// GroupChatActivity.kt
   import android.os.Bundle
   import androidx.activity.compose.setContent
   import androidx.appcompat.app.AppCompatActivity
   import androidx.compose.foundation.background
   import androidx.compose.foundation.layout.Box
   import androidx.compose.foundation.layout.Column
   import androidx.compose.foundation.layout.Row
   import androidx.compose.foundation.layout.Spacer
   import androidx.compose.foundation.layout.fillMaxSize
   import androidx.compose.foundation.layout.fillMaxWidth
   import androidx.compose.foundation.layout.height
   import androidx.compose.foundation.layout.navigationBarsPadding
   import androidx.compose.foundation.layout.padding
   import androidx.compose.foundation.layout.statusBarsPadding
   import androidx.compose.foundation.layout.width
   import androidx.compose.material3.HorizontalDivider
   import androidx.compose.material3.Text
   import androidx.compose.runtime.getValue
   import androidx.compose.runtime.mutableStateOf
   import androidx.compose.runtime.setValue
   import androidx.compose.ui.Alignment
   import androidx.compose.ui.Modifier
   import androidx.compose.ui.text.font.FontWeight
   import androidx.compose.ui.unit.dp
   import androidx.compose.ui.unit.sp
   import io.trtc.tuikit.atomicx.basecomponent.theme.LocalTheme
   import io.trtc.tuikit.atomicx.messageinput.ui.MessageInput
   import io.trtc.tuikit.atomicx.messagelist.ui.MessageList
   import io.trtc.tuikit.atomicxcore.api.CompletionHandler
   import io.trtc.tuikit.atomicxcore.api.login.LoginStore

   class GroupChatActivity : AppCompatActivity() {

       private val sdkAppID: Int = 1234567890 // TODO: Fill in the sdkAppID here
       private val senderUserID = "" // TODO: Fill in your userID here
       private val senderUserSig = "" // TODO: Fill in your generated userSig here
       private val groupID = "" // TODO: Fill in the groupID here

       // C2C conversationID: "c2c_${userID}", Group conversationID: "group_${groupID}"
       private val conversationID: String get() = "group_${groupID}"

       override fun onCreate(savedInstanceState: Bundle?) {
           super.onCreate(savedInstanceState)
           login()
       }

       private fun login() {
           LoginStore.shared.login(this, sdkAppID, senderUserID, senderUserSig, object : CompletionHandler {
               override fun onSuccess() {
                   showGroupChatPage()
               }
               override fun onFailure(code: Int, desc: String) {
                   // Handle login failure
               }
           })
       }

       private fun showGroupChatPage() {
           setContent {
               val colors = LocalTheme.current.colors
               Column(
                   modifier = Modifier
                       .fillMaxSize()
                       .background(color = colors.bgColorOperate)
                       .statusBarsPadding()
               ) {
                   // Navigation Bar
                   Row(
                       modifier = Modifier
                           .fillMaxWidth()
                           .padding(horizontal = 16.dp)
                           .height(44.dp),
                       verticalAlignment = Alignment.CenterVertically
                   ) {
                       Text(
                           text = groupID,
                           fontSize = 17.sp,
                           fontWeight = FontWeight.W600,
                           color = colors.textColorPrimary
                       )
                   }

                   HorizontalDivider(color = colors.strokeColorPrimary)

                   // MessageList
                   Box(modifier = Modifier.weight(1f)) {
                       MessageList(
                           conversationID = conversationID,
                           onUserClick = { userID ->
                               // Handle user avatar click
                           }
                       )
                   }
                   // MessageInput
                   MessageInput(
                       conversationID = conversationID,
                       modifier = Modifier.navigationBarsPadding()
                   )
               }
           }
       }
   }