Ứng dụng Android đầu tiên

Name: HelloWorld
Package name: com.example.helloworld
Save location: [Thư mục của bạn]
Language: Kotlin
Minimum SDK: API 24 (Android 7.0)
Build configuration: Kotlin DSL

HelloWorld/
├── app/
│   ├── src/main/
│   │   ├── java/com/example/helloworld/
│   │   │   └── MainActivity.kt
│   │   ├── res/
│   │   │   ├── drawable/
│   │   │   ├── values/
│   │   │   └── ...
│   │   └── AndroidManifest.xml
│   └── build.gradle.kts
├── gradle/
└── build.gradle.kts

package com.example.helloworld
 
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
 
class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MaterialTheme {
                Surface(modifier = Modifier.fillMaxSize()) {
                    Greeting("Android")
                }
            }
        }
    }
}
 
@Composable
fun Greeting(name: String, modifier: Modifier = Modifier) {
    Text(
        text = "Hello $name!",
        modifier = modifier
    )
}
 
@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    Greeting("Android")
}

class MainActivity : ComponentActivity()

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContent { ... }
}

@Composable
fun Greeting(name: String) {
    Text(text = "Hello $name!")
}

@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    Greeting("Android")
}

@Composable
fun Greeting(name: String, modifier: Modifier = Modifier) {
    Column(
        modifier = modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Text(
            text = "Hello $name!",
            fontSize = 24.sp,
            fontWeight = FontWeight.Bold
        )
        Text(
            text = "Chào mừng đến với Android",
            fontSize = 16.sp,
            color = Color.Gray
        )
    }
}

import androidx.compose.foundation.layout.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.sp

import android.util.Log
 
Log.d("MainActivity", "Debug message")
Log.i("MainActivity", "Info message")
Log.e("MainActivity", "Error message")