Favorites?

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

@@ -1,5 +1,8 @@
 package com.example.ichwillheim
 
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
 import android.widget.Toast
 import androidx.activity.ComponentActivity
@@ -25,6 +28,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.example.ichwillheim.ui.theme.IchWillHeimTheme
+import androidx.core.net.toUri
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -43,14 +47,21 @@ class MainActivity : ComponentActivity() {
 @Composable
 fun LauncherScreen(modifier: Modifier = Modifier) {
     val context = LocalContext.current
+    val favorites = listOf(
+        FavoriteContact(
+            name = "Sandro",
+            phone = "+1-555-0100"
+        ),
+        FavoriteContact(
+            name = "Paulo",
+            phone = "+1-555-0111"
+        )
+    )
+
     val apps = listOf(
-        AppEntry(
-            label = "Phone",
-            packageName = "com.android.dialer"
-        ),
         AppEntry(
             label = "Messages",
-            packageName = "com.google.android.apps.messaging"
+            action = { openMessages(context) }
         )
     )
 
@@ -61,14 +72,25 @@ fun LauncherScreen(modifier: Modifier = Modifier) {
         verticalArrangement = Arrangement.Center,
         horizontalAlignment = Alignment.CenterHorizontally
     ) {
-        Text(
+        Text(text = "Favorites", style = MaterialTheme.typography.headlineSmall)
-            text = "Hallo Renate!",
+        Spacer(modifier = Modifier.height(16.dp))
-            style = MaterialTheme.typography.headlineSmall
+        favorites.forEach { favorite ->
-        )
+            Button(
-        Spacer(modifier = Modifier.height(24.dp))
+                onClick = { openDialerNumber(context, favorite.phone) },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(96.dp)
+            ) {
+                Text(text = favorite.name, fontSize = 24.sp)
+            }
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+        Spacer(modifier = Modifier.height(8.dp))
+        Text(text = "Apps", style = MaterialTheme.typography.headlineSmall)
+        Spacer(modifier = Modifier.height(16.dp))
         apps.forEach { app ->
             Button(
-                onClick = { launchApp(context, app) },
+                onClick = { app.action() },
                 modifier = Modifier
                     .fillMaxWidth()
                     .height(96.dp)
@@ -91,18 +113,33 @@ fun LauncherPreview() {
 @Immutable
 data class AppEntry(
     val label: String,
-    val packageName: String
+    val action: () -> Unit
 )
 
-private fun launchApp(context: android.content.Context, app: AppEntry) {
+@Immutable
-    val intent = context.packageManager.getLaunchIntentForPackage(app.packageName)
+data class FavoriteContact(
-    if (intent != null) {
+    val name: String,
+    val phone: String
+)
+
+private fun openDialerNumber(context: Context, phone: String) {
+    val intent = Intent(Intent.ACTION_DIAL).apply {
+        data = "tel:${Uri.encode(phone)}".toUri()
+    }
+    startIntentOrToast(context, intent, "Phone app not found")
+}
+
+private fun openMessages(context: Context) {
+    val intent = Intent(Intent.ACTION_SENDTO).apply {
+        data = "smsto:".toUri()
+    }
+    startIntentOrToast(context, intent, "Messages app not found")
+}
+
+private fun startIntentOrToast(context: Context, intent: Intent, error: String) {
+    try {
         context.startActivity(intent)
-    } else {
+    } catch (_: Exception) {
-        Toast.makeText(
+        Toast.makeText(context, error, Toast.LENGTH_SHORT).show()
-            context,
-            "App not found: ${app.label}",
-            Toast.LENGTH_SHORT
-        ).show()
     }
 }