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What is the purpose of “android.intent.category.DEFAULT”?

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How to provide animation when calling another activity in Android?

I have two Activities A and B. I want to have the shrink Animation when Activity A calls B and maximize animation when Activity B calls A. I don't need the animation xml files for this. ...
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When and why should I use fragments in Android applications? [duplicate]

...ments can help. In most cases, I think it is quicker to create 2 different activities (e.g., 1 for tablets and 1 for handsets), and to share the common behaviors and events in a third class. ...
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How to pass a variable from Activity to Fragment, and pass it back?

I am currently making an android app, and I want to pass a date between activity and fragment. My activity has a button, which opens the fragment: DatePickerFragment. ...
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How to source virtualenv activate in a Bash script

How do you create a Bash script to activate a Python virtualenv? 9 Answers 9 ...
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Android: how to make an activity return results to the activity which calls it?

I have a Location activity that can be called from many activities, such as Sign up and Order . In the Location activity the user enters his location, so the activity Location will return this new location to that activity which called it. ...
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Determining the current foreground application from a background task or service

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Android: Temporarily disable orientation changes in an Activity

My main activity has some code that makes some database changes that should not be interrupted. I'm doing the heavy lifting in another thread, and using a progress dialog which I set as non-cancellable. However, I noticed that if I rotate my phone it restarts the activity which is REALLY bad for the...
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Background task, progress dialog, orientation change - is there any 100% working solution?

...sk ) and display a progress dialog while downloading. Orientation changes, Activity is restarted and then my AsyncTask is completed - I want to dismiss the progess dialog and start a new Activity. But calling dismissDialog sometimes throws an exception (probably because the Activity was destroyed an...