图片压缩

package com.shaodianbao.util;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.media.ExifInterface;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;/** * Created by Administrator on 2017/4/7 0007. * 对图片的处理 */public class ImageUtil {    /**     * 图片的压缩（尺寸压缩和质量压缩）     *     * @param srcPath   源文件的路径     * @param desPath   压缩后的保存路径     * @param maxWidth  最大的高度     * @param maxHeight 最大的宽度     * @param quality   不压缩百分比（quality表示不压缩的量 100表示不压缩）     * @throws IOException     */    public static void compressPicture(String srcPath, String desPath, int maxWidth, int maxHeight, int quality) {        try {            BitmapFactory.Options opts = new BitmapFactory.Options();            //开始读入图片，此时把options.inJustDecodeBounds 设回true了            opts.inJustDecodeBounds = true;            BitmapFactory.decodeFile(srcPath, opts);            int w = opts.outWidth;            int h = opts.outHeight;            int inSampleSize = 1;            if (w > h && w > maxWidth) {                inSampleSize = w / maxWidth;            } else if (w < h && h > maxHeight) {                inSampleSize = h / maxHeight;            }            opts.inSampleSize = inSampleSize;            opts.inJustDecodeBounds = false;            Bitmap bm = BitmapFactory.decodeFile(srcPath, opts);            OutputStream out = new FileOutputStream(desPath);            bm.compress(Bitmap.CompressFormat.JPEG, quality, out);            out.close();            bm.recycle();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 缩放图片     *     * @param srcPath   原路径     * @param desPath   缩放后的保存路径     * @param newWidth  缩放后的宽度     * @param newHeight 缩放后的高度     */    public static void zoomImage(String srcPath, String desPath, int newWidth, int newHeight) {        try {            Bitmap bitmap = BitmapFactory.decodeFile(srcPath);            //获取这个图片的宽和高            float width = bitmap.getWidth();            float height = bitmap.getHeight();            //计算宽高缩放率            float scaleWidth = newWidth / width;            float scaleHeight = newHeight / height;            //创建操作图片用的matrix            Matrix matrix = new Matrix();            //缩放图片动作            matrix.postScale(scaleWidth, scaleHeight);            Bitmap bm = Bitmap.createBitmap(bitmap, 0, 0, (int) width, (int) height, matrix, true);            FileOutputStream out = new FileOutputStream(desPath);            bm.compress(Bitmap.CompressFormat.JPEG, 100, out);        } catch (FileNotFoundException e) {            e.printStackTrace();        }    }}
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