How to turn off Android phone programmatically?

I want to make a lock screen application. When the phone is in the lock mode, it will turn off the phone while the USB is plugged for prevent other users from accessing the phone data. Does anyone know how to turn off Android devices programmatically so other people can't access the data while 开发者_如何学Goa device on the lock mode?

here's the code to lock the home button on the lock screen activity:

@Override
public void onAttachedToWindow()
{   
    this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);     
    super.onAttachedToWindow();  
}

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It is impossible with the public Android SDK.

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Yes it is possible,

Using making system application(Using firmware) not download application. You can get the code for power off android device from AOSP.

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This is what can provide you an insight of the OS you are working on , and not about developing an app that would run on any device, as you have not made OS's for them.

Just pull a branch of android , customize it according to your wish and in your mainfest remove the filters, permissions that don't allow you to do that, or add your owns. Now , you have to play with the battery if I talk of more depth.

But if you just want to trigger the click on power off then its far simpler then.