android - How to draw Rounded Rectangle on Canvas

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"     android:background="#c1cebe"     >     <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="Draw"         android:layout_alignParentRight="true"         android:layout_alignParentEnd="true"         android:layout_alignParentBottom="true"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcode;  import android.content.Context; import android.content.res.Resources; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; 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; import android.graphics.Canvas; import android.graphics.Bitmap;   public class MainActivity extends AppCompatActivity {     private Context mContext;     private Resources mResources;     private RelativeLayout mRelativeLayout;     private Button mButton;     private ImageView mImageView;      @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);         mButton = (Button) findViewById(R.id.btn);         mImageView = (ImageView) findViewById(R.id.iv);          // Set a click listener for Button widget         mButton.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Initialize a new Bitmap                 Bitmap bitmap = Bitmap.createBitmap(                         600, // Width                         300, // Height                         Bitmap.Config.ARGB_8888 // Config                 );                  // Initialize a new Canvas instance                 Canvas canvas = new Canvas(bitmap);                  // Draw a solid color on the canvas as background                 canvas.drawColor(Color.WHITE);                  // Initialize a new Paint instance to draw the rounded rectangle                 Paint paint = new Paint();                 paint.setStyle(Paint.Style.FILL);                 paint.setColor(Color.RED);                 paint.setAntiAlias(true);                  // Set an offset value in pixels to draw rounded rectangle on canvas                 int offset = 50;                  /*                     public RectF (float left, float top, float right, float bottom)                         Create a new rectangle with the specified coordinates. Note: no range                         checking is performed, so the caller must ensure that                         left <= right and top <= bottom.                      Parameters                         left  The X coordinate of the left side of the rectangle                         top  The Y coordinate of the top of the rectangle                         right  The X coordinate of the right side of the rectangle                         bottom  The Y coordinate of the bottom of the rectangle                 */                 // Initialize a new RectF instance                 RectF rectF = new RectF(                         offset, // left                         offset, // top                         canvas.getWidth() - offset, // right                         canvas.getHeight() - offset // bottom                 );                  /*                     public void drawRoundRect (RectF rect, float rx, float ry, Paint paint)                         Draw the specified round-rect using the specified paint. The roundrect                         will be filled or framed based on the Style in the paint.                      Parameters                         rect : The rectangular bounds of the roundRect to be drawn                         rx : The x-radius of the oval used to round the corners                         ry : The y-radius of the oval used to round the corners                         paint : The paint used to draw the roundRect                 */                  // Define the corners radius of rounded rectangle                 int cornersRadius = 25;                  // Finally, draw the rounded corners rectangle object on the canvas                 canvas.drawRoundRect(                         rectF, // rect                         cornersRadius, // rx                         cornersRadius, // ry                         paint // Paint                 );                  // Display the newly created bitmap on app interface                 mImageView.setImageBitmap(bitmap);             }         });     } }
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