我有问题，当我开始android工作室和重建项目不工作好

Question

运行Android Studio和Build Gradel后，我有这个错误，我无法修复这个。我检查了jdk安装和Sdk安装，但我找不到修复错误的方法。

Cannot resolve class androidx.constraintlayout.widget.ConstraintLayout
ERROR:C:UsersSina.gradlecachestransforms-3e0be1e4ebe8d827889716686ce55c5f3transformedmaterial-1.4.0reslayoutmaterial_clock_display.xml:18: AAPT: error: attribute layout_constraintTop_toTopOf (aka com.example.sinasaadi:layout_constraintTop_toTopOf) not found.
    ERROR:C:UsersSina.gradlecachestransforms-3e0be1e4ebe8d827889716686ce55c5f3transformedmaterial-1.4.0reslayoutmaterial_clock_period_toggle.xml:18: AAPT: error: attribute layout_constraintStart_toEndOf (aka com.example.sinasaadi:layout_constraintStart_toEndOf) not found.
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ERROR:C:UsersSina.gradlecachestransforms-3e0be1e4ebe8d827889716686ce55c5f3transformedmaterial-1.4.0reslayoutmaterial_clock_display.xml:18: AAPT: error: attribute layout_constraintTop_toTopOf (aka com.example.sinasaadi:layout_constraintTop_toTopOf) not found.
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输入图片描述

Answer 1

在android studio中进入file ->缓存失效。并尝试重新启动studio。