Android: How to use the onDraw method in a class extending Activity?

Question

As a beginner, I\'ve been building a simple counter application using a simple layout xml and a class called \'Counter\', which derives (extends) from the class Activity.

Answer 1

Couldn't you just place an ImageView next to your counter? You could do that in your xml layout file:

Or in your acrivity:

@Override
protected void onCreate(Bundle bundle) {
    // ...
    ImageView image = (ImageView) findViewById(R.id.my_image);
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.my_image);
    image.setImageBitmap(bitmap);
}

If you want to use a custom view and override the onDraw() method here's what you need to do:

class MyCustomView extends View {
    public MyCustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // your custom drawing
        canvas.drawRect(0, 0, 50, 50, new Paint());
    }
}

For any doubt, you can refer to Android Training