appium 启动app失败

报错内容如下：
Activity used to start app doesn't exist or cannot be launched! Make sure it exists and is a launchable activity
发现只需要把启动方式替换成app就行了

desired_caps = {
                'platformName': 'Android',
                'deviceName': '12b8a7ca',
                'platformVersion': '5.0.2',
                'noReset':'true',

                'appPackage': 'com.tencent.mm',
                'appActivity': '.ui.LauncherUI',
                # 当通过appPackage和appActivity启动失败时可替换下面这种，注意需要把上面的方式给注释掉
                # 'app':'E:\\weixin_1220.apk',

                'unicodeKeyboard':'true',
                'resetKeyboard':'true',
                'chromeOptions':chrome_options_h5
                }