AS报错：

AAPT: error: resource android:attr/colorError not found.

解决办法：
build.gradle设置成如下：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "29.0.2"

    defaultConfig {
        applicationId "com.lgl.answersystem"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
    }

后又报错：

AAPT: error: resource android:attr/dialogCornerRadius not found.

解决办法：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    buildToolsVersion "29.0.2"

    defaultConfig {
        applicationId "com.lgl.answersystem"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
    }