Kotlin中的Android EditText

EditText用于从用户获取输入。 EditText通常在表单和登录或注册屏幕中使用。以下步骤用于在Kotlin中创建EditText：

1. 在activity_main.xml文件中添加一个EditText。
2. 在activity_main.xml文件中添加一个按钮。
3. 打开MainActivity.kt文件，并为按钮设置OnClickListner ，以从EditText获取用户输入，并将输入显示为Toast消息。

EditText小部件的不同属性–

XML Attributes	Description
android:id	Used to uniquely identify the control
android:gravity	Used to specify how to align the text like left, right, center, top, etc.
android:hint	Used to display the hint text when text is empty
android:text	Used to set the text of the EditText
android:textSize	Used to set size of the text.
android:textColor	Used to set color of the text.
android:textStyle	Used to set style of the text. For example, bold, italic, bolditalic etc.
android:textAllCaps	Used this attribute to show the text in capital letters.
android:width	It makes the TextView be exactly this many pixels wide.
android:height	It makes the TextView be exactly this many pixels tall.
android:maxWidth	Used to make the TextView be at most this many pixels wide.
android:minWidth	Used to make the TextView be at least this many pixels wide.
android:background	Used to set background to this View.
android:backgroundTint	Used to set tint to the background of this view.
android:clickable	Used to set true when you want to make this View clickable. Otherwise, set false.
android:drawableBottom	Used to set drawable to bottom of the text in this view.
android:drawableEnd	Used to set drawable to end of the text in this view.
android:drawableLeft	Used to set drawable to left of the text in this view.
android:drawablePadding	Used to set padding to drawable of the view.
android:drawableRight	Used to set drawable to right of the text in this view.
android:drawableStart	Used to set drawable to start of the text in this view.
android:drawableTop	Used to set drawable to top of the text in this view.
android:elevation	Used to set elevation to this view.

activity_main.xml文件

步骤1：打开activity_main.xml文件，并使用id editText创建一个EditText。

步骤2：在activity_main.xml文件中，添加代码以显示按钮。最终的activity_main.xml文件是

步骤3：打开MainActivity.kt文件并获取在布局文件中定义的Button和EditText的引用。

// finding the button
        val showButton = findViewById(R.id.showInput)
        
        // finding the edit text
        val editText = findViewById(R.id.editText)

将点击监听器设置为按钮

showButton.setOnClickListener {
            
        }

获取用户输入的文本

val text = editText.text

MainActivity.kt文件

最后，MainActivity.kt文件是

package com.geeksforgeeks.myfirstkotlinapp
  
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.Toast
  
class MainActivity : AppCompatActivity() {
  
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
  
        // finding the button
        val showButton = findViewById(R.id.showInput)
  
        // finding the edit text
        val editText = findViewById(R.id.editText)
  
        // Setting On Click Listener
        showButton.setOnClickListener {
  
            // Getting the user input
            val text = editText.text
  
            // Showing the user input
            Toast.makeText(this, text, Toast.LENGTH_SHORT).show()
        }
    }
}

AndroidManifest.xml文件

作为仿真器运行以输出

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