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Android. Fragment getActivity() sometimes returns null
... however some users get NullPointerException in fragment class when the getActivity() method is called.
8 Answers
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Android: how do I check if activity is running?
Is there any simple way of determining whether or not a certain activity is active?
I want to do certain things depending on which activity is active.
eg:
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How to prevent multiple instances of an Activity when it is launched with different Intents
... application menu of icons. This is leading to multiple copies of the same Activity being launched, which are conflicting with each other.
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Android - Back button in the title bar
...y apps (Calendar, Drive, Play Store) when you tap a button and enter a new activity, the icon in the title bar turns into a back button, but for the app I am making, it doesn't do that. How do I make that icon take you back to the previous screen?
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How to prevent the activity from loading twice on pressing the button
I am trying to prevent the activity from loading twice if I press the button twice instantly after the first click.
19 Answ...
Notification click: activity already open
I have an application with notifications that open a certain activity if I click them. I want that, if I click the notification and the activity is already opened, it's not started again, but just brought to front.
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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]
...network. I understand the need for aditional layers, but why are nonlinear activation functions used?
13 Answers
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Using Intent in an Android application to show another activity
In my Android application, I have two activity classes. I have a button on the first one and I want to show the second when it is clicked, but I get an error. Here are the classes:
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Calling startActivity() from outside of an Activity?
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Reload activity in Android
Is it a good practice to reload an Activity in Android ?
18 Answers
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