Android Wifip2p:为什么接入群主后群信息为空？

Question

我正在尝试将多个设备连接到我手动选择的组所有者

我希望对等节点在找到群主后手动连接到他

我有3个电话(没有模拟器)，在每个有一个“创建组”按钮与此点击处理程序

public void createWifiGroup(View view) {

    mManager.createGroup(mChannel, new WifiP2pManager.ActionListener() {
        @Override
        public void onSuccess() {

            mManager.requestGroupInfo(mChannel,new MyGroupInfoListener(MainActivity.this));

        }

        @Override
        public void onFailure(int reason) {

        }
    });

}

如您所见，我执行了requestGroupInfo操作，并向它传递了一个监听程序，该监听程序在日志中打印以下行：

groupFormed: true isGroupOwner: true groupOwnerAddress: /192.168.49.1

所以我想它成功了

我还有一个MyPeerListener类，当收到WIFI_P2P_PEERS_CHANGED_ACTION操作意图时，BroadCastReceiver会调用它。

MyPeerListener将遍历对等节点并在找到组所有者时进行连接

 @Override
    public void onPeersAvailable(WifiP2pDeviceList wifiP2pDeviceList) {
        this.wifiP2pDeviceList = wifiP2pDeviceList;
        //Toast toast = Toast.makeText(receiver.mActivity, "I found some peers", Toast.LENGTH_LONG);
        // toast.show();
        Iterator<WifiP2pDevice> deviceListIterator = wifiP2pDeviceList.getDeviceList().iterator();
        boolean foundGroup = false;
        while (deviceListIterator.hasNext()) {
            final WifiP2pDevice device = deviceListIterator.next();
            if (!foundGroup && device.isGroupOwner() && !MainActivity.connected) {

                //MainActivity.mManager.removeGroup(MainActivity.mChannel, null);

                foundGroup = true;

                final WifiP2pConfig config = new WifiP2pConfig();
                //config.wps.setup = WpsInfo.PBC;
                config.groupOwnerIntent = 0;
                config.deviceAddress = device.deviceAddress;

                MainActivity.mManager.connect(MainActivity.mChannel, config, new WifiP2pManager.ActionListener() {

                    @Override
                    public void onSuccess() {
                        //success logic
                        Toast toast = Toast.makeText(receiver.mActivity, "connect success", Toast.LENGTH_SHORT);
                        toast.show();
                        MainActivity.connected = true;
                        MainActivity.mManager.requestGroupInfo(MainActivity.mChannel, new MyGroupInfoListener(receiver.mActivity));
                        MainActivity.mManager.requestConnectionInfo(MainActivity.mChannel, new MyConnectionInfoListener(receiver));


                    }

                    @Override
                    public void onFailure(int reason) {
                        //failure logic
                        //MainActivity.connected = false;
                        Toast toast = Toast.makeText(receiver.mActivity, "connect fail, reason: " + reason, Toast.LENGTH_LONG);
                        toast.show();
                    }

                });
            }
            ListView list = (ListView) receiver.mActivity.findViewById(R.id.device_list_view);
            list.setAdapter(new DeviceListViewAdapter(this, receiver.mActivity));
        }

        }


    }

(我知道静态变量的使用和整体糟糕的设计，但这是一个需要学习的快速原型)

现在我得到了一个connect success Toast，但是连接之后的requestConnectionInfo显示了这一行

groupFormed: false isGroupOwner: false groupOwnerAddress: null

调用requestGroupInfo还会显示：

group is null

这种情况经常发生，大约有80%的情况发生。有时它会显示默认组IP 192.168.49.1。但如果两部“从属”手机都有正确的群组信息，那我就很幸运了。

当我尝试在组信息为空的情况下将套接字连接到所有者时，会失败并返回destination host unreachable。但是当群组信息正确时，我可以正确地连接和发送数据。

那么为什么会发生这种情况呢？怎么可能连接成功，但组为空呢？

Answer 1

我重新做了整个项目，发现只有一个错误。

我在做

mManager.connect(...,new ActionListener(){
@Override
onSuccess(){
    //Here I called requestConnectionInfo right after the pairing happens
    mManager.requestConnectionInfo(myConnectionInfoListener);
    Socket socket = new Socket();
    // try to connect and send data....

}

@Override
onFailure(int reason){

}

});

因此，我从connect()的onSuccess()回调中删除了requestConnectionInfo()，并将其放在扩展BroadcastReceiver的MyWifiDirectBroadcastReceiver中

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();

    if (WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION.equals(action)) {
        // Check to see if Wi-Fi is enabled and notify appropriate activity
    } else if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
        // Call WifiP2pManager.requestPeers() to get a list of current peers
    } else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
        //Here is where the request for connection info should happen
        //As sometimes the pairing can happen but the devices 
        //might still be negotiating group owner for example
        mManager.requestConnectionInfo(myConnectionInfoListener());
    } else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
        // Respond to this device's wifi state changing
    }
}

MyConnectionInfoListener在此更改后从不返回空信息，并且我连接到侦听器提供的IP时没有任何问题。