targetingbackground
Implicit service intents are restricted
bindService with an implicit intent throws an exception.
What to doUse an explicit intent naming the package or component.
API 21 · LOLLIPOP
Android 5.0 Lollipop
Material Design
The story
Google had just announced Material Design, a unified visual language across products.
The problem
Dalvik's interpretation model limited performance and made the platform's runtime a liability on new hardware. 64-bit CPUs were arriving and Dalvik was not ready.
Lollipop replaced Dalvik with ART, added 64-bit support, brought Material Design, introduced JobScheduler and Project Volta, and made SELinux fully enforcing.
The largest single architectural change in Android's history.
What shipped
- Material Design
- ART replaces Dalvik as the default runtime
- 64-bit support
- Notifications on the lock screen
- Battery Saver
- Project Volta
Platform internals
What changed underneath the APIs. These are the changes this site's architecture modules explain in depth.
- ART becomes the only runtime: ahead-of-time compilation at install
- 64-bit ARM and x86 support
- RenderThread and OpenGL ES 3.1
- Project Volta and JobScheduler
- SELinux fully enforcing
What developers had to deal with
- JobScheduler
- android.hardware.camera2
- RecyclerView (support library)
- WebView via Play Store updates
- Implicit service intents restricted for targeting apps
Behaviour changes
The full archive has every recorded change with its migration advice.
Permissions introduced here
BIND_DREAM_SERVICEsignatureBIND_TV_INPUTsignature|privilegedBIND_VOICE_INTERACTIONsignatureREAD_VOICEMAILsignature|privileged|roleWRITE_VOICEMAILsignature|privileged|role
Where this sits
Release 21 of 37 API levels, by date
- Headline features
- 6
- Architecture changes
- 5
- Developer changes
- 5
- Sources cited
- 4
Kernel
This release shipped on Linux kernel versions 3.4. Kernel versions vary by device.