/** * 縮放擷取寬度固定高度正中部分後的點陣圖。 * * @param bitmap 原圖 */ public static Bitmap centerRectangleBitmap(Bitmap bitmap) { final int edgeWidth = (int) (App.screenWidth - 26 * App.mDensity) / 2;//view的寬度是螢幕寬度的一半 final int edgeLength = (int) (edgeWidth / 1.5);//view的高度是寬度的2/3 if (null == bitmap || edgeLength <= 0) { return null; } Bitmap result = bitmap; int widthOrg = bitmap.getWidth(); int heightOrg = bitmap.getHeight(); // 壓縮到一個最小長度是edgeLength的bitmap int longerEdge = (int) (edgeWidth * Math.max(widthOrg, heightOrg) / Math .min(widthOrg, heightOrg)); int scaledWidth = widthOrg >= heightOrg ? longerEdge : edgeWidth; Bitmap scaledBitmap = null; try { scaledBitmap = Bitmap.createScaledBitmap(bitmap, scaledWidth, scaledWidth, true); } catch (Exception e) { return null; } if (heightOrg >= edgeLength) { // 從圖中擷取正中間的高。 int yTopLeft = (scaledWidth - edgeLength) / 2; try { if (scaledBitmap != null) { result = Bitmap.createBitmap(scaledBitmap, 0, yTopLeft, scaledWidth, edgeLength); scaledBitmap.recycle(); } } catch (Exception e) { return null; } } return result; } 注：需配合android:scaleType="centerCrop"