ConvertDpPx.java

package com.zulip.android.util;

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

/**
 * This class is used during conversions between dp and px.
 */

public class ConvertDpPx {

    /**
     * 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
     * @return A float value to represent px equivalent to dp depending on device density
     */
    public static int convertDpToPixel(float dp) {
        DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
        float px = dp * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);
        return Math.round(px);
    }

    /**
     * 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
     * @return A float value to represent dp equivalent to px value
     */
    public static float convertPixelsToDp(float px) {
        DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
        float dp = px / ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);
        return dp;
    }
}