WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
if (!wifiManager.isWifiEnabled()) {
System.out.println("=================");
wifiManager.setWifiEnabled(true);
}
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
String IPAddress = intToIp(wifiInfo.getIpAddress());
System.out.println("IPAddress-->>" + IPAddress);
DhcpInfo dhcpinfo = wifiManager.getDhcpInfo();
String serverAddress = intToIp(dhcpinfo.serverAddress);
System.out.println("serverAddress-->>" + serverAddress);
其中IPAddress 是本機的IP地址,serverAddress 是你所連接的wifi熱點對應的IP地址
if (!wifiManager.isWifiEnabled()) {
System.out.println("=================");
wifiManager.setWifiEnabled(true);
}
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
String IPAddress = intToIp(wifiInfo.getIpAddress());
System.out.println("IPAddress-->>" + IPAddress);
DhcpInfo dhcpinfo = wifiManager.getDhcpInfo();
String serverAddress = intToIp(dhcpinfo.serverAddress);
System.out.println("serverAddress-->>" + serverAddress);
其中IPAddress 是本機的IP地址,serverAddress 是你所連接的wifi熱點對應的IP地址
private String intToIp(int paramInt)
{
return (paramInt & 0xFF) + "." + (0xFF & paramInt >> 8) + "." + (0xFF & paramInt >> 16) + "."
+ (0xFF & paramInt >> 24);
}
當在Android設備終端上使用Wifi熱點的時候,需要獲知Wifi熱點的運行狀態,熱點是否打開,連接到該WIFI熱點的設備數量,以及連接設備的具體IP和MAC地址。
使用re文件管理器去"/proc/net/arp",打開,發現連接上熱點的設備信息都在這里了,包括mac ip等。
鑒於此,我們可以在代碼中打開該文件,並獲取WIFI熱點的信息。
獲取WIFI熱點狀態的方法getWifiApState()和判斷熱點是否可用的方法isApEnabled(),在Android源碼WifiManager.Java中已經實現,但是它們是Hide方法,在SDK層面是不能訪問的,如要訪問需要用到java反射的機制。具體代碼實現如下:
其中定義WIFI AP的幾個狀態
- public static final int WIFI_AP_STATE_DISABLING = 10;
- public static final int WIFI_AP_STATE_DISABLED = 11;
- public static final int WIFI_AP_STATE_ENABLING = 12;
- public static final int WIFI_AP_STATE_ENABLED = 13;
- public static final int WIFI_AP_STATE_FAILED = 14;
對應於WifiMangaer.java中對這幾個狀態的定義。
獲取WIFI熱點的狀態:
- public int getWifiApState(Context mContext) {
- WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
- try {
- Method method = wifiManager.getClass().getMethod("getWifiApState");
- int i = (Integer) method.invoke(wifiManager);
- Log.i(TAG,"wifi state: " + i);
- return i;
- } catch (Exception e) {
- Log.e(TAG,"Cannot get WiFi AP state" + e);
- return WIFI_AP_STATE_FAILED;
- }
- }
判斷Wifi熱點是否可用:
- public boolean isApEnabled(Context mContext) {
- int state = getWifiApState(mContext);
- return WIFI_AP_STATE_ENABLING == state || WIFI_AP_STATE_ENABLED == state;
- }
獲取鏈接到當前熱點的設備IP:
- private ArrayList<String> getConnectedHotIP() {
- ArrayList<String> connectedIP = new ArrayList<String>();
- try {
- BufferedReader br = new BufferedReader(new FileReader(
- "/proc/net/arp"));
- String line;
- while ((line = br.readLine()) != null) {
- String[] splitted = line.split(" +");
- if (splitted != null && splitted.length >= 4) {
- String ip = splitted[0];
- connectedIP.add(ip);
- }
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- return connectedIP;
- }
- //輸出鏈接到當前設備的IP地址
- public void printHotIp() {
- ArrayList<String> connectedIP = getConnectedHotIP();
- StringBuilder resultList = new StringBuilder();
- for (String ip : connectedIP) {
- resultList.append(ip);
- resultList.append("\n");
- }
- System.out.print(resultList);
- Log.d(TAG,"---->>heww resultList="+resultList);
- }
當然在應用中要添加訪問WIFI設備的權限:
- <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
否則將會提示如下錯誤:
Cannot get WiFi AP state