如何在android kotlin中运行时应用按钮样式

Question

如何在android kotlin中应用运行时按钮样式？

我的风格（themes.xml）：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="WhiteButtonLightTheme" parent="ThemeOverlay.AppCompat.Light">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorWhite</item>
        <item name="colorButtonNormal">@color/colorWhite</item>
        <item name="colorControlHighlight">@color/colorGray</item>
    </style>

    <style name="RedButtonLightTheme" parent="ThemeOverlay.AppCompat.Light">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorRed</item>
        <item name="colorButtonNormal">@color/colorWhite</item>
        <item name="colorControlHighlight">@color/colorGray</item>
    </style>

    <style name="GreenButtonLightTheme" parent="ThemeOverlay.AppCompat.Light">
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorGreen</item>
        <item name="colorButtonNormal">@color/colorWhite</item>
        <item name="colorControlHighlight">@color/colorGray</item>
    </style>
</resources>

我的Kotlin代码：

var btnOpt4 = Button(con)
btnOpt4 = rv.findViewById(R.id.btnOption4) as Button

Answer 1

您可以直接通过ID拨打按钮  ( by using apply plugin: 'kotlin-android-extensions')

在您的活动中并通过此设置样式：

 button.setTextAppearance(R.style.AlertDialog_AppCompat)

Answer 2

btnOpt4 = rv.findViewById<Button>(R.id.btnOption4)
btnOpt4.setTextAppearance(R.style.RedButtonLightTheme)

您也可以使用setBackgroundResource方法在运行时更改按钮的背景样式：

btnOpt4.setBackgroundResource(R.drawable.some_drawable)

Answer 3

使用以下代码

btn.setTextAppearance(this, android.R.style.TextAppearance_DeviceDefault_Medium);