Android Toolbar返回按钮颜色修改

        // 代码设置toolbar返回键颜色为白色
        val upArrow = ContextCompat.getDrawable(this, R.drawable.abc_ic_ab_back_material)
        upArrow?.setColorFilter(ContextCompat.getColor(this, android.R.color.white), PorterDuff.Mode.SRC_ATOP)
        supportActionBar?.setHomeAsUpIndicator(upArrow)

<!-- 主要是这个起作用,修改默认返回键的颜色-->
<item name="colorControlNormal">@android:color/white</item>

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