场景:从网络上下载下来的小图片,直接使用设置某些区域的大小的时候,会使得图片变形。这个时候,最佳的解决方案是,在图片的清晰度可以容忍的情况下,将图片进行拉升放大处理,处理过程如下:
Bitmap originalBitmap = originalBitmap1; int bw = originalBitmap.getWidth(); int bh = originalBitmap.getHeight(); float scaleWidth = expectedWidth*1.0F / bw; float scaleHeight = expectedHeight*1.0F / bh; //取伸缩小的值 float scale = scaleHeight < scaleWidth ? scaleHeight : scaleWidth; Matrix matrix = new Matrix(); matrix.postScale(scale, scale); Bitmap resizedBitmap = Bitmap.createBitmap(originalBitmap, 0, 0, bw, bh, matrix, true); // 绘制背景图片 Bitmap mBitmap = Bitmap.createBitmap(expectedWidth, expectedHeight, Bitmap.Config.RGB_565); Canvas mCanvas = new Canvas(mBitmap); Paint bitmapPaint = new Paint(Paint.FILTER_BITMAP_FLAG); // 设定背景颜色 mCanvas.drawColor(0xff000000); float left = expectedWidth / 2 - bw * scale / 2; float top = expectedHeight / 2 - bh * scale / 2; mCanvas.drawBitmap(resizedBitmap,left ,top , bitmapPaint); mCanvas.save(); return mBitmap;