DensityUtil.java

package com.cheikh.lazywaimai.util;

/*
 * Copyright (c) 2014,KJFrameForAndroid Open Source Project,张涛.
 *
 * 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.
 */

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

/**
 * 系统屏幕的一些操作<br>
 *
 * <b>创建时间</b> 2014-8-14
 *
 * @author kymjs (https://github.com/kymjs)
 * @version 1.1
 */
public final class DensityUtil {

    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     */
    public static int dip2px(Context context, float dpValue) {
        Resources r = context.getResources();
        float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dpValue, r.getDisplayMetrics());
        return (int) px;
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 sp
     */
    public static int px2sp(Context context, float pxValue) {
        float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (pxValue / fontScale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 sp 的单位 转成为 px
     */
    public static int sp2px(Context context, float spValue) {
        float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
        return (int) (spValue * fontScale + 0.5f);
    }

    /**
     * 获取dialog宽度
     */
    public static int getDialogW(Context aty) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = aty.getResources().getDisplayMetrics();
        int w = dm.widthPixels - 100;
        return w;
    }

    /**
     * 获取屏幕宽度
     */
    public static int getScreenW(Context aty) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = aty.getResources().getDisplayMetrics();
        int w = dm.widthPixels;
        return w;
    }

    /**
     * 获取屏幕高度
     */
    public static int getScreenH(Context aty) {
        DisplayMetrics dm = new DisplayMetrics();
        dm = aty.getResources().getDisplayMetrics();
        int h = dm.heightPixels;
        return h;
    }
}