add compose

.idea/deploymentTargetSelector.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

app/build.gradle.kts

@@ -49,6 +49,9 @@ dependencies {
     implementation(libs.androidx.ui.graphics)
     implementation(libs.androidx.ui.tooling.preview)
     implementation(libs.androidx.material3)
+
+    implementation(libs.androidx.material.icons.extended)
+
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)

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

@@ -1,16 +1,43 @@
 package com.example.basicscodelab
 
+import android.content.res.Configuration.UI_MODE_NIGHT_YES
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.animation.animateContentSize
+import androidx.compose.animation.core.Spring
+import androidx.compose.animation.core.spring
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material.icons.Icons.Filled
+import androidx.compose.material.icons.filled.ExpandLess
+import androidx.compose.material.icons.filled.ExpandMore
+import androidx.compose.material3.Button
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
 import com.example.basicscodelab.ui.theme.BasicsCodelabTheme
 
 class MainActivity : ComponentActivity() {
@@ -20,8 +47,7 @@ class MainActivity : ComponentActivity() {
         setContent {
             BasicsCodelabTheme {
                 Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
-                    Greeting(
-                        name = "Android",
+                    MyApp(
                         modifier = Modifier.padding(innerPadding)
                     )
                 }
@@ -31,17 +57,137 @@ class MainActivity : ComponentActivity() {
 }
 
 @Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Hello $name!",
-        modifier = modifier
-    )
+fun MyApp(modifier: Modifier = Modifier) {
+
+    var shouldShowOnboarding by rememberSaveable { mutableStateOf(true) }
+
+    Surface(modifier) {
+        if (shouldShowOnboarding) {
+            OnboardingScreen(onContinueClicked = { shouldShowOnboarding = false })
+        } else {
+            Greetings()
+        }
+    }
+}
+
+@Composable
+private fun Greetings(
+    modifier: Modifier = Modifier,
+    names: List<String> = List(1000) { "$it" }
+) {
+    LazyColumn(modifier = modifier.padding(vertical = 4.dp)) {
+        items(items = names) { name ->
+            Greeting(name = name)
+        }
+    }
+}
+
+@Composable
+private fun Greeting(name: String, modifier: Modifier = Modifier) {
+    Card(
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.primary
+        ),
+        modifier = modifier.padding(vertical = 4.dp, horizontal = 8.dp)
+    ) {
+        CardContent(name)
+    }
+}
+
+@Composable
+private fun CardContent(name: String) {
+    var expanded by rememberSaveable { mutableStateOf(false) }
+
+    Row(
+        modifier = Modifier
+            .padding(12.dp)
+            .animateContentSize(
+                animationSpec = spring(
+                    dampingRatio = Spring.DampingRatioMediumBouncy,
+                    stiffness = Spring.StiffnessLow
+                )
+            )
+    ) {
+        Column(
+            modifier = Modifier
+                .weight(1f)
+                .padding(12.dp)
+        ) {
+            Text(text = "Hello, ")
+            Text(
+                text = name, style = MaterialTheme.typography.headlineMedium.copy(
+                    fontWeight = FontWeight.ExtraBold
+                )
+            )
+            if (expanded) {
+                Text(
+                    text = ("Composem ipsum color sit lazy, " +
+                            "padding theme elit, sed do bouncy. ").repeat(4),
+                )
+            }
+        }
+        IconButton(onClick = { expanded = !expanded }) {
+            Icon(
+                imageVector = if (expanded) Filled.ExpandLess else Filled.ExpandMore,
+                contentDescription = if (expanded) {
+                    stringResource(R.string.show_less)
+                } else {
+                    stringResource(R.string.show_more)
+                }
+            )
+        }
+    }
 }
 
 @Preview(showBackground = true)
 @Composable
+fun MyAppPreview() {
+    BasicsCodelabTheme {
+        MyApp(Modifier.fillMaxSize())
+    }
+}
+
+@Composable
+fun OnboardingScreen(
+    onContinueClicked: () -> Unit,
+    modifier: Modifier = Modifier
+) {
+
+    Column(
+        modifier = modifier.fillMaxSize(),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally
+    ) {
+        Text("Welcome to the Basics Codelab!")
+        Button(
+            modifier = Modifier
+                .padding(vertical = 24.dp),
+            onClick = onContinueClicked
+        ) {
+            Text("Continue")
+        }
+    }
+
+}
+
+@Preview(showBackground = true, widthDp = 320, heightDp = 320)
+@Composable
+fun OnboardingPreview() {
+    BasicsCodelabTheme {
+        OnboardingScreen(onContinueClicked = {}) // Do nothing on click.
+    }
+}
+
+@Preview(
+    showBackground = true,
+    widthDp = 320,
+    uiMode = UI_MODE_NIGHT_YES,
+    name = "GreetingPreviewDark"
+)
+@Preview(showBackground = true, widthDp = 320)
+@Composable
 fun GreetingPreview() {
     BasicsCodelabTheme {
-        Greeting("Android")
+        Greetings()
     }
 }

app/src/main/java/com/example/basicscodelab/ui/theme/Color.kt

@@ -8,4 +8,9 @@ val Pink80 = Color(0xFFEFB8C8)
 
 val Purple40 = Color(0xFF6650a4)
 val PurpleGrey40 = Color(0xFF625b71)
-val Pink40 = Color(0xFF7D5260)
+val Pink40 = Color(0xFF7D5260)
+
+val Navy = Color(0xFF073042)
+val Blue = Color(0xFF4285F4)
+val LightBlue = Color(0xFFD7EFFE)
+val Chartreuse = Color(0xFFEFF7CF)

app/src/main/java/com/example/basicscodelab/ui/theme/Theme.kt

@@ -9,18 +9,21 @@ import androidx.compose.material3.dynamicDarkColorScheme
 import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 
 private val DarkColorScheme = darkColorScheme(
-    primary = Purple80,
-    secondary = PurpleGrey80,
-    tertiary = Pink80
+    surface = Blue,
+    onSurface = Navy,
+    primary = Navy,
+    onPrimary = Chartreuse
 )
 
 private val LightColorScheme = lightColorScheme(
-    primary = Purple40,
-    secondary = PurpleGrey40,
-    tertiary = Pink40
+    surface = Blue,
+    onSurface = Color.White,
+    primary = LightBlue,
+    onPrimary = Navy
 
     /* Other default colors to override
     background = Color(0xFFFFFBFE),

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

@@ -1,3 +1,6 @@
 <resources>
     <string name="app_name">Basics Codelab</string>
+
+    <string name="show_less">Show less</string>
+    <string name="show_more">Show more</string>
 </resources>

gradle/libs.versions.toml

@@ -11,6 +11,7 @@ composeBom = "2024.04.01"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-material-icons-extended = { module = "androidx.compose.material:material-icons-extended" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
 androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
 androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }