn);
}
});
        
        
    }
    
    private ServiceConnection conn = new ServiceConnection()
{

public void onServiceDisconnected(ComponentName name)
{
// TODO Auto-generated method stub

}

public void onServiceConnected(ComponentName name, IBinder service)
{
// TODO Auto-generated method stub
iBinder = (ProcessInService.TestBinder)service;
iBinder.printName(" Hello Javen.tang ");
}
};
}

在客户端重点在于new ServiceConnection()，然后当使用bindService连接上了服务之后就会调用onServiceConnected获取Service中onBind返回的IBinder。

点击绑定服务可以看到Hello Javen.tang这个打印说明服务启动成功。

使用AIDL跨进程访问服务

1、构建服务端，首先在src目录下新建一个com.tang.aidl的包，然后在该包中新建一个IPerson.aidl文件

package com.tang.aidl;

interface IPerson
{
String printName(String name);
}

这样eclipse会根据这个aidl文件自动在gen目录下生成一个相同包名的IPerson.java文件

这样接口文件就有了，然后编写Service文件，新建一个AIDLService

package com.tang.Javen;

import android.app.Service;

public class AIDLService extends Service {
    /** Called when the activity is first created. */
private String TAG = "AIDLService";
IPerson.Stub stub = new IPerson.Stub()
{

public String printName(String name) throws RemoteException
{
// TODO Auto-generated method stub
Log.d(TAG, "Hello" + name);
return "Hello" + name;
}
};

@Override
public IBinder onBind(Intent arg0)
{
// TODO Auto-generated method stub
return stub;
}

@Override
public void onCreate()
{
// TODO Auto-generated method stub
super.onCreate();
}

@Override
public void onDestroy()
{
// TODO Auto-generated method stub
super.onDestroy();
}

@Override
public void onStart(Intent intent, int startId)
{
// TODO Auto-generated method stub
super.onStart(intent, startId);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
// TODO Auto-generated method stub
return super.onStartCommand(intent, flags, startId);
}

@Override
public boolean onUnbind(Intent intent)
{
// TODO Auto-generated method stub
return super.onUnbind(intent);
}
}

这里可以看到跟本地调用service的方法没有什么区别，只有在onBind的返回值这里是有不一样的，这里返回的是stub，而stub则是IPerson.Stub

IPerson.Stub stub = new IPerson.Stub()
{

public String printName(String name) throws RemoteException
{
// TODO Auto-generated method stub
Log.d(TAG, "Hello" + name);
return "Hello" + name;
}
};

然后在AndroidManifest.xml中注册该服务

        <service android:name="com.tang.Javen.AIDLService">
            <intent-filter>
                <action android:name="android.intent.action.tang.AIDLService"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </service>

最后，这里写一个Activiy便于启动该service到虚拟机中去

package com.tang.Javen;

import android.app.Activity;

public class AIDLServiceActivity extends Activity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

}

这样服务端就可以了
2、把service中的aidl文件拷贝到客户端，这样服务端和客户端之间就有共用的接口了

package com.tang.client;

import com.tang.aidl.IPerson;

public class AIDLClientActivity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */
private Button onBindButton, printButton, unBindButton;
private IPerson personProxy;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        onBindButton = (Button)findViewById(R.id.onbind);
        printButton = (Button)findViewById(R.id.print);
        unBindButton = (Button)findViewById(R.id.unbind);
        
        onBindButton.setOnClickListener(this);
        printButton.setOnClickListener(this);
        unBindButton.setOnClickListener(this);
    }
public void onClick(View v)
{
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.onbind:
Intent intent = new Intent("android.intent.action.tang.AIDLService");
bindService(intent, conn, AIDLClientActivity.this.BIND_AUTO_CREATE);
break;
case R.id.print:
try
{
personProxy.printName("Tecon Javen.tang");
} catch (RemoteException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case R.id.unbind:
unbindService(conn);
break;

default:
break;
}
}

private ServiceConnection conn = new ServiceConnection()
{

public void onServiceDisconnected(ComponentName name)
{
// TODO Auto-generated method stub

}

public void onServiceConnected(ComponentName name, IBinder service)
{
// TODO Auto-generated method stub
personProxy = IPerson.Stub.asInterface(service);
}
};
}

这里跟本地服务的调用方法也基本类似，也是通过bindService来连接服务，不同的是在onServiceConnected中讲IBinder service通过IPerson.Stub.asInterface(service)将这个IBinder转化为IPerson。然后通过personProxy这个IPerson调用service中的函数就可以了。这样我们先启动AIDLService，然后在启动AIDLClient

点击onBind后再点击printName这可以看到HelloTecon Javen.tang，这就说明服务调用成功了

记录下来，以便以后查看！

理解Android的本地Service和跨进程Service

本地Service的bindService的使用方法

使用AIDL跨进程访问服务

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