diff --git a/app/build.gradle b/app/build.gradle index c35e5f3..2cd7e15 100644 --- a/app/build.gradle +++ b/app/build.gradle @@ -60,4 +60,7 @@ dependencies { androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version" debugImplementation "androidx.compose.ui:ui-tooling:$compose_version" debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version" + + implementation "androidx.navigation:navigation-compose:2.7.1" + } \ No newline at end of file diff --git a/app/src/main/java/com/lahsuak/apps/jetpackcomposebasic/MainActivity.kt b/app/src/main/java/com/lahsuak/apps/jetpackcomposebasic/MainActivity.kt index 187ee32..233b634 100644 --- a/app/src/main/java/com/lahsuak/apps/jetpackcomposebasic/MainActivity.kt +++ b/app/src/main/java/com/lahsuak/apps/jetpackcomposebasic/MainActivity.kt @@ -1,15 +1,34 @@ package com.lahsuak.apps.jetpackcomposebasic import android.os.Bundle +import android.widget.Space import androidx.activity.ComponentActivity import androidx.activity.compose.setContent +import androidx.compose.foundation.layout.Arrangement +import androidx.compose.foundation.layout.Box +import androidx.compose.foundation.layout.Column +import androidx.compose.foundation.layout.Spacer import androidx.compose.foundation.layout.fillMaxSize +import androidx.compose.foundation.layout.height +import androidx.compose.material3.Button import androidx.compose.material3.MaterialTheme import androidx.compose.material3.Surface import androidx.compose.material3.Text +import androidx.compose.material3.TextField import androidx.compose.runtime.Composable +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 androidx.compose.ui.graphics.Color import androidx.compose.ui.tooling.preview.Preview +import androidx.compose.ui.unit.dp +import androidx.navigation.NavController +import androidx.navigation.compose.NavHost +import androidx.navigation.compose.composable +import androidx.navigation.compose.rememberNavController import com.lahsuak.apps.jetpackcomposebasic.ui.theme.JetPackComposeBasicTheme class MainActivity : ComponentActivity() { @@ -22,29 +41,63 @@ class MainActivity : ComponentActivity() { modifier = Modifier.fillMaxSize(), color = MaterialTheme.colorScheme.background ) { - Greeting("Android") + val navController = rememberNavController() + NavHost( + navController = navController, + startDestination = "firstscreen" + ) { + composable("firstscreen") { + FirstScreen(navController) + } + composable("secondscreen") { + SecondScreen(navController) + } + } } } } } } -/*** -Composable functions : -A composable function is a regular function annotated with @Composable. -This enables your function to call other @Composable functions within it. -You can see how the Greeting function is marked as @Composable. -This function will produce a piece of UI hierarchy displaying the given input, -String. Text is a composable function provided by the library. -***/ + @Composable -fun Greeting(name: String) { - Text(text = "Hello $name!") +fun FirstScreen(navController: NavController) { + val msg = navController.currentBackStackEntry?.savedStateHandle?.get("msg") + Column( + Modifier.fillMaxSize(), + horizontalAlignment = Alignment.CenterHorizontally, + verticalArrangement = Arrangement.Center + ) { + Button(onClick = { navController.navigate("secondscreen") }) { + Text("Go to next screen") + } + Spacer(modifier = Modifier.height(8.dp)) + msg?.let { + Text(it) + } + } } -@Preview(showBackground = true) @Composable -fun DefaultPreview() { - JetPackComposeBasicTheme { - Greeting("Android") +fun SecondScreen(navController: NavController) { + var text by remember { + mutableStateOf("") + } + Column( + Modifier.fillMaxSize(), + horizontalAlignment = Alignment.CenterHorizontally, + verticalArrangement = Arrangement.Center + ) { + TextField( + value = text, onValueChange = { text = it }, + placeholder = { + Text("Enter text", color = Color.Gray) + }) + Spacer(Modifier.height(8.dp)) + Button(onClick = { + navController.previousBackStackEntry?.savedStateHandle?.set("msg", text) + navController.popBackStack() + }) { + Text(text = "Submit") + } } } \ No newline at end of file