if msg == "CAM1_Label_1":
  self.showCamOnTopScreen(0)
  self.device_listView.setCurrentIndex(0)

if msg == "CAM1_Label_1":
  self.showCamOnTopScreen(0)
  idx = self.devicelistModel.index(0)
  self.device_listView.setCurrentIndex(idx)

# QListView使用
from PyQt5.QtWidgets import QMessageBox, QListView, QStatusBar, QMenuBar, QMenu, QAction, QLineEdit, QStyle, \

  QFormLayout, QVBoxLayout, QWidget, QApplication, QHBoxLayout, QPushButton, QMainWindow, QGridLayout, QLabel
from PyQt5.QtGui import QIcon, QPixmap, QStandardItem, QStandardItemModel
from PyQt5.QtCore import QStringListModel, QAbstractListModel, QModelIndex, QSize
import sys
class WindowClass(QMainWindow):
  def __init__(self, parent=None):
    super(WindowClass, self).__init__(parent)
    self.layout = QVBoxLayout()
    self.resize(200, 300)
    listModel = QStringListModel()
    listView = QListView()
    items = ["step0", "step1", "step2", "step3"]
    listModel.setStringList(items)    
    listView.setModel(listModel)
    
    # 修改index的參數 ，即可指定當前的那個索引被選中
    listViewindex = listModel.index(1)
    
    listView.setCurrentIndex(listViewindex)
    listView.clicked.connect(self.checkItem)
    self.layout.addWidget(listView)
    widget = QWidget()
    widget.setLayout(self.layout)
    self.setCentralWidget(widget)
  def checkItem(self, index):
    QMessageBox.information(self, "ListView", "選擇項是：%d" % (index.row()))
if __name__ == "__main__":
  app = QApplication(sys.argv)
  win = WindowClass()
  win.show()
  sys.exit(app.exec_())