图片的压缩处理（为了节省服务器带宽）

package com.wzkj.vzone.org.util; import android.annotation.TargetApi; import android.content.ContentUris; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Build; import android.os.Environment; import android.provider.DocumentsContract; import android.provider.MediaStore; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.lang.ref.WeakReference; /** * Tools for handler picture * * @author Ryan.Tang * */ public final class ImageTools { /** * Save image to the SD card * @param photoBitmap * @param photoName * @param path */ public static void savePhotoToSDCard(Bitmap photoBitmap,String path,String photoName){ if (checkSDCardAvailable()) { File photoFile = new File(path , photoName); FileOutputStream fileOutputStream = null; try { fileOutputStream = new FileOutputStream(photoFile); if (photoBitmap != null) { if (photoBitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream)) { fileOutputStream.flush(); } } } catch (Exception e) { photoFile.delete(); e.printStackTrace(); }finally{ try { fileOutputStream.close(); } catch (Exception e) { e.printStackTrace(); } } } } public static void savePhotoToSDCard(Bitmap photoBitmap,String path){ if (checkSDCardAvailable()) { File photoFile = new File(path); FileOutputStream fileOutputStream = null; try { fileOutputStream = new FileOutputStream(photoFile); if (photoBitmap != null) { if (photoBitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream)) { fileOutputStream.flush(); } } } catch (Exception e) { photoFile.delete(); e.printStackTrace(); } finally{ try { fileOutputStream.close(); } catch (Exception e) { e.printStackTrace(); } } } } /** * Check the SD card * @return */ public static boolean checkSDCardAvailable(){ return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); } /** * 根据路径加载bitmap * * @param path * 路径 * @param w * 款 * @param h * 长 * @return */ public static final Bitmap convertToBitmap(String path, int w, int h) { try { BitmapFactory.Options opts = new BitmapFactory.Options(); // 设置为ture只获取图片大小 opts.inJustDecodeBounds = true; opts.inPreferredConfig = Bitmap.Config.ARGB_8888; // 返回为空 BitmapFactory.decodeFile(path, opts); int width = opts.outWidth; int height = opts.outHeight; float scaleWidth = 0.f, scaleHeight = 0.f; if (width > w || height > h) { // 缩放 scaleWidth = ((float) width) / w; scaleHeight = ((float) height) / h; } opts.inJustDecodeBounds = false; float scale = Math.max(scaleWidth, scaleHeight); opts.inSampleSize = (int) scale; WeakReference<Bitmap> weak = new WeakReference<Bitmap>(BitmapFactory.decodeFile(path, opts)); Bitmap bMapRotate = Bitmap.createBitmap(weak.get(), 0, 0, weak.get().getWidth(), weak.get().getHeight(), null, true); if (bMapRotate != null) { return bMapRotate; } return null; } catch (Exception e) { e.printStackTrace(); return null; } } @TargetApi(Build.VERSION_CODES.KITKAT) public static String getPath(final Context context, final Uri uri) { final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) { // ExternalStorageProvider if (isExternalStorageDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } // TODO handle non-primary volumes } // DownloadsProvider else if (isDownloadsDocument(uri)) { final String id = DocumentsContract.getDocumentId(uri); final Uri contentUri = ContentUris.withAppendedId( Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } // MediaProvider else if (isMediaDocument(uri)) { final String docId = DocumentsContract.getDocumentId(uri); final String[] split = docId.split(":"); final String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } final String selection = MediaStore.MediaColumns._ID + "=?"; final String[] selectionArgs = new String[] { split[1] }; return getDataColumn(context, contentUri, selection, selectionArgs); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(uri.getScheme())) { // Return the remote address if (isGooglePhotosUri(uri)) return uri.getLastPathSegment(); return getDataColumn(context, uri, null, null); } // File else if ("file".equalsIgnoreCase(uri.getScheme())) { return uri.getPath(); } return null; } /** * Get the value of the data column for this Uri . This is useful for * MediaStore Uris , and other file - based ContentProviders. * * @param context * The context. * @param uri * The Uri to query. * @param selection * (Optional) Filter used in the query. * @param selectionArgs * (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; final String column = MediaStore.MediaColumns.DATA; final String[] projection = { column }; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { final int index = cursor.getColumnIndexOrThrow(column); return cursor.getString(index); } } finally { if (cursor != null) cursor.close(); } return null; } /** * @param uri * The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri .getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri .getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri .getAuthority()); } /** * @param uri * The Uri to check. * @return Whether the Uri authority is Google Photos. */ public static boolean isGooglePhotosUri(Uri uri) { return "com.google.android.apps.photos.content".equals(uri .getAuthority()); } /** * @param url * @return */ public static Bitmap getLoacalBitmap(String url) { try { FileInputStream fis = new FileInputStream(url); return BitmapFactory.decodeStream(fis); } catch (FileNotFoundException e) { e.printStackTrace(); return null; } } //==============================压缩图片开始=========================== /** * Get bitmap from specified image path * * @param imgPath * @return */ public static Bitmap getBitmap(String imgPath) { // Get bitmap through image path BitmapFactory.Options newOpts = new BitmapFactory.Options(); newOpts.inJustDecodeBounds = false; newOpts.inPurgeable = true; newOpts.inInputShareable = true; // Do not compress newOpts.inSampleSize = 1; newOpts.inPreferredConfig = Bitmap.Config.RGB_565; return BitmapFactory.decodeFile(imgPath, newOpts); } /** * Store bitmap into specified image path * * @param bitmap * @param outPath * @throws FileNotFoundException */ public static void storeImage(Bitmap bitmap, String outPath) throws FileNotFoundException { FileOutputStream os = new FileOutputStream(outPath); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os); } /** * Compress image by pixel, this will modify image width/height. * Used to get thumbnail * * @param imgPath image path * @param pixelW target pixel of width * @param pixelH target pixel of height * @return */ public Bitmap ratio(String imgPath, float pixelW, float pixelH) { BitmapFactory.Options newOpts = new BitmapFactory.Options(); // 开始读入图片，此时把options.inJustDecodeBounds 设回true，即只读边不读内容 newOpts.inJustDecodeBounds = true; newOpts.inPreferredConfig = Bitmap.Config.RGB_565; // Get bitmap info, but notice that bitmap is null now Bitmap bitmap = BitmapFactory.decodeFile(imgPath,newOpts); newOpts.inJustDecodeBounds = false; int w = newOpts.outWidth; int h = newOpts.outHeight; // 想要缩放的目标尺寸 float hh = pixelH;// 设置高度为240f时，可以明显看到图片缩小了 float ww = pixelW;// 设置宽度为120f，可以明显看到图片缩小了 // 缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可 int be = 1;//be=1表示不缩放 if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放 be = (int) (newOpts.outWidth / ww); } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放 be = (int) (newOpts.outHeight / hh); } if (be <= 0) be = 1; newOpts.inSampleSize = be;//设置缩放比例 // 开始压缩图片，注意此时已经把options.inJustDecodeBounds 设回false了 bitmap = BitmapFactory.decodeFile(imgPath, newOpts); // 压缩好比例大小后再进行质量压缩 // return compress(bitmap, maxSize); // 这里再进行质量压缩的意义不大，反而耗资源，删除 return bitmap; } /** * Compress image by size, this will modify image width/height. * Used to get thumbnail * * @param image * @param pixelW target pixel of width * @param pixelH target pixel of height * @return */ public static Bitmap ratio(Bitmap image, float pixelW, float pixelH) { ByteArrayOutputStream os = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 100, os); if( os.toByteArray().length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出 os.reset();//重置baos即清空baos image.compress(Bitmap.CompressFormat.JPEG, 50, os);//这里压缩50%，把压缩后的数据存放到baos中 } ByteArrayInputStream is = new ByteArrayInputStream(os.toByteArray()); BitmapFactory.Options newOpts = new BitmapFactory.Options(); //开始读入图片，此时把options.inJustDecodeBounds 设回true了 newOpts.inJustDecodeBounds = true; newOpts.inPreferredConfig = Bitmap.Config.RGB_565; Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts); newOpts.inJustDecodeBounds = false; int w = newOpts.outWidth; int h = newOpts.outHeight; float hh = pixelH;// 设置高度为240f时，可以明显看到图片缩小了 float ww = pixelW;// 设置宽度为120f，可以明显看到图片缩小了 //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可 int be = 1;//be=1表示不缩放 if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放 be = (int) (newOpts.outWidth / ww); } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放 be = (int) (newOpts.outHeight / hh); } if (be <= 0) be = 1; newOpts.inSampleSize = be;//设置缩放比例 //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了 is = new ByteArrayInputStream(os.toByteArray()); bitmap = BitmapFactory.decodeStream(is, null, newOpts); //压缩好比例大小后再进行质量压缩 // return compress(bitmap, maxSize); // 这里再进行质量压缩的意义不大，反而耗资源，删除 return bitmap; } /** * Compress by quality, and generate image to the path specified * * @param image * @param outPath * @param maxSize target will be compressed to be smaller than this size.(kb) * @throws IOException */ public static void compressAndGenImage(Bitmap image, String outPath, int maxSize) throws IOException { ByteArrayOutputStream os = new ByteArrayOutputStream(); // scale int options = 100; // Store the bitmap into output stream(no compress) image.compress(Bitmap.CompressFormat.PNG, options, os); // Compress by loop while ( os.toByteArray().length / 1024 > maxSize) { // Clean up os os.reset(); // interval 10 options -= 10; image.compress(Bitmap.CompressFormat.PNG, options, os); } // Generate compressed image file FileOutputStream fos = new FileOutputStream(outPath); fos.write(os.toByteArray()); fos.flush(); fos.close(); } /** * Compress by quality, and generate image to the path specified * * @param imgPath * @param outPath * @param maxSize target will be compressed to be smaller than this size.(kb) * @param needsDelete Whether delete original file after compress * @throws IOException */ public void compressAndGenImage(String imgPath, String outPath, int maxSize, boolean needsDelete) throws IOException { compressAndGenImage(getBitmap(imgPath), outPath, maxSize); // Delete original file if (needsDelete) { File file = new File (imgPath); if (file.exists()) { file.delete(); } } } /** * Ratio and generate thumb to the path specified * * @param image * @param outPath * @param pixelW target pixel of width * @param pixelH target pixel of height * @throws FileNotFoundException */ public static void ratioAndGenThumb(Bitmap image, String outPath, float pixelW, float pixelH) throws FileNotFoundException { Bitmap bitmap = ratio(image, pixelW, pixelH); storeImage( bitmap, outPath); } /** * Ratio and generate thumb to the path specified * * @param outPath * @param pixelW target pixel of width * @param pixelH target pixel of height * @param needsDelete Whether delete original file after compress * @throws FileNotFoundException */ public void ratioAndGenThumb(String imgPath, String outPath, float pixelW, float pixelH, boolean needsDelete) throws FileNotFoundException { Bitmap bitmap = ratio(imgPath, pixelW, pixelH); storeImage( bitmap, outPath); // Delete original file if (needsDelete) { File file = new File (imgPath); if (file.exists()) { file.delete(); } } } public static void compressBmpToFile(Bitmap bmp,File file){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); int options = 80;//个人喜欢从80开始, bmp.compress(Bitmap.CompressFormat.JPEG, options, baos); while (baos.toByteArray().length / 1024 > 100) { baos.reset(); options -= 10; bmp.compress(Bitmap.CompressFormat.JPEG, options, baos); } try { FileOutputStream fos = new FileOutputStream(file); fos.write(baos.toByteArray()); fos.flush(); fos.close(); } catch (Exception e) { e.printStackTrace(); } } private Bitmap compressImageFromFile(String srcPath) { BitmapFactory.Options newOpts = new BitmapFactory.Options(); newOpts.inJustDecodeBounds = true;//只读边,不读内容 Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts); newOpts.inJustDecodeBounds = false; int w = newOpts.outWidth; int h = newOpts.outHeight; float hh = 800f;// float ww = 480f;// int be = 1; if (w > h && w > ww) { be = (int) (newOpts.outWidth / ww); } else if (w < h && h > hh) { be = (int) (newOpts.outHeight / hh); } if (be <= 0) be = 1; newOpts.inSampleSize = be;//设置采样率 newOpts.inPreferredConfig = Bitmap.Config.ARGB_8888;//该模式是默认的,可不设 newOpts.inPurgeable = true;// 同时设置才会有效 newOpts.inInputShareable = true;//。当系统内存不够时候图片自动被回收 bitmap = BitmapFactory.decodeFile(srcPath, newOpts); // return compressBmpFromBmp(bitmap);//原来的方法调用了这个方法企图进行二次压缩 //其实是无效的,大家尽管尝试 return bitmap; } private Bitmap compressBmpFromBmp(Bitmap image) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); int options = 100; image.compress(Bitmap.CompressFormat.JPEG, 100, baos); while (baos.toByteArray().length / 1024 > 100) { baos.reset(); options -= 10; image.compress(Bitmap.CompressFormat.JPEG, options, baos); } ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null); return bitmap; } //=====================================图片压缩结束====================== }