Glide计算图片大小完美显示

 final ImageView iv = new ImageView(GlobalApp.getContext());
                                iv.setScaleType(ImageView.ScaleType.FIT_CENTER);

                                final String imgurl = URLInterface.img_url + PicDetailList.get(i).getPicname();
                                Glide.with(GlobalApp.getContext()).load(imgurl).asBitmap().into(new SimpleTarget(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL) {
                                    @Override
                                    public void onResourceReady(Bitmap resource, GlideAnimation glideAnimation) {
                                        int imageWidth = resource.getWidth();
                                        int imageHeight = resource.getHeight();
                                        int height = ScreenUtils.getScreenWidth(GlobalApp.getContext()) * imageHeight / imageWidth;
                                        ViewGroup.LayoutParams para = iv.getLayoutParams();
                                        if (para!=null){
                                            para.height = height;
                                            iv.setLayoutParams(para);
                                        }
                                        Glide.with(GlobalApp.getContext()).load(imgurl).asBitmap().into(iv);
                                    }
                                });
                                ll_picDetailList.addView(iv);

package com.yxk.tjm.tianjiumeng.utils;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;

/**
 * Created by Administrator on 2016/12/22 0022.
 */

public class ScreenUtils {
        private ScreenUtils()
        {
        /* cannot be instantiated */
            throw new UnsupportedOperationException("cannot be instantiated");
        }

        /**
         * 获得屏幕高度
         *
         * @param context
         * @return
         */
    public static int getScreenWidth(Context context)
    {
        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }

    /**
     * 获得屏幕宽度
     *
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context)
    {
        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }

    /**
     * 获得状态栏的高度
     *
     * @param context
     * @return
     */
    public static int getStatusHeight(Context context)
    {

        int statusHeight = -1;
        try
        {
            Class clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                    .get(object).toString());
            statusHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        return statusHeight;
    }

    /**
     * 获取当前屏幕截图，包含状态栏
     *
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithStatusBar(Activity activity)
    {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
        view.destroyDrawingCache();
        return bp;

    }

    /**
     * 获取当前屏幕截图，不包含状态栏
     *
     * @param activity
     * @return
     */
    public static Bitmap snapShotWithoutStatusBar(Activity activity)
    {
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap bmp = view.getDrawingCache();
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;

        int width = getScreenWidth(activity);
        int height = getScreenHeight(activity);
        Bitmap bp = null;
        bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
                - statusBarHeight);
        view.destroyDrawingCache();
        return bp;

    }

}