class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        Log.i("MainActivity", "当前的模式状态 ${BuildConfig.isModuleMode}")
    }
}

// 根据 isModuleMode 动态切换 集成模式 / 组件模式
if (isModuleMode){
    // 集成模式
    apply plugin: 'com.android.library'
}else{
    // 组件模式
    apply plugin: 'com.android.application'
}
apply plugin: 'kotlin-android'
println("Print Variable : rootProject.ext.androidConfig : ${rootProject.ext.androidConfig}")
// def 相当于 Java 中的 Object
// 声明 config 和 appId 变量 , 并为其赋值
def androidConfig = rootProject.ext.androidConfig
def appId = rootProject.ext.applicationId
android {
    compileSdkVersion androidConfig.compileSdkVersion
    buildToolsVersion "30.0.3"
    defaultConfig {
        if (!isModuleMode){
            // 组件模式 : 必须配置 applicationId
            applicationId appId["library1"]
        }
        minSdkVersion androidConfig.minSdkVersion
        targetSdkVersion androidConfig.targetSdkVersion
        versionCode androidConfig.versionCode
        versionName androidConfig.versionName
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        // 在 BuildConfig 中生成如下字段
        // public static final boolean isModuleMode = false;
        buildConfigField("boolean", "isModuleMode", String.valueOf(isModuleMode))
        // 资源配置
        sourceSets{
            main{
                if (!isModuleMode){
                    // 组件化模式下使用 ComponentAndroidManifest.xml 作为清单文件
                    manifest.srcFile 'src/main/component/AndroidManifest.xml'
                    // 配置额外的 Java 源文件目录
                    java.srcDirs 'src/main/component/java', 'src/main/java'
                }else{
                    // 集成模式 下使用默认设置
                }
            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
}
dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.2'
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="kim.hsl.library1">
    <application>
        <activity android:name=".MainActivity"/>
    </application>
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="kim.hsl.library1">
    <application
        android:name=".Library1Application"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Component">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

package kim.hsl.library1
import android.app.Application
class Library1Application: Application() {
    override fun onCreate() {
        super.onCreate()
    }
}