The support you needShahar Barsheshet

About me

Shahar Barsheshet

shahar2k5

Talk agenda

● Intro to Support library

● How it works?

● Why should I use it?

● New cool features

Do you needsupport ???

The beginning

The Android support library was first release at 2011, bringing

support to thousands of devices, old as new.

The Goal: new API for old Android version

Starting with the famous v4.

Support Libraries

What’s inside?

palette

cardview

gridlayout

leanback

recycleview

mediarouter

appcompat

support-v4

multidex renderscript annotations

What’s inside?

ComponentsCompatibility

RecyclerViewCardViewViewPager

etc.

FragmentLoaders

AppCompatetc.

The Present● New features

● Fast Releases

● Bug fixes

● Respond to developers needs

# Design# Leanback# Wear# Percent# Preferences# UI# Utils

How it works?

How it works?

Intent myServiceIntent = new Intent();ContextCompat.startForegroundService(this, myServiceIntent);

package android.support.v4.content;

public static void startForegroundService(Context context, Intent intent) {if (Build.VERSION.SDK_INT >= 26) {

context.startForegroundService(intent);} else {

// Pre-O behavior.context.startService(intent);

}}

How it works?

Shims… That’s it?

Well… not quite...

How it works?

Fragments

How it works?

Fragments

IllegalStateException: Can not perform this

action after onSaveInstanceState

Calling FragmentTransaction#commit() after Activity’s onSaveInstanceState()

How it works?

Fragments

● Extra cautious when committing transaction in Activity’s lifecycle callbacks!

● Avoid committing in Asynchronous callbacks!

● Use commitAllowingStateLoss() only as a last resort!

Revision 24.0.0 - Added Fragment.commitNow() for synchronous commit.

Revision 25.1.1 - FragmentTransaction.setAllowOptimization(true)

Revision 25.4.0 - Transactions are not allowed during state change.

Revision 26.0.0 - setAllowOptimization(true):deprecated , isStateSaved():added.

Versioning…?

Remove a fragment from backstack and start a new Activity

Ref: https://issuetracker.google.com/issues/37129908

AppCompat

Support library gives us the option to use the same theme for devices with support for Material Design even below API 21.

This means that we can customize one theme to match almost all API levels.

In addition, we get to use some nice components that were added in API 21, like the Floating Action Button, Toolbar, DrawerLayout and more, out-of-the-box.

AppCompat

<resources>

<color name="primary">#3F51B5</color>

<color name="primary_dark">#303F9F</color>

<color name="accent">#FF4081</color>

</resources>

<resources>

<!-- Base application theme. -->

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

<!-- Customize your theme here. -->

<item name="android:colorPrimary">@color/primary</item>

<item name="android:colorPrimaryDark">@color/primary_dark</item>

<item name="android:colorAccent">@color/accent</item>

</style>

</resources>

style.xml

colors.xml

Material Design

<item name="colorPrimary">@color/primary</item>

<item name="android:colorPrimary">@color/primary</item>

!=

minSdkVersion="21"

Whats new?

public class CustomFontTextView extends TextView {

private void applyCustomFont(Context context) {Typeface customFont = FontCache.getTypeface("SourceSansPro-Regular.ttf", context);setTypeface(customFont);

}}

Whats new?

Downloadable fonts

dependencies {…compile "com.android.support:support-compat:26.0.1"

}

Whats new?

Downloadable fonts

● Shrink APK size

● Google fonts catalog - over 800 free fonts

● Android Studio integration

● Font caching across multiple apps

Whats new?

public class ResizableTextView extends TextView {

private void setText(String text) {// measure width and height// calculate text size to fit in view

}}

Whats new?

Whats new?

Whats new?

EmojiCompat

● Downloadable fonts

● Bundled fonts in the project

dependencies {…compile "com.android.support:support-emoji:26.0.1"

}

Whats new?

EmojiCompat - How it works

Whats new?

EmojiCompat

<android.support.text.emoji.widget.EmojiTextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"/>

<android.support.text.emoji.widget.EmojiEditTextandroid:layout_width="wrap_content"android:layout_height="wrap_content"/>

<android.support.text.emoji.widget.EmojiButtonandroid:layout_width="wrap_content"android:layout_height="wrap_content"/>

Versioning…?

Versioning…?

compile 'com.android.support:appcompat-v7:26.0.2'

compile 'com.android.support:support-v4:26.0.2'

compile 'com.android.support:cardview-v7:26.0.2'

compile 'com.android.support:design:26.0.2'

Versioning…?

groupId: com.android.support

artifactId: support-v4

version: 26.0.2

Gradle Dependencies

compile 'com.android.support:support-v4:26.0.2'

Maven

Versioning…?

compile 'com.android.support:support-v4:26.0.2'

Minimum supported API level

compile 'com.android.support:support-v4:26.0.2'

The library version - codebase wise

Versioning…?

android {

compileSdkVersion 26

}

dependencies {

compile "com.android.support:appcompat-v7:26.0.1"}

Support Library revision should be the same as the compiled sdk version

Versioning…?

compile 'com.android.support:appcompat-v7:25.+'DON’T!

compile 'com.android.support:appcompat-v7:26.0.1'compile 'com.android.support:design:25.0.1'

compile 'com.android.support:design:25.3.1'

DON’T!

WARNING!

Versioning…?

ext {

supportLibVersion = '26.0.2'

}

dependencies {

compile "com.android.support:appcompat-v7:${supportLibVersion}"

compile "com.android.support:design:${supportLibVersion}"

compile "com.android.support:support-annotations:${supportLibVersion}"

compile "com.android.support:support-vector-drawable:${supportLibVersion}"

compile "com.android.support:animated-vector-drawable:${supportLibVersion}"

}

TIP! Make your life easier, use a variable for the version

Versioning…?

Revision 26 -> min sdk v14

allprojects {repositories {

maven { url "https://maven.google.com" }}

}

When?

When?1. Targeting latest version but supporting older

versions with the same API’s.

2. Some components are only exists in the Support Libraries.

When?

When?

Well… Always…

Android, support me!

To sum it all up

● Use the support libraries!

● Do it right!

● Don’t re-invent the wheel

● Understand what you are doing (or at least try to)

● Bugs - don’t afraid to open!

?

Questions

Thanks!By the way

We are hiring!Shahar Barsheshet