Android UI : Tips and tricks.

Slides for a presentation given at forLoop 2, an event where software developers come around to interact and share knowledge on different technologies.

Transcript

1. Android ∙ UI Tips & tricks Jun 18, 2016
2. Efeturi Money Android Developer / UI Enthusiast @efemoney_ @efemoney +EfeturiMoney
3. Important things to consider
4. The most important elements To pay attention to 1. Text 2. Icons 3. Images <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" ... />
5. 1. Text 2. Icons 3. Images The most important elements to pay attention to <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" ... /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/blah" android:scaleType="centerCrop" ... />
6. 1. Text 2. Icons 3. Images The most important elements to pay attention to <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" ... /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/blah" android:scaleType="centerCrop" ... />
7. 1. Text 2. Icons 3. Images *drumroll* *ba dum tss*... The most important elements to pay attention to <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" ... /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/blah" android:scaleType="centerCrop" ... />
8. 1. Text 2. Icons 3. Images *drumroll* *ba dum tss*... 4. Space! The most important elements to pay attention to A simple way to add spaces in your existing layouts <android.support.v4.widget.Space android:layout_width="match_parent" android:layout_height="8dp" /> <!-- From the v4 support library -->
9. 1. Text 2. Icons 3. Images *drumroll* *ba dum tss*... 4. Space! The most important elements to pay attention to Also set via view padding and layout_margins. <TextView ... android:paddingLeft="16dp" android:paddingRight="16dp" android:layout_margin="@dimen/text_margin"... />
10. Space is the difference between... A little more space makes your UI more usable and aesthetic
11. 1. Text 2. Icons 3. Images *drumroll* *ba dum tss*... 4. Space 5. Layout! The most important elements to pay attention to
12. 1. Text 2. Icons 3. Images *drumroll* *ba dum tss*... 4. Space 5. Layout 6. Color! The most important elements to pay attention to Color can be a powerful way of expressing brand and highlighting illustration in UI Check out material.google.com/style/color for more information
13. Avoiding common UI mistakes
14. Flat layout hierarchy and performance... Always aim for the flattest layout hierarchy to avoid heavy layout passes.
15. Flat layout hierarchy and performance... Reduce your number of views
16. Flat layout hierarchy and performance... Choose the right “Layout’ view subclass Especially apparent in adapterviews that can have thousands of items For example, a view inside a grid view inside a list view inside a relative layout could get laid out 8 times(!)
17. Use <include> & <merge> | Avoid <fragment>... <?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".ui.AlbumDetailsActivity"> <include layout="@layout/appbar" /> <FrameLayout android:id="@+id/frame" app:layout_behavior="@string/appbar_scrolling_view_behavior" android:layout_width="match_parent" android:layout_height="match_parent"/> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:src="@drawable/ic_add" app:backgroundTint="@color/colorFAB" app:rippleColor="@color/colorRippleLight" app:layout_anchor="@id/frame" app:layout_anchorGravity="bottom|right" android:layout_margin="@dimen/spacing_16" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </android.support.design.widget.CoordinatorLayout> Appbar is a great example of a widget you can reuse across your entire app.
18. Use <include> & <merge> | Avoid <fragment>... <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ImageView android:layout_width="fill_parent" android:layout_height="fill_parent" android:scaleType="center" android:src="@drawable/golden_gate" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="20dip" android:layout_gravity="center_horizontal|bottom" android:padding="12dip" android:background="#AA000000" android:textColor="#ffffffff" android:text="Golden Gate" /> </FrameLayout>
19. Use <include> & <merge> | Avoid <fragment>... <merge xmlns:android="http://schemas.android.com/apk/res/android"> <ImageView android:layout_width="fill_parent" android:layout_height="fill_parent" android:scaleType="center" android:src="@drawable/golden_gate" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="20dip" android:layout_gravity="center_horizontal|bottom" android:padding="12dip" android:background="#AA000000" android:textColor="#ffffffff" android:text="Golden Gate" /> </merge>
20. Some more tips... • Be weary of images. They can be a dream or a worst nightmare. Load images on a background thread or even better use an image loader Glide (personal fave) or Picasso • Eliminate unnecessary backgrounds
21. Stick to android patterns... Don’t try to port designs or UI components from iOS
22. Tools and libraries that help Some tools that help: • Use an image loading library (Glide/Picasso) • Hierarchy viewer • Lint warnings • Support library, compatible up to v7 (recently v9) • Butterknife
23. Codelab
24. #BuildBetterApps
25. Thank you! Feel free to contact me. Also join the Android Developer G+ group plus.google. com/communities/1051 53134372062985968