是Display 的方法! int imageType图片类型
int getBestImageHeight(int imageType)
Returns the best image height for a given image type.
int getBestImageWidth(int imageType)
Returns the best image width for a given image type.
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图片类型有
ALERT
Image type for Alert image.
CHOICE_GROUP_ELEMENT
Image type for ChoiceGroup element image
LIST_ELEMENT
Image type for List element image.