安卓开发教程 : What is `Infinity` in ViewPager Sample?

Question

Android 开发者官方教程中的以下代码是什么，Using ViewPager for Screen Slides ？

public class ZoomOutPageTransformer implements ViewPager.PageTransformer {
    //...

    public void transformPage(View view, float position) {
        //...

        if (position < -1) { // **[-Infinity,-1)
            //...
        } else if (position <= 1) { // [-1,1]
            //...
        } else { // (1,+Infinity]
            //...
        }
    }
}

Answer 1

这些评论的意思或多或少是:

if (position < -1) { // here go all 'position' values lesser than -1
    //...
} else if (position <= 1) { // 'position' in range from -1 to 1, including both -1 and 1
    //...
} else { // and then all 'position' values greater than 1 go here
    //...
}

如果您正在寻找 Android 中 Float 类型的“无穷大”值，则有 Float.NEGATIVE_INFINITY 和 Float.POSITIVE_INFINITY 值代表他们。