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public static int calculateInSampleSize( BitmapFactory.Options options, int reqWidth, int reqHeight) { // 原始图片的宽高 final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; // 在保证解析出的bitmap宽高分别大于目标尺寸宽高的前提下，取可能的inSampleSize的最大值 while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } |
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public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId, int reqWidth, int reqHeight) { // 首先设置 inJustDecodeBounds=true 来获取图片尺寸 final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeResource(res, resId, options); // 计算 inSampleSize 的值 options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // 根据计算出的 inSampleSize 来解码图片生成Bitmap options.inJustDecodeBounds = false; return BitmapFactory.decodeResource(res, resId, options); } |