A Screen Size Utility Class for Android

ScreenSizeUtils.java

/**
 * This class is just a helper package to get the screen dimensions
 */
public class ScreenSizeUtils {

	// helper classes
	private Context mContext;
	private WindowManager mWm;
	private Display mDisplay;
	private Configuration mConfig;
	private DisplayMetrics mDisplayMetrics, mRealDisplayMetrics;
	
	// helper attributes
	private static final int Unknown = -255;
	
	private int width_px, height_px;
	private int width_dp, height_dp;
	
	
	//values
	private String widthxheight_px;
	private String widthxheight_dp;
	
	
	public ScreenSizeUtils(Context mContext) {
		this.mContext = mContext;
		init();
	}
	
	private ScreenSizeUtils init() {
		mWm = ((WindowManager) mContext
			.getSystemService(Context.WINDOW_SERVICE));
		mDisplay = mWm.getDefaultDisplay();
		mConfig = mContext.getResources().getConfiguration();
		mDisplayMetrics = new DisplayMetrics();
		mDisplay.getMetrics(mDisplayMetrics);
		if (Build.VERSION.SDK_INT >= 17) {
			mRealDisplayMetrics = new DisplayMetrics();
			mDisplay.getRealMetrics(mRealDisplayMetrics);
		}
		
		GET_widthxheight_dp();
		return this;
	}
	
	public String GET_widthxheight_px() {
		if (Build.VERSION.SDK_INT < 13) {
			width_px = mDisplay.getWidth();
			height_px = mDisplay.getHeight();
		} else {
			Point mPoint = new Point();
			mDisplay.getSize(mPoint);
			width_px = mPoint.x;
			height_px = mPoint.y;
		}
		widthxheight_px = width_px + " x " + height_px;
		return widthxheight_px;
	}
	
	public String GET_widthxheight_dp() {
		int real_width_px = Unknown;
		int real_height_px = Unknown;
	
		if (Build.VERSION.SDK_INT >= 17) {
			real_width_px = mRealDisplayMetrics.widthPixels;
			real_height_px = mRealDisplayMetrics.heightPixels;
		} else {
			//it is necessary if you haven't called it before
			GET_widthxheight_px();
	    	}
	
		height_dp = (int) (((double) ((real_height_px == Unknown) ? height_px
			: real_height_px) / mDisplayMetrics.density) + 0.5);
	
		if (Build.VERSION.SDK_INT >= 13) {
	        	width_dp = mConfig.screenWidthDp;
	    	} else {
			width_dp = (int) (((double) ((real_width_px == Unknown) ? width_px
                		: real_width_px) / mDisplayMetrics.density) + 0.5);
	    	}
	
	    	widthxheight_dp = width_dp + " x " + height_dp;
	    	return widthxheight_dp;
	}
	
	public int getWidth_px() {
    		return width_px;
	}
	
	public int getHeight_px() {
    		return height_px;
	}
	
	public int getWidth_dp() {
		return width_dp;
	}
	
	public int getHeight_dp() {
	    return height_dp;
	}
}