Android WiFi Direct android.net.wifi.p2p.PEERS_CHANGED 收到无休止

Posted 2023-02-23

【中文标题】Android WiFi Direct android.net.wifi.p2p.PEERS_CHANGED 收到无休止

【英文标题】：Android WiFi Direct android.net.wifi.p2p.PEERS_CHANGED received endlessly

【发布时间】：2016-01-06 23:36:37

【问题描述】：

社区， 这是我的第一个问题，如果我不小心不符合某些规范或类似规范，请告诉我。

我正在尝试编写一个与 WiFi 直接通信的 android 应用程序。 此时一切正常，但我的 BroadcastReceiver 一次又一次地收到 android.net.wifi.p2p.PEERS_CHANGED 操作。

public class WifiP2PBroadcastReceiver extends BroadcastReceiver 
private final static String TAG = "WifiP2PBR";
private WifiP2pManager _manager;
private WifiP2pManager.Channel _channel;
private Activity _callbackActivity;

private static ArrayList<WifiBroadcastCallback> _arrayList_callbacks;

public WifiP2PBroadcastReceiver(WifiP2pManager manager, WifiP2pManager.Channel channel, Activity callback) 
    _manager = manager;
    _channel = channel;
    _callbackActivity = callback;



/**
 * add a callback to the receiver
 *
 * @param callback
 */
public static void addWifiCallback(WifiBroadcastCallback callback) 
    if(!getCallbacksList().contains(callback))
    
        getCallbacksList().add(callback);
    


public void registerReceiver()

    Log.d(TAG,"registerReceiver called");
    if(_callbackActivity != null) 
        _callbackActivity.registerReceiver(this, getIntentFilter());
    


public void unregisterReceiver() 
    if(_callbackActivity != null) 
        _callbackActivity.unregisterReceiver(this);
    



@Override
public final void onReceive(Context context, Intent intent) 
    Log.d(TAG, "action: "+intent.getAction());
    switch(intent.getAction()) 
        case WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION:
            Log.d(TAG, "state changed action");
            break;
        case WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION:
            Log.d(TAG, "peers changed action");
            notifyPeerUpdate();
            break;
        case WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION:
            Log.d(TAG, "wifi p2p connection changed action");
            NetworkInfo networkInfo = intent.getParcelableExtra(WifiP2pManager.EXTRA_NETWORK_INFO);
            Log.d(TAG,"network info available");
            break;
        case WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION:
            Log.d(TAG, "wifi p2p this device changed action");
            notifyDeviceUpdate();
            WifiP2pDevice thisDevice = intent.getParcelableExtra(WifiP2pManager.EXTRA_WIFI_P2P_DEVICE);
            Log.d(TAG,"this device acquired");
            break;
    


private void notifyPeerUpdate()

    for(WifiBroadcastCallback c : getCallbacksList())
    
        c.onPeersChanged();
    


private void notifyDeviceUpdate()

    for(WifiBroadcastCallback c : getCallbacksList())
    
        c.onDeviceChanged();
    


/**
 * get array list of callbacks
 *
 * @return
 */
private static ArrayList<WifiBroadcastCallback> getCallbacksList() 
    if(_arrayList_callbacks == null) 
        _arrayList_callbacks = new ArrayList<WifiBroadcastCallback>();
    
    return _arrayList_callbacks;


/**
 * interface for callbacks
 */
public interface WifiBroadcastCallback 
    void onDeviceChanged();

    void onPeersChanged();


private IntentFilter getIntentFilter()

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

    return intentFilter;

这是我的 BroadcastReceiver 代码。其他一切都很好，我没有想法，它从无处开始。

【参考方案1】：

确实如此。基本上，你应该在那里做的是用你的 WifiP2pManager 实例调用 requestPeers。然后，您将调用来自 WifiP2pManager.PeerListListener 的 onPeersAvailable 并使用看到的对等点数组，然后您可以在那里检查更改是否是您想要报告的内容。

参考实现可以在我的github projects找到

【讨论】：

好的，所以可以肯定的是，每隔几秒就更改一次 PEERS 是正常的，我应该通过查看它是否为我改变了什么来处理它？编辑：感谢您的快速回答和参考！