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NullPointerException accessing views in onCreate()

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Force an Android activity to always use landscape mode

...C viewer is open source, I would like know how is it possible hard code an activity to be 'landscape'. I would like to change it to respect the phone orientation. ...
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Disable ActiveRecord for Rails 4

I want to disable ActiveRecord in Rails 4. I did the following in config/application.rb 8 Answers ...
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How to lock orientation during runtime

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android View not attached to window manager

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What is the difference between Fragment and FragmentActivity?

...differences, what are the main differences between Fragment and FragmentActivity ? To what scenarios are each class best suited? I'm trying to get an understanding of why both of these classes exist... ...
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What is 'Context' on Android?

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How to switch activity without animation in Android?

How can I use properly the Intent flag FLAG_ACTIVITY_NO_ANIMATION in AndroidManifest file? I supose my problem is trivial, but I can't find good example or solution to it. ...
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Fragment MyFragment not attached to Activity

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java.lang.RuntimeException: Unable to instantiate activity ComponentInfo

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