how to start the app on power button press in android - events

I want to launch(open) my app on single click of power button of android phone, How we detect single click event on power button. I tried onKey event but it detect only long click not single click. Anybody, have any idea? is there any broadcast receiver method for that?

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Google one tap renderButton pop-up events

I'm using the google.accounts.id.renderButton() method with pop-up behavior.
When I click this button I get a pop-up opened.
Are there any onOpened and onClosed events I can subscribe to?

I can't click Webbrowser's Mobile Element

I want to click one but I couldn't click it with my standard code. You need to press F12 and select mobile emulator to see this mobile version of website. After then you can click button manually but you can't click it programmatically. I can't use API so I need to do it with web elements.
This is my standard code;
For Each obj1 In WebBrowser1.Document.GetElementsByTagName("div")
If (obj1.GetAttribute("class") = "_o5rm6 coreSpriteCameraInactive") Then
obj1.Click: Exit For
End If
Next
This is the button where I want to click:

What is the hype around the Windows Phone 8 back button?

I know how to implement the back button. My question is about the desired behaviour (as I experienced there is a hype around it that the good implementation of back button is required to sell the app in the store).
There is the official source:
http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff402536(v=vs.105).aspx#BKMK_BackButton
But I have never used a WP8 for more than 5 minutes. I understood that the "Windows" button/key is the same as android home and ios home buttons. Is it true, that the WP8 back should be the same as the android back? (Briefly navigate back through pages (screens/activities), dismiss alerts or cancel confirm popups, or if it is the first/only/final page/activity, the app should exit.)
As I experienced, there is a long-press on the back button, which brings up the app switcher (~ios double home). Is it true that I should not take care about of this button? Is the default behavoiur the same for the remaining buttons (windows, power off, camera (half and full), search)? Should I override them? Can I override them (I think I can use camera, but can I use volume controls for other purposes)?
The certification requirements lay out what the back button should do pretty well. In short, it sounds like how you described the Android back button - here are the relevant requirements:
(5.2.4.1) Pressing the Back button must return the app to the previous page or return to any previous page within the back stack.
(5.2.4.2) Pressing the Back button from the first screen of an app must close the app.
(5.2.4.3) If the current page displays a context menu or a dialog, the pressing of the Back button must close the menu or dialog and return the user to the screen where the context menu or dialog box was opened.
You don't have to handle triggering the long-press, nor do you need to handle navigation specifically (assuming you're using the NavigationService for page navigation.)
You can definitely override the camera button, but search, power, and volume are off limits.

Open application in windows phone by hold special button

I have an application and I want to open it by hold some special button on the phone (ex : camera button, power button...). Do you have some ideas or example code to solve it?
Unfortunately it isn't possible. On Windows Phone 7, the only physical buttons you can subscribe to are the back button and the camera button, and it's only when your application is running. So you can't launch an application that way.

Why BackKeyPress can not execute in WP7

I found a weird thing in WP7.When the virtual keyboard display in the page,the page's BackKeyPress event can't execute. Can anybody know why?
When the virtual keyboard display in the page, you Press the Back Device Button. Firstly the virtual keyboard will disappear. And if you press the Back Device Button again the BackKeyPress will fire.

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