<s>
Android	B-Application
Lollipop	I-Application
(	O
codenamed	O
Android	B-Application
L	I-Application
during	O
development	O
)	O
is	O
the	O
fifth	O
major	O
version	O
of	O
the	O
Android	B-Application
mobile	I-Application
operating	O
system	O
developed	O
by	O
Google	B-Application
and	O
the	O
12th	O
version	O
of	O
Android	B-Application
,	O
spanning	O
versions	O
between	O
5.0	O
and	O
5.1.1	O
.	O
</s>
<s>
Unveiled	O
on	O
June	O
25	O
,	O
2014	O
at	O
the	B-Application
Google	I-Application
I/O	O
2014	O
conference	O
,	O
it	O
became	O
available	O
through	O
official	O
over-the-air	O
(	O
OTA	O
)	O
updates	O
on	O
November	O
12	O
,	O
2014	O
,	O
for	O
select	O
devices	O
that	O
run	O
distributions	O
of	O
Android	B-Application
serviced	O
by	O
Google	B-Application
(	O
such	O
as	O
Nexus	B-Device
and	O
Google	B-Application
Play	I-Application
edition	I-Application
devices	I-Application
)	O
.	O
</s>
<s>
The	O
first	O
phone	O
with	O
Android	B-Application
Lollipop	I-Application
was	O
Nexus	B-Device
6	I-Device
.	O
</s>
<s>
One	O
of	O
the	O
most	O
prominent	O
changes	O
in	O
the	O
Lollipop	B-Application
release	O
is	O
a	O
redesigned	O
user	O
interface	O
built	O
around	O
a	O
design	O
language	O
known	O
as	O
Material	B-Application
Design	I-Application
,	O
which	O
was	O
made	O
to	O
retain	O
a	O
paper-like	O
feel	O
to	O
the	O
interface	O
.	O
</s>
<s>
Google	B-Application
also	O
made	O
internal	O
changes	O
to	O
the	O
platform	O
,	O
with	O
the	O
Android	B-Application
Runtime	I-Application
(	O
ART	O
)	O
officially	O
replacing	O
Dalvik	B-Application
for	O
improved	O
application	O
performance	O
,	O
and	O
with	O
changes	O
intended	O
to	O
improve	O
and	O
optimize	O
battery	O
usage	O
.	O
</s>
<s>
,	O
0.41	O
%	O
of	O
Android	B-Application
devices	O
run	O
Lollipop	B-Application
5.0	O
(	O
API	B-General_Concept
21	O
)	O
and	O
2.79	O
%	O
run	O
Lollipop	B-Application
5.1	O
(	O
API	B-General_Concept
22	O
)	O
combined	O
.	O
</s>
<s>
However	O
,	O
this	O
figure	O
is	O
misleading	O
,	O
as	O
on	O
tablets	O
Android	B-Application
5.1	I-Application
is	O
much	O
more	O
popular	O
than	O
it	O
is	O
on	O
phones	O
,	O
being	O
ranked	O
3rd	O
of	O
all	O
Android	B-Application
versions	I-Application
at	O
8.98	O
%	O
when	O
counting	O
Android	B-Application
7.0	I-Application
and	O
7.1	O
Nougat	B-Application
separately	O
.	O
</s>
<s>
When	O
market	O
shares	O
for	O
versions	O
7.0	O
and	O
7.1	O
are	O
combined	O
,	O
Nougat	B-Application
is	O
more	O
popular	O
than	O
Lollipop	B-Application
,	O
at	O
11.04	O
%	O
on	O
tablets	O
,	O
making	O
Lollipop	B-Application
the	O
fourth	O
most	O
popular	O
version	O
.	O
</s>
<s>
Android	B-Application
5.0	I-Application
was	O
first	O
unveiled	O
under	O
the	O
codename	O
"	O
Android	B-Application
L	I-Application
"	O
on	O
June	O
25	O
,	O
2014	O
during	O
a	O
keynote	O
presentation	O
at	O
the	B-Application
Google	I-Application
I/O	O
developers	O
 '	O
conference	O
.	O
</s>
<s>
Alongside	O
Lollipop	B-Application
,	O
the	O
presentation	O
focused	O
on	O
a	O
number	O
of	O
new	O
Android-oriented	O
platforms	O
and	O
technologies	O
,	O
including	O
Android	B-Application
TV	I-Application
,	O
in-car	O
platform	O
Android	B-Application
Auto	I-Application
,	O
wearable	B-Operating_System
computing	I-Operating_System
platform	O
Android	B-Application
Wear	I-Application
,	O
and	O
health	O
tracking	O
platform	O
Google	B-Device
Fit	I-Device
.	O
</s>
<s>
Part	O
of	O
the	O
presentation	O
was	O
dedicated	O
to	O
a	O
new	O
cross-platform	O
design	O
language	O
referred	O
to	O
as	O
"	O
material	B-Application
design	I-Application
"	O
.	O
</s>
<s>
Expanding	O
upon	O
the	O
"	O
card	O
"	O
motifs	O
first	O
seen	O
in	O
Google	B-Application
Now	I-Application
,	O
it	O
is	O
a	O
design	O
with	O
increased	O
use	O
of	O
grid-based	O
layouts	O
,	O
responsive	O
animations	O
and	O
transitions	O
,	O
padding	O
,	O
and	O
depth	O
effects	O
such	O
as	O
lighting	O
and	O
shadows	O
.	O
</s>
<s>
The	O
material	B-Application
design	I-Application
language	O
would	O
not	O
only	O
be	O
used	O
on	O
Android	B-Application
,	O
but	O
across	O
Google	B-Application
's	I-Application
suite	O
of	O
web	O
software	O
as	O
well	O
,	O
providing	O
a	O
consistent	O
experience	O
across	O
all	O
platforms	O
.	O
</s>
<s>
Android	B-Application
5.0	I-Application
introduces	O
a	O
refreshed	O
notification	O
system	O
.	O
</s>
<s>
Individual	O
notifications	O
are	O
now	O
displayed	O
on	O
cards	O
to	O
adhere	O
to	O
the	O
material	B-Application
design	I-Application
language	O
,	O
and	O
batches	O
of	O
notifications	O
can	O
be	O
grouped	O
by	O
the	O
app	O
that	O
produced	O
them	O
.	O
</s>
<s>
Upon	O
the	O
release	O
of	O
this	O
version	O
,	O
for	O
most	O
Android	B-Application
devices	O
,	O
the	O
navigation	O
buttons	O
were	O
completely	O
changed	O
from	O
a	O
left	O
arrow	O
,	O
a	O
house	O
,	O
and	O
two	O
squares	O
,	O
to	O
a	O
left	O
triangle	O
,	O
a	O
circle	O
and	O
a	O
square	O
.	O
</s>
<s>
Lollipop	B-Application
also	O
contains	O
major	O
new	O
platform	O
features	O
for	O
developers	O
,	O
with	O
over	O
5,000	O
new	O
APIs	B-General_Concept
added	O
for	O
use	O
by	O
applications	O
.	O
</s>
<s>
For	O
example	O
,	O
there	O
is	O
the	O
possibility	O
to	O
save	O
photos	O
in	O
a	O
raw	B-Application
image	I-Application
format	I-Application
.	O
</s>
<s>
Additionally	O
,	O
the	O
Dalvik	B-Application
virtual	I-Application
machine	I-Application
was	O
officially	O
replaced	O
by	O
Android	B-Application
Runtime	I-Application
(	O
ART	O
)	O
,	O
which	O
is	O
a	O
new	O
runtime	B-Device
environment	I-Device
that	O
was	O
introduced	O
as	O
a	O
technology	O
preview	O
in	O
KitKat	B-Application
.	O
</s>
<s>
ART	O
is	O
a	O
cross-platform	O
runtime	O
which	O
supports	O
the	O
x86	B-Operating_System
,	O
ARM	B-Architecture
,	O
and	O
MIPS	B-Device
architectures	I-Device
in	O
both	O
32-bit	O
and	O
64-bit	B-Device
environments	O
.	O
</s>
<s>
Unlike	O
Dalvik	B-Application
,	O
which	O
uses	O
just-in-time	O
compilation	O
(	O
JIT	O
)	O
,	O
ART	O
compiles	O
apps	O
upon	B-Application
installation	I-Application
,	O
which	O
are	O
then	O
run	O
exclusively	O
from	O
the	O
compiled	O
version	O
from	O
then	O
on	O
.	O
</s>
<s>
Lollipop	B-Application
also	O
aimed	O
to	O
improve	O
battery	O
consumption	O
through	O
a	O
series	O
of	O
optimizations	O
known	O
as	O
"	O
Project	O
Volta	O
"	O
.	O
</s>
<s>
Among	O
its	O
changes	O
are	O
a	O
new	O
battery	O
saver	O
mode	O
,	O
job-scheduling	O
APIs	B-General_Concept
which	O
can	O
restrict	O
certain	O
tasks	O
to	O
only	O
occur	O
over	O
Wi-Fi	O
,	O
and	O
batching	O
of	O
tasks	O
to	O
reduce	O
the	O
overall	O
amount	O
of	O
time	O
that	O
internal	O
radios	O
are	O
active	O
on	O
.	O
</s>
<s>
The	O
Android	B-Application
Extension	O
Pack	O
APIs	B-General_Concept
also	O
provide	O
graphics	O
functions	O
such	O
as	O
new	O
shaders	O
,	O
aiming	O
to	O
provide	O
PC-level	O
graphics	O
for	O
3D	O
games	O
on	O
Android	B-Application
devices	O
.	O
</s>
<s>
A	O
number	O
of	O
system-level	O
,	O
enterprise-oriented	O
features	O
were	O
also	O
introduced	O
under	O
the	O
banner	O
"	O
Android	B-Application
for	O
Work	O
"	O
.	O
</s>
<s>
The	O
Samsung	B-Application
Knox	I-Application
security	O
framework	O
was	O
initially	O
planned	O
to	O
be	O
used	O
as	O
a	O
foundation	O
for	O
"	O
Android	B-Application
for	O
Work	O
"	O
,	O
but	O
instead	O
Google	B-Application
opted	O
to	O
use	O
its	O
own	O
technology	O
for	O
segregating	O
personal	O
and	O
work-oriented	O
data	O
on	O
a	O
device	O
,	O
along	O
with	O
the	O
accompanying	O
APIs	B-General_Concept
for	O
managing	O
the	O
environment	O
.	O
</s>
<s>
With	O
the	O
"	O
Smart	O
Lock	O
"	O
feature	O
,	O
devices	O
can	O
also	O
be	O
configured	O
so	O
users	O
do	O
not	O
have	O
to	O
perform	O
device	O
unlocking	O
with	O
a	O
PIN	O
or	O
pattern	O
when	O
being	O
on	O
a	O
trusted	O
location	O
,	O
or	O
in	O
proximity	O
of	O
a	O
designated	O
Bluetooth	B-Protocol
device	O
or	O
NFC	O
tag	O
.	O
</s>
<s>
Lollipop	B-Application
was	O
,	O
additionally	O
,	O
to	O
have	O
device	O
encryption	O
enabled	O
by	O
default	O
on	O
all	O
capable	O
devices	O
;	O
however	O
,	O
due	O
to	O
performance	O
issues	O
,	O
this	O
change	O
was	O
held	O
over	O
to	O
its	O
successor	O
,	O
Android	B-Application
Marshmallow	I-Application
.	O
</s>
<s>
A	O
developer	O
preview	O
of	O
Android	B-Application
L	I-Application
,	O
build	O
LPV79	O
,	O
was	O
released	O
for	O
the	O
Nexus	B-Device
5	I-Device
and	O
2013	B-Device
Nexus	I-Device
7	I-Device
on	O
June	O
26	O
,	O
2014	O
in	O
the	O
form	O
of	O
flashable	O
images	O
.	O
</s>
<s>
Source	O
code	O
for	O
GPL-licensed	O
components	O
of	O
the	O
developer	O
preview	O
was	O
released	O
via	O
Android	B-Application
Open	O
Source	O
Project	O
(	O
AOSP	O
)	O
in	O
July	O
2014	O
.	O
</s>
<s>
A	O
second	O
developer	O
preview	O
build	O
,	O
LPV81C	O
,	O
was	O
released	O
on	O
August	O
7	O
,	O
2014	O
,	O
alongside	O
the	O
beta	O
version	O
of	O
the	B-Application
Google	I-Application
Fit	O
platform	O
and	O
SDK	O
.	O
</s>
<s>
As	O
with	O
the	O
previous	O
build	O
,	O
the	O
second	O
developer	O
preview	O
build	O
is	O
available	O
only	O
for	O
the	O
Nexus	B-Device
5	I-Device
and	O
2013	B-Device
Nexus	I-Device
7	I-Device
.	O
</s>
<s>
On	O
October	O
15	O
,	O
2014	O
,	O
Google	B-Application
officially	O
announced	O
that	O
Android	B-Application
L	I-Application
would	O
be	O
known	O
as	O
Android	B-Application
5.0	I-Application
"	I-Application
Lollipop	I-Application
"	I-Application
.	O
</s>
<s>
The	O
company	O
also	O
unveiled	O
launch	O
devices	O
for	O
Android5.0including	O
Motorola	O
's	O
Nexus	B-Device
6	I-Device
and	O
HTC	B-Application
's	O
Nexus	B-Device
9for	O
release	O
on	O
November	O
3	O
,	O
2014	O
.	O
</s>
<s>
Google	B-Application
stated	O
that	O
Nexus	B-Device
(	O
including	O
the	O
Nexus	B-Device
4	I-Device
,	O
5	O
,	O
7	O
,	O
and	O
10	B-Device
)	O
and	O
Google	B-Application
Play	I-Application
edition	I-Application
devices	I-Application
would	O
receive	O
updates	O
to	O
Lollipop	B-Application
"	O
in	O
the	O
coming	O
weeks	O
"	O
;	O
one	O
more	O
developer	O
preview	O
build	O
for	O
Nexus	B-Device
devices	O
and	O
the	O
new	O
SDK	O
revision	O
for	O
application	O
developers	O
would	O
be	O
released	O
on	O
October	O
17	O
,	O
2014	O
.	O
</s>
<s>
Update	O
schedules	O
for	O
third-party	O
Android	B-Application
devices	O
may	O
vary	O
by	O
manufacturer	O
.	O
</s>
<s>
On	O
December	O
2	O
,	O
2014	O
,	O
factory	O
images	O
for	O
Nexus	B-Device
smartphones	O
and	O
tablets	O
were	O
updated	O
to	O
the	O
5.0.1	O
version	O
,	O
which	O
introduces	O
a	O
few	O
bug	O
fixes	O
,	O
and	O
a	O
serious	O
bug	O
that	O
affected	O
Nexus4	B-Device
devices	O
and	O
prevented	O
the	O
audio	O
from	O
working	O
during	O
phone	O
calls	O
.	O
</s>
<s>
A	O
device-specific	O
Lollipop	B-Application
5.0.2	O
(	O
LRX22G	O
)	O
version	O
was	O
released	O
for	O
the	O
first-generation	O
Nexus	B-Device
7	I-Device
on	O
December	O
19	O
,	O
2014	O
.	O
</s>
<s>
Android5.1	O
,	O
an	O
updated	O
version	O
of	O
Lollipop	B-Application
,	O
was	O
unveiled	O
in	O
February	O
2015	O
as	O
part	O
of	O
the	O
Indonesian	O
launch	O
of	O
Android	B-Application
One	I-Application
,	O
and	O
is	O
preloaded	O
on	O
Android	B-Application
One	I-Application
devices	O
sold	O
in	O
Indonesia	O
and	O
the	O
Philippines	O
.	O
</s>
<s>
Google	B-Application
officially	O
announced	O
5.1	O
by	O
releasing	O
updates	O
for	O
existing	O
devices	O
on	O
March	O
9	O
,	O
2015	O
.	O
</s>
<s>
In	O
2015	O
,	O
Amazon.com	B-Application
forked	O
Lollipop	B-Application
to	O
produce	O
Fire	B-Application
OS	I-Application
5	I-Application
"	I-Application
Bellini	I-Application
"	I-Application
for	O
Amazon	O
's	O
Fire	O
HD-series	O
devices	O
.	O
</s>
