android - How to create rounded corners ImageView

activity_main.xml 
 <?xml version="1.0" encoding="utf-8"?> <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"     >     <ImageView         android:id="@+id/iv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerInParent="true"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Rounded It"         android:layout_alignParentBottom="true"         android:layout_alignParentRight="true"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcode;  import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.support.v4.graphics.drawable.RoundedBitmapDrawable; import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.RelativeLayout;   public class MainActivity extends AppCompatActivity {     private Context mContext;     private Resources mResources;     private RelativeLayout mRelativeLayout;     private Button mBTN;     private ImageView mImageView;     private Bitmap mBitmap;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();          // Get the Resources         mResources = getResources();          // Get the widgets reference from XML layout         mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);         mImageView = (ImageView) findViewById(R.id.iv);         mBTN = (Button) findViewById(R.id.btn);          // Get the bitmap from drawable resources         mBitmap = BitmapFactory.decodeResource(mResources, R.drawable.avatar_girl);          // Display the bitmap in ImageView         mImageView.setImageBitmap(mBitmap);          // Set a click listener for Button widget         mBTN.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Define the ImageView corners radius                 float cornerRadius = 50.0f;                  /*                     RoundedBitmapDrawable                         A Drawable that wraps a bitmap and can be drawn with rounded corners. You                         can create a RoundedBitmapDrawable from a file path, an input stream, or                         from a Bitmap object.                 */                 /*                     RoundedBitmapDrawableFactory                         Constructs RoundedBitmapDrawable objects, either from Bitmaps directly, or                         from streams and files.                      public static RoundedBitmapDrawable create (Resources res, Bitmap bitmap)                         Returns a new drawable by creating it from a bitmap, setting initial target                         density based on the display metrics of the resources.                 */                 // Initialize a new RoundedBitmapDrawable object to make ImageView rounded corners                 RoundedBitmapDrawable roundedBitmapDrawable = RoundedBitmapDrawableFactory.create(                         mResources,                         mBitmap                 );                  // Set the RoundedBitmapDrawable corners radius                 roundedBitmapDrawable.setCornerRadius(cornerRadius);                  /*                     setAntiAlias(boolean aa)                         Enables or disables anti-aliasing for this drawable.                 */                 roundedBitmapDrawable.setAntiAlias(true);                  // Set the ImageView image as drawable object                 mImageView.setImageDrawable(roundedBitmapDrawable);             }         });     } }
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