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Android进程间通信---AIDL接口回调

Android进程间通信---AIDL接口回调

作者: 喝拿铁撸铁 | 来源:发表于2021-04-14 15:31 被阅读0次

    先回顾一下aidl的使用方法,可以参考上篇介绍的AIDL怎么用,链接如下:

    https://www.jianshu.com/p/86d7c81eb6f8

    Server端:

    1、创建aidl接口文件以及数据(Parcelable)文件;

    2、创建service文件,在AndroidManifest.xml中声明action;

    3、在service文件中添加IxxxInterface.Stub,以及对应aidl接口实现,例如:

        private IMediaShareInterface.StubmIMediaShareMgr = new IMediaShareInterface.Stub() {

            @Override

            public void onMediaSharing(MediaDatadata) throws RemoteException {

            }

    };

    Client端:

    1、    创建和server端相应的aidl文件(可以直接从server端复制一份);

    2、     在Activity中添加ServiceConnection,在onStart中添加bindService,在onStop中添加unbindService,例如:

        private ServiceConnection mServiceConnection =new ServiceConnection() {

            @Override

            public voidonServiceConnected(ComponentName componentName, IBinder service) {

         }

            @Override

            public voidonServiceDisconnected(ComponentName componentName) {

            }

    };

    在项目开发过程中,有时候会碰到以下类似的场景:在两个app建立了Binder通信后,Client端需要Server端的某个状态,才能触发将数据传给Server端。但是Client端并没有接口可以回调来处理记录这个状态。这个时候就需要增加一个回调接口,来实现以上功能。框架流程大概如下:

    图1

    1、创建一个aidl接口,增加需要回调的接口,例如:

    //IVoipTransferInterface.aidl

    package com.suning.voicetransfer;

    import com.suning.voicetransfer.IVoiceTransferListener;

    import com.suning.voicetransfer.VoiceData;

    interface IVoiceTransferInterface {

        void setVoiceTransferListener(IVoiceTransferListenerlistener);

        void onVoiceTransfer(in VoiceDatadata);

    }

    2、在原有aidl接口基础上再新增一个接口,再把这个aidl接口类作为参数,这样Client端在收到onServiceConnected时,就可以将接口设置进来。例如:

    privateboolean mIsSendVoip;

    private IVoiceTransferInterface mIVoiceTransferMgr;

    private ServiceConnection mServiceConnection = new ServiceConnection() {

        @Override

        public void onServiceConnected(ComponentNamecomponentName, IBinder service) {

            if (service != null) {

                try {

                    service.linkToDeath(mDeathRecipient,0);

                } catch (RemoteException e) {

                    e.printStackTrace();

                }

            }

            mIsSendVoip = false;

            mIVoiceTransferMgr =IVoiceTransferInterface.Stub.asInterface(service);

            if (mIVoiceTransferMgr != null) {

                try {

                    mIVoiceTransferMgr.setVoiceTransferListener(mVoiceTransferListener);

                } catch (RemoteException e) {

                    e.printStackTrace();

                }

            }

        }

        @Override

        public void onServiceDisconnected(ComponentNamecomponentName) {

        }

    };

    其中IVoiceTransferInterface就是新增的接口类 ,在建立连接(onServiceConnected)后, 将这个接口类以参数形式传入:

    mIVoiceTransferMgr.setVoiceTransferListener(mVoiceTransferListener);

    3、设置好了以后,在Server端需要数据传输时,执行registerVoiceTransfer的接口方法,断开数据传输时,执行unregisterVoiceTransfer。例如在Server端的service中onStartCommand方法作如下处理:

    publicint onStartCommand(Intent intent, int flags, int startId) {

        if (intent == null) {

            return START_STICKY;

        }

        String voiceTransfer =intent.getStringExtra("VoiceTransfer");

        if ("start".equals(voiceTransfer)){

            mIsSendVoiceData = true;

            if (mIVoiceTransferListener != null){

                try {

                    mIVoiceTransferListener.registerVoiceTransfer();

                } catch (RemoteException e) {

                    e.printStackTrace();

                }

            }

        } else if ("stop".equals(voiceTransfer)){

            mIsSendVoiceData = false;

            if (mIVoiceTransferListener != null){

                try {

                    mIVoiceTransferListener.unregisterVoiceTransfer();

                } catch (RemoteException e) {

                    e.printStackTrace();

                }

            }

        }

        return START_STICKY;

    }

    在Server端执行到mIVoiceTransferListener.registerVoiceTransfer()时,Client端相应执行registerVoiceTransfer():

    privateIVoiceTransferListener mVoiceTransferListener = new IVoiceTransferListener.Stub(){

        @Override

        public void registerVoiceTransfer() throwsRemoteException {

            mIsSendVoip = true;

            setEnableVoip(mIsSendVoip);

        }

        @Override

        public void unregisterVoiceTransfer()throws RemoteException {

            mIsSendVoip = false;

            setEnableVoip(mIsSendVoip);

        }

    };

    Client端收到注册通知后,设置一些状态以及开启数据传输接口。这样就起到控制数据传输的目的了。

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