Cambiar la pantalla de login de despues de iniciar sesion

app/build.gradle.kts

@@ -42,6 +42,7 @@ dependencies {
     implementation(platform(libs.androidx.compose.bom))
     implementation(libs.androidx.activity.compose)
     implementation(libs.androidx.compose.material3)
+    implementation(libs.androidx.compose.material.icons.extended)
     implementation(libs.androidx.compose.ui)
     implementation(libs.androidx.compose.ui.graphics)
     implementation(libs.androidx.compose.ui.tooling.preview)

app/src/main/java/com/example/saludapp/MainActivity.kt

@@ -4,15 +4,11 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.material3.Text
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
+import com.example.saludapp.ui.HomeScreen
 import com.example.saludapp.ui.LoginScreen
 import com.example.saludapp.ui.RegisterScreen
 import com.example.saludapp.ui.StartScreen
@@ -25,27 +21,30 @@ class MainActivity : ComponentActivity() {
         setContent {
             SaludappTheme {
                 var currentScreen by remember { mutableStateOf("start") }
+                var loggedInUserName by remember { mutableStateOf("") }
 
                 when (currentScreen) {
                     "start" -> StartScreen {
                         currentScreen = "login"
                     }
                     "login" -> LoginScreen(
-                        onLoginSuccess = { currentScreen = "home" },
+                        onLoginSuccess = { name ->
+                            loggedInUserName = name
+                            currentScreen = "home"
+                        },
                         onNavigateToRegister = { currentScreen = "register" }
                     )
                     "register" -> RegisterScreen(
                         onRegisterSuccess = { currentScreen = "login" },
                         onBackToLogin = { currentScreen = "login" }
                     )
-                    "home" -> {
-                        Box(
-                            modifier = Modifier.fillMaxSize(),
-                            contentAlignment = Alignment.Center
-                        ) {
-                            Text("Bienvenido a Saludapp")
+                    "home" -> HomeScreen(
+                        userName = loggedInUserName,
+                        onLogout = {
+                            loggedInUserName = ""
+                            currentScreen = "start"
                         }
-                    }
+                    )
                 }
             }
         }

app/src/main/java/com/example/saludapp/data/DatabaseHelper.kt

@@ -19,14 +19,14 @@ object DatabaseHelper {
         return digest.fold("") { str, it -> str + "%02x".format(it) }
     }
 
-    suspend fun validateLogin(user: String, pass: String): Boolean = withContext(Dispatchers.IO) {
+    suspend fun validateLogin(user: String, pass: String): String? = withContext(Dispatchers.IO) {
         var connection: Connection? = null
         try {
             Class.forName("org.mariadb.jdbc.Driver")
             connection = DriverManager.getConnection(URL, USER, PASSWORD)
             
             val hashedPass = hashPassword(pass)
-            val query = "SELECT COUNT(*) FROM usuarios WHERE (username = ? OR email = ?) AND password = ?"
+            val query = "SELECT nombre_completo FROM usuarios WHERE (username = ? OR email = ?) AND password = ?"
             connection.prepareStatement(query).use { statement ->
                 statement.setString(1, user)
                 statement.setString(2, user)
@@ -34,7 +34,7 @@ object DatabaseHelper {
                 
                 val resultSet = statement.executeQuery()
                 if (resultSet.next()) {
-                    return@withContext resultSet.getInt(1) > 0
+                    return@withContext resultSet.getString("nombre_completo") ?: user
                 }
             }
         } catch (e: Exception) {
@@ -46,7 +46,7 @@ object DatabaseHelper {
                 e.printStackTrace()
             }
         }
-        return@withContext false
+        return@withContext null
     }
 
     suspend fun registerUser(user: String, email: String, pass: String, fullName: String): Boolean = withContext(Dispatchers.IO) {

app/src/main/java/com/example/saludapp/ui/HomeScreen.kt

@@ -0,0 +1,121 @@
+package com.example.saludapp.ui
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.DirectionsRun
+import androidx.compose.material.icons.automirrored.filled.ExitToApp
+import androidx.compose.material.icons.filled.*
+import androidx.compose.material3.*
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun HomeScreen(userName: String, onLogout: () -> Unit) {
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text("Saludapp", fontWeight = FontWeight.Bold) },
+                actions = {
+                    IconButton(onClick = onLogout) {
+                        Icon(Icons.AutoMirrored.Filled.ExitToApp, contentDescription = "Cerrar sesión")
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MaterialTheme.colorScheme.primaryContainer,
+                    titleContentColor = MaterialTheme.colorScheme.onPrimaryContainer
+                )
+            )
+        }
+    ) { padding ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(padding)
+                .padding(16.dp)
+        ) {
+            Text(
+                text = "Hola, $userName 👋",
+                style = MaterialTheme.typography.headlineMedium,
+                fontWeight = FontWeight.Bold
+            )
+            Text(
+                text = "Aquí tienes tu resumen de hoy",
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+
+            Spacer(modifier = Modifier.height(24.dp))
+
+            LazyVerticalGrid(
+                columns = GridCells.Fixed(2),
+                horizontalArrangement = Arrangement.spacedBy(16.dp),
+                verticalArrangement = Arrangement.spacedBy(16.dp),
+                modifier = Modifier.fillMaxSize()
+            ) {
+                item {
+                    StatCard("Pasos", "8,432", Icons.AutoMirrored.Filled.DirectionsRun, MaterialTheme.colorScheme.primary)
+                }
+                item {
+                    StatCard("Sueño", "7h 20m", Icons.Default.Bedtime, MaterialTheme.colorScheme.secondary)
+                }
+                item {
+                    StatCard("Agua", "1.5L", Icons.Default.LocalDrink, MaterialTheme.colorScheme.tertiary)
+                }
+                item {
+                    StatCard("Calorías", "1,200 kcal", Icons.Default.Whatshot, MaterialTheme.colorScheme.error)
+                }
+                item {
+                    StatCard("Corazón", "72 bpm", Icons.Default.Favorite, MaterialTheme.colorScheme.primary)
+                }
+                item {
+                    StatCard("Peso", "70 kg", Icons.Default.MonitorWeight, MaterialTheme.colorScheme.secondary)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun StatCard(title: String, value: String, icon: ImageVector, color: androidx.compose.ui.graphics.Color) {
+    Card(
+        modifier = Modifier
+            .fillMaxWidth()
+            .height(140.dp),
+        colors = CardDefaults.cardColors(containerColor = color.copy(alpha = 0.1f))
+    ) {
+        Column(
+            modifier = Modifier
+                .padding(16.dp)
+                .fillMaxSize(),
+            verticalArrangement = Arrangement.SpaceBetween
+        ) {
+            Icon(
+                imageVector = icon,
+                contentDescription = null,
+                tint = color,
+                modifier = Modifier.size(32.dp)
+            )
+            Column {
+                Text(
+                    text = value,
+                    style = MaterialTheme.typography.titleLarge,
+                    fontWeight = FontWeight.Bold,
+                    color = color
+                )
+                Text(
+                    text = title,
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+        }
+    }
+}

app/src/main/java/com/example/saludapp/ui/LoginScreen.kt

@@ -11,7 +11,7 @@ import com.example.saludapp.data.DatabaseHelper
 import kotlinx.coroutines.launch
 
 @Composable
-fun LoginScreen(onLoginSuccess: () -> Unit, onNavigateToRegister: () -> Unit) {
+fun LoginScreen(onLoginSuccess: (String) -> Unit, onNavigateToRegister: () -> Unit) {
     var email by remember { mutableStateOf("") }
     var password by remember { mutableStateOf("") }
     var isLoading by remember { mutableStateOf(false) }
@@ -73,10 +73,10 @@ fun LoginScreen(onLoginSuccess: () -> Unit, onNavigateToRegister: () -> Unit) {
                     scope.launch {
                         isLoading = true
                         errorMessage = null
-                        val success = DatabaseHelper.validateLogin(email, password)
+                        val userName = DatabaseHelper.validateLogin(email, password)
                         isLoading = false
-                        if (success) {
-                            onLoginSuccess()
+                        if (userName != null) {
+                            onLoginSuccess(userName)
                         } else {
                             errorMessage = "Usuario o contraseña incorrectos"
                         }