Jetpack Compose介绍

1.什么是compose？

Jetpack Compose 是 用于构建原生UI界面的新款Android工具包。

声明式UI

2.创建一个Compose项目

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3.项目结构

4.修改初始的主入口

package com.tiger.compose0117

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import com.tiger.compose0117.ui.theme.Compose0117Theme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
//            Compose0117Theme {
//                // A surface container using the 'background' color from the theme
//                Surface(
//                    modifier = Modifier.fillMaxSize(),
//                    color = MaterialTheme.colorScheme.background
//                ) {
//                    Greeting("Android")
//                }
//            }
            
            Greeting(name = "Compose Colin")
        }
    }
}

@Composable
fun Greeting(name: String, modifier: Modifier = Modifier) {
    Text(
        text = "Hello $name!",
        modifier = modifier
    )
}
//
//@Preview(showBackground = true)
//@Composable
//fun GreetingPreview() {
//    Compose0117Theme {
//        Greeting("Android")
//    }
//}

?5.一键启动

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