实践AIDL通信-优快云博客

今天阅读Android源码，看到文件SystemUIService.java (frameworks\base\packages\systemui\src\com\android\systemui)

    @Override
    public void onCreate() {
        // Pick status bar or system bar.
        IWindowManager wm = IWindowManager.Stub.asInterface(
                ServiceManager.getService(Context.WINDOW_SERVICE));
        try {
            SERVICES[0] = wm.canStatusBarHide()
                    ? R.string.config_statusBarComponent
                    : R.string.config_systemBarComponent;
        } catch (RemoteException e) {
            Slog.w(TAG, "Failing checking whether status bar can hide", e);
        }

为了更好的理解代码，于是自己也想写一个AIDL的程序。

[1]建立一个工程Leader01_aidl

IMyservice.aidl
package blog.topicmmi.test;
interface IMyService{
   String getValue();
}

MyService.java

package blog.topicmmi.test;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;


public class MyService extends Service
{


  public class MyServiceImpl extends IMyService.Stub
  {
@Override
public String getValue() throws RemoteException
{
return  "我的第一个AIDL程序";
}  
  }
  
  @Override
  public IBinder onBind(Intent intent)
  {
 return new MyServiceImpl();
  }
}

AndroidManifest.xml
        <service android:name=".MyService">
            <intent-filter>
                <action android:name="blog.topicmmi.test.IMyService"/>
            </intent-filter>
        </service>

[2]再建立一个客户端的工程Leader_aidlclient

将Leader01_aidl\gen\blog拷到leader_aidlclient\src

Main.java
package net.blogjava.mobile;
import blog.topicmmi.test.IMyService;
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.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;


public class Main extends Activity implements OnClickListener
{
private IMyService myService = null;
private Button btnInvokeAIDLService;
private Button btnBindAIDLService; 
private TextView textView;
private ServiceConnection serviceConnection = new ServiceConnection()
{

// 当与service的连接建立后被调用
@Override
public void onServiceConnected(ComponentName name, IBinder service)
{
myService = IMyService.Stub.asInterface(service);
btnInvokeAIDLService.setEnabled(true);


}


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


}
};


@Override
public void onClick(View view)
{
switch (view.getId())
{
case R.id.btnBindAIDLService:

//bindService()绑定到一个service．Android系统调用service的onBind()方法，它返回一个用来与service交互的IBinder．

//bindService()会立即返回，它不会返回IBinder给客户端．要接收IBinder，客户端必须创建一个ServiceConnection的实例并传给bindService()．

//ServiceConnection包含一个回调方法，系统调用这个方法来传递要返回的IBinder．
bindService(new Intent("blog.topicmmi.test.IMyService"),
serviceConnection, Context.BIND_AUTO_CREATE);
break;


case R.id.btnInvokeAIDLService:
try
{
textView.setText(myService.getValue());
}
catch (Exception e)
{


}
break;
}




}


@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnInvokeAIDLService = (Button) findViewById(R.id.btnInvokeAIDLService);
btnBindAIDLService = (Button) findViewById(R.id.btnBindAIDLService);
btnInvokeAIDLService.setEnabled(false);
textView = (TextView) findViewById(R.id.textview);
btnInvokeAIDLService.setOnClickListener(this);
btnBindAIDLService.setOnClickListener(this);
}
}

[3]运行后