Instant App：本质、Google Play Instant与无需安装的应用

// build.gradle.kts — instant模块配置
plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
    id("com.google.android.instantapps")
}

android {
    namespace = "com.example.instantapp"
    compileSdk = 35

    defaultConfig {
        applicationId = "com.example.instantapp"
        minSdk = 26
        targetSdk = 35
        versionCode = 1
        versionName = "1.0"
    }

    dynamicFeatures = setOf(
        ":feature_checkout",
        ":feature_catalog"
    )
}

// AndroidManifest.xml用于instant-app — “dist:module dist:instant="true"”标志
// <dist:module dist:instant="true" />

// Feature module — instant的订单完成界面
class CheckoutActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_checkout)

        // Instant app: feature-module的大小不应超过4 MB
        // 先加载缩略图，然后加载完整图片
        // 在feature-module中使用最少的依赖项
    }

    fun upgradeToInstalledApp() {
        // 建议用户安装完整版
        InstantApps.showInstallPrompt(this, "com.example.instantapp", 123)
    }
}

// settings.gradle.kts — 带有feature-modules的项目结构
pluginManagement {
    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

rootProject.name = "InstantAppExample"

include(":app")                    // 基础模块
include(":feature_checkout")     // 订单完成 (instant-ready)
include(":feature_catalog")      // 产品目录 (instant-ready)
include(":feature_profile")      // 用户个人资料（仅已安装版本）

// build.gradle.kts (feature module) — instant-enabled
plugins {
    id("com.android.dynamic-feature")
    id("org.jetbrains.kotlin.android")
}

android {
    namespace = "com.example.feature.checkout"
}

dependencies {
    implementation(project(":app"))
    implementation("androidx.appcompat:appcompat:1.7.0")
}

// AndroidManifest.xml — 在feature-module中处理深层链接
<activity
    android:name=".CatalogActivity"
    android:excludeFromRecents="true">

    <intent-filter
        android:autoVerify="true">
        <action
            android:name="android.intent.action.VIEW" />
        <category
            android:name="android.intent.category.DEFAULT" />
        <category
            android:name="android.intent.category.BROWSABLE" />

        <data
            android:scheme="https"
            android:host="www.example.com"
            android:pathPrefix="/catalog" />
    </intent-filter>

    <!-- instant应用必需 -->
    <meta-data
        android:name="default-url"
        android:value="https://www.example.com/catalog" />
</activity>