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copied!<pre><code>public static Bitmap transform(Matrix scaler, Bitmap source, int targetWidth, int targetHeight, boolean scaleUp) { int deltaX = source.getWidth() - targetWidth; int deltaY = source.getHeight() - targetHeight; if (!scaleUp && (deltaX < 0 || deltaY < 0)) { /* * In this case the bitmap is smaller, at least in one dimension, * than the target. Transform it by placing as much of the image as * possible into the target and leaving the top/bottom or left/right * (or both) black. */ Bitmap b2 = Bitmap.createBitmap(targetWidth, targetHeight, Bitmap.Config.ARGB_8888); Canvas c = new Canvas(b2); int deltaXHalf = Math.max(0, deltaX / 2); int deltaYHalf = Math.max(0, deltaY / 2); Rect src = new Rect(deltaXHalf, deltaYHalf, deltaXHalf + Math.min(targetWidth, source.getWidth()), deltaYHalf + Math.min(targetHeight, source.getHeight())); int dstX = (targetWidth - src.width()) / 2; int dstY = (targetHeight - src.height()) / 2; Rect dst = new Rect(dstX, dstY, targetWidth - dstX, targetHeight - dstY); c.drawBitmap(source, src, dst, null); return b2; } float bitmapWidthF = source.getWidth(); float bitmapHeightF = source.getHeight(); float bitmapAspect = bitmapWidthF / bitmapHeightF; float viewAspect = (float) targetWidth / targetHeight; if (bitmapAspect > viewAspect) { float scale = targetHeight / bitmapHeightF; if (scale < .9F || scale > 1F) { scaler.setScale(scale, scale); } else { scaler = null; } } else { float scale = targetWidth / bitmapWidthF; if (scale < .9F || scale > 1F) { scaler.setScale(scale, scale); } else { scaler = null; } } Bitmap b1; if (scaler != null) { // this is used for minithumb and crop, so we want to filter here. b1 = Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), scaler, true); } else { b1 = source; } int dx1 = Math.max(0, b1.getWidth() - targetWidth); int dy1 = Math.max(0, b1.getHeight() - targetHeight); Bitmap b2 = Bitmap.createBitmap(b1, dx1 / 2, dy1 / 2, targetWidth, targetHeight); if (b1 != source) { b1.recycle(); } return b2; } </code></pre>

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