diff --git a/app/build.gradle b/app/build.gradle
index 3ffde37..86d0820 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -66,8 +66,25 @@ android {
     flavorDimensions "vendor"
     productFlavors {
         play {
+            minSdk 23
         }
         other {
+            minSdk 23
+        }
+        otherLegacy {
+            minSdk 21
+        }
+    }
+
+    sourceSets {
+        play {
+            java.srcDirs += ['src/minApi23/java']
+        }
+        other {
+            java.srcDirs += ['src/minApi23/java', 'src/github/java']
+        }
+        otherLegacy {
+            java.srcDirs += ['src/minApi21/java', 'src/github/java']
         }
     }
 
@@ -95,72 +112,145 @@ android {
         variant.outputs.configureEach {
             outputFileName = (outputFileName as String).replace("-release", "")
             outputFileName = (outputFileName as String).replace("-play", "-play")
+            outputFileName = (outputFileName as String).replace("-otherLegacy", "-legacy-android-5")
             outputFileName = (outputFileName as String).replace("-other", "")
         }
     }
 }
 
 dependencies {
-    implementation(fileTree("libs"))
+    // libbox
+    playImplementation(files("libs/libbox.aar"))
+    otherImplementation(files("libs/libbox.aar"))
+    otherLegacyImplementation(files("libs/libbox-legacy.aar"))
 
-    implementation "androidx.core:core-ktx:1.16.0"
-    implementation 'androidx.compose.ui:ui'
+    // API level specific versions
+    def lifecycleVersion23 = "2.10.0"
+    def roomVersion23 = "2.8.4"
+    def workVersion23 = "2.11.0"
+    def cameraVersion23 = "1.5.2"
+    def browserVersion23 = "1.9.0"
+
+    def lifecycleVersion21 = "2.9.4"
+    def roomVersion21 = "2.7.2"
+    def workVersion21 = "2.10.5"
+    def cameraVersion21 = "1.4.2"
+    def browserVersion21 = "1.9.0"
+
+    // Common dependencies (no API level difference)
+    implementation "androidx.core:core-ktx:1.17.0"
     implementation "androidx.appcompat:appcompat:1.7.1"
-    implementation "com.google.android.material:material:1.12.0"
+    implementation "com.google.android.material:material:1.13.0"
     implementation "androidx.constraintlayout:constraintlayout:2.2.1"
-    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.9.2"
-    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.9.2"
-    implementation "androidx.navigation:navigation-fragment-ktx:2.9.3"
-    implementation "androidx.navigation:navigation-ui-ktx:2.9.3"
-    implementation "com.google.zxing:core:3.5.3"
-    implementation "androidx.room:room-runtime:2.7.2"
+    implementation "androidx.navigation:navigation-fragment-ktx:2.9.6"
+    implementation "androidx.navigation:navigation-ui-ktx:2.9.6"
+    implementation "com.google.zxing:core:3.5.4"
     implementation "androidx.coordinatorlayout:coordinatorlayout:1.3.0"
     implementation "androidx.preference:preference-ktx:1.2.1"
-    implementation "androidx.camera:camera-view:1.4.2"
-    implementation "androidx.camera:camera-lifecycle:1.4.2"
-    implementation "androidx.camera:camera-camera2:1.4.2"
-    ksp "androidx.room:room-compiler:2.7.2"
-    implementation "androidx.work:work-runtime-ktx:2.10.3"
-    implementation "androidx.browser:browser:1.9.0"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2"
-    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3"
-
-    // DO NOT UPDATE (minSdkVersion updated)
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0"
     implementation "com.blacksquircle.ui:editorkit:2.2.0"
     implementation "com.blacksquircle.ui:language-json:2.2.0"
-
     implementation("com.android.tools.smali:smali-dexlib2:3.0.9") {
         exclude group: "com.google.guava", module: "guava"
     }
-    implementation "com.google.guava:guava:33.4.8-android"
+    implementation "com.google.guava:guava:33.5.0-android"
+
+    // API 23+ dependencies (play/other)
+    playImplementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion23"
+    playImplementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycleVersion23"
+    playImplementation "androidx.room:room-runtime:$roomVersion23"
+    playImplementation "androidx.work:work-runtime-ktx:$workVersion23"
+    playImplementation "androidx.camera:camera-view:$cameraVersion23"
+    playImplementation "androidx.camera:camera-lifecycle:$cameraVersion23"
+    playImplementation "androidx.camera:camera-camera2:$cameraVersion23"
+    playImplementation "androidx.browser:browser:$browserVersion23"
+    playAnnotationProcessor "androidx.room:room-compiler:$roomVersion23"
+    kspPlay "androidx.room:room-compiler:$roomVersion23"
+
+    otherImplementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion23"
+    otherImplementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycleVersion23"
+    otherImplementation "androidx.room:room-runtime:$roomVersion23"
+    otherImplementation "androidx.work:work-runtime-ktx:$workVersion23"
+    otherImplementation "androidx.camera:camera-view:$cameraVersion23"
+    otherImplementation "androidx.camera:camera-lifecycle:$cameraVersion23"
+    otherImplementation "androidx.camera:camera-camera2:$cameraVersion23"
+    otherImplementation "androidx.browser:browser:$browserVersion23"
+    kspOther "androidx.room:room-compiler:$roomVersion23"
+
+    // API 21 dependencies (otherLegacy)
+    otherLegacyImplementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion21"
+    otherLegacyImplementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycleVersion21"
+    otherLegacyImplementation "androidx.room:room-runtime:$roomVersion21"
+    otherLegacyImplementation "androidx.work:work-runtime-ktx:$workVersion21"
+    otherLegacyImplementation "androidx.camera:camera-view:$cameraVersion21"
+    otherLegacyImplementation "androidx.camera:camera-lifecycle:$cameraVersion21"
+    otherLegacyImplementation "androidx.camera:camera-camera2:$cameraVersion21"
+    otherLegacyImplementation "androidx.browser:browser:$browserVersion21"
+    kspOtherLegacy "androidx.room:room-compiler:$roomVersion21"
+
+    // Play Store specific
     playImplementation "com.google.android.play:app-update-ktx:2.1.0"
     playImplementation "com.google.android.gms:play-services-mlkit-barcode-scanning:18.3.1"
 
-    // Shizuku for silent install (other flavor only)
-    otherImplementation 'dev.rikka.shizuku:api:13.1.5'
-    otherImplementation 'dev.rikka.shizuku:provider:13.1.5'
+    // Shizuku (play and other flavors, API 23+ only)
+    def shizukuVersion = '12.2.0'
+    playImplementation "dev.rikka.shizuku:api:$shizukuVersion"
+    playImplementation "dev.rikka.shizuku:provider:$shizukuVersion"
+    playImplementation 'org.lsposed.hiddenapibypass:hiddenapibypass:4.3'
+    otherImplementation "dev.rikka.shizuku:api:$shizukuVersion"
+    otherImplementation "dev.rikka.shizuku:provider:$shizukuVersion"
     otherImplementation 'org.lsposed.hiddenapibypass:hiddenapibypass:4.3'
 
-    // Compose dependencies
-    def composeBom = platform('androidx.compose:compose-bom:2025.01.01')
-    implementation composeBom
-    androidTestImplementation composeBom
-    implementation 'androidx.compose.material3:material3'
-    implementation 'androidx.compose.ui:ui'
-    implementation 'androidx.compose.ui:ui-tooling-preview'
+    // Compose dependencies - API 23+ (play/other)
+    def composeBom23 = platform('androidx.compose:compose-bom:2025.12.01')
+    def activityVersion23 = "1.12.2"
+    def lifecycleComposeVersion23 = "2.10.0"
+
+    playImplementation composeBom23
+    playImplementation 'androidx.compose.material3:material3'
+    playImplementation 'androidx.compose.ui:ui'
+    playImplementation 'androidx.compose.ui:ui-tooling-preview'
+    playImplementation 'androidx.compose.material:material-icons-extended'
+    playImplementation "androidx.activity:activity-compose:$activityVersion23"
+    playImplementation "androidx.navigation:navigation-compose:2.9.6"
+    playImplementation "androidx.lifecycle:lifecycle-viewmodel-compose:$lifecycleComposeVersion23"
+    playImplementation 'androidx.compose.runtime:runtime-livedata'
+
+    otherImplementation composeBom23
+    otherImplementation 'androidx.compose.material3:material3'
+    otherImplementation 'androidx.compose.ui:ui'
+    otherImplementation 'androidx.compose.ui:ui-tooling-preview'
+    otherImplementation 'androidx.compose.material:material-icons-extended'
+    otherImplementation "androidx.activity:activity-compose:$activityVersion23"
+    otherImplementation "androidx.navigation:navigation-compose:2.9.6"
+    otherImplementation "androidx.lifecycle:lifecycle-viewmodel-compose:$lifecycleComposeVersion23"
+    otherImplementation 'androidx.compose.runtime:runtime-livedata'
+
+    // Compose dependencies - API 21 (otherLegacy)
+    def composeBom21 = platform('androidx.compose:compose-bom:2025.01.00')
+    def activityVersion21 = "1.11.0"
+    def lifecycleComposeVersion21 = "2.9.4"
+
+    otherLegacyImplementation composeBom21
+    otherLegacyImplementation 'androidx.compose.material3:material3'
+    otherLegacyImplementation 'androidx.compose.ui:ui'
+    otherLegacyImplementation 'androidx.compose.ui:ui-tooling-preview'
+    otherLegacyImplementation 'androidx.compose.material:material-icons-extended'
+    otherLegacyImplementation "androidx.activity:activity-compose:$activityVersion21"
+    otherLegacyImplementation "androidx.navigation:navigation-compose:2.9.6"
+    otherLegacyImplementation "androidx.lifecycle:lifecycle-viewmodel-compose:$lifecycleComposeVersion21"
+    otherLegacyImplementation 'androidx.compose.runtime:runtime-livedata'
+
+    // Debug/Test dependencies
     debugImplementation 'androidx.compose.ui:ui-tooling'
-    androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
     debugImplementation 'androidx.compose.ui:ui-test-manifest'
-    implementation 'androidx.compose.material:material-icons-extended'
-    implementation 'androidx.activity:activity-compose:1.10.1'
-    implementation 'me.zhanghai.compose.preference:library:1.1.1'
-    implementation "androidx.navigation:navigation-compose:2.9.3"
-    implementation "androidx.lifecycle:lifecycle-viewmodel-compose:2.9.2"
-    implementation "androidx.compose.runtime:runtime-livedata"
-    implementation "sh.calvin.reorderable:reorderable:2.3.3"
+    androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
+
+    // Common Compose-related libraries
+    implementation "sh.calvin.reorderable:reorderable:3.0.0"
     implementation "com.github.jeziellago:compose-markdown:0.5.4"
     implementation "org.kodein.emoji:emoji-kt:2.3.0"
-
 }
 
 def playCredentialsJSON = rootProject.file("service-account-credentials.json")
diff --git a/app/src/github/AndroidManifest.xml b/app/src/github/AndroidManifest.xml
new file mode 100644
index 0000000..85fdf1e
--- /dev/null
+++ b/app/src/github/AndroidManifest.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+    <uses-permission android:name="android.permission.UPDATE_PACKAGES_WITHOUT_USER_ACTION" />
+
+    <application>
+        <receiver
+            android:name=".vendor.InstallResultReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="io.nekohasekai.sfa.INSTALL_COMPLETE" />
+            </intent-filter>
+        </receiver>
+    </application>
+
+</manifest>
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/ApkDownloader.kt b/app/src/github/java/io/nekohasekai/sfa/vendor/ApkDownloader.kt
similarity index 100%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/ApkDownloader.kt
rename to app/src/github/java/io/nekohasekai/sfa/vendor/ApkDownloader.kt
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/GitHubUpdateChecker.kt b/app/src/github/java/io/nekohasekai/sfa/vendor/GitHubUpdateChecker.kt
similarity index 93%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/GitHubUpdateChecker.kt
rename to app/src/github/java/io/nekohasekai/sfa/vendor/GitHubUpdateChecker.kt
index fa1a432..6a0c818 100644
--- a/app/src/other/java/io/nekohasekai/sfa/vendor/GitHubUpdateChecker.kt
+++ b/app/src/github/java/io/nekohasekai/sfa/vendor/GitHubUpdateChecker.kt
@@ -1,5 +1,6 @@
 package io.nekohasekai.sfa.vendor
 
+import android.os.Build
 import io.nekohasekai.libbox.Libbox
 import io.nekohasekai.sfa.BuildConfig
 import io.nekohasekai.sfa.ktx.unwrap
@@ -39,8 +40,11 @@ class GitHubUpdateChecker : Closeable {
             return null
         }
 
+        val isLegacy = Build.VERSION.SDK_INT < Build.VERSION_CODES.M
         val apkAsset = release.assets.find { asset ->
-            asset.name.endsWith(".apk") && !asset.name.contains("play")
+            asset.name.endsWith(".apk") &&
+                !asset.name.contains("play") &&
+                asset.name.contains("legacy-android-5") == isLegacy
         }
 
         return UpdateInfo(
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/InstallResultReceiver.kt b/app/src/github/java/io/nekohasekai/sfa/vendor/InstallResultReceiver.kt
similarity index 100%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/InstallResultReceiver.kt
rename to app/src/github/java/io/nekohasekai/sfa/vendor/InstallResultReceiver.kt
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/RootInstaller.kt b/app/src/github/java/io/nekohasekai/sfa/vendor/RootInstaller.kt
similarity index 100%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/RootInstaller.kt
rename to app/src/github/java/io/nekohasekai/sfa/vendor/RootInstaller.kt
diff --git a/app/src/github/java/io/nekohasekai/sfa/vendor/SystemPackageInstaller.kt b/app/src/github/java/io/nekohasekai/sfa/vendor/SystemPackageInstaller.kt
new file mode 100644
index 0000000..bf62dce
--- /dev/null
+++ b/app/src/github/java/io/nekohasekai/sfa/vendor/SystemPackageInstaller.kt
@@ -0,0 +1,52 @@
+package io.nekohasekai.sfa.vendor
+
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import java.io.File
+import java.io.FileInputStream
+import android.content.pm.PackageInstaller as AndroidPackageInstaller
+
+object SystemPackageInstaller {
+
+    fun canSystemSilentInstall(): Boolean {
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
+    }
+
+    fun install(context: Context, apkFile: File): Result<Unit> {
+        return try {
+            val packageInstaller = context.packageManager.packageInstaller
+            val params = AndroidPackageInstaller.SessionParams(AndroidPackageInstaller.SessionParams.MODE_FULL_INSTALL)
+            params.setAppPackageName(context.packageName)
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+                params.setRequireUserAction(AndroidPackageInstaller.SessionParams.USER_ACTION_NOT_REQUIRED)
+            }
+
+            val sessionId = packageInstaller.createSession(params)
+            packageInstaller.openSession(sessionId).use { session ->
+                session.openWrite("update.apk", 0, apkFile.length()).use { outputStream ->
+                    FileInputStream(apkFile).use { inputStream ->
+                        inputStream.copyTo(outputStream)
+                    }
+                    session.fsync(outputStream)
+                }
+
+                val intent = Intent(context, InstallResultReceiver::class.java).apply {
+                    action = InstallResultReceiver.ACTION_INSTALL_COMPLETE
+                }
+                val pendingIntent = PendingIntent.getBroadcast(
+                    context,
+                    sessionId,
+                    intent,
+                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE
+                )
+
+                session.commit(pendingIntent.intentSender)
+            }
+            Result.success(Unit)
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
+    }
+}
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/UpdateWorker.kt b/app/src/github/java/io/nekohasekai/sfa/vendor/UpdateWorker.kt
similarity index 100%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/UpdateWorker.kt
rename to app/src/github/java/io/nekohasekai/sfa/vendor/UpdateWorker.kt
diff --git a/app/src/main/java/io/nekohasekai/sfa/compose/screen/dashboard/DashboardSettingsBottomSheet.kt b/app/src/main/java/io/nekohasekai/sfa/compose/screen/dashboard/DashboardSettingsBottomSheet.kt
index 50ccac9..ceffbe5 100644
--- a/app/src/main/java/io/nekohasekai/sfa/compose/screen/dashboard/DashboardSettingsBottomSheet.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/compose/screen/dashboard/DashboardSettingsBottomSheet.kt
@@ -5,7 +5,6 @@ import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.core.spring
 import androidx.compose.animation.core.tween
 import androidx.compose.foundation.BorderStroke
-import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.gestures.Orientation
 import androidx.compose.foundation.gestures.draggable
 import androidx.compose.foundation.gestures.rememberDraggableState
@@ -28,6 +27,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.DragHandle
 import androidx.compose.material.icons.filled.RestartAlt
+import io.nekohasekai.sfa.compat.animateItemCompat
 import androidx.compose.material.icons.outlined.BugReport
 import androidx.compose.material.icons.outlined.Cable
 import androidx.compose.material.icons.outlined.Download
@@ -67,7 +67,7 @@ import androidx.compose.ui.zIndex
 import io.nekohasekai.sfa.BuildConfig
 import io.nekohasekai.sfa.R
 
-@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun DashboardSettingsBottomSheet(
     sheetState: SheetState,
@@ -282,8 +282,8 @@ fun DashboardSettingsBottomSheet(
                             dragOffset = 0f
                         },
                         modifier =
-                            Modifier.animateItemPlacement(
-                                animationSpec =
+                            animateItemCompat(
+                                placementSpec =
                                     spring(
                                         dampingRatio = Spring.DampingRatioMediumBouncy,
                                         stiffness = Spring.StiffnessLow,
diff --git a/app/src/main/java/io/nekohasekai/sfa/ktx/Shares.kt b/app/src/main/java/io/nekohasekai/sfa/ktx/Shares.kt
index 029d6d2..f5120a8 100644
--- a/app/src/main/java/io/nekohasekai/sfa/ktx/Shares.kt
+++ b/app/src/main/java/io/nekohasekai/sfa/ktx/Shares.kt
@@ -6,7 +6,7 @@ import android.graphics.Bitmap
 import android.graphics.Color
 import androidx.core.content.FileProvider
 import androidx.fragment.app.FragmentActivity
-import com.google.android.material.R
+import androidx.appcompat.R as AppCompatR
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.qrcode.QRCodeWriter
 import io.nekohasekai.libbox.Libbox
@@ -46,7 +46,7 @@ suspend fun Context.shareProfile(profile: Profile) {
                 Intent(Intent.ACTION_SEND).setType("application/octet-stream")
                     .setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
                     .putExtra(Intent.EXTRA_STREAM, uri),
-                getString(R.string.abc_shareactionprovider_share_with),
+                getString(AppCompatR.string.abc_shareactionprovider_share_with),
             ),
         )
     }
@@ -59,7 +59,7 @@ fun FragmentActivity.shareProfileURL(profile: Profile) {
             profile.typed.remoteURL,
         )
     val imageSize = dp2px(256)
-    val color = getAttrColor(com.google.android.material.R.attr.colorPrimary)
+    val color = getAttrColor(androidx.appcompat.R.attr.colorPrimary)
     val image = QRCodeWriter().encode(link, BarcodeFormat.QR_CODE, imageSize, imageSize, null)
     val imageWidth = image.width
     val imageHeight = image.height
diff --git a/app/src/minApi21/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt b/app/src/minApi21/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt
new file mode 100644
index 0000000..cfeb2bf
--- /dev/null
+++ b/app/src/minApi21/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt
@@ -0,0 +1,11 @@
+package io.nekohasekai.sfa.compat
+
+import androidx.compose.animation.core.FiniteAnimationSpec
+import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.IntOffset
+
+@Suppress("UNUSED_PARAMETER")
+fun LazyItemScope.animateItemCompat(
+    placementSpec: FiniteAnimationSpec<IntOffset>,
+): Modifier = Modifier
diff --git a/app/src/other/AndroidManifest.xml b/app/src/minApi23/AndroidManifest.xml
similarity index 61%
rename from app/src/other/AndroidManifest.xml
rename to app/src/minApi23/AndroidManifest.xml
index 697a21d..89cd700 100644
--- a/app/src/other/AndroidManifest.xml
+++ b/app/src/minApi23/AndroidManifest.xml
@@ -2,9 +2,6 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
-    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
-    <uses-permission android:name="android.permission.UPDATE_PACKAGES_WITHOUT_USER_ACTION" />
-
     <uses-permission android:name="moe.shizuku.manager.permission.API_V23" />
 
     <uses-sdk tools:overrideLibrary="rikka.shizuku.provider,rikka.shizuku.api,rikka.shizuku.aidl,rikka.shizuku.shared" />
@@ -16,14 +13,6 @@
             android:exported="true"
             android:multiprocess="false"
             android:permission="android.permission.INTERACT_ACROSS_USERS_FULL" />
-
-        <receiver
-            android:name=".vendor.InstallResultReceiver"
-            android:exported="false">
-            <intent-filter>
-                <action android:name="io.nekohasekai.sfa.INSTALL_COMPLETE" />
-            </intent-filter>
-        </receiver>
     </application>
 
 </manifest>
diff --git a/app/src/other/java/android/content/IIntentReceiver.java b/app/src/minApi23/java/android/content/IIntentReceiver.java
similarity index 100%
rename from app/src/other/java/android/content/IIntentReceiver.java
rename to app/src/minApi23/java/android/content/IIntentReceiver.java
diff --git a/app/src/other/java/android/content/IIntentSender.java b/app/src/minApi23/java/android/content/IIntentSender.java
similarity index 100%
rename from app/src/other/java/android/content/IIntentSender.java
rename to app/src/minApi23/java/android/content/IIntentSender.java
diff --git a/app/src/other/java/android/content/pm/IPackageInstaller.java b/app/src/minApi23/java/android/content/pm/IPackageInstaller.java
similarity index 100%
rename from app/src/other/java/android/content/pm/IPackageInstaller.java
rename to app/src/minApi23/java/android/content/pm/IPackageInstaller.java
diff --git a/app/src/other/java/android/content/pm/IPackageInstallerSession.java b/app/src/minApi23/java/android/content/pm/IPackageInstallerSession.java
similarity index 100%
rename from app/src/other/java/android/content/pm/IPackageInstallerSession.java
rename to app/src/minApi23/java/android/content/pm/IPackageInstallerSession.java
diff --git a/app/src/minApi23/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt b/app/src/minApi23/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt
new file mode 100644
index 0000000..d8b9a27
--- /dev/null
+++ b/app/src/minApi23/java/io/nekohasekai/sfa/compat/LazyItemModifiers.kt
@@ -0,0 +1,10 @@
+package io.nekohasekai.sfa.compat
+
+import androidx.compose.animation.core.FiniteAnimationSpec
+import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.IntOffset
+
+fun LazyItemScope.animateItemCompat(
+    placementSpec: FiniteAnimationSpec<IntOffset>,
+): Modifier = Modifier.animateItem(placementSpec = placementSpec)
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/ShizukuInstaller.kt b/app/src/minApi23/java/io/nekohasekai/sfa/vendor/ShizukuInstaller.kt
similarity index 100%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/ShizukuInstaller.kt
rename to app/src/minApi23/java/io/nekohasekai/sfa/vendor/ShizukuInstaller.kt
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/hidden/IPackageManager.java b/app/src/minApi23/java/io/nekohasekai/sfa/vendor/hidden/IPackageManager.java
similarity index 100%
rename from app/src/other/java/io/nekohasekai/sfa/vendor/hidden/IPackageManager.java
rename to app/src/minApi23/java/io/nekohasekai/sfa/vendor/hidden/IPackageManager.java
diff --git a/app/src/other/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt b/app/src/other/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt
index 8774a61..458c6a3 100644
--- a/app/src/other/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt
+++ b/app/src/other/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt
@@ -1,13 +1,8 @@
 package io.nekohasekai.sfa.vendor
 
-import android.app.PendingIntent
 import android.content.Context
-import android.content.Intent
-import android.content.pm.PackageInstaller
-import android.os.Build
 import io.nekohasekai.sfa.database.Settings
 import java.io.File
-import java.io.FileInputStream
 
 enum class InstallMethod {
     PACKAGE_INSTALLER,
@@ -29,12 +24,12 @@ object ApkInstaller {
         return when (method) {
             InstallMethod.SHIZUKU -> ShizukuInstaller.install(apkFile)
             InstallMethod.ROOT -> RootInstaller.install(apkFile)
-            InstallMethod.PACKAGE_INSTALLER -> installWithPackageInstaller(context, apkFile)
+            InstallMethod.PACKAGE_INSTALLER -> SystemPackageInstaller.install(context, apkFile)
         }
     }
 
     fun canSystemSilentInstall(): Boolean {
-        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.S
+        return SystemPackageInstaller.canSystemSilentInstall()
     }
 
     suspend fun canSilentInstall(): Boolean {
@@ -45,40 +40,4 @@ object ApkInstaller {
             InstallMethod.ROOT -> RootInstaller.checkAccess()
         }
     }
-
-    private fun installWithPackageInstaller(context: Context, apkFile: File): Result<Unit> {
-        return try {
-            val packageInstaller = context.packageManager.packageInstaller
-            val params = PackageInstaller.SessionParams(PackageInstaller.SessionParams.MODE_FULL_INSTALL)
-            params.setAppPackageName(context.packageName)
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
-                params.setRequireUserAction(PackageInstaller.SessionParams.USER_ACTION_NOT_REQUIRED)
-            }
-
-            val sessionId = packageInstaller.createSession(params)
-            packageInstaller.openSession(sessionId).use { session ->
-                session.openWrite("update.apk", 0, apkFile.length()).use { outputStream ->
-                    FileInputStream(apkFile).use { inputStream ->
-                        inputStream.copyTo(outputStream)
-                    }
-                    session.fsync(outputStream)
-                }
-
-                val intent = Intent(context, InstallResultReceiver::class.java).apply {
-                    action = InstallResultReceiver.ACTION_INSTALL_COMPLETE
-                }
-                val pendingIntent = PendingIntent.getBroadcast(
-                    context,
-                    sessionId,
-                    intent,
-                    PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE
-                )
-
-                session.commit(pendingIntent.intentSender)
-            }
-            Result.success(Unit)
-        } catch (e: Exception) {
-            Result.failure(e)
-        }
-    }
 }
diff --git a/app/src/otherLegacy/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt b/app/src/otherLegacy/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt
new file mode 100644
index 0000000..df0ffb7
--- /dev/null
+++ b/app/src/otherLegacy/java/io/nekohasekai/sfa/vendor/ApkInstaller.kt
@@ -0,0 +1,41 @@
+package io.nekohasekai.sfa.vendor
+
+import android.content.Context
+import io.nekohasekai.sfa.database.Settings
+import java.io.File
+
+enum class InstallMethod {
+    PACKAGE_INSTALLER,
+    ROOT,
+}
+
+object ApkInstaller {
+
+    fun getConfiguredMethod(): InstallMethod {
+        return if (Settings.silentInstallEnabled) {
+            val method = Settings.silentInstallMethod
+            if (method == "SHIZUKU") InstallMethod.ROOT else InstallMethod.valueOf(method)
+        } else {
+            InstallMethod.PACKAGE_INSTALLER
+        }
+    }
+
+    suspend fun install(context: Context, apkFile: File, method: InstallMethod = getConfiguredMethod()): Result<Unit> {
+        return when (method) {
+            InstallMethod.ROOT -> RootInstaller.install(apkFile)
+            InstallMethod.PACKAGE_INSTALLER -> SystemPackageInstaller.install(context, apkFile)
+        }
+    }
+
+    fun canSystemSilentInstall(): Boolean {
+        return SystemPackageInstaller.canSystemSilentInstall()
+    }
+
+    suspend fun canSilentInstall(): Boolean {
+        val method = getConfiguredMethod()
+        return when (method) {
+            InstallMethod.PACKAGE_INSTALLER -> canSystemSilentInstall()
+            InstallMethod.ROOT -> RootInstaller.checkAccess()
+        }
+    }
+}
diff --git a/app/src/otherLegacy/java/io/nekohasekai/sfa/vendor/Vendor.kt b/app/src/otherLegacy/java/io/nekohasekai/sfa/vendor/Vendor.kt
new file mode 100644
index 0000000..196bf99
--- /dev/null
+++ b/app/src/otherLegacy/java/io/nekohasekai/sfa/vendor/Vendor.kt
@@ -0,0 +1,149 @@
+package io.nekohasekai.sfa.vendor
+
+import android.app.Activity
+import android.content.Intent
+import android.net.Uri
+import android.util.Log
+import androidx.camera.core.ImageAnalysis
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import io.nekohasekai.sfa.Application
+import io.nekohasekai.sfa.R
+import io.nekohasekai.sfa.database.Settings
+import io.nekohasekai.sfa.update.UpdateCheckException
+import io.nekohasekai.sfa.update.UpdateInfo
+import io.nekohasekai.sfa.update.UpdateState
+import io.nekohasekai.sfa.update.UpdateTrack
+
+object Vendor : VendorInterface {
+    private const val TAG = "Vendor"
+
+    override fun checkUpdate(
+        activity: Activity,
+        byUser: Boolean,
+    ) {
+        try {
+            val updateInfo = checkUpdateAsync()
+            if (updateInfo != null) {
+                activity.runOnUiThread {
+                    showUpdateDialog(activity, updateInfo)
+                }
+            } else if (byUser) {
+                activity.runOnUiThread {
+                    showNoUpdatesDialog(activity)
+                }
+            }
+        } catch (e: UpdateCheckException.TrackNotSupported) {
+            Log.d(TAG, "checkUpdate: track not supported")
+            if (byUser) {
+                activity.runOnUiThread {
+                    showTrackNotSupportedDialog(activity)
+                }
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "checkUpdate: ", e)
+            if (byUser) {
+                activity.runOnUiThread {
+                    showNoUpdatesDialog(activity)
+                }
+            }
+        }
+    }
+
+    private fun showUpdateDialog(activity: Activity, updateInfo: UpdateInfo) {
+        val message = buildString {
+            append(activity.getString(R.string.new_version_available, updateInfo.versionName))
+            if (!updateInfo.releaseNotes.isNullOrBlank()) {
+                append("\n\n")
+                append(updateInfo.releaseNotes.take(500))
+                if (updateInfo.releaseNotes.length > 500) {
+                    append("...")
+                }
+            }
+        }
+
+        MaterialAlertDialogBuilder(activity)
+            .setTitle(R.string.check_update)
+            .setMessage(message)
+            .setPositiveButton(R.string.update) { _, _ ->
+                val intent = Intent(Intent.ACTION_VIEW, Uri.parse(updateInfo.releaseUrl))
+                activity.startActivity(intent)
+            }
+            .setNegativeButton(R.string.cancel, null)
+            .show()
+    }
+
+    private fun showNoUpdatesDialog(activity: Activity) {
+        MaterialAlertDialogBuilder(activity)
+            .setTitle(R.string.check_update)
+            .setMessage(R.string.no_updates_available)
+            .setPositiveButton(R.string.ok, null)
+            .show()
+    }
+
+    private fun showTrackNotSupportedDialog(activity: Activity) {
+        MaterialAlertDialogBuilder(activity)
+            .setTitle(R.string.check_update)
+            .setMessage(R.string.update_track_not_supported)
+            .setPositiveButton(R.string.ok, null)
+            .show()
+    }
+
+    override fun createQRCodeAnalyzer(
+        onSuccess: (String) -> Unit,
+        onFailure: (Exception) -> Unit,
+    ): ImageAnalysis.Analyzer? {
+        return null
+    }
+
+    override fun isPerAppProxyAvailable(): Boolean {
+        return true
+    }
+
+    override fun supportsTrackSelection(): Boolean {
+        return true
+    }
+
+    override fun checkUpdateAsync(): UpdateInfo? {
+        val track = UpdateTrack.fromString(Settings.updateTrack)
+        return GitHubUpdateChecker().use { checker ->
+            checker.checkUpdate(track)
+        }
+    }
+
+    override fun supportsSilentInstall(): Boolean {
+        return true
+    }
+
+    override fun supportsAutoUpdate(): Boolean {
+        return true
+    }
+
+    override fun scheduleAutoUpdate() {
+        UpdateWorker.schedule(io.nekohasekai.sfa.Application.application)
+    }
+
+    override suspend fun verifySilentInstallMethod(method: String): Boolean {
+        return when (method) {
+            "PACKAGE_INSTALLER" -> {
+                ApkInstaller.canSystemSilentInstall() &&
+                    Application.application.packageManager.canRequestPackageInstalls()
+            }
+            "ROOT" -> RootInstaller.checkAccess()
+            else -> false
+        }
+    }
+
+    override suspend fun downloadAndInstall(context: android.content.Context, downloadUrl: String): Result<Unit> {
+        return try {
+            val cachedApk = UpdateState.cachedApkFile.value
+            val apkFile = if (cachedApk != null && cachedApk.exists() && cachedApk.length() > 0) {
+                cachedApk
+            } else {
+                ApkDownloader().use { it.download(downloadUrl) }
+            }
+            ApkInstaller.install(context, apkFile)
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
+    }
+}