山东济南网站建设优化百度关键词关键词大全

用国内的通义灵码和codegeex都没有弄出来，最后只得用墙外的chatgpt才弄出一个满意的。kotlin真的有点难，好在有AI，让学习没这难了。

package com.example.mynumsetimport android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.gestures.snapping.rememberSnapFlingBehavior
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.mynumset.ui.theme.MyNumSetTheme
import kotlinx.coroutines.launch
import androidx.compose.ui.graphics.Colorclass MainActivity : ComponentActivity() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)enableEdgeToEdge()setContent {MyNumSetTheme {NumberPickerDemo()}}}
}@Composable
fun NumberPicker(modifier: Modifier = Modifier,initialValue: Int = 0,range: IntRange = 0..100,onValueChange: (Int) -> Unit
) {val itemHeight = 50.dpval listState = rememberLazyListState(initialFirstVisibleItemIndex = initialValue)val coroutineScope = rememberCoroutineScope()val itemHeightPx = with(LocalDensity.current) { itemHeight.toPx() }// 实时计算当前选中项索引val selectedIndex by remember {derivedStateOf {val offset = listState.firstVisibleItemScrollOffsetval index = listState.firstVisibleItemIndexif (offset > itemHeightPx / 2) index + 1 else index}}// 当滚动停止时，吸附到中间项并回调LaunchedEffect(listState.isScrollInProgress) {if (!listState.isScrollInProgress) {coroutineScope.launch {listState.animateScrollToItem(selectedIndex)}onValueChange(range.first + selectedIndex)}}LazyColumn(state = listState,modifier = modifier.height(itemHeight * 3).width(100.dp),horizontalAlignment = Alignment.CenterHorizontally,contentPadding = PaddingValues(vertical = itemHeight),flingBehavior = rememberSnapFlingBehavior(lazyListState = listState)) {items(range.count()) { index ->val value = range.first + indexval isSelected = selectedIndex == indexText(text = value.toString(),fontSize = if (isSelected) 32.sp else 20.sp,fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,color = if (isSelected) Color.Black else Color.Gray,modifier = Modifier.height(itemHeight).fillMaxWidth(),textAlign = TextAlign.Center)}}
}@Composable
fun NumberPickerDemo() {var selectedNumber by remember { mutableStateOf(50) }Column(modifier = Modifier.fillMaxSize(),verticalArrangement = Arrangement.Center,horizontalAlignment = Alignment.CenterHorizontally) {NumberPicker(initialValue = selectedNumber,onValueChange = { selectedNumber = it })Spacer(modifier = Modifier.height(16.dp))Text("当前选择: $selectedNumber", fontSize = 24.sp)}
}