diff --git a/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionFragment.kt b/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionFragment.kt
index ed14a22..f9fae6d 100644
--- a/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionFragment.kt
+++ b/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionFragment.kt
@@ -35,9 +35,11 @@ class ResolutionFragment : Fragment() {
     
     private lateinit var windowManager: WindowManager
 
+    private var userId = 0
+
     companion object {
         lateinit var iWindowManager: Any
-     lateinit var iUserManager: Any
+        lateinit var iUserManager: Any
     }
 
     override fun onCreateView(
@@ -57,6 +59,10 @@ class ResolutionFragment : Fragment() {
         resolutionViewModel.fetchScreenResolution(windowManager)
         resolutionViewModel.fetchUsers()
         
+        val textView = binding.textResolution
+        resolutionViewModel.text.observe(viewLifecycleOwner) {
+            textView.text = it
+        }
         val textHeight = binding.textHeight.editText!!
         val textWidth = binding.textWidth.editText!!
         val textDpi = binding.textDpi.editText!!
@@ -68,17 +74,20 @@ class ResolutionFragment : Fragment() {
         val chipGroup = binding.chipGroup
         resolutionViewModel.usersList.observe(viewLifecycleOwner) {
             Log.d("usersRecved", it.toString())
-            chipGroup.addView(Chip(chipGroup.context).apply {
-                text = "${it["name"]} (${it["id"]})"
-                isCheckable = true
-                isCheckedIconVisible = true
-            })
-        }
-        val textView = binding.textResolution
-        resolutionViewModel.text.observe(viewLifecycleOwner) {
-            textView.text = it
+            for (user in it) {
+                chipGroup.addView(Chip(chipGroup.context).apply {
+                    text = "${user["name"]} (${user["id"]})"
+                    isCheckable = true
+                    isCheckedIconVisible = true
+                })
+            }
         }
         
+        chipGroup.setOnCheckedChangeListener { group, index ->
+            Log.d("index", index.toString())
+            val currentUser = resolutionViewModel.usersList.value!![index] as Map<String, Any>
+            userId = currentUser["id"] as Int
+        }
         binding.btApply.setOnClickListener {
             applyResolution(textHeight.text.toString().toInt(),
               textWidth.text.toString().toInt(),
@@ -104,7 +113,6 @@ class ResolutionFragment : Fragment() {
           "setForcedDisplaySize", Display.DEFAULT_DISPLAY, width, height)
         
         // TODO: apply dpi for each user
-        val userId = 0
         HiddenApiBypass.invoke(iWindowManager::class.java, iWindowManager,
           "setForcedDisplayDensityForUser", Display.DEFAULT_DISPLAY, dpi, userId)
         
diff --git a/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionViewModel.kt b/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionViewModel.kt
index 9bbe962..e9f6596 100644
--- a/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionViewModel.kt
+++ b/app/src/main/java/top/jiecs/screener/ui/resolution/ResolutionViewModel.kt
@@ -37,8 +37,8 @@ class ResolutionViewModel : ViewModel() {
           "dpi" to 520)
     }
     
-    val usersList: MutableLiveData<Map<String, Any>> by lazy {
-        MutableLiveData<Map<String, Any>>()
+    val usersList: MutableLiveData<List<Map<String, Any>>> by lazy {
+        MutableLiveData<List<Map<String, Any>>>()
     }
     fun fetchUsers() { 
         val userManager = ResolutionFragment.iUserManager
@@ -61,14 +61,15 @@ class ResolutionViewModel : ViewModel() {
         
        // TODO
        
-       usersList.setValue(mapOf(
-           "id" to 0,
-           "name" to "jiesou"
-      ))
-      usersList.setValue(mapOf(
-           "id" to 10,
-           "name" to "second user"
-      ))
+        usersList.setValue(
+          listOf(mapOf(
+             "id" to 0,
+             "name" to "jiesou"
+          ), mapOf(
+             "id" to 10,
+             "name" to "second user")
+          )
+        )
     }
     
 }
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index 4cfc592..2c2f02d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '8.0.0' apply false
-    id 'com.android.library' version '8.0.0' apply false
+    id 'com.android.application' version '8.1.1' apply false
+    id 'com.android.library' version '8.1.1' apply false
     id 'org.jetbrains.kotlin.android' version '1.8.21' apply false     
 }