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;    }

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