Question

I am new for android. I want to add image button in onDraw. I wonder if I can do like this. I don’t have compile error. But simulator says, “Unfortunately MyApp has stopped.”
My second question is how can I add button at x, y location in screen?
There is no location parameters in addView.

protected class MyLayout extends LinearLayout {
    ImageButton button;
    public MyLayout(Context context) {
        super(context);
        setWillNotDraw(false);
        button = new ImageButton(context);
        button.setImageBitmap(buttonBitmap); // buttonBitmap is loaded in onCreate
    }
    public void onDraw(Canvas canvas) {
        addView(button);
    }
}

Answer 1

I would not be adding a button to a custom linearlayout in the onDraw() override function. onDraw is called periodically (for example when the element is resized). So you will be adding the same button EACH time onDraw() is called. And you will get an error if you add the same item more than once.

What exactly are you trying to do? If you want to just add a button to a linear layout, you can do so without extending a layout.