使用Jetpack Compose在Android中使用TextView

Jetpack撰写 是Google提供的新工具包。这对于设计漂亮的UI设计很有用。 Android TextView是Android中的简单视图，用于在我们的App中显示文本。在本文中，我们将介绍使用Jetpack Compose在Android中实现TextView的方法。

TextView小部件的属性

Attributes	Description
text	to set the text which we have to display inside our TextView.
style	to change the style of TextView in Android.
color	to change the color of TextView.
fontSize	to change the font size of our text.
fontWeight	to set the weight for our font ie. extra bold, dark, and many more
fontStyle	to set font style to italic.
fontFamily	to change the font family of our text.
letterSpacing	to set spacing in between letters of our TextView.
background	to set background color for our TextView.
shadow	to add shadow for our TextView.
textAlign	to change the alignment of our TextView.
modifier	the modifier is used to add padding to our TextView.

分步实施

步骤1：创建一个新项目

要在Android Studio Canary版本中创建新项目，请参阅如何使用Jetpack Compose在Android Studio Canary版本中创建新项目。

步骤2：在MainActivity.kt文件中添加TextView

导航到应用程序> Java >您的应用程序的程序包名称，然后打开MainActivity.kt文件。在该文件内，添加以下代码。在代码内部添加了注释，以更详细地了解代码。

Kotlin

package com.example.edittext
  
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.compose.foundation.layout.*
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shadow
import androidx.compose.ui.platform.setContent
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.TextUnit
  
import com.example.edittext.ui.EditTextTheme
  
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            EditTextTheme {
                // A surface container using the
                // 'background' color from the theme
                Surface(
                        // to add background color for our screen.
                        color = MaterialTheme.colors.background,
                ) {
                    // here we are calling our Composable
                    // function inside setContent method.
                    TextView()
                }
            }
        }
    }
}
  
// below is the Composable function
// which we have created for our TextView.
@Composable
fun TextView() {
    Column(
            // we are using column to align
            // our textview to center of the screen.
            modifier = Modifier.fillMaxWidth().fillMaxHeight(),
  
            // below line is used for specifying
            // vertical arrangement.
            verticalArrangement = Arrangement.Center,
  
            // below line is used for specifying
            // horizontal arrangement.
            horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        // TextView widget.
        androidx.compose.foundation.Text(
  
                // below line is for displaying
                // text in our text view.
                text = "Geeks for Geeks",
  
                // below line is used to add
                // style to our text view.
                style = TextStyle(
                        // color is used to provide green
                        // color to our text view.
                        color = Color.Green,
  
                        // font size to change the
                        // size of our text view.
                        fontSize = TextUnit.Sp(30),
  
                        // font weight to bold such as light bold,
                        // extra bold to our text view.
                        fontWeight = FontWeight.Black,
  
                        // font style is i=use to change style
                        // of our text view to italic and normal.
                        fontStyle = FontStyle.Italic,
  
                        // font family is use to change
                        // our font family to cursive.
                        fontFamily = FontFamily.Cursive,
  
                        // letter spacing i use to
                        // provide between letters.
                        letterSpacing = TextUnit.Companion.Sp(2),
  
                        // background is use to specify background
                        // color to our text view.
                        background = Color.White,
  
                        // shadow to make our
                        // text view elevated.
                        shadow = Shadow(color = Color.Gray),
  
                        // textALign to align our text view
                        // to center position.
                        textAlign = TextAlign.Center,
                        ),
                // modifier is use to give
                // padding to our text view.
                modifier = Modifier.padding(all = Dp(20.0F))
        )
    }
}
  
// @Preview function is use to see preview
// for our composable function in preview section.
@Preview
@Composable
fun DefaultPreview() {
    MaterialTheme {
        // we are passing our composable
        // function to display its preview.
        TextView()
    }
}

输出：

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