我无法使用Appium + Java在Android的权限对话框中点击“拒绝”或“允许”按钮。在点击这些按钮之前，我需要添加任何功能吗？下面是代码：

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability("platformName", "Android");
capabilities.setCapability("deviceName", "ASUS_Z00LD");
capabilities.setCapability("platformVersion", "6.0");
capabilities.setCapability("app","<AppPath>");
capabilities.setCapability("browserName", "");
AndroidDriver<MobileElement> driver = new AndroidDriver<MobileElement>(new URL("http://127.0.0.1:4723/wd/hub"), capabilities);
        Thread.sleep(10000);
driver.findElement(MobileBy.id("permission_allow_button")).click();

以下是Eclipse控制台中的错误：

org.openqa.selenium.NoSuchElementException: An element could not be located on the page using the given search parameters. (WARNING: The server did not provide any stacktrace information)

以下是Appium日志：

info: [debug] Responding to client with success: {"status":0,"value":{"platform":"LINUX","browserName":"","platformVersion":"6.0.1","webStorageEnabled":false,"takesScreenshot":true,"javascriptEnabled":true,"databaseEnabled":false,"networkConnectionEnabled":true,"locationContextEnabled":false,"warnings":{},"desired":{"app":"/Users/Shiva/Documents/workspace/AndroidPractice/APK/****_Android.apk","browserName":"","platformName":"Android","deviceName":"ASUS_Z00LD","platformVersion":"6.0"},"app":"/Users/Shiva/Documents/workspace/AndroidPractice/APK/****_Android.apk","platformName":"Android","deviceName":"FAAZCY127084"},"sessionId":"b64fd5af-3de5-4299-a2d4-1948fc8e883e"}
info: <-- GET /wd/hub/session/b64fd5af-3de5-4299-a2d4-1948fc8e883e 200 1.534 ms - 625 {"status":0,"value":{"platform":"LINUX","browserName":"","platformVersion":"6.0.1","webStorageEnabled":false,"takesScreenshot":true,"javascriptEnabled":true,"databaseEnabled":false,"networkConnectionEnabled":true,"locationContextEnabled":false,"warnings":{},"desired":{"app":"/Users/Shiva/Documents/workspace/AndroidPractice/APK/****_Android.apk","browserName":"","platformName":"Android","deviceName":"ASUS_Z00LD","platformVersion":"6.0"},"app":"/Users/Shiva/Documents/workspace/AndroidPractice/APK/****_Android.apk","platformName":"Android","deviceName":"FAAZCY127084"},"sessionId":"b64fd5af-3de5-4299-a2d4-1948fc8e883e"}

info: --> POST /wd/hub/session/b64fd5af-3de5-4299-a2d4-1948fc8e883e/element {"using":"id","value":"permission_allow_button"}

info: [debug] Waiting up to 0ms for condition

info: [debug] Pushing command to appium work queue: ["find",{"strategy":"id","selector":"permission_allow_button","context":"","multiple":false}]
info: [debug] [BOOTSTRAP] [debug] Got data from client: {"cmd":"action","action":"find","params":{"strategy":"id","selector":"permission_allow_button","context":"","multiple":false}}
info: [debug] [BOOTSTRAP] [debug] Got command of type ACTION
info: [debug] [BOOTSTRAP] [debug] Got command action: find
info: [debug] [BOOTSTRAP] [debug] Finding permission_allow_button using ID with the contextId:  multiple: false
info: [debug] [BOOTSTRAP] [debug] Using: UiSelector[INSTANCE=0, RESOURCE_ID=com.****.****:id/permission_allow_button]

info: [debug] [BOOTSTRAP] [debug] Using: UiSelector[INSTANCE=0, RESOURCE_ID=android:id/permission_allow_button]

info: [debug] [BOOTSTRAP] [debug] Using: UiSelector[DESCRIPTION=permission_allow_button, INSTANCE=0]

info: [debug] [BOOTSTRAP] [debug] Failed to locate element. Clearing Accessibility cache and retrying.
info: [debug] [BOOTSTRAP] [debug] Finding permission_allow_button using ID with the contextId:  multiple: false
info: [debug] [BOOTSTRAP] [debug] Using: UiSelector[INSTANCE=0, RESOURCE_ID=com.****.****:id/permission_allow_button]

info: [debug] [BOOTSTRAP] [debug] Using: UiSelector[INSTANCE=0, RESOURCE_ID=android:id/permission_allow_button]

info: [debug] [BOOTSTRAP] [debug] Using: UiSelector[DESCRIPTION=permission_allow_button, INSTANCE=0]

info: [debug] [BOOTSTRAP] [debug] Returning result: {"status":7,"value":"No element found"}

info: [debug] Condition unmet after 178ms. Timing out.

info: [debug] Responding to client with error: {"status":7,"value":{"message":"An element could not be located on the page using the given search parameters.","origValue":"No element found"},"sessionId":"b64fd5af-3de5-4299-a2d4-1948fc8e883e"}
info: <-- POST /wd/hub/session/b64fd5af-3de5-4299-a2d4-1948fc8e883e/element 500 181.769 ms - 195

任何人为克服这一问题的帮助将不胜感激？