How to draw using an xml layout in android
<p>I am trying to work through an android example given on the developers' page.
It gives 2 ways of drawing on a canvas. The first way is to use a class called CustomDrawableView, which looks like this:</p>

<pre><code>public class CustomDrawableView extends View {
private ShapeDrawable mDrawable;

public CustomDrawableView(Context context) {
super(context);

int x = 10;
int y = 10;
int width = 300;
int height = 50;

mDrawable = new ShapeDrawable(new OvalShape());
mDrawable.getPaint().setColor(0xff74AC23);
mDrawable.setBounds(x, y, x + width, y + height);
}

protected void onDraw(Canvas canvas) {
mDrawable.draw(canvas);
}
}
</code></pre>

<p>This is then called by the main class:</p>

<pre><code>CustomDrawableView mCustomDrawableView;
protected void onCreate(Bundle savedInstanceState) {    
super.onCreate(savedInstanceState);    
mCustomDrawableView = new CustomDrawableView(this);        
setContentView(mCustomDrawableView);
}
</code></pre>

<p>But then the tutorial says:</p>

<p>If you'd like to draw this custom drawable from the XML layout instead of from the Activity, then the CustomDrawable class must override the View(Context, AttributeSet) constructor, which is called when instantiating a View via inflation from XML. Then add a CustomDrawable element to the XML, like so:</p>

<pre><code>&lt;com.example.shapedrawable.CustomDrawableView
   android:layout_width="fill_parent"     
android:layout_height="wrap_content"     
/&gt;
</code></pre>

<p>I have successfully got the first example to run but I do not know what my code should look like if I want to adopt the second option. 
Presumably, I start with @Override View but then I am stuck.</p>

<p>The reason I want to do this is because I want to create a canvas that covers only part of the screen so I can fit buttons and text in the other part.</p>
