diff --git a/apps/android/app/build.gradle.kts b/apps/android/app/build.gradle.kts
index 73882f69439..92e2d966150 100644
--- a/apps/android/app/build.gradle.kts
+++ b/apps/android/app/build.gradle.kts
@@ -63,7 +63,7 @@ android {
 
     defaultConfig {
         applicationId = "ai.openclaw.app"
-        minSdk = 31
+        minSdk = 26
         targetSdk = 36
         versionCode = 2026032000
         versionName = "2026.3.20"
diff --git a/apps/android/app/src/main/java/ai/openclaw/app/NodeForegroundService.kt b/apps/android/app/src/main/java/ai/openclaw/app/NodeForegroundService.kt
index 4c7ccdd56e5..fae58f2965c 100644
--- a/apps/android/app/src/main/java/ai/openclaw/app/NodeForegroundService.kt
+++ b/apps/android/app/src/main/java/ai/openclaw/app/NodeForegroundService.kt
@@ -8,6 +8,7 @@ import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
 import android.content.pm.ServiceInfo
+import android.os.Build
 import androidx.core.app.NotificationCompat
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -137,7 +138,12 @@ class NodeForegroundService : Service() {
       updateNotification(notification)
       return
     }
-    startForeground(NOTIFICATION_ID, notification, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC)
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+      startForeground(NOTIFICATION_ID, notification, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC)
+    } else {
+      @Suppress("DEPRECATION")
+      startForeground(NOTIFICATION_ID, notification)
+    }
     didStartForeground = true
   }
 
diff --git a/apps/android/app/src/main/java/ai/openclaw/app/gateway/GatewayDiscovery.kt b/apps/android/app/src/main/java/ai/openclaw/app/gateway/GatewayDiscovery.kt
index f83af46cc65..a0e2628c66e 100644
--- a/apps/android/app/src/main/java/ai/openclaw/app/gateway/GatewayDiscovery.kt
+++ b/apps/android/app/src/main/java/ai/openclaw/app/gateway/GatewayDiscovery.kt
@@ -6,8 +6,10 @@ import android.net.DnsResolver
 import android.net.NetworkCapabilities
 import android.net.nsd.NsdManager
 import android.net.nsd.NsdServiceInfo
+import android.os.Build
 import android.os.CancellationSignal
 import android.util.Log
+import androidx.annotation.RequiresApi
 import java.io.IOException
 import java.net.InetSocketAddress
 import java.nio.ByteBuffer
@@ -50,7 +52,7 @@ class GatewayDiscovery(
 ) {
   private val nsd = context.getSystemService(NsdManager::class.java)
   private val connectivity = context.getSystemService(ConnectivityManager::class.java)
-  private val dns = DnsResolver.getInstance()
+  private val dns = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) DnsResolver.getInstance() else null
   private val serviceType = "_openclaw-gw._tcp."
   private val wideAreaDomain = System.getenv("OPENCLAW_WIDE_AREA_DOMAIN")
   private val logTag = "OpenClaw/GatewayDiscovery"
@@ -321,8 +323,11 @@ class GatewayDiscovery(
         return null
       }
 
-    val system = queryViaSystemDns(query)
-    if (records(system, Section.ANSWER).any { it.type == type }) return system
+    val system = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+      val system = queryViaSystemDns(query)
+      if (records(system, Section.ANSWER).any { it.type == type }) return system
+      system
+    } else null
 
     val direct = createDirectResolver() ?: return system
     return try {
@@ -333,6 +338,7 @@ class GatewayDiscovery(
     }
   }
 
+  @RequiresApi(Build.VERSION_CODES.Q)
   private suspend fun queryViaSystemDns(query: Message): Message? {
     val network = preferredDnsNetwork()
     val bytes =
@@ -439,11 +445,12 @@ class GatewayDiscovery(
     }
   }
 
-  private suspend fun rawQuery(network: android.net.Network?, wireQuery: ByteArray): ByteArray =
-    suspendCancellableCoroutine { cont ->
+  @RequiresApi(Build.VERSION_CODES.Q)
+  private suspend fun rawQuery(network: android.net.Network?, wireQuery: ByteArray): ByteArray {
+    val dns = this.dns ?: throw IOException("DnsResolver not available on this platform")
+    return suspendCancellableCoroutine { cont ->
       val signal = CancellationSignal()
       cont.invokeOnCancellation { signal.cancel() }
-
       dns.rawQuery(
         network,
         wireQuery,
@@ -461,6 +468,7 @@ class GatewayDiscovery(
         },
       )
     }
+  }
 
   private fun txtValue(records: List<TXTRecord>, key: String): String? {
     val prefix = "$key="
diff --git a/apps/android/app/src/main/java/ai/openclaw/app/ui/OpenClawTheme.kt b/apps/android/app/src/main/java/ai/openclaw/app/ui/OpenClawTheme.kt
index cfcceb4f3da..9b1d0b151c5 100644
--- a/apps/android/app/src/main/java/ai/openclaw/app/ui/OpenClawTheme.kt
+++ b/apps/android/app/src/main/java/ai/openclaw/app/ui/OpenClawTheme.kt
@@ -1,7 +1,12 @@
 package ai.openclaw.app.ui
 
+import android.content.Context
+import android.os.Build
 import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.ColorScheme
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.lightColorScheme
 import androidx.compose.material3.dynamicDarkColorScheme
 import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.runtime.Composable
@@ -13,7 +18,7 @@ import androidx.compose.ui.platform.LocalContext
 fun OpenClawTheme(content: @Composable () -> Unit) {
   val context = LocalContext.current
   val isDark = isSystemInDarkTheme()
-  val colorScheme = if (isDark) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+  val colorScheme = colorScheme(context, isDark)
   val mobileColors = if (isDark) darkMobileColors() else lightMobileColors()
 
   CompositionLocalProvider(LocalMobileColors provides mobileColors) {
@@ -21,6 +26,19 @@ fun OpenClawTheme(content: @Composable () -> Unit) {
   }
 }
 
+private fun colorScheme(context: Context, isDark: Boolean): ColorScheme {
+  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+    return when {
+      isDark -> dynamicDarkColorScheme(context)
+      else -> dynamicLightColorScheme(context)
+    }
+  }
+  return when {
+    isDark -> darkColorScheme()
+    else -> lightColorScheme()
+  }
+}
+
 @Composable
 fun overlayContainerColor(): Color {
   val scheme = MaterialTheme.colorScheme