android wifi AsyncChannel（WifiManager和WifiP2pManager）
AynscChannel的讲解
[Android]AsyncChannel介绍-CSDN博客
WifiP2pManager里的channel的使用理解
WifiP2pManager.java
public void createGroup(Channel c, ActionListener listener) {checkChannel(c);c.mAsyncChannel.sendMessage(CREATE_GROUP, WifiP2pGroup.NETWORK_ID_PERSISTENT,c.putListener(listener));
}
这里面的c变量是Channel， c.putListener按理说Channel里有putListener方法一开始以为Channel是android 里的工具类接口，结果发现WifiP2pManager里有这个Channel的定义
里面还有个P2pHandle，解析各种信息，调用不同的回调，可以看出来这儿不止有ActionListener回调，还有P2pStateListener、ConnectionInfoListener等
class WifiP2pManager {
public static class Channel implements AutoCloseable {public Channel(Context context, Looper looper, ChannelListener l, Binder binder,WifiP2pManager p2pManager) {mAsyncChannel = new AsyncChannel();mHandler = new P2pHandler(looper);}class P2pHandler extends Handler {public void handleMessage(Message message) {case DISCOVER_PEERS_FAILED:case STOP_DISCOVERY_FAILED:case DISCOVER_SERVICES_FAILED:case CONNECT_FAILED:case CANCEL_CONNECT_FAILED:case CREATE_GROUP_FAILED:case REMOVE_GROUP_FAILED:((ActionListener) listener).onFailure(message.arg1);break;case CREATE_GROUP_SUCCEEDED:case REMOVE_GROUP_SUCCEEDED:((ActionListener) listener).onSuccess();case RESPONSE_P2P_STATE:((P2pStateListener) listener).onP2pStateAvailable(message.arg1);case RESPONSE_CONNECTION_INFO:((ConnectionInfoListener)listener).onConnectionInfoAvailable(wifiP2pInfo);}}private int putListener(Object listener) {int key;key = mListenerKey++;mListenerMap.put(key, listener);}return key;}
}
}