How to create a radial gradient programmatically in Android

activity_main.xml

 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity"     android:background="@android:color/white"     >     <ImageView         android:id="@+id/iv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Create GradientDrawable Radial"         android:layout_below="@id/iv"         /> </RelativeLayout> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.RelativeLayout; import android.graphics.drawable.GradientDrawable; import android.graphics.Color;  public class MainActivity extends Activity{      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         selesai ImageView iv = (ImageView) findViewById(R.id.iv);         Button btn = (Button) findViewById(R.id.btn);          // Set a click listener for Button widget         btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Initialize a new GradientDrawable                 GradientDrawable gd = new GradientDrawable();                  // Set the color array to draw gradient                 gd.setColors(new int[]{                         Color.RED,                         Color.WHITE,                         Color.YELLOW                 });                  // Set the GradientDrawable gradient type linear gradient                 gd.setGradientType(GradientDrawable.RADIAL_GRADIENT);                  /*                     setGradientRadius(float gradientRadius)                     Sets the radius of the gradient.                  */                 gd.setGradientRadius(150);                  /*                     setGradientCenter(float x, float y)                     Sets the center location of the gradient.                  */                 //gd.setGradientCenter(0,0);                  // Set GradientDrawable shape is a rectangle                 gd.setShape(GradientDrawable.RECTANGLE);                  // Set 2 pixels width solid black color border                 gd.setStroke(2, Color.BLACK);                  // Set GradientDrawable width and in pixels                 gd.setSize(200, 200); // Width 400 pixels and height 100 pixels                  // Set GradientDrawable as ImageView source image                 iv.setImageDrawable(gd);             }         });     } } 

More android examples

• How to set TextView text color transparent programmatically
• How to create a GradientDrawable programmatically
• How to load local HTML file with images into WebView
• How to create a horizontal layout RadioGroup
• How to set ListView alternate row color
• How to use AlertDialog onClickListener
• How to change EditText bottom border color
• How to delete an item from GridView
• DatePickerDialog example
• How to create a circle ProgressBar