Create sample application that draw the circle, oval shape and square.

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Code:

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.pk.drawshapes">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        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>

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:id="@+id/activity_main"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.jayesh.drawshapes.MainActivity">

    <Button

        android:text="SQUARE"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_alignParentStart="true"

        android:layout_marginStart="12dp"

        android:id="@+id/btn_square" />

    <Button

        android:text="CIRCLE"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:id="@+id/btn_circle"

        android:layout_alignParentTop="true" />

    <Button

        android:text="RECTANGLE"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentEnd="true"

        android:layout_marginEnd="15dp"

        android:id="@+id/btn_rect"

        android:layout_alignParentTop="true" />

    <Button

        android:text="OVAL"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/btn_square"

        android:layout_alignEnd="@+id/btn_square"

        android:layout_marginTop="23dp"

        android:id="@+id/btn_oval" />

    <ImageView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        app:srcCompat="@android:drawable/ic_input_add"

        android:layout_below="@+id/btn_oval"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="152dp"

        android:id="@+id/iv" />

</RelativeLayout>

MainActivity.java

package com.jayesh.drawshapes;

import android.graphics.Color;

import android.graphics.drawable.ShapeDrawable;

import android.graphics.drawable.shapes.OvalShape;

import android.graphics.drawable.shapes.RectShape;

import android.graphics.drawable.shapes.Shape;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    private Button btn_square,btn_circle,btn_rect,btn_oval;

    ImageView iv;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btn_square = (Button)findViewById(R.id.btn_square);

        btn_circle = (Button)findViewById(R.id.btn_circle);

        btn_rect = (Button)findViewById(R.id.btn_rect);

        btn_oval = (Button)findViewById(R.id.btn_oval);

        iv = (ImageView)findViewById(R.id.iv);

        btn_square.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                ShapeDrawable square  = new ShapeDrawable(new RectShape());

                square.setIntrinsicHeight(500);

                square.setIntrinsicWidth(500);

                square.getPaint().setColor(Color.BLUE);

                iv.setImageDrawable(square);

            }

        });

        btn_rect.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                ShapeDrawable rect = new ShapeDrawable(new RectShape());

                rect.setIntrinsicHeight(500);

                rect.setIntrinsicWidth(250);

                rect.getPaint().setColor(Color.BLACK);

                iv.setImageDrawable(rect);

            }

        });

        btn_circle.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                ShapeDrawable circle = new ShapeDrawable(new OvalShape());

                circle.setIntrinsicHeight(500);

                circle.setIntrinsicWidth(500);

                circle.getPaint().setColor(Color.GREEN);

                iv.setImageDrawable(circle);

            }

        });

        btn_oval.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                ShapeDrawable oval = new ShapeDrawable(new OvalShape());

                oval.setIntrinsicHeight(500);

                oval.setIntrinsicWidth(300);

                oval.getPaint().setColor(Color.YELLOW);

                iv.setImageDrawable(oval);

            }

        });

    }

}

OUTPUT: