MainActivity.kt
package com.example.jetpack
import android.content.Context
import android.graphics.Color
import android.graphics.drawable.Drawable
import android.graphics.drawable.GradientDrawable
import android.os.Bundle
import android.util.TypedValue
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// add specified color border to edit text programmatically
editText.background = borderDrawable(
2.dpToPixels(applicationContext), Color.BLUE
)
// add border and background color to edit text programmatically
editText2.background = borderDrawable(
width = 2.dpToPixels(applicationContext),
color = Color.parseColor("#DA1884"),
bgColor = Color.WHITE
)
}
}
// extension function to generate a drawable to show border
fun borderDrawable(
width: Int = 10, // border width in pixels
color: Int = Color.BLACK, // border color
bgColor: Int = Color.TRANSPARENT // view background color
):Drawable{
return GradientDrawable().apply {
shape = GradientDrawable.RECTANGLE
setStroke(width, color)
setColor(bgColor)
}
}
// extension function to convert dp to equivalent pixels
fun Int.dpToPixels(context: Context):Int = TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, this.toFloat(), context.resources.displayMetrics
).toInt()
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FEFEFA"
tools:context=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginEnd="12dp"
android:inputType="text|textVisiblePassword"
android:padding="12dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.12" />
<EditText
android:id="@+id/editText2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="12dp"
android:inputType="text|textVisiblePassword"
android:padding="12dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText" />
</androidx.constraintlayout.widget.ConstraintLayout>

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