Android创建热点

需要用到的权限：

android.Manifest.permission.CHANGE_NETWORK_STATE,
android.Manifest.permission.CHANGE_WIFI_STATE,
android.Manifest.permission.ACCESS_NETWORK_STATE

创建热点

/**
     * 创建Wifi热点
     */
    private void createWifiHotspot() {
        if (wifiManager.isWifiEnabled()) {
            //如果wifi处于打开状态，则关闭wifi,
            wifiManager.setWifiEnabled(false);
        }
        WifiConfiguration config = new WifiConfiguration();
        config.SSID = "大熊测试";
        config.preSharedKey = "123456789";
        config.hiddenSSID = true;
        config.allowedAuthAlgorithms
                .set(WifiConfiguration.AuthAlgorithm.OPEN);//开放系统认证
        config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
        config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
        config.allowedPairwiseCiphers
                .set(WifiConfiguration.PairwiseCipher.TKIP);
        config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
        config.allowedPairwiseCiphers
                .set(WifiConfiguration.PairwiseCipher.CCMP);
        config.status = WifiConfiguration.Status.ENABLED;
        //通过反射调用设置热点
        try {
            Method method = wifiManager.getClass().getMethod(
                    "setWifiApEnabled", WifiConfiguration.class, Boolean.TYPE);
            boolean enable = (Boolean) method.invoke(wifiManager, config, true);
            if (enable) {
                tvStatus.setText("热点已开启 SSID:" + "大熊测试" + " password:123456789");
            } else {
                tvStatus.setText("创建热点失败");
            }
        } catch (Exception e) {
            e.printStackTrace();
            tvStatus.setText("创建热点失败");
        }
    }

关闭热点

 /**
     * 关闭热点
     */
    public void closeWifiAp() {
        if (isWifiApEnabled()) {
            try {
                Method method = wifiManager.getClass().getMethod("getWifiApConfiguration");
                method.setAccessible(true);
                WifiConfiguration config = (WifiConfiguration) method.invoke(wifiManager);
                Method method2 = wifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class);
                method2.invoke(wifiManager, config, false);

            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 检查是否开启Wifi热点
     *
     * @return
     */
    public boolean isWifiApEnabled() {
        try {
            Method method = wifiManager.getClass().getMethod("isWifiApEnabled");
            method.setAccessible(true);
            return (boolean) method.invoke(wifiManager);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return false;
    }

开热点手机获得其他连接手机IP

 /**
     * 开热点手机获得其他连接手机IP的方法
     *
     * @return 其他手机IP 数组列表
     */
    public ArrayList<String> getConnectedIP() {
        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];
                    if (!ip.equalsIgnoreCase("ip")) {
                        connectedIp.add(ip);
                    }
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return connectedIp;
    }

针对Android 6.0以上

Android6.0以上系统需要增加一个权限，手动开启：android.permission.WRITE_SETTINGS权限，不能在代码中动态申请

 if (Build.VERSION.SDK_INT >= 23) {
            checkPermission();
        }

  @TargetApi(23)
    void checkPermission() {
        if (!Settings.System.canWrite(this)) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS,
                    Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, REQUEST_CODE);
        }
    }