各位好，
我这边有个诡异的问题：
这几天 appium 运行 android 和 ios 真机都调试通过，但是今天运行 android 脚本，appium 运行到找到 device 那步就不继续执行了。
如下，接着就是反复的等待状态了：
debug: Using fast reset? true
debug: executing: "/Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb" devices
info: Creating new appium session a6fed93c-629d-4dd4-bf8f-75cb7afb6938
info: Starting android appium
info: Preparing device for session
info: Checking whether app is actually present
info: Checking whether adb is present
info: [ADB] Using adb from /Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb
info: Trying to find a connected android device
info: [ADB] Getting connected devices...
info: [ADB] 1 device(s) connected
debug: Appium request initiated at /wd/hub/status
info: Responding to client with success: {"status":0,"value":{"build":{"version":"0.12.0","revision":"a9d21807874190ae6d19f8251375cfe4da7b2ae5"}},"sessionId":"a6fed93c-629d-4dd4-bf8f-75cb7afb6938"}
debug: Request received with params: {}
GET /wd/hub/status 200 1ms - 199b
debug: Appium request initiated at /wd/hub/status
info: Responding to client with success: {"status":0,"value":{"build":{"version":"0.12.0","revision":"a9d21807874190ae6d19f8251375cfe4da7b2ae5"}},"sessionId":"a6fed93c-629d-4dd4-bf8f-75cb7afb6938"}
debug: Request received with params: {}
GET /wd/hub/status 200 1ms - 199b
问题真的很诡异，android 突然就不好用了，只执行到了找到设备，就不往下执行了。大家是否遇到过这样的问题。。。。
接着补充下，设备的初始化：
PATH 为 apk 的路径
desired_caps = {}
desired_caps['device'] = 'Android'
desired_caps['browserName'] = ''
desired_caps['version'] = '4.2.1'
desired_caps['app'] = PATH
desired_caps['app-package'] = 'com.example.android.contactmanager'
desired_caps['app-activity'] = '.ContactManager'
self.driver = webdriver.Remote('http://localhost:4723/wd/hub', desired_caps)
好吧，一个偶然的机会功能恢复了。
android 手机没有连接电脑，运行脚本。会提示无法连接设备。这时再把手机连到电脑上，脚本顺利运行通过了。。。
#4 楼 @lihuazhang 偶然好用的情景是这样的：执行脚本的时候没连接手机，appium 一直在找设备，此时连接手机，脚本顺利向下执行了。然后，反复运行脚本，都没有问题。
可是，过了 1 个小时，又出现我描述的问题了，走到这步就不走了：
info: Creating new appium session 2b7aa45a-92de-4b89-a6b3-06504d3d0293
info: Starting android appium
info: Preparing device for session
info: Checking whether app is actually present
info: Checking whether adb is present
info: [ADB] Using adb from /Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb
info: Trying to find a connected android device
info: [ADB] Getting connected devices...
debug: executing: "/Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb" devices
info: [ADB] 1 device(s) connected
我之前保存了一份完整运行的日志，这步后面应该的步骤是：
debug: executing: "/Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb" -s 0149B2EC0C01900D wait-for-device
info: Setting device id to 0149B2EC0C01900D
info: [ADB] Waiting for device to be ready and to respond to shell commands (timeout = 5)
debug: executing: "/Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb" -s 0149B2EC0C01900D shell "echo 'ready'"
info: Starting logcat capture
debug: java -jar "/Applications/Appium.app/Contents/Resources/node_modules/appium/lib/devices/android/helpers/strings_from_apk.jar" "/Users/dongdaqing/Downloads/ContactManager.apk" "/tmp/com.example.android.contactmanager"
debug: executing: "/Users/dongdaqing/Documents/AndroidDevEnv/android-sdk-macosx/platform-tools/adb" -s 0149B2EC0C01900D push "/tmp/com.example.android.contactmanager/strings.json" /data/local/tmp
debug: Not uninstalling app since server not started with --full-reset
相当于不执行 adb -s device_id 安装 apk。
好苦恼。ios 没有问题
#4 楼 @lihuazhang 请问你遇到过这样的问题么，之前看过你一个帖子：http://testerhome.com/topics/153。里面提到了海信的手机无法识别，跟这个有关么？
我的测试机是三星的，在配置文件里面也加上了 id，还是不行