Android app (TWA) in android/, built with podman; serve assetlinks.json for it

android/app/build.gradle

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+plugins {
+    id "com.android.application"
+}
+
+// The site the app opens. It must serve /.well-known/assetlinks.json naming this app's package and
+// signing key, or Chrome shows its URL bar over the app (see SAW_ANDROID_* in example.env).
+def siteURL = "https://cs2.zio.sh"
+def startPath = "/"
+
+android {
+    namespace "sh.zio.cs2"
+    compileSdk 36
+
+    defaultConfig {
+        // Never change applicationId once installed anywhere: Android treats it as a different app.
+        applicationId "sh.zio.cs2"
+        minSdk 24
+        targetSdk 36
+        // Bump versionCode for every APK you hand out, or Android refuses to update over the old one.
+        versionCode 2
+        versionName "1.0"
+
+        resValue "string", "launch_url", siteURL + startPath
+        resValue "string", "asset_statements",
+            "[{\\\"relation\\\": [\\\"delegate_permission/common.handle_all_urls\\\"], \\\"target\\\": {\\\"namespace\\\": \\\"web\\\", \\\"site\\\": \\\"" + siteURL + "\\\"}}]"
+    }
+
+    signingConfigs {
+        release {
+            storeFile file(System.getenv("KEYSTORE_FILE") ?: "/keystore/release.jks")
+            storePassword System.getenv("KEYSTORE_PASSWORD")
+            keyAlias "release"
+            keyPassword System.getenv("KEYSTORE_PASSWORD")
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt")
+            signingConfig signingConfigs.release
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_17
+        targetCompatibility JavaVersion.VERSION_17
+    }
+}
+
+dependencies {
+    implementation "com.google.androidbrowserhelper:androidbrowserhelper:2.7.3"
+}

android/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- A Trusted Web Activity: the app is the panel, opened full screen in the phone's Chrome.
+     androidbrowserhelper's LauncherActivity does all of it; there is no code of our own. -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="false"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:manageSpaceActivity="com.google.androidbrowserhelper.trusted.ManageDataLauncherActivity"
+        android:supportsRtl="true"
+        android:theme="@android:style/Theme.Translucent.NoTitleBar">
+
+        <meta-data
+            android:name="asset_statements"
+            android:resource="@string/asset_statements" />
+
+        <activity
+            android:name="com.google.androidbrowserhelper.trusted.LauncherActivity"
+            android:exported="true"
+            android:label="@string/app_name">
+            <meta-data
+                android:name="android.support.customtabs.trusted.DEFAULT_URL"
+                android:value="@string/launch_url" />
+            <meta-data
+                android:name="android.support.customtabs.trusted.STATUS_BAR_COLOR"
+                android:resource="@color/theme" />
+            <meta-data
+                android:name="android.support.customtabs.trusted.NAVIGATION_BAR_COLOR"
+                android:resource="@color/background" />
+            <meta-data
+                android:name="android.support.customtabs.trusted.SPLASH_IMAGE_DRAWABLE"
+                android:resource="@drawable/splash" />
+            <meta-data
+                android:name="android.support.customtabs.trusted.SPLASH_SCREEN_BACKGROUND_COLOR"
+                android:resource="@color/background" />
+            <meta-data
+                android:name="android.support.customtabs.trusted.FILE_PROVIDER_AUTHORITY"
+                android:value="sh.zio.cs2.fileprovider" />
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <!-- LauncherActivity uses these library activities by name, so they must be declared here
+             (as Bubblewrap's template does), or R8 renames them and the app crashes on launch.
+             ManageDataLauncherActivity is "Manage space" in Android's app info: the site's data. -->
+        <activity
+            android:name="com.google.androidbrowserhelper.trusted.ManageDataLauncherActivity"
+            android:enabled="true"
+            android:excludeFromRecents="true"
+            android:exported="false">
+            <meta-data
+                android:name="android.support.customtabs.trusted.MANAGE_SPACE_URL"
+                android:value="@string/launch_url" />
+            <intent-filter>
+                <action android:name="android.intent.action.APPLICATION_PREFERENCES" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+        <activity android:name="com.google.androidbrowserhelper.trusted.FocusActivity" />
+        <!-- Used when the phone has no browser that supports TWAs. -->
+        <activity
+            android:name="com.google.androidbrowserhelper.trusted.WebViewFallbackActivity"
+            android:configChanges="orientation|screenSize" />
+
+        <!-- Hands the splash image to Chrome while the panel loads. -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="sh.zio.cs2.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/filepaths" />
+        </provider>
+    </application>
+</manifest>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

android/app/src/main/res/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- The panel's colours: the top bar (theme) and page background in styles.css. -->
+<resources>
+    <color name="theme">#1B1E25</color>
+    <color name="background">#14161B</color>
+</resources>

android/app/src/main/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">zio.sh</string>
+</resources>

android/app/src/main/res/xml/filepaths.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <files-path name="twa_splash" path="twa_splash/" />
+</paths>