Here I have created graphic app. In below example I have used android.graphics.Canvas. The android.graphics.Canvas provides method to draw oval,rectangle,text,picture etc.And The android.graphics.paint holds the information of color and style. Below example will described you how to make Graphics app.

Step(1)- activity_main.xml Layout-

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    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=".MainActivity" >  

    <TextView  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="Welcome Evon" />  

</RelativeLayout>  

Step(2)-MainActivity-

 public class MainActivity extends Activity {  

    RajView rajview;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        rajview = new RajView(this);  
        setContentView(rajview);  
    }  

    private class RajView extends View{  
        public RajView(Context context){  
            super(context);  
        }  

        @Override protected void onDraw(Canvas canvas) {  
            super.onDraw(canvas);  

            Paint paint = new Paint();  
            paint.setStyle(Paint.Style.FILL);  

            paint.setColor(Color.WHITE);  
            canvas.drawPaint(paint);  

            paint.setAntiAlias(false);  
            paint.setColor(Color.BLUE);  
            canvas.drawCircle(20, 20, 15, paint);  

            paint.setAntiAlias(true);  
            paint.setColor(Color.GREEN);  
            canvas.drawCircle(60, 20, 15, paint);  

            paint.setAntiAlias(false);  
            paint.setColor(Color.RED);  
            canvas.drawRect(100, 5, 200, 30, paint);  

            canvas.rotate(-45);  

            paint.setStyle(Paint.Style.FILL);  
            canvas.drawText("Graphics Rotation", 40, 180, paint);  

            canvas.restore();  
        }  
    }  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {    
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
}