flutter,how to place button at the bottom of the image?

Question

I'm creating the button over the image and i want the button at the bottom center of the image

Widget buildBody() {
  return Stack(
    children: <Widget> [
      Image(
        image: new AssetImage('assets/homebg.png'),
      ), 
      Center(
        child:  RaisedButton( 
          onPressed: () => launch("tel://21213123123"),
          child: new Text("Call me")
        )
      ),
    ]
  );     
}

I expect the output of button should be at the bottom of the image

Answer 1

Try to add alignment

Stack(
    alignment: Alignment.bottomCenter,
    children: <Widget>[
      Image(
        image: new AssetImage('assets/homebg.png'),
      ),
      Padding(
          padding: EdgeInsets.all(8.0),
          child: RaisedButton(
              onPressed: () => launch("tel://21213123123"),
              child: new Text("Call me")
          )
      ),
    ]
);

Answer 2

You can try to use the Positioned widget as a child of Stack.

Stack(
    children: [
        Image(...),
        Positioned(
            left: 0.0,
            right: 0.0,
            bottom: 0.0, 
            child: yourChildWidget(),
        )
    ]
)