利用canvas和bitmap如何对图片缩放到适应屏幕大小？
| 创建你自己想要大小的 bitmap public static Bitmap resizeBitmap(Bitmap bitmap, int w, int h) { if (bitmap != null) { int width = bitmap.getWidth(); int height = bitmap.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); Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true); return resizedBitmap; } else { return null; } } public static Bitmap resizeBitmap(String path,int width,int height){ BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; options.outWidth = width; options.outHeight = height; Bitmap bmp = BitmapFactory.decodeFile(path, options); options.inSampleSize = options.outWidth / height; options.inJustDecodeBounds = false; bmp = BitmapFactory.decodeFile(path, options); return bmp; } |