在Android Studio 3.4.2中导入约束布局时无法解析符号

Question

我是android的初学者并创建一个程序，完成了所有工作，但是当使用导入语句'import android.support.constraint.ConstraintLayout'代码编辑器导入constraintlayout时，红色高亮显示“无法解析符号”。

Answer 1

您可以尝试使用androidx或使用支持库的28.0.0-alpha1版本

Answer 2

• Refactor and migrate your code to Android X.

• Then add this in your build.gradle file app level.

implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

• Sync changes to the project.

Answer 3

It's a bit hard to guess what the problem is without a code snippet or screenshot of how you're using constraint layout in your XML but I imagine this Gradle issue is caused you have not imported constraint layout to your build.gradle file. Make sure this is in your build.gradle file in the dependencies section:

implementation "androidx.constraintlayout:constraintlayout:1.1.3"

Answer 4

The importing statment is as ...

import android.support.constraint.ConstraintLayout;