Android makes it easy to detect screen dimensions and pixel densities with resource selectors: resource folder names that provide alternate files to be used when certain conditions are satisfied. You can create alternative XML layout files, and then at runtime you can figure out what sort of screen is being used by finding whether certain view objects exist.
- [Instructor] I've previously described…how to measure the screen with Java code.…You can also detect screen dimensions…with resource selectors, that is resource folder names…that provide alternate files to be used…when certain conditions are satisfied.…In this project named DetectWithResources,…my MainActivity class opens…a layout file named activity_main.…That layout file includes a secondary layout file…called content_main, and that file contains a fragment.…
The fragment is named MainActivityFragment,…and it opens this layout file…that contains a TextView control.…When I run the app on both my tablet and my phone,…it looks exactly the same.…Now, I'm going to add some resources…to distinguish the two layouts.…I'll go to my project window and switch to the ProjectView,…so I can deal with the underlying file and folder structure.…Then I'll drill down to my Resource folder,…under Source, Main.…
I'll right-click and select New, Android Resource Directory.…I'll set the Resource Type to Layout,…and I'll set the name of the layout directory…
Author
David Gassner
Released
9/1/2016- Configuring Android Studio
- Understanding fragments
- Creating a fragment class and layout
- Adding and removing fragments with Java
- Creating layouts for multiple screens
- Understanding arguments and callback methods
- Passing arguments to a fragment
- Choosing layout at runtime
- Displaying dialogs with fragments
- Using fragments for managing dialogs, shared preferences, and more
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome1m 4s
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What you should know1m 50s
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Using the exercise files3m 44s
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1. Getting Started
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Understanding fragments3m 17s
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2. Display Fragments in Activities
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Display a fragment with XML3m 10s
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Add a fragment with Java3m 50s
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Remove a fragment with Java6m 12s
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3. Manage Fragments at Runtime
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Pass arguments to a fragment5m 18s
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Choose layout at runtime3m 21s
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4. Communication between Fragments and Activities
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5. Display Dialogs with Fragments
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Display a custom dialog5m 1s
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Pass arguments to the dialog4m 16s
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6. Other Uses of Fragments
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Create a ViewPager adapter4m 56s
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Conclusion
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Next steps1m 11s
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Video: Detect screen with resource selectors