Android app with only a PreferenceScreen [closed] - android

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The app I'm currently developing is in dire need of a user interface. Currently, it is only a togglable service with no user interface. I want to incorporate an app that opens to a PreferenceScreen for it's MainActivity with a few options, and that's it. How would I approach that? (I have very little experience in user interface design for Android devices, and I've already checked this out.)

Check out PreferenceActivity. Its a preference screen built into Android that can read the settings in from xml and write the settings to a shared preference.

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I am writing an app in C++ that in has to lock the device at a specific moment in time, like if the user had pressed the lock button.
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I am getting installed widgets but I need to find out only running widgets of home screen. Is there any possible solution.
Thanks in advance.
Write your own home screen implementation, where you allow the user to add app widgets to that home screen. Then, you will know what the "running" app widgets are.
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All android apps in settings can be disabled. But I want to make an application which cant be disabled from settings. What can be done for that?
Nothing, because if it was possible, everyone would do it, and that would completely nullify the point of letting the user be the sole decision maker about disabling an app.

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We have created app, Now we need to provide Login With My App Functionality (Same like FB & Google+) in our app.
I want some guidance on that.
I've some idea that how to do it
IDEA
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Activity for different paid the application [closed]

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I would like to implement an activity with 3 button.
The first is for use the application for 0.99$
The second is for use the application with the default data for 4.99$
and the last button is for the buy the full application.
how can implement this? there are some examples like this?
thx
Google has a really handy tutorials for this:
An overview of Google's billing setup:
https://developer.android.com/google/play/billing/index.html?hl=az
Actually implementing it:
http://developer.android.com/google/play/billing/billing_integrate.html

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