第十六单元 Service进程间通信_service-type: transparent-优快云博客

本文链接：https://blog.youkuaiyun.com/Transparent_v/article/details/97036023

本文详细介绍了Android系统中Service进程间通信（IPC）的具体实现方式。通过客户端和服务端的代码示例，展示了如何使用Messenger机制进行跨进程的数据传递。客户端能够向服务端发送消息，并接收来自服务端的响应。

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Service进程间通信

服务端的代码:

public class MyService extends Service {
    @SuppressLint("HandlerLeak")
    Messenger messenger=new Messenger(new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            Bundle bundle = msg.getData();
            String server = bundle.getString("server", "客户端还没有发送");
            Log.i("TAG", "handleMessage: "+server);

            //给客户端发送消息 信使
            Messenger messengers=msg.replyTo;
            Message obtain = Message.obtain();
            Bundle bundle1 = new Bundle();
            bundle1.putString("client","给客户端发送一个值");
            obtain.setData(bundle1);
            try {
                messengers.send(obtain);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    });

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        return messenger.getBinder();
    }
}

服务的清单文件

<service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.baby"></action>
            </intent-filter>
        </service>

客户端的代码

   public class MessageActivity extends AppCompatActivity {
        Messenger messenger=new Messenger(new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                Bundle data=msg.getData();
                String string=data.getString("client","没有纸");
                Log.i("TAG", "handleMessage: "+string);

        }
    });
    private ServiceConnection connection=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Messenger messenger2=new Messenger(service);
            Message obtain = Message.obtain();
            Bundle bundle = new Bundle();
            bundle.putString("server","你好服务器！");
            obtain.setData(bundle);
            obtain.replyTo=messenger;
            try {
                messenger.send(obtain);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_message);
        Intent intent=new Intent();
        intent.setAction("com.baby");
        intent.setPackage("com.example.message");
        bindService(intent,connection, Service.BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(connection);
    }
}