appium Activity used to start app doesn't exist or cannot be launched 问题解决
运行appium测试报错 “error: Failed to start an Appium session, err was: Error: Activity used to start app doesn’t exist or cannot ve launched! Make usre it exists and is launchable activity”
网上很多说法是：“要打开的activity不存在，activity路径错误，改为完整正确的activity路径”
仔细检查了好几遍发现，activity是存在的，activity路径也是正确的（当然这么低端的问题一般人也不会犯）
经过一番查找，问题解决如下：
注释掉setup中的如下两行：
capabilities.setCapability("appPackage", "xxx.xxx.xxx.activity"); capabilities.setCapability("appActivity", ".MainActivity");
再次运行，问题解决了。
说明：说明运行测试的时候我们不需要指定package和activity 这些信息，Appium会从apk中提取这些信息。
见：https://github.com/appium/appium/issues/2981 中paymand 的解释：
Don't know about the apk info tool above, but you can always get that info using the aapt tool from Android SDK with the following command: adt/sdk/build-tools/android-4.4/aapt dump badging app.apk Note: You shouldn't need to specify appPackage, appActivity, etc. since Appium should be able to extract those from the apk using the method above anyway.
其他Appium的问题和技巧, 大家可以参考： Appium的一些坑问题错误解决 与 技巧集锦
