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Android: EACCES (Permission denied) Writing files in Android system is easy with respect to internal storage, but when it comes to writing in external removable storage it may be a problem after android 4.4 release. Apart from android 6 permission we need to gain permission to write in external removable storage, as it can throw a EACCES (Permission denied) Error even if android.permission.WRITE_EXTERNAL_STORAGE is granted. So the following code will ensure that you can write in External media with the necessary permission apart from android.permission.WRITE_EXTERNAL_STORAGE. Call the following function to open the system dialog to gain access with external removable storage. Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE); startActivityForResult(intent, 42); also the Activity Result Listener as follows: @Override     public void onActivityResult(int requestCode, int resultCode, Intent data) {         if (resultCode == RESULT_OK &&a

The following function will get your job done public String getWifiApIpAddress() {     try {          for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {           NetworkInterface intf = en.nextElement();                 if((intf.getDisplayName().toLowerCase().contains("wlan")||intf.getDisplayName().toLowerCase().contains("ap"))) {                 for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {                     InetAddress inetAddress = enumIpAddr.nextElement();                     if (!inetAddress.isLoopbackAddress()&& (inetAddress.getAddress().length == 4)) {                         return inetAddress.getHostAddress();                     }                 }             }         }     } catch (SocketException ex) { }     return null; } NetworkInterface class represents a Network Interface made up of a n