1.压缩到指定尺寸
//使用Bitmap加Matrix来缩放public static Drawable resizeImage(Bitmap bitmap, int w, int h) { Bitmap BitmapOrg = bitmap; int width = BitmapOrg.getWidth(); int height = BitmapOrg.getHeight(); int newWidth = w; int newHeight = h; float scaleWidth = ((float) newWidth) / width; float scaleHeight = ((float) newHeight) / height; Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // if you want to rotate the Bitmap // matrix.postRotate(45); Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width, height, matrix, true); return new BitmapDrawable(resizedBitmap); }
优缺点分析:
优点 : 能将图片压缩导致定尺寸
缺点:比较耗费内存 要先获取整个图片加载到内存中 初始输入的 Bitmap只能通过BitmapFactory.decodeFile(productPath);
原始图片较大,会费内存
2.按照比例压缩
//使用BitmapFactory.Options的inSampleSize参数来缩放public static Drawable resizeImage2(String path,int width,int height) {BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;//不加载bitmap到内存中BitmapFactory.decodeFile(path,options); int outWidth = options.outWidth;int outHeight = options.outHeight;options.inDither = false;options.inPreferredConfig = Bitmap.Config.ARGB_8888;options.inSampleSize = 1;if (outWidth != 0 && outHeight != 0 && width != 0 && height != 0) {int sampleSize=(outWidth/width+outHeight/height)/2;Log.d(tag, "sampleSize = " + sampleSize);options.inSampleSize = sampleSize;}options.inJustDecodeBounds = false;return new BitmapDrawable(BitmapFactory.decodeFile(path, options));}
优缺点分析:
优点 :比较身内存,开始不需要加载整个图片到内存中.只获取原始图片的宽高就可以了~
缺点:只能按照几分之几压缩
options.inSampleSize
采样率只能是int值,宽高只能压缩到原来的1/2;1/3等等~~
