DensityUtils.java

/*
 * Copyright (C) 2015 Ticketmaster
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ticketmaster.servos.util;

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

public final class DensityUtils {

    private DensityUtils() { }

    /**
     * Converts the given amount of pixels to a dp value.
     * @param pixels The pixel-based measurement
     * @return The measurement's value in dp, based on the device's screen density
     */
    public static float pxToDp(float pixels) {
        DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
        return pixels / (metrics.densityDpi / 160f);
    }

    /**
     * Converts the given dp measurement to pixels.
     * @param dp The measurement, in dp
     * @return The corresponding amount of pixels based on the device's screen density
     */
    public static float dpToPx(float dp) {
        DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
        return dp * (metrics.densityDpi / 160f);
    }
}