Question

我正在尝试使用Nexus 4连接到WiFi Direct网络。

我有以下代码：

public class MainActivity extends ActionBarActivity {

    WifiP2pManager mWifiP2pManager;
    Channel mChannel;
    WiFiDirectBroadcastReceiver mReceiver;
    IntentFilter mIntentFilter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        mIntentFilter = new IntentFilter();
        mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
        mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
        mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
        mIntentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);

        mWifiP2pManager = (WifiP2pManager)getSystemService(WIFI_P2P_SERVICE);
        mChannel = mWifiP2pManager.initialize(this, getMainLooper(), null);

        ((ImageButton)findViewById(R.id.imageButton_power)).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.d("p2p", "discoverPeers() called");

                mWifiP2pManager.discoverPeers(mChannel, new WifiP2pManager.ActionListener() {

                    @Override
                    public void onSuccess() {
                        Log.d("p2p", "discoverPeers() Success");
                    }

                    @Override
                    public void onFailure(int reason) {
                        Log.d("p2p", "discoverPeers() Failure: " + reason);
                    }
                });
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        mReceiver = new WiFiDirectBroadcastReceiver(mWifiP2pManager, mChannel, this);
        registerReceiver(mReceiver, mIntentFilter);

    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(mReceiver);
    }

}

和BroadcastReceiver：

public class WiFiDirectBroadcastReceiver extends BroadcastReceiver {

    private WifiP2pManager mManager;
    private Channel mChannel;
    private MainActivity mActivity;

    public WiFiDirectBroadcastReceiver(WifiP2pManager manager, Channel channel, MainActivity activity) {
        super();
        this.mManager = manager;
        this.mChannel = channel;
        this.mActivity = activity;
    }

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

        Log.d("p2p", "Action: " + action);

        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)) {
            Log.d("p2p", "Requesting for peers");

            if (mManager != null) {
                mManager.requestPeers(mChannel, peerListListener);
            }
        } else if (WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION.equals(action)) {
            // Respond to new connection or disconnections
        } else if (WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action)) {
            // Respond to this device's wifi state changing
        }
    }

    private WifiP2pManager.PeerListListener peerListListener = new WifiP2pManager.PeerListListener() {
        @Override
        public void onPeersAvailable(WifiP2pDeviceList peers) {
            Log.d("p2p", "deviceCount = " + peers.getDeviceList().size());
        }
    };
}

当我点击按钮时，discoverPeers()会返回成功。但是，我从未获得IntentFilter中指定的任何广播，当我开始/恢复活动时，我会收到一些广播：

02-26 16：19：08.684 7656-7656 / com.example.app D / p2p：行动：   android.net.wifi.p2p.STATE_CHANGED 02-26 16：19：08.684
  7656-7656 / com.example.app D / p2p：行动：   android.net.wifi.p2p.CONNECTION_STATE_CHANGE 02-26 16：19：08.684
  7656-7656 / com.example.app D / p2p：行动：   android.net.wifi.p2p.THIS_DEVICE_CHANGED

但是没有一个是我在IntentFilter上注册的那个，由于某种原因我得到了那些3，尽管它们没有添加到过滤器中。

修改似乎我对字符串的名称感到困惑，并且它们是实际值，我确实收到了一些我添加到IntentFilter的操作。

Answer 1

然后你实际上得到了正确的结果，尽管它们并不像你预期的那样。当您进行p2p状态更改时，您应该看到“android.net.wifi.p2p.CONNECTION_STATE_CHANGE”值。其他过滤器也是如此。查看此页面：http://developer.android.com/reference/android/net/wifi/p2p/WifiP2pManager.html#WIFI_P2P_CONNECTION_CHANGED_ACTION

Answer 2

不确定您是否仍然关注此事，但Google已在WifiP2p参考中添加了一条说明，可以解释此问题。（我遇到的一个问题）在此处找到：http://developer.android.com/training/connect-devices-wirelessly/wifi-direct.html

         // Code for when the discovery initiation is successful goes here.
        // No services have actually been discovered yet, so this method
        // can often be left blank.  Code for peer discovery goes in the
        // onReceive method, detailed below.

从这个注释看来，如果discoverPeers（）成功，你将获得onSuccess（）指示但是你只会收到'WIFI_P2P_PEERS_CHANGED_ACTION'广播，表明如果有可用的对等点，可用对等列表已经改变检测。我用两个运行wifiP2p应用程序的智能手机测试了这个。

我希望这有帮助，如果至少你可能会在google引用中找到答案。

Android WiFi-Direct BroadcastReceiver无法正常工作

2 个答案: