layout_example.kv

<ForBoxWidgetButton@Button>:  # ラベルのサンプルよう


#<HorizonalBoxWidget1>:
<HorizonalBoxWidget1@Widget>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: 'horizontal'
        Label:
            font_size: 30
            text: "タイトルラベル"
            color: 1, 0, 1,1    # 
            canvas.before:
                Color:
                    rgba: 0, 0, 0.5, 1
                Rectangle:
                    pos: self.pos
                    size: self.size


<HorizonalBoxWidget2@Widget>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: 'horizontal'

        Image:
            source:'fuukei1.jpg'

        Label:
            font_size: 30
            text: "ラベル1"
            color: 1, 1, 1,1    # 
            canvas.before:
                Color:
                    rgba: 0, 1, 0, 1
                Rectangle:
                    pos: self.pos
                    size: self.size

<HorizonalBoxWidget3@Widget>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: 'horizontal'
        Label:
            font_size: 30
            text: "ラベル2"
            color: 0, 0, 0,1
            canvas.before:
                Color:
                    rgba: 0, 1, 1, 1
                Rectangle:
                    pos: self.pos
                    size: self.size
        CheckBox:
            canvas.before:
                Color:
                    rgb: 0.2, 0.2, 0.2
                Rectangle:
                    pos: self.pos
                    size: self.size


        Button:
            font_size: 30
            text: "ボタン"
            background_color: 1,0.5,0.5,1
            color: 0,.3,2,1    # テキストのカラー,RGBA

<ExampleBoxWidget@Widget>:
    BoxLayout:
        size: root.size
        pos: root.pos

        orientation: 'vertical'
        HorizonalBoxWidget1:
        HorizonalBoxWidget2:
        HorizonalBoxWidget3:


<ExampleBoxWidget2@Widget>:
    BoxLayout:
        size: root.size
        pos: root.pos

        orientation: 'vertical'
        HorizonalBoxWidget1:
            size_hint_y: 0.1
        HorizonalBoxWidget2:
            size_hint_y: 0.4
        HorizonalBoxWidget3:
            size_hint_y: 0.5

<ExampleButton>
    BoxLayout:
        id: test1
        size: root.size
        pos: root.pos


        Label:
            font_size: 40
            text: root.labelText
            color: 0, 0, 0,1

        Button:
            text: "ボタン"
            #background_color: 0,0,1,1
            color: .5,.3,2,1
            font_size: 40
            on_press: root.buttonClic()
            on_release:  root.buttonRelease()