Minor ux improvements

Android/src/app/src/main/java/com/google/aiedge/gallery/data/Model.kt

@@ -19,7 +19,6 @@ package com.google.aiedge.gallery.data
 import android.content.Context
 import com.google.aiedge.gallery.ui.common.chat.PromptTemplate
 import com.google.aiedge.gallery.ui.common.convertValueToTargetType
-import com.google.aiedge.gallery.ui.llmchat.DEFAULT_ACCELERATORS
 import com.google.aiedge.gallery.ui.llmchat.createLlmChatConfigs
 
 data class ModelDataFile(
@@ -82,9 +81,6 @@ data class Model(
   /** The name of the directory to unzip the model to (if it's a zip file). */
   val unzipDir: String = "",
 
-  /** The accelerators the the model can run with. */
-  val accelerators: List<Accelerator> = DEFAULT_ACCELERATORS,
-
   /** The prompt templates for the model (only for LLM). */
   val llmPromptTemplates: List<PromptTemplate> = listOf(),
 
@@ -243,7 +239,9 @@ val MODEL_LLM_GEMMA_2B_GPU_INT4: Model = Model(
   downloadFileName = "gemma-2b-it-gpu-int4.bin",
   url = "https://storage.googleapis.com/tfweb/app_gallery_models/gemma-2b-it-gpu-int4.bin",
   sizeInBytes = 1354301440L,
-  configs = createLlmChatConfigs(),
+  configs = createLlmChatConfigs(
+    accelerators = listOf(Accelerator.GPU)
+  ),
   showBenchmarkButton = false,
   info = LLM_CHAT_INFO,
   learnMoreUrl = "https://huggingface.co/litert-community",
@@ -254,7 +252,9 @@ val MODEL_LLM_GEMMA_2_2B_GPU_INT8: Model = Model(
   downloadFileName = "gemma2-2b-it-gpu-int8.bin",
   url = "https://storage.googleapis.com/tfweb/app_gallery_models/gemma2-2b-it-gpu-int8.bin",
   sizeInBytes = 2627141632L,
-  configs = createLlmChatConfigs(),
+  configs = createLlmChatConfigs(
+    accelerators = listOf(Accelerator.GPU)
+  ),
   showBenchmarkButton = false,
   info = LLM_CHAT_INFO,
   learnMoreUrl = "https://huggingface.co/litert-community",
@@ -265,7 +265,6 @@ val MODEL_LLM_GEMMA_3_1B_INT4: Model = Model(
   downloadFileName = "gemma3-1b-it-int4.task",
   url = "https://huggingface.co/litert-community/Gemma3-1B-IT/resolve/main/gemma3-1b-it-int4.task?download=true",
   sizeInBytes = 554661243L,
-  accelerators = listOf(Accelerator.CPU, Accelerator.GPU),
   configs = createLlmChatConfigs(
     defaultTopK = 64,
     defaultTopP = 0.95f,
@@ -293,7 +292,6 @@ val MODEL_LLM_DEEPSEEK: Model = Model(
   downloadFileName = "deepseek.task",
   url = "https://huggingface.co/litert-community/DeepSeek-R1-Distill-Qwen-1.5B/resolve/main/deepseek_q8_ekv1280.task?download=true",
   sizeInBytes = 1860686856L,
-  accelerators = listOf(Accelerator.CPU),
   configs = createLlmChatConfigs(
     defaultTemperature = 0.6f,
     defaultTopK = 40,

Android/src/app/src/main/java/com/google/aiedge/gallery/ui/llmsingleturn/LlmSingleTurnScreen.kt

@@ -36,7 +36,10 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -80,8 +83,10 @@ fun LlmSingleTurnScreen(
   val selectedModel = modelManagerUiState.selectedModel
   val scope = rememberCoroutineScope()
   val context = LocalContext.current
+  var navigatingUp by remember { mutableStateOf(false) }
 
   val handleNavigateUp = {
+    navigatingUp = true
     navigateUp()
 
     // clean up all models.
@@ -100,6 +105,7 @@ fun LlmSingleTurnScreen(
   // Initialize model when model/download state changes.
   val curDownloadStatus = modelManagerUiState.modelDownloadStatus[selectedModel.name]
   LaunchedEffect(curDownloadStatus, selectedModel.name) {
+    if (!navigatingUp) {
       if (curDownloadStatus?.status == ModelDownloadStatusType.SUCCEEDED) {
         Log.d(
           TAG,
@@ -108,6 +114,7 @@ fun LlmSingleTurnScreen(
         modelManagerViewModel.initializeModel(context, task = task, model = selectedModel)
       }
     }
+  }
 
   val modelInitializationStatus =
     modelManagerUiState.modelInitializationStatus[selectedModel.name]

Android/src/app/src/main/java/com/google/aiedge/gallery/ui/llmsingleturn/PromptTemplatesPanel.kt

@@ -20,6 +20,7 @@ import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -72,8 +73,11 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.dimensionResource
 import androidx.compose.ui.text.TextLayoutResult
 import androidx.compose.ui.text.style.TextOverflow
@@ -111,6 +115,9 @@ fun PromptTemplatesPanel(
     }
   }
   val clipboardManager = LocalClipboardManager.current
+  val focusRequester = remember { FocusRequester() }
+  val focusManager = LocalFocusManager.current
+  val interactionSource = remember { MutableInteractionSource() }
   val expandedStates = remember { mutableStateMapOf<String, Boolean>() }
 
   // Update input editor values when prompt template changes.
@@ -127,9 +134,13 @@ fun PromptTemplatesPanel(
 
   Column(modifier = modifier) {
     // Scrollable tab row for all prompt templates.
-    PrimaryScrollableTabRow(selectedTabIndex = selectedTabIndex) {
+    PrimaryScrollableTabRow(
+      selectedTabIndex = selectedTabIndex
+    ) {
       TAB_TITLES.forEachIndexed { index, title ->
-        Tab(selected = selectedTabIndex == index, onClick = {
+        Tab(selected = selectedTabIndex == index,
+          enabled = !inProgress,
+          onClick = {
             // Clear input when tab changes.
             curTextInputContent = ""
             // Reset full prompt switch.
@@ -140,7 +151,13 @@ fun PromptTemplatesPanel(
               model = model,
               promptTemplateType = promptTemplateTypes[index]
             )
-        }, text = { Text(text = title) })
+          },
+          text = {
+            Text(
+              text = title,
+              modifier = Modifier.alpha(if (inProgress) 0.5f else 1f)
+            )
+          })
       }
     }
 
@@ -178,6 +195,13 @@ fun PromptTemplatesPanel(
           modifier = Modifier
             .fillMaxSize()
             .verticalScroll(rememberScrollState())
+            .clickable(
+              interactionSource = interactionSource,
+              indication = null // Disable the ripple effect
+            ) {
+              // Request focus on the TextField when the Column is clicked
+              focusRequester.requestFocus()
+            }
         ) {
           if (inputEditorValues[FULL_PROMPT_SWITCH_KEY] as Boolean) {
             Text(
@@ -186,7 +210,7 @@ fun PromptTemplatesPanel(
               modifier = Modifier
                 .fillMaxWidth()
                 .padding(16.dp)
-                .padding(bottom = 32.dp)
+                .padding(bottom = 40.dp)
                 .clip(MessageBubbleShape(radius = bubbleBorderRadius))
                 .background(MaterialTheme.customColors.agentBubbleBgColor)
                 .padding(16.dp)
@@ -205,7 +229,9 @@ fun PromptTemplatesPanel(
               ),
               textStyle = MaterialTheme.typography.bodyMedium,
               placeholder = { Text("Enter content") },
-              modifier = Modifier.padding(bottom = 32.dp)
+              modifier = Modifier
+                .padding(bottom = 40.dp)
+                .focusRequester(focusRequester)
             )
           }
         }
@@ -301,6 +327,7 @@ fun PromptTemplatesPanel(
           OutlinedIconButton(
             enabled = !inProgress && curTextInputContent.isNotEmpty(),
             onClick = {
+              focusManager.clearFocus()
               onSend(fullPrompt.text)
             },
             colors = IconButtonDefaults.iconButtonColors(