import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Environment; import android.text.TextUtils; import android.util.Log; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import utils.ImageRotateUtil; /** * Created by pengkv on 15/12/2. * 图片压缩工具类 */ public class ImageCompressUtil { private static List<String> mImageList = new ArrayList<>();// 临时图片集合 private static String mImagePath = ""; // 单个临时图片 public static String cachePath = ""; public static int reqWidth = 320; public static int reqHeight = 480; //压缩单张图片方法 public static void compressImage(final Context ctx, final String filePath, final ProcessImgCallBack callBack) { mImagePath = "";//清空路径 new Thread(new Runnable() { @Override public void run() { //如果路径是图片，则进行压缩 if (isImage(filePath)) { mImagePath = compress(ctx, filePath); } callBack.compressSuccess(mImagePath); } }).start(); } //压缩图片集合方法 public static void compressImageList(final Context ctx, final List<String> fileList, final ProcessImgListCallBack callBack) { mImageList.clear();//清空集合 if (fileList == null || fileList.isEmpty()) { callBack.compressSuccess(mImageList); return; } new Thread(new Runnable() { @Override public void run() { String tempPath = ""; for (String imagePath : fileList) { if (isImage(imagePath)) { tempPath = compress(ctx, imagePath); mImageList.add(tempPath); } } callBack.compressSuccess(mImageList); } }).start(); } //图片压缩的方法 public static String compress(Context ctx, String filePath) { if (TextUtils.isEmpty(filePath)) return filePath; File file = new File(filePath); if (!file.exists())//判断路径是否存在 return filePath; if (file.length() < 1)//文件是否为空 return null; File tempFile = getDiskCacheDir(ctx); String outImagePath = tempFile.getAbsolutePath(); // 输出图片文件路径 int degree = ImageRotateUtil.getBitmapDegree(filePath); // 检查图片的旋转角度 //谷歌官网压缩图片 final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(filePath, options); options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); options.inJustDecodeBounds = false; Bitmap bitmap = BitmapFactory.decodeFile(filePath, options); // 旋转:这步处理主要是为了处理三星手机拍的照片 if (degree > 0) { bitmap = ImageRotateUtil.rotateBitmapByDegree(bitmap, degree); } // 写入文件 FileOutputStream fos; try { fos = new FileOutputStream(tempFile); bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos); fos.flush(); fos.close(); bitmap.recycle(); } catch (FileNotFoundException e) { e.printStackTrace(); return filePath; } catch (Exception e) { e.printStackTrace(); return filePath; } return outImagePath; } /** * 计算压缩比例值 * 按照2、3、4...倍压缩 * * @param options 解析图片的配置信息 * @param reqWidth 所需图片压缩尺寸最小宽度 * @param reqHeight 所需图片压缩尺寸最小高度 * @return */ public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { final int picheight = options.outHeight; final int picwidth = options.outWidth; Log.i("--->", "原尺寸:" + picwidth + "*" + picheight); int targetheight = picheight; int targetwidth = picwidth; int inSampleSize = 1; if (targetheight > reqHeight || targetwidth > reqWidth) { while (targetheight >= reqHeight && targetwidth >= reqWidth) { inSampleSize += 1; targetheight = picheight / inSampleSize; targetwidth = picwidth / inSampleSize; } } Log.i("--->", "最终压缩比例:" + inSampleSize + "倍/新尺寸:" + targetwidth + "*" + targetheight); return inSampleSize; } //图片集合压缩成功后的回调接口 public interface ProcessImgListCallBack { void compressSuccess(List<String> imgList); } //单张图片压缩成功后的回调接口 public interface ProcessImgCallBack { void compressSuccess(String imgPath); } /** * 获取文件后缀名 * * @param fileName * @return 文件后缀名 */ public static String getFileType(String fileName) { if (!TextUtils.isEmpty(fileName)) { int typeIndex = fileName.lastIndexOf("."); if (typeIndex != -1) { String fileType = fileName.substring(typeIndex + 1).toLowerCase(); return fileType; } } return ""; } /** * 判断是否是图片 * * @param fileName * @return 是否是图片类型 */ public static boolean isImage(String fileName) { String type = getFileType(fileName); if (!TextUtils.isEmpty(type) && (type.equals("jpg") || type.equals("gif") || type.equals("png") || type.equals("jpeg") || type.equals("bmp") || type.equals("wbmp") || type.equals("ico") || type.equals("jpe"))) { return true; } return false; } /** * 将压缩后的图片存储在缓存中 */ public static File getDiskCacheDir(Context ctx) { if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) || !Environment.isExternalStorageRemovable()) { cachePath = ctx.getExternalCacheDir().getPath(); } else { cachePath = ctx.getCacheDir().getPath(); } String uniqueName = System.currentTimeMillis() + "_tmp.jpg"; return new File(cachePath + File.separator + uniqueName); } /** * 清理缓存文件夹 */ public static void clearCache(Context ctx) { File file = new File(cachePath); File[] childFile = file.listFiles(); if (childFile == null || childFile.length == 0) { return; } for (File f : childFile) { f.delete(); // 循环删除子文件 } } /** * 从图片路径读取出图片 * * @param imagePath * @return */ private Bitmap decodeFile(String imagePath) { Bitmap bitmap = null; try { File file = new File(imagePath); BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = false; FileInputStream fis = new FileInputStream(file); bitmap = BitmapFactory.decodeStream(fis, null, options); fis.close(); } catch (IOException e) { e.printStackTrace(); } return bitmap; } }
