jetpack compose 在两个页面间切换

jetpack compose 在两个页面间切换：

创建两个Compose页面：定义两个简单的Composable函数，分别代表两个页面。

kotlin 复制代码

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.navigation.NavController

@Composable
fun FirstPage(navController: NavController) {
    Column(
        modifier = Modifier.fillMaxSize(),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    ) {
        Text("这是第一页")
        Button(onClick = { navController.navigate("second_page") }) {
            Text("去第二页")
        }
    }
}

@Composable
fun SecondPage(navController: NavController) {
    Column(
        modifier = Modifier.fillMaxSize(),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    ) {
        Text("这是第二页")
        Button(onClick = { navController.popBackStack() }) {
            Text("返回第一页")
        }
    }
}

设置导航图 ：使用NavHost和NavController来管理页面切换。

kotlin 复制代码

import androidx.compose.runtime.Composable
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import com.treevalue.jetsnack.pages.FirstPage
import com.treevalue.jetsnack.pages.SecondPage

@Composable
fun AppNavigation() {
    val navController = rememberNavController()
    NavHost(navController = navController, startDestination = "first_page") {
        composable("first_page") { FirstPage(navController) }
        composable("second_page") { SecondPage(navController) }
    }
}

在主活动中使用 ：主活动中调用AppNavigation。

kotlin 复制代码

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            AppNavigation()
        }
    }
}