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@ -27,7 +27,7 @@ object BitmapUtils { |
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* @return |
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*/ |
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@Throws(IOException::class) |
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fun decodeBitmap(path: String, width: Int, height: Int): Bitmap { |
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fun decodeBitmap(path: String, width: Int, height: Int? = null): Bitmap { |
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val fis = FileInputStream(path) |
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return fis.use { |
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@ -35,44 +35,35 @@ object BitmapUtils { |
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// inJustDecodeBounds如果设置为true,仅仅返回图片实际的宽和高,宽和高是赋值给opts.outWidth,opts.outHeight; |
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op.inJustDecodeBounds = true |
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BitmapFactory.decodeFileDescriptor(fis.fd, null, op) |
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//获取比例大小 |
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val wRatio = ceil((op.outWidth / width).toDouble()).toInt() |
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val hRatio = ceil((op.outHeight / height).toDouble()).toInt() |
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//如果超出指定大小,则缩小相应的比例 |
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if (wRatio > 1 && hRatio > 1) { |
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if (wRatio > hRatio) { |
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op.inSampleSize = wRatio |
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} else { |
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op.inSampleSize = hRatio |
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} |
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} |
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op.inSampleSize = calculateInSampleSize(op, width, height) |
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op.inJustDecodeBounds = false |
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BitmapFactory.decodeFileDescriptor(fis.fd, null, op) |
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} |
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} |
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@Throws(IOException::class) |
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fun decodeBitmap(path: String, width: Int): Bitmap { |
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val fis = FileInputStream(path) |
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return fis.use { |
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val op = BitmapFactory.Options() |
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// inJustDecodeBounds如果设置为true,仅仅返回图片实际的宽和高,宽和高是赋值给opts.outWidth,opts.outHeight; |
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op.inJustDecodeBounds = true |
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BitmapFactory.decodeFileDescriptor(fis.fd, null, op) |
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//获取比例大小 |
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val wRatio = ceil((op.outWidth / width).toDouble()).toInt() |
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//如果超出指定大小,则缩小相应的比例 |
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if (wRatio > 1) { |
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op.inSampleSize = wRatio |
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} |
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op.inJustDecodeBounds = false |
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BitmapFactory.decodeFileDescriptor(fis.fd, null, op) |
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/** |
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*计算 InSampleSize。缺省返回1 |
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* @param options BitmapFactory.Options, |
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* @param width 想要显示的图片的宽度 |
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* @param height 想要显示的图片的高度 |
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* @return |
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*/ |
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private fun calculateInSampleSize( |
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options: BitmapFactory.Options, |
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width: Int? = null, |
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height: Int? = null |
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): Int { |
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//获取比例大小 |
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val wRatio = width?.let { ceil((options.outWidth / it).toDouble()).toInt() } ?: -1 |
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val hRatio = height?.let { ceil((options.outHeight / it).toDouble()).toInt() } ?: -1 |
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//如果超出指定大小,则缩小相应的比例 |
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return when { |
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wRatio > 1 && hRatio > 1 -> max(wRatio, hRatio) |
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wRatio > 1 -> wRatio |
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hRatio > 1 -> hRatio |
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else -> 1 |
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} |
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} |
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/** 从path中获取Bitmap图片 |
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@ -118,17 +109,7 @@ object BitmapUtils { |
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// inJustDecodeBounds如果设置为true,仅仅返回图片实际的宽和高,宽和高是赋值给opts.outWidth,opts.outHeight; |
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op.inJustDecodeBounds = true |
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BitmapFactory.decodeResource(context.resources, resId, op) //获取尺寸信息 |
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//获取比例大小 |
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val wRatio = ceil((op.outWidth / width).toDouble()).toInt() |
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val hRatio = ceil((op.outHeight / height).toDouble()).toInt() |
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//如果超出指定大小,则缩小相应的比例 |
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if (wRatio > 1 && hRatio > 1) { |
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if (wRatio > hRatio) { |
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op.inSampleSize = wRatio |
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} else { |
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op.inSampleSize = hRatio |
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} |
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} |
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op.inSampleSize = calculateInSampleSize(op, width, height) |
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op.inJustDecodeBounds = false |
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return BitmapFactory.decodeResource(context.resources, resId, op) |
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} |
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@ -154,17 +135,7 @@ object BitmapUtils { |
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// inJustDecodeBounds如果设置为true,仅仅返回图片实际的宽和高,宽和高是赋值给opts.outWidth,opts.outHeight; |
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op.inJustDecodeBounds = true |
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BitmapFactory.decodeStream(inputStream, null, op) //获取尺寸信息 |
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//获取比例大小 |
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val wRatio = ceil((op.outWidth / width).toDouble()).toInt() |
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val hRatio = ceil((op.outHeight / height).toDouble()).toInt() |
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//如果超出指定大小,则缩小相应的比例 |
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if (wRatio > 1 && hRatio > 1) { |
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if (wRatio > hRatio) { |
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op.inSampleSize = wRatio |
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} else { |
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op.inSampleSize = hRatio |
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} |
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} |
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op.inSampleSize = calculateInSampleSize(op, width, height) |
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inputStream = context.assets.open(fileNameInAssets) |
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op.inJustDecodeBounds = false |
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BitmapFactory.decodeStream(inputStream, null, op) |
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