Android snippet

deviceID.java

/**
     * get device id, if not available get Build.SERIAL.
     * http://stackoverflow.com/questions/16078269/android-unique-serial-number
     * @param context
     * @return a string indicate a unique device
     */
    public static String getDeviceID(final Context context) {
        final String deviceID = ((TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE)).getDeviceId();
        if (deviceID != null)
            return deviceID;
        else
            return Build.SERIAL;
    }

DPToPX.java

TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, mContext.getResources().getDisplayMetrics());

drawableToBitmap.java

public class BitmapUtils {
    public static Bitmap drawableToBitmap(final Drawable d) {
        if (d instanceof BitmapDrawable)
            return ((BitmapDrawable) d).getBitmap();
        if (d instanceof ColorDrawable) //TODO: working to support color drawable
            return null;
        final Bitmap bitmap = Bitmap.createBitmap(d.getIntrinsicWidth(), d.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        d.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        d.draw(canvas);
        return bitmap;
    }
}