Android:How to add a button in surface view

Question

I\'m drawing some graphics and i would like to add a couple of buttons to it. But with the surface view how do we add these buttons programatically ?

Answer 1

Make your own button:

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.RectF;

    public class GButton
    {
        public Matrix btn_matrix = new Matrix();

        public RectF btn_rect;

        float width;
        float height;   
        Bitmap bg;

        public GButton(float width, float height, Bitmap bg)
        {
            this.width = width;
            this.height = height;
            this.bg = bg;

            btn_rect = new RectF(0, 0, width, height);
        }

        public void setPosition(float x, float y)
        {
            btn_matrix.setTranslate(x, y);
            btn_matrix.mapRect(btn_rect);
        }

        public void draw(Canvas canvas)
        {
            canvas.drawBitmap(bg, btn_matrix, null);
        }
    }

on touch event:

float x = ev.getX();
float y = ev.getY();
if (my_button.btn_rect.contains(x, y))
{
    // handle on touch here
}

alternatively, even better, if you want to also rotate the button it will not be axis-aligned, then use the invert matrix, instead of mapRect map the touch points x,y:

float pts[] = {x, y};            
my_button.invert_matrix.mapPoints(pts);           
if (my_button.btn_rect.contains(pts[0], pts[1])
{
    // handle on touch here
}