Android 技巧之巧用Range注解(IntRange,FloatRange) 和自定义Range

如果将这个方法写成一个工具类或者在BaseActivity or BaseFragment中调用,直接传俩参数就行

但是,如果,我们在开发过程中一不小心,将第二个参数写成了10f,那么可导致不可预期或者Error的发生

这样,Range就应运而生了

加入Range后的Code:

fun alpUpdate(context: Activity, @FloatRange(from = 0.0, to = 1.0) bgAlpha: Float) {

val lp = context.window.attributes

lp.alpha = bgAlpha //0.0-1.0

context.window.attributes = lp

context.window.addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND)

}

一旦传入参数小于或者大于range就会编译错误

先看下FloatRange源码

/*

• Copyright © 2015 The Android Open Source Project

• Licensed under the Apache License, Version 2.0 (the “License”);

• you may not use this file except in compliance with the License.

• You may obtain a copy of the License at

•  http://www.apache.org/licenses/LICENSE