Warning: 意外的元素 (uri:““, local:“base-extension“)。所需元素为＜{}codename＞,＜{}layoutlib＞,＜{}api-level＞

Warning: Mapping new ns http://schemas.android.com/repository/android/common/02 to old ns http://schemas.android.com/repository/android/common/01
Warning: Mapping new ns http://schemas.android.com/repository/android/generic/02 to old ns http://schemas.android.com/repository/android/generic/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/02 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/addon2/03 to old ns http://schemas.android.com/sdk/android/repo/addon2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/03 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/03 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Warning: Mapping new ns http://schemas.android.com/sdk/android/repo/sys-img2/02 to old ns http://schemas.android.com/sdk/android/repo/sys-img2/01
Warning: 意外的元素 (uri:"", local:"base-extension")。所需元素为<{}codename>,<{}layoutlib>,<{}api-level>

出现原因：

1.将 Android SDK 从 30.0.3 更新到 31.0.0 以上

2.使用了Android Studio Bumblebee 版本( 2021.1.1 Patch 3) 也就是现在最新版本AS

3.gradle 版本使用了6.7.0及以上

解决方案

apply plugin: 'com.android.application'
apply plugin: 'com.chaquo.python'

android {
    compileSdkVersion 30
    buildToolsVersion "29.0.3"

    defaultConfig {
        //applicationId "com.chaquo.python.hello"
        applicationId "com.webtab.smart_home"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

        python {
            buildPython "python3"
            pip {
                install "bleak"
                install "networkx"
            }
            // If Chaquopy fails to find Python on your build machine, enable the following
            // line and edit it to point to Python 3.5 or later.
            // buildPython "C:/Python36/python.exe"

            //staticProxy "hello"
        }
        ndk {
            abiFilters "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main {
            python {
                srcDirs = ["src/main/python"]
            }
        }
    }

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    //implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

在app的build.gradle文件把compileSdk 改为30或以下即可