小编Ali*_*bek的帖子

我尝试运行此代码并在预览模式下查看它

package com.example.basiccodelab

import androidx.compose.ui.graphics.Color.Companion.Yellow
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Color.Companion.Yellow
import androidx.compose.ui.tooling.preview.Preview
import com.example.basiccodelab.ui.theme.BasicCodelabTheme

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            BasicCodelabTheme {
                // A surface container using the 'background' color from the theme
                Surface(color = MaterialTheme.colors.background) {
                    Greeting("Android")
                }
            }
        }
    }
}

@Composable
fun Greeting(name: String) {
    Surface(color = Color.Yellow) {
        Text(text = "Hello $name!")
    }
}

@Preview(showBackground = …