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Android UI : Tips and tricks.

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.

Efeturi Money

June 18, 2016
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  1. 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" ... />
  2. 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" ... />
  3. 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" ... />
  4. 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" ... />
  5. 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 -->
  6. 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"... />
  7. 1. Text 2. Icons 3. Images *drumroll* *ba dum tss*...

    4. Space 5. Layout! The most important elements to pay attention to
  8. 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
  9. Flat layout hierarchy and performance... Always aim for the flattest

    layout hierarchy to avoid heavy layout passes.
  10. 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(!)
  11. 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.
  12. 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>
  13. 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>
  14. 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
  15. 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
  16. Thank you! Feel free to contact me. Also join the

    Android Developer G+ group plus.google. com/communities/1051 53134372062985968