Kotlin中的TextView

Android TextView只是一个视图，用于向用户显示文本，并可以选择允许我们对其进行修改或编辑。首先，在Android Studio中打开Kotlin项目。
以下步骤用于在Kotlin中创建TextView ：

1. 在LinearLayout内的activity_main.xml文件中添加一个TextView。
2. 在activity_main.xml文件中添加诸如text，textColor，textSize，textStyle之类的属性。
3. 打开MainActivity.kt文件，并为TextView设置OnClickListner以显示Toast消息。

TextView小部件的不同属性–

Attributes	Description
android:text	Sets text of the Textview
android:id	Gives a unique ID to the Textview
android:cursorVisible	Use this attribute to make cursor visible or invisible. Default value is visible.
android:drawableBottom	Sets images or other graphic assets to below of the Textview.
android:drawableEnd	Sets images or other graphic assets to end of Textview.
android:drawableLeft	Sets images or other graphic assets to left of Textview.
android:drawablePadding	Sets padding to the drawable(images or other graphic assets) in the Textview.	android:autoLink	This attribute is used to automatically detect url or emails and show it as clickable link.
android:autoText	Automatically correct spelling errors in text of the Textview.
android:capitalize	It automatically capitalize whatever the user types in the Textview.
android:drawableRight	Sets drawables to right of text in the Textview.
android:drawableStart	Sets drawables to start of text in the Textview.
android:drawableTop	Sets drawables to top of text in the Textview.
android:ellipsize	Use this attribute when you want text to be ellipsized if it is longer than the Textview width.
android:ems	Sets width of the Textview in ems.
android:gravity	We can align text of the Textview vertically or horizontally or both.
android:height	Use to set height of the Textview.
android:hint	Use to show hint when there is no text.
android:inputType	Use to set input type of the Textview. It can be Number, Password, Phone etc.
android:lines	Use to set height of the Textview by number of lines.
android:maxHeight	Sets maximum height of the Textview.
android:minHeight	Sets minimum height of the Textview.
android:maxLength	Sets maximum character length of the Textview.
android:maxLines	Sets maximum lines Textview can have.
android:minLines	Sets minimum lines Textview can have.
android:maxWidth	Sets maximum width Textview can have.
android:minWidth	Sets minimum lines Textview can have.
android:textAllCaps	Show all texts of the Textview in capital letters.
android:textColor	Sets color of the text.
android:textSize	Sets font size of the text.
android:textStyle	Sets style of the text. For example, bold, italic, bolditalic.
android:typeface	Sets typeface or font of the text. For example, normal, sans, serif etc
android:width	Sets width of the TextView.

修改字符串.xml文件

我们可以在字符串.xml文件中添加字符串，并通过使用其名称来调用它们来轻松地在其他文件中使用。

    TextViewInKotlin
    GeeksForGeeks
    COMPUTER SCIENCE PORTAL

activity_main.xml文件

打开activity_main.xml文件，并使用id textView创建一个TextView。

打开MainActivity.kt文件并获取在布局文件中定义的TextView的引用。

// finding the textView
 val textView = findViewById(R.id.text_view_id) as TextView

将点击监听器设置为按钮

textView?.setOnClickListener{ Toast.makeText(this@MainActivity,
                "COMPUTER SCIENCE PORTAL", Toast.LENGTH_LONG).show() }

MainActivity.kt文件

打开app / src / main / Java/ yourPackageName /MainActivity.kt以获取TextView的引用。

package com.geeksforgeeks.myfirstkotlinapp
  
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import android.widget.Toast
  
class MainActivity : AppCompatActivity() {
  
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)
  
            //accessing our textview from layout
            val textView = findViewById(R.id.text_view_id) as TextView
            textView?.setOnClickListener{ Toast.makeText(this@MainActivity,
                R.string.text_on_click, Toast.LENGTH_LONG).show() }
        }
  
}

AndroidManifest.xml文件

我们还将看到main / AndroidManifest.xml文件中的代码。

作为仿真器运行以输出：

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