MainActivity.kt
package com.example.jetpack
import android.graphics.Color
import android.graphics.drawable.GradientDrawable
import android.os.Bundle
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)
// set image view drawable liner gradient
imageView.setImageDrawable(linearGradientDrawable())
// set image view drawable radial gradient
imageView2.setImageDrawable(radialGradientDrawable())
// set image view drawable sweep gradient
imageView3.setImageDrawable(sweepGradientDrawable())
}
}
// method to generate linear gradient drawable
private fun linearGradientDrawable():GradientDrawable{
return GradientDrawable().apply {
colors = intArrayOf(
Color.parseColor("#008000"),
Color.parseColor("#8DB600"),
Color.parseColor("#D0FF14")
)
gradientType = GradientDrawable.LINEAR_GRADIENT
shape = GradientDrawable.RECTANGLE
orientation = GradientDrawable.Orientation.BOTTOM_TOP
// border around drawable
setStroke(5,Color.parseColor("#4B5320"))
}
}
// method to generate radial gradient drawable
private fun radialGradientDrawable():GradientDrawable{
return GradientDrawable().apply {
colors = intArrayOf(
Color.parseColor("#DA1884"),
Color.parseColor("#FFF600"),
Color.parseColor("#800020")
)
gradientType = GradientDrawable.RADIAL_GRADIENT
shape = GradientDrawable.RECTANGLE
gradientRadius = 350F
// border around drawable
setStroke(5,Color.parseColor("#CD5700"))
}
}
// method to generate sweep gradient drawable
private fun sweepGradientDrawable():GradientDrawable{
return GradientDrawable().apply {
colors = intArrayOf(
Color.parseColor("#00BFFF"),
Color.parseColor("#00CC99"),
Color.parseColor("#D70040"),
Color.parseColor("#F7E7CE"),
Color.parseColor("#DFFF00")
)
gradientType = GradientDrawable.SWEEP_GRADIENT
shape = GradientDrawable.RECTANGLE
// border around drawable
setStroke(5,Color.parseColor("#232B2B"))
}
}
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"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="@tools:sample/avatars" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Linear Gradient"
app:layout_constraintEnd_toEndOf="@+id/imageView"
app:layout_constraintStart_toStartOf="@+id/imageView"
app:layout_constraintTop_toBottomOf="@+id/imageView" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
tools:srcCompat="@tools:sample/avatars" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Radial Gradient"
app:layout_constraintEnd_toEndOf="@+id/imageView2"
app:layout_constraintStart_toStartOf="@+id/imageView2"
app:layout_constraintTop_toBottomOf="@+id/imageView2" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_marginStart="16dp"
android:layout_marginTop="24dp"
android:layout_marginEnd="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2"
tools:srcCompat="@tools:sample/avatars" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:text="Sweep Gradient"
app:layout_constraintEnd_toEndOf="@+id/imageView3"
app:layout_constraintStart_toStartOf="@+id/imageView3"
app:layout_constraintTop_toBottomOf="@+id/imageView3" />
</androidx.constraintlayout.widget.ConstraintLayout>

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