Android打開WIFI、關閉WIFI、檢測目前WIFI狀态

開啟WIFI：

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        WifiManager wifi =(WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        wifi.setWifiEnabled(true);
    }
});      

關閉WIFI：

button2.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        WifiManager wifi = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        wifi.setWifiEnabled(false);
    }
});      

獲得WIFI狀态：

button3.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        WifiManager wifi = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        int wifiState = wifi.getWifiState();
        Toast.makeText(mContext, "狀态是"+wifiState, Toast.LENGTH_SHORT).show();
    }
});      

最後記得要在注冊檔案中加上權限

<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>