Qt 5.10 for Android StackView 响应系统返回键

    

    StackView {

          id: stackview

          anchors.fill: parent

          initialItem: "qrc:/main/Default.qml"

          focus: true

          Keys.enabled: true

          Keys.onBackPressed: {

              event.accepted = true;

              if((appIdentity === 0 & depth === 2) | (appIdentity === 1 & depth === 4))

              {

                    mainMessage.showMessage();

              }

              else

              {

                pop();

              }

          }
    }