DimenManager

/**
 * Manages dimensions (px) via etalon (STANDARD is for Nexus7). 
 * Use for texts, not for pictures
 * (as this one has two scale coefficients: one for width and one for height).
 */

@SuppressLint("UseValueOf")
public class DimenManager {

	private static final Point STANDARD = new Point(1200, 1776);
	private Point now;
	private boolean portrait;

	private static DimenManager instance;

	private DimenManager() {
	}

	public boolean isSetup() {
		return now != null;
	}

	public static DimenManager getInstance() {
		if (instance == null) {
			instance = new DimenManager();
		}
		return instance;
	}

	public DimenManager setup(Context applicationContext) {
		Display display = ((WindowManager) applicationContext
				.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
		DisplayMetrics metrics = new DisplayMetrics();
		display.getMetrics(metrics);

		now = new Point(metrics.widthPixels, metrics.heightPixels);
		portrait = now.x <= now.y;
		if (!portrait) {
			now = new Point(metrics.heightPixels, metrics.widthPixels);
		}

		if (now.x > STANDARD.x || now.y > STANDARD.y) {
			now = STANDARD;
		}

		return this;
	}

	public int getWidth(int width) {
		double theWidth = (double) now.x * width;
		return new Double(theWidth / STANDARD.x).intValue();
	}

	public int getHeight(int height) {
		double theHeight = (double) now.y * height;
		return new Double(theHeight / STANDARD.y).intValue();
	}
        
        /**
         * Text size is calculated from height.
         */
    	public static int getTextSize(int size) {
        	DimenManager manager = DimenManager.getInstance();
        	if (manager.isLoaded()) {
            		return manager.getHeight(size);
        	}
        	return 0;
    	}
        
        /**
         * Set text size of the view if it is textview and new size is positive number.
         */
    	public static void setTextViewSize(View view, int pxSize) {
        	if (view != null && view instanceof TextView && pxSize > 0) {
            		((TextView) view).setTextSize(TypedValue.COMPLEX_UNIT_PX, pxSize);
        	}
    	}
    	
    	/**
    	 * Example of use
    	 */
    	public static void setTextSize(View option) {
        	setTextViewSize(option, getTextSize(56));
    	}

    

}