UnitConverter.java

package example.base.util;

import android.content.Context;
import android.content.res.Resources;
import android.util.DisplayMetrics;

/**
 * Created by Silver on 6/7/15.
 */
public class UnitConverter {
    /**
     * This method converts dp unit to equivalent pixels, depending on device density.
     *
     * @param dp A value in dp (density independent pixels) unit. Which we need to convert into pixels
     * @param context Context to get resources and device specific display metrics
     * @return A float value to represent px equivalent to dp depending on device density
     */
    public static int convertDpToPixel(float dp, Context context){
        Resources resources = context.getResources();
        DisplayMetrics metrics = resources.getDisplayMetrics();
        return (int) (dp * (metrics.densityDpi / 160));
    }

    /**
     * This method converts device specific pixels to density independent pixels.
     *
     * @param px A value in px (pixels) unit. Which we need to convert into db
     * @param context Context to get resources and device specific display metrics
     * @return A float value to represent dp equivalent to px value
     */
    public static float convertPixelsToDp(float px, Context context){
        Resources resources = context.getResources();
        DisplayMetrics metrics = resources.getDisplayMetrics();
        return px / (metrics.densityDpi / 160f);
    }
}