查看appPackage和appActivity方法：
1.先在cmd命令行输入 adb logcat ActivityManager:I *:s
2.点击虚拟机启动app即可查看，/前是appPackage，/后是appActivity
其他方法见：https://blog.csdn.net/xl_lx/article/details/78717917
代码：
# -*- coding:UTF-8 -*-
from appium import webdriver
import time
#import unittest
desired_caps = {}
desired_caps['platformName'] = 'Android'
desired_caps['deviceName'] = 'Android Emulator'
desired_caps['platformVersion'] = '6.0'
desired_caps['appPackage'] = 'com.netease.cloudmusic'
desired_caps['appActivity'] = '.activity.LoadingActivity'
wd = webdriver.Remote("http://127.0.0.1:4723/wd/hub", desired_caps)
time.sleep(30); #睡眠30S等APP启动完成