下面的广播可以打印看看都是
SUPPLICANT_STATE_CHANGED_ACTION
EXTRA_NEW_STATE
EXTRA_SUPPLICANT_ERROR
EXTRA_SUPPLICANT_ERROR_REASON
EXTRA_SUPPLICANT_WIFI_SSID （这个是自定义的）
NETWORK_STATE_CHANGED_ACTION
EXTRA_NETWORK_INFO
EXTRA_BSSID
EXTRA_WIFI_INFO
wpa_supplicant是否连接
SUPPLICANT_CONNECTION_CHANGE_ACTION
EXTRA_SUPPLICANT_CONNECTED
CONFIGURED_NETWORKS_CHANGED_ACTION
EXTRA_WIFI_CONFIGURATION
EXTRA_MULTIPLE_NETWORKS_CHANGED
EXTRA_CHANGE_REASON
CHANGE_REASON_ADDED
CHANGE_REASON_REMOVED
CHANGE_REASON_CONFIG_CHANGE
扫描完成的广播
SCAN_RESULTS_AVAILABLE_ACTION
EXTRA_RESULTS_UPDATED
应该是匹配的扫描结果广播
BATCHED_SCAN_RESULTS_AVAILABLE_ACTION
信号强度
RSSI_CHANGED_ACTION
EXTRA_NEW_RSSI