UI: disable landscape mode; prevent duplicated benchmark running

examples/llama.android/app/src/main/AndroidManifest.xml

@@ -28,6 +28,7 @@
         <activity
             android:name=".revamp.MainActivity"
             android:exported="true"
+            android:screenOrientation="portrait"
             android:theme="@style/Theme.LlamaAndroid">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/screens/BenchmarkScreen.kt

@@ -15,9 +15,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
-import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.CircularProgressIndicator
@@ -30,6 +28,7 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
@@ -63,10 +62,14 @@ fun BenchmarkScreen(
 
     // UI states
     var isModelCardExpanded by remember { mutableStateOf(false) }
+    var isInitialBenchmarkRun by rememberSaveable { mutableStateOf(false) }
 
     // Run benchmark when entering the screen
     LaunchedEffect(selectedModel) {
-        viewModel.runBenchmark()
+        if (!isInitialBenchmarkRun) {
+            isInitialBenchmarkRun = true
+            viewModel.runBenchmark()
+        }
     }
 
     // Handle back button press

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/theme/Type.kt

@@ -119,7 +119,7 @@ val Typography = Typography(
 val MonospacedTextStyle = TextStyle(
     fontFamily = FontFamily.Monospace,
     fontWeight = FontWeight.Normal,
-    fontSize = 14.sp,
+    fontSize = 12.sp,
     lineHeight = 20.sp,
     letterSpacing = 0.sp
 )