Android how to create triangle and rectangle shape programmatically?

Question

How can we create ballon drawable shape as below. where we can change the color of it dynamically.

Answer 1

The clean and right way to do this whilst keeping it dynamic is to extend the View class.

Then in the onDraw you would do something like this:

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

    drawBackground(canvas);
}

private void drawBackground(Canvas canvas) {
    int width = (int) mWidth;
    int height = (int) mHeight;

    Point a = new Point(0, 0);
    Point b = new Point(width, 0);
    Point c = new Point(width, height - mPointHeight);//mPointedHeight is the length of the triangle... in this case we have it dynamic and can be changed.
    Point d = new Point((width/2)+(mPointedHeight/2), height - mPointHeight);
    Point e = new Point((width/2), height);// this is the sharp point of the triangle
    Point f = new Point((width/2)-(mPointedHeight/2), height - mPointHeight);
    Point g = new Point(0, height - mPointHeight);

    Path path = new Path();
    path.moveTo(a.x, a.y);
    path.lineTo(b.x, b.y);
    path.lineTo(c.x, c.y);
    path.lineTo(d.x, d.y);
    path.lineTo(e.x, e.y);
    path.lineTo(f.x, f.y);
    path.lineTo(g.x, g.y);

    canvas.drawPath(path, mPointedBackgroundPaint);// mPointedBackgroundPaint is whatever color you want as the fill.
}

There you go, no unnecessary layering or code that isn't dynamic or clean. You could also add the text in the box too.