BitmapFactory.options属性翻译
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/**
* If set to true, the decoder will return null (no bitmap), but
* the out... fields will still be set, allowing the caller to query
* the bitmap without having to allocate the memory for its pixels. */
public boolean inJustDecodeBounds;
直译:仅解码边界尺寸。true表示只会解码出图片的长宽等,不会解读pixels。
/**
* If set to a value > 1, requests the decoder to subsample the original
* image, returning a smaller image to save memory. The sample size is
* the number of pixels in either dimension that correspond to a single
* pixel in the decoded bitmap. For example, inSampleSize == 4 returns
* an image that is 1/4 the width/height of the original, and 1/16 the
* number of pixels. Any value <= 1 is treated the same as 1. Note: the
* decoder uses a final value based on powers of 2, any other value will
* be rounded down to the nearest power of 2. */
public int inSampleSize;
样品尺寸(缩小比)。
如果此值>1,解码器会将图片缩小到原图的1/inSampleSize;这个如果<=1,会取1,不会进行缩小。
注意:这个值一定是2ⁿ,如果不是,系统会取一个最近的2ⁿ.
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