How to check SD card availability in android devices.

The following method returns true if your device is mounted with the SD card else returns false:

      public static boolean isSdCardPresent() {

return android.os.Environment.getExternalStorageState().equals(

android.os.Environment.MEDIA_MOUNTED);

}

How to check internet connection in android

The below method helps you to find out whether your device is connected with any kind of network :

public boolean isOnline(Context context) {

ConnectivityManager cm = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo netInfo = cm.getActiveNetworkInfo();

if (netInfo != null && netInfo.isConnectedOrConnecting()) {

return true;

}

return false;

}

  The above function returns true if the device has been connected with the internet else return false.