android 多进程通信,Android中进程间通讯 AIDL

Android中进程间通讯 AIDL

IDL Interface Description Language  接口描述语言

AIDL Android IDL

适用场景：

client进程必须是Activity，服务端进程必须是Service

aidl解决两个项目间通讯(IPC进程间通讯)一个项目里必须有service。另一个项目的activity调用service里的方法需要通过一个共有的接口

步骤：

1.在_b项目中创建一个接口，里面的方法是_b中service里面的内部类Mybinder的binderplay()方法

2.到文件夹的目录里把创建的这个接口改后缀名为.aidl

3.去掉接口的public修饰

4.会在_b的gen目录下生成一个.java的接口文件，把这个拷贝到_a的项目里，两个必须是相同的包名。

5.在_b的内部类Mybinder中继承这个接口.stub

6.在_a的activity的onServiceConnected()方法里，把传来的service强制转换成接口类型

例：mbinder = IMybinder.Stub.asInterface(service);

7.就可以用生成mbinder对象来调用service中的方法

代码如下：

_b项目中创建接口：package com.example.ex0729_aidl_b;

interface IMybinder

{

void binderplay();

void binderstop();

}

_b项目中的sevice代码：public class MyService extends Service

{

class Mybinder extends IMybinder.Stub

{

public void binderplay()

{

MyService.this.play();

}

public void binderstop()

{

MyService.this.stop();

}

}

public MyService()

{

}

@Override

public void onCreate()

{

// TODO Auto-generated method stub

super.onCreate();

Log.e("MyService", "onCreate");

}

@Override

public void onDestroy()

{

Log.e("MyService", "onDestroy");

super.onDestroy();

}

@Override

public boolean onUnbind(Intent intent)

{

// TODO Auto-generated method stub

Log.e("MyService", "onUnbind");

return super.onUnbind(intent);

}

@Override

public IBinder onBind(Intent intent)

{

Log.e("MyService", "onBind");

return new Mybinder();

}

private void play()

{

Log.e("MyService", "play()");

}

public void stop()

{

Log.e("MyService", "stop()");

}

}

_a项目中的Activity里代码：@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button button1 = (Button) findViewById(R.id.button1);

Button button2 = (Button) findViewById(R.id.button2);

Button button3 = (Button) findViewById(R.id.button3);

Button button4 = (Button) findViewById(R.id.button4);

conn = new ServiceConnection()

{

@Override

public void onServiceDisconnected(ComponentName name)

{

// TODO Auto-generated method stub

}

@Override

public void onServiceConnected(ComponentName name, IBinder service)

{

Log.e("MainActivity", service.toString());

mbinder = IMybinder.Stub.asInterface(service);

}

};

button1.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

Intent intent = new Intent();

intent.setAction("com.example.ex0729_aidl_b");//通过隐式意图绑定Service

bindService(intent , conn, BIND_AUTO_CREATE);

}

});

button2.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

unbindService(conn);

}

});

button3.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

try

{

mbinder.binderplay();

}

catch (RemoteException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

button4.setOnClickListener(new OnClickListener()

{

@Override

public void onClick(View v)

{

try

{

mbinder.binderstop();

}

catch (RemoteException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu)

{

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}