How to add a shadow and a border on circular imageView android ?

This example demonstrates how to add a shadow and a border on circular imageView android

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
   android:layout_height="match_parent"
   android:id="@+id/rl"
   android:padding="16dp"
   tools:context=".MainActivity">
   <ImageView
      android:id="@+id/iv"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"/>
   <Button
      android:id="@+id/btn_circular"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Circular It"
      android:layout_alignParentBottom="true"
      android:layout_alignParentRight="true"/>
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

package com.app.sample;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.drawable.RoundedBitmapDrawable;
import androidx.core.graphics.drawable.RoundedBitmapDrawableFactory;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
   private Context mContext;
   private Resources mResources;
   private RelativeLayout mRelativeLayout;
   private Button mBTNCircular;
   private ImageView mImageView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      mContext = getApplicationContext();
      mResources = getResources();
      mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);
      mImageView = (ImageView) findViewById(R.id.iv);
      mBTNCircular = (Button) findViewById(R.id.btn_circular);
      final Bitmap srcBitmap = BitmapFactory.decodeResource(mResources, R.drawable.flower);
      mImageView.setImageBitmap(srcBitmap);
      mBTNCircular.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View view) {
            Paint paint = new Paint();
            int srcBitmapWidth = srcBitmap.getWidth();
            int srcBitmapHeight = srcBitmap.getHeight();
            int borderWidth = 25;
            int shadowWidth = 10;
            int dstBitmapWidth = Math.min(srcBitmapWidth,srcBitmapHeight)+borderWidth*2;
            Bitmap dstBitmap = Bitmap.createBitmap(dstBitmapWidth,dstBitmapWidth, Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(dstBitmap);
            canvas.drawColor(Color.WHITE);
            canvas.drawBitmap(srcBitmap, (dstBitmapWidth - srcBitmapWidth) / 2, (dstBitmapWidth - srcBitmapHeight) / 2, null);
            paint.setStyle(Paint.Style.STROKE);
            paint.setStrokeWidth(borderWidth * 2);
            paint.setColor(Color.WHITE);
            canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, canvas.getWidth() / 2, paint);
            paint.setColor(Color.LTGRAY);
            paint.setStrokeWidth(shadowWidth);
            canvas.drawCircle(canvas.getWidth()/2,canvas.getHeight()/2,canvas.getWidth()/2,paint);
            RoundedBitmapDrawable roundedBitmapDrawable = RoundedBitmapDrawableFactory.create(mResources, dstBitmap);
            roundedBitmapDrawable.setCircular(true);
            roundedBitmapDrawable.setAntiAlias(true);
            mImageView.setImageDrawable(roundedBitmapDrawable);
         }
      });
   }
}

Step 4 − Add the following code to Manifests/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.app.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
         <activity android:name=".MainActivity">
            <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity>
   </application>
</manifest>

OutPut

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −