//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); } |
| 1234567891011121314151617181920212223 | //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)); } |
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