Trabajo Android

app/build.gradle.kts

@@ -28,7 +28,7 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_11
+        sourceCompatibility =  JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
     }
     kotlinOptions {

app/src/main/java/es/fpsumma/dam2/intro/MainActivity.kt

@@ -9,6 +9,7 @@ import androidx.compose.material3.Surface
 import androidx.compose.ui.Modifier
 import com.ivancorrales.basicjetpackcompose.ui.theme.IntroTheme
 import es.fpsumma.dam2.intro.ui.screens.CounterScreen
+import es.fpsumma.dam2.intro.ui.screens.InputDemoScreen
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -19,7 +20,9 @@ class MainActivity : ComponentActivity() {
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colorScheme.background
                 ) {
-                    CounterScreen()
+                   // CounterScreen()
+                    InputDemoScreen()
+
                 }
            }
         }

app/src/main/java/es/fpsumma/dam2/intro/ui/screens/CounterScreen.kt

@@ -3,20 +3,23 @@ package es.fpsumma.dam2.intro.ui.screens
 import androidx.compose.foundation.layout.*
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.Refresh
-
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 
 
+
 @Composable
 fun CounterScreen() {
-    var count by remember { mutableStateOf(0) }
+    var count by rememberSaveable { mutableStateOf(5) }
+
 
     Column(
         modifier = Modifier
@@ -25,31 +28,59 @@ fun CounterScreen() {
         horizontalAlignment = Alignment.CenterHorizontally,
         verticalArrangement = Arrangement.spacedBy(16.dp)
     ) {
-        Text("Hola mi amig@!", style = MaterialTheme.typography.headlineMedium)
+        Text("Buenos_dias", style = MaterialTheme.typography.headlineMedium)
         Text("Contador: $count", style = MaterialTheme.typography.titleLarge)
+
+
         Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+
             Button(
-                onClick = {},
-                modifier = Modifier.semantics { contentDescription = "Incrementar" }
+                onClick = { count++ },
+                modifier = Modifier.semantics { contentDescription = "Incrementar" },
+                colors = ButtonDefaults.buttonColors(
+                    containerColor = Color.Green,
+                    contentColor = Color.White
+                )
             ) { Text("+1") }
 
             FilledTonalButton(
-                onClick = {},
+                onClick = {
+                    if (count > 0) {
+                        count--
+                    }
+                },
                 modifier = Modifier.semantics { contentDescription = "Decrementar" }
             ) { Text("-1") }
 
+
+
             IconButton(
-                onClick = {},
+                onClick = { count = 0 },
                 modifier = Modifier.size(48.dp)
             ) {
                 Icon(Icons.Outlined.Refresh, contentDescription = "Reiniciar contador")
+
             }
         }
+
+        // Botón con ancho que cambia según el contador
+            Button(
+                onClick = { },
+                modifier = Modifier
+                    .width(40.dp + (count * 10).dp)
+                    .height(48.dp),
+
+                ) {
+
+            }
     }
 }
 
 @Preview(showBackground = true)
 @Composable
-private fun CounterPreview() {
-    CounterScreen()
-}
+private fun CounterPreviewDark() {
+        CounterScreen()
+    }
+
+
+

app/src/main/java/es/fpsumma/dam2/intro/ui/screens/InputDemoScreen.kt

@@ -21,15 +21,20 @@ fun InputDemoScreen() {
 
     // Calcula el error en función del texto (sin estado extra) Pista -> derivedStateOf
     // TODO: valida name: no vacío, mínimo 3 caracteres (trim).
-    val error: String? by remember(name) {
+    val error: String? by remember(name) { //lo tienes que llamar name.trim por du funcion
         derivedStateOf {
-            null
+            if (name.trim().isEmpty()) {
+                "El nombre no puede estar vacío";
+            }else if (name.trim().length < 3) {
+                "El nombre debe tener al menos 3 caracteres";
+            }
+            else null
         }
     }
 
     fun submit() {
-        if (error == null) {
-            greeting = "Hola,  👋"
+        if (error == null && name.trim().isNotBlank()) {
+            greeting = "Hola, ${name.trim()} 👋"
             focusManager.clearFocus()
         }
     }
@@ -49,7 +54,8 @@ fun InputDemoScreen() {
         Spacer(Modifier.height(16.dp))
         Button(
             onClick = { submit() },
-            modifier = Modifier.fillMaxWidth()
+            modifier = Modifier.fillMaxWidth(),
+            enabled = error == null && name.trim().isNotBlank() // Hace que no te puede saludar porque desabilita si tiene alguno de los dos errores
         ) {
             Text("Saludar")
         }
@@ -62,4 +68,4 @@ fun InputDemoScreen() {
 
 @Preview(showBackground = true)
 @Composable
-private fun InputDemoPreview() { InputDemoScreen() }
+private fun InputDemoPreview() { InputDemoScreen() }

app/src/main/java/es/fpsumma/dam2/intro/ui/theme/Color.kt

@@ -8,4 +8,5 @@ val Pink80 = Color(0xFFEFB8C8)
 
 val Purple40 = Color(0xFF6650a4)
 val PurpleGrey40 = Color(0xFF625b71)
-val Pink40 = Color(0xFF7D5260)
+val Pink40 = Color(0xFF7D5260)
+

app/src/main/java/es/fpsumma/dam2/intro/ui/theme/Theme.kt

@@ -28,8 +28,8 @@ private val LightColorScheme = lightColorScheme(
 
 @Composable
 fun IntroTheme(
-    darkTheme: Boolean = false,
-    dynamicColor: Boolean = true,
+    darkTheme: Boolean = true,
+    dynamicColor: Boolean = false,
     content: @Composable () -> Unit
 ) {
     val colorScheme = when {

app/src/main/res/values/strings.xml

@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">Intro</string>
+    <string name="Buenos_dias">Intro</string>
 </resources>

gradle/libs.versions.toml

@@ -34,7 +34,7 @@ androidx-activity = { group = "androidx.activity", name = "activity", version.re
 androidx-constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
 
 [plugins]
-android-application = { id = "com.android.application", version.ref = "agp" }
+android-application = { id = "com.android.application",  version.ref = "agp" }
 kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
 kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Oct 15 11:01:44 CEST 2025
+#Mon Oct 20 13:02:11 CEST 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists