我在我的@Composable
函数中使用Scaffold
。在content = {
内部,我正在使用LazyColumn
。我想要将Top Start
和Top End
对齐到角落。就像这样:
期望输出
我尝试了从这里复制的这段代码,但它没有起作用。
package com.example.scrollcompose
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.Favorite
import androidx.compose.material.icons.filled.Menu
import androidx.compose.material3.*
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.scrollcompose.ui.theme.ScrollComposeTheme
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
ScrollComposeTheme {
// A surface container using the 'background' color from the theme
GreetingView()
}
}
}
}
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun GreetingView() {
val scrollBehavior = TopAppBarDefaults.exitUntilCollapsedScrollBehavior()
Scaffold(
topBar = {
MediumTopAppBar(
title = {
Text(
"Medium TopAppBar",
maxLines = 1,
overflow = TextOverflow.Ellipsis
)
},
navigationIcon = {
IconButton(onClick = { /* doSomething() */ }) {
Icon(
imageVector = Icons.Filled.Menu,
contentDescription = "Localized description"
)
}
},
actions = {
IconButton(onClick = { /* doSomething() */ }) {
Icon(
imageVector = Icons.Filled.Favorite,
contentDescription = "Localized description"
)
}
},
scrollBehavior = scrollBehavior
)
},
content = { innerPadding ->
LazyColumn(
modifier = Modifier
.clip(shape = RoundedCornerShape(15.dp, 15.dp, 0.dp, 0.dp))
.background(Color.Red),
contentPadding = innerPadding,
verticalArrangement = Arrangement.spacedBy(8.dp)
) {
val list = (0..40).map { it.toString() }
items(count = list.size) {
Text(
text = list[it],
style = MaterialTheme.typography.bodyLarge,
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 16.dp)
)
}
}
}
)
}
@Preview(showBackground = true)
@Composable
fun DefaultPreview() {
ScrollComposeTheme {
GreetingView()
}
}
实际输出