DensityUtils.java

/*
 * Copyright (c) 2015 [1076559197@qq.com | tchen0707@gmail.com]
 *
 * 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.dreamspace.uucampus.common.utils;

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

public class DensityUtils {

    private static final float DOT_FIVE = 0.5f;


    /**
     * dip to px
     *
     * @param context
     * @param dip
     * @return
     */
    public static int dip2px(Context context, float dip) {
        float density = getDensity(context);
        return (int) (dip * density + DensityUtils.DOT_FIVE);
    }

    /**
     * px to dip
     *
     * @param context
     * @param px
     * @return
     */
    public static int px2dip(Context context, float px) {
        float density = getDensity(context);
        return (int) (px / density + DOT_FIVE);
    }

    private static DisplayMetrics sDisplayMetrics;

    /**
     * get screen width
     *
     * @param context
     * @return
     */
    public static int getDisplayWidth(Context context) {
        initDisplayMetrics(context);
        return sDisplayMetrics.widthPixels;
    }

    /**
     * get screen height
     *
     * @param context
     * @return
     */
    public static int getDisplayHeight(Context context) {
        initDisplayMetrics(context);
        return sDisplayMetrics.heightPixels;
    }

    /**
     * get screen density
     *
     * @param context
     * @return
     */
    public static float getDensity(Context context) {
        initDisplayMetrics(context);
        return sDisplayMetrics.density;
    }


    /**
     * get screen density dpi
     *
     * @param context
     * @return
     */
    public static int getDensityDpi(Context context) {
        initDisplayMetrics(context);
        return sDisplayMetrics.densityDpi;
    }

    /**
     * init display metrics
     *
     * @param context
     */
    private static synchronized void initDisplayMetrics(Context context) {
        sDisplayMetrics = context.getResources().getDisplayMetrics();
    }

    /**
     * is landscape
     *
     * @param context
     * @return
     */
    public static boolean isLandscape(Context context) {
        return context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;
    }

    /**
     * is portrait
     *
     * @param context
     * @return
     */
    public static boolean isPortrait(Context context) {
        return context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;
    }
}