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Backward Compatibility
NineOldAndroids
NineOldAndroids
4500 Stars
Android library for using the Honeycomb (Android 3.0) animation API on all versions of the platform back to 1.0!
JakeWharton
HoloEverywhere
HoloEverywhere
2200 Stars
This project brings Holo Theme from Android 4.1 to 2.1 and above (no longer maintained).
Prototik
smooth-app-bar-layout
smooth-app-bar-layout
1800 Stars
Smooth version of Google Support Design AppBarLayout.
henrytao-me
android-switch-backport
android-switch-backport
505 Stars
A backport of the Switch widget (http://developer.android.com/reference/android/widget/Switch.html) that was introduced on Android 4. This port works on Android 2.1+.
BoD
android-support-v4-preferencefragment
android-support-v4-preferencefragment
389 Stars
Unofficial PreferenceFragment compatibility layer for Android 1.6 and up. Includes resources so add this as a library project to your project.
kolavar
streamsupport
streamsupport
324 Stars
Backport of Java 8 java.util.stream API to Java 6/7 and Android.
streamsupport
Android Device Compatibility Package
Android Device Compatibility Package
240 Stars
Android-Device-Compatibility just yet another compatibility package for Android. This project aims to make the app compatible with various devices all over the world. The project will take care about lots of issues caused by device differences, so you don't need to write a weird compatibility code on your own.
mixi-inc
android-calendarview
android-calendarview
222 Stars
Android CalendarView widget backported to 2.2 https://developer.android.com/reference/android/widget/CalendarView.html
SimonVT
AndroidLifecyle
AndroidLifecyle
150 Stars
AndroidLifecyle is a 'compatibility' version of the ActivityLifecycleCallbacks APIs that were introduced in Android 4 (API Level 14) and adding similar mechanism for Fragment.
soarcn
GreenMatter
GreenMatter
137 Stars
Android library to backport Material design and allow changing colors at run-time.
negusoft
Android-AccountChooser
Android-AccountChooser
68 Stars
Account Chooser for Android, backported from JellyBean.
frakbot
notification-channel-compat
notification-channel-compat
28 Stars
notification-channel-compat adds Notification Channels support to pre-Oreo Android devices. You use the same required coding as for the Android 8.0 built-in channel classes, with minimal change, to add channel support for your app, to any Android 4.0+ device. In Android 8.0+ it uses the built-in channel classes, and in pre-Android 8.0, it mimics them. This frees developer of dealing with notification preferences for older devices, and easily allowed multiple preferences for multiple channels.
lionscribe

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