qt for android show Rectangle not true

[xueke]

Windows is normal, Android is very small and very careful to be seen. What should I do to be consistent with the size of the windows PC display?

[xueke]

import QtQuick 2.2
import QtQuick.Controls 1.1
import QtQuick.Layouts 1.0
import QtQuick.Window 2.2
ApplicationWindow {
    id:root;
    title: qsTr("Hello World")
    width: Screen.width
    height: Screen.height
    visible: true
    property real dpScale:  1.5;
    readonly property real dpi: Math.max(Screen.pixelDensity * 25.4 / 160 * dpScale, 1);
    Rectangle{
        anchors.fill:parent;
        z:1;
        RowLayout{
            spacing:1*dpi;
             anchors.bottom:parent.bottom;
            Rectangle{
                width:(Screen.width/3)*dpi;
                height:20*dpi;
                color:"blue";
                Image{

                }
            }
            Rectangle{
                width:(Screen.width/3)*dpi;
                height:20*dpi;
                color:"red";
                Image{

                }
            }
            Rectangle{
                width:(Screen.width/3)*dpi;
                height:20*dpi;
                color:"blue";
                Image{

                }
            }
        }
    }
}