Minicurso Android

GOOGLE ANdroid

Mario Jorge Pereira

14

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20

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20

10

20

09

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08

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07

20

06

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05

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04

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03

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02

20

Agenda
Setup (Ambiente e AVD’s)

Development

Alo Mundo (Hello World)

Lista Tarefas (ToDo List)

(Listar, Inserir, Excluir, Preferencias …)

http://developer.android.com

Por onde começar?

ADT Bundle:
• Eclipse + ADT plugin
• Android SDK Tools
• Android Platform-tools

Pré requisito: JDK instalada

Android Virtual Device Manager

Android Virtual Device AVD

Emulador

Alô Mundo

File > New > Android Application Project

src/

 
(código fonte: .java)"

gen/ 
(código gerado: R.java )"

bin/ 
(bytecodes: .dex)"

libs/

 
(bibliotecas)"

Es
tr

ut
ur
a

res/

 
(recursos: layouts, strigs,
icones …)"

assets/

 
(outros recursos: arquivos em
geral)

"
rsion="1.0
<?xml ve
esources>
<r

"utf-8"?>
encoding=

/string>
Alo Mundo<

>
s</string>
"app_name"
s "> S e t t i n g
ring name=
g
<st
ion_settin
ct
</string>
a
llo world!
ing name="
e
<str
o _ w o r l d "> H
name="hell
<string

!

!

/resources
<

>

strings.xml

/* AUT

ED FILE.
O-GENERAT

D I F Y .* /
DO NOT MO

class R {
al
{
public fin
class attr
al
static fin
public

0;
=0x7f04000
imen {

}
s d
rgin
final clas
izontal_ma
tic
01;
_hor
public sta
n= 0 x 7 f 0 4 0 0
t activity
argi
l in
vertical_m
tatic fina
ty_
public s
int activi
inal
c static f
publi

;
}
s layout {
0x7f030000
al clas
fin
a i n=
activity_m
lic static
pub
int
tic final
public sta

}

}
...

R.java

MainActivity.java

!
!

}

public cla
ss MainAct
ivity exte
!
nds Activi
ty {
@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
InstanceSt
{
setContent
ate);
View(R.lay
o u t .a c t i v i
}
t y _ m a i n) ;
@Override
public boo
lean onCre
ateOptions
getMenuInf
Menu(Menu
later().in
menu) {
flate(R.me
return tru
n u .m a i n , m
e;
enu);
}

AndroidManifest.xml
utfencoding=“
sion="1.0"

8"?>

<?xml ver
. . .>
<manifest
...
. >
ication ..
i t y "
<appl
.MainActiv
mundo
xample.alo
<activity
com.e
: n a m e=" b r .
" >
android
g/app_name
strin
d : l a b e l= " @
" />
androi
ction.MAIN
t e r>
/>
tent.a
intent-fil
LAUNCHER"
android.in
<
m e= "
gory.
android:na
ntent.cate
roid.i
<action
: n a m e= " a n d
droid
ategory an
<c
l t e r>
/intent-fi
<
>
</activity
i o n>
</applicat
>
</manifest

ToDo
br.mobileday.todo

File > New > Android Application Project

Log.[n

NSAGEM”);
e l ] (“ T A G ”, “ M E
iv

!

(Verbose)
Log.v
(Debug)
Log.d
(Info)
Log.i
(Warning)
Log.w
e (Erro)
Log.
(
.wtf ...)
Log

Log

yout ... >
elativeLa

<R
...

<Button
d / b o t a o "
i d : i d= " @ + i
andro
_ c o n t e n t "
i d t h= " w r a p

d:layout_w
androi
p_content"
e i g h t= " w r a
d:layout_h
t V i e w 1 "
roi
x
and
w= " @ + i d / t e
ayout_belo
oid:l
l= " t r u e "
andr
rHorizonta
yout_cente
android:la
"Botao"
r o i d : t e x t=
and
etodo" />
o n C l i c k= " m
android:

...
L a y o u t>
</Relative

activity_main.xml

MainActivity.java
public cla
ss MainAct
ivi

!

ty extends
Activity {

@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
InstanceSt
{
setContent
ate);
View(R.lay
o u t .a c t i v i
}
t y _ m a i n) ;
...
public voi
d metodo(V
iew v){
Log.i(“T

AG”,"TEXTO
");
}
}

TOAST
.show
a s t .L E N G T H _ L O N G)
, To
x t (t h i s , " T E X T O "
t.makeTe

Toas
!
!
G
Toast.LENGTH_LON
!
st.LENGTH_SHORT
Toa
!

();

MainActivity.java
public cla
ss MainAct
ivity exte
!
nds Activi
ty {
@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
InstanceSt
{
setContent
ate);
View(R.lay
o u t .a c t i v i
}
t y _ m a i n) ;
...
public voi
d metodo(V
iew v){
Toast.ma
keText(thi
s, "ToDo!"
}
, Toast.LE
N G T H _ L O N G)
}
.show();

findbyid
y I d ( R . i d .[ i d ] ) ;
B
[Tipo]) findView
[Tipo] var = (
!

v a r . m e t o d o ( ) ;
!

MainActivity.java
public cla
ss MainAct
ivity exte
!
nds Activi
ty {
@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
InstanceSt
{
setContent
ate);
View(R.lay
o u t .a c t i v i
}
t y _ m a i n) ;
...
public voi
d metodo(V
iew v){
TextVie

w tv = (Te
xtView) fi
tv.setTex
ndViewById
t( "ToDO!")
(R.id.text
;
}
View1);
}

NovaActivity.java
public cla
ss NovaAct
ivity

!

extends Ac
tivity {

@Overrid
e
protecte
d void onC
reate(Bund
super.
le savedIn
onCreate(s
stanceStat
avedInstan
e) {
setCon
ceState);
tentView(R
.layout.ac
}
tivity_nov
a) ;

!

@Overrid
e
public b
oolean onC
reateOptio
getMen
nsMenu(Men
uInflater(
u menu) {
).inflate(
return
R.menu.nov
true;
a, menu);
}
!

}

AndroidManifest.xml
“utf-8"?>
encoding=

sion="1.0"
<?xml ver
f e s t . . .>
<mani
...

tion ... >
<applica
...
A c t i v i t y "
va
tivity
ay.todo.No
ed
<ac

="br.mobil
me
ty_nova" >
vi
android:na
title_acti
/
l= " @ s t r i n g
be
android:la
>
</activity
>
pplication
</a

/manifest>
<

MainActivity.java
public cla
ss MainAct
ivity exte
!
nds Activi
ty {
@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
InstanceSt
{
setContent
ate);
View(R.lay
o u t .a c t i v i
}
t y _ m a i n) ;
...
public voi
d metodo(V
iew v){
ntent in
I
tent = new
Intent(thi
ntent.pu
i
s,NovaActi
tExtra("ch
v i t y .c l a s s
ave", "val
);
tartActi
s
or");
vity(inten
t);
}
}

yout ... >
elativeLa

<R
...

<Button
d / b o t a o "
i d : i d= " @ + i
andro
_ c o n t e n t "
i d t h= " w r a p

d:layout_w
androi
p_content"
e i g h t= " w r a
d:layout_h
t V i e w 1 "
roi
x
and
w= " @ + i d / t e
ayout_belo
oid:l
l= " t r u e "
andr
rHorizonta
yout_cente
android:la
"Voltar"
r o i d : t e x t=
and
oltar" />
o n C l i c k= " v
android:

...
L a y o u t>
</Relative

activity_nova.xml.java

NovaActivity.java
public cla
ss NovaAct
ivity exte
!
nds Activi
ty {
@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
set
InstanceSt
{
ContentVie
ate);
w(R.layout
Bun
. activity_
dle extas
n o v a) ;
= getInten
Tex
t().getExt
tView tv =
ras();
(TextView)
tv.
findViewBy
setText(ex
Id(R.id.te
tas.getStr
xtView1);
}
ing("chave
"));
...

public voi
d voltar(V
iew v){
fin
ish();
}
}

>
t 1 "
ayout ...
lativeL
id/editTex
<Re
"@+
n d r o i d : i d=
t "
a
fill_paren
<EditText
t h= "
t "
layout_wid
android:
rap_conten
t= " w
yout_heigh
e"
android:la
t L e f t= " t r u
ren
ut_alignPa
"
o
i g h t= " t r u e
ndroid:lay
a
entR
t_alignPar
you
"
android:la
t T o p= " t r u e
aren
out_alignP
y
android:la
f a "
"Nome Tare
n t=
android:hi
xt"
u t T y p e= " t e
p
android:in
>
d : e m s= " 1 0 "
androi
/>
uestFocus
<req
>
"
</EditText
id/button1
="@+
t "
android:id
rap_conten
Button
<
h= " w
ayout_widt
t "
android:l
rap_conten
="w
out_height
"
y
/editText1
android:la
@+id

u t _ b e l o w= "
t a l= " t r u e "
droid:layo
an
izon
_centerHor
yout
android:la
r"
i c k= " s a l v a
Cl
android:on

Salvar" />
x t="
android:te
>
tiveLayout
</Rela

activity_nova.xml

public cla
ss NovaAct
ivity

!

!

private Ed
itText tex
t;

NovaActivity.java
extends Ac
tivity {

@Overri
de
protect
ed void on
Create(Bun
supe
dle savedI
r.onCreate
nstanceSta
(savedInst
te) {
setC
anceState)
ontentView
;
(R.layout.
text
activity_n
= (EditTex
o v a) ;
t) findVie
}
wById(R.id
.e d i t T e x t 1
);
!

@Overri
de
public
boolean on
CreateOpti
getM
onsMenu(Me
enuInflate
nu menu) {
r().inflat

retu
e(R.menu.n
rn true;
ova, menu)
;
}

!

}

public voi
d salvar(V
iew v){
Intent d
ados = new
Intent();
dados.putE
xtra("nome
", text.ge
setResul
tText().to
t( RESULT_O
String());
K, d a d o s ) ;
finish()

;
}

MainActivity.java
public cla
ss MainAct
ivity exte

nds Activi
ty {
...

!

!

}

public voi
d metodo(V
iew v){
Intent i
ntent = ne
w Intent(t
startAct
his,NovaAc
ivityForRe
t i v i t y .c l a
sult(inten
ss);
}
t,9999);
@Override
protected
void onAct
ivityResul
if(reque
t (i n t r e q u
stCode ==
estCode, i
9999 && re
nt resultC
oast.make
T
sultCode =
ode, Inten
Text(this,
= RESULT_O
t data) {
data.getSt
K){
}
ringExtra(
"nome"), T
}
oast.LENGT
H _ L O N G) . s h
ow();

ut ... >
ativeLayo

<Rel
...

<ListView
s t V i e w 1 "
i
i d=" @ + i d / l
ndroid:
h _ p a r e n t "
a
c
w i d t h= " m a t
id:layout_
ro
c o n t e n t "
_
and
i g h t= " w r a p

:layout_he
oid
t o m= " t r u e "
andr
nParentBot
ayout_alig
oid:l
t= " t r u e "
f
andr
gnParentLe
layout_ali
id:
t= " t r u e "
andro
ParentRigh
yout_align
id:la
"true" >
=
andro
nParentTop
ayout_alig
android:l
ListView>
</
...
L a y o u t>
</Relative

activity_main.xml

tp://schem
d r o i d= " h t

as

com/apk/re
.android.

s/

n
nu xmlns:a
<me

android" >
!
"
<item
ction_nova
/a
d:id="@+id
androi
o r y= " 1 0 0 "
eg
orderInCat
android:
n= " n e v e r "
io
:showAsAct
>
android
a T a r e f a "/
v
: t i t l e= " N o
android
!
</menu>

main.xml

MainActivity.java

!

public cla
ss MainAct
ivity exte
private
nds Activi
ListView l
ty {
istView;
@Override
protected
void onCre
ate(Bundle
super.onCr
savedInsta
eate(saved
nceState)
InstanceSt
{
setContent
ate);
View(R.lay
o u t .a c t i v i
listView =
t y _ m a i n) ;
(ListView)
findViewBy
String[] v
I d ( R . i d .l i
alues = ne
s t V i e w 1) ;
w String[]
ArrayAdapt
{"Acorda",
er<String>
"MobileDay
adapter =
andro
", " H a p p y H
new ArrayA
o u r "} ;
id.R.layou
dapter<Str
t.simple_l
listView.s
i n g > (t h i s ,
ist_item_1
etAdapter(

,values);
adapter);
}

public boo
lean onOpt
ionsItemSe
switch
lected(Men
(item.getI
uItem item
temId()) {
) {

case R.id.
action_nov

a:
Int
ent intent

= new Inte
sta
nt(this, N
rtActivity

ovaActivit
ForResult(
ret
y .c l a s s ) ;
intent, 99
urn true;
99);
default:

return sup
er.onOptio
}
nsItemSele
cted(item)
}
;
...
}

MainActivity.java

public cla
ss MainAct
ivity exte
private
nds Activi
ListView l
ty {
istView;
private
static Arr
ayList<Str
private
ing> value
ArrayAdapt
s = new Ar
er<String>
!
rayList<St
adapter;
ring>();
@Overri
de
protect
ed void on
Create(Bun
supe
dle savedI
r.onCreate
nstanceSta
(savedInst
te) {
setC
anceState)
ontentView
;
(R.layout.
list
activity_m
View = (Li
a i n) ;
stView) fi
adap
ndViewById
ter = new
( R . i d .l i s t
ArrayAdapt
View1);

er<String>

(t h i s ,
andr
list
oid.R.layo
View.setAd
ut.simple_
a p t e r (a d a p
}
list_item_
ter);
1, v a l u e s )
;
!

}

@Override
protected
void onRes
ume() {
super.o
nResume();

adapter
.notifyDat
aSetChange
}
d();
...

MainActivity.java
public cla
ss MainAct
ivity exte
...
nds Activi
t y {
@Overrid
e
protecte
d void onA
ctivityRes
resultCode
u l t (i n t r e
, Intent d
questCode,
ata) {
if (re
int
questCode
== 9999 &&
Str
resultCode
ing tarefa
== RESULT_
= data.get
val
OK) {
StringExtr
ues.add(ta
a("nome");
refa);

}
}
!

}

MainActivity.java

public cla
ss MainAct
ivity exte
...
nds Activi
t y {
private
SharedPref
erences se
@Overri
ttings;
de
protect
ed void on
Create(Bun
...
dle savedI
nstanceSta
te) {
sett
ings = Pr
eferenceMa
Edit
nager.getD
or editor
efaultShar
= settings
edPreferen
edit
.edit();
ces(this);
or.putStri

ng("ultimo
edit
", "");
or.commit(
);
}
...
@Overri
de
protect
ed void on
ActivityRe
if (
s u l t (i n t r
requestCod
equestCode
e == 9999
, int resu

&& resultC
ltCode, In
String tar
ode == RES
tent data)
efa = data
ULT_OK) {

{
.getString
values.add
Extra("nom
(tarefa);
e");

Editor edi
t o r = sett

ings.edit(
editor.put
);
String("ul

timo", tar
editor.com
efa);
mit();
}
}
}

NovaActivity.java
public cla
ss NovaAct
ivity

!

!

private Ed
itText tex
t;

extends Ac
tivity {

protect
ed void on
Create(Bun
super
dle savedI
.onCreate(
nstanceSta
savedInsta
te) {
setCo
nceState);
ntentView(

R.layout.a
text
ctivity_no
= (EditTex
v a) ;
t) findVie
Share
wById(R.id
dPreferenc
.e d i t T e x t 1
es setting
);

s =
Prefe

renceManag
Strin
er.getDefa
g valor =
ultSharedP
settings.g
references
text.
etString("
(this);
setText(va
ultimo", "
lor);
Tarefa");
}
...
}

mlns:andr
<menu x
ndroid" >
res/a
!

://schem
o i d= " h t t p

d.com/apk/
as.androi

<item
/ e x i b i r "
d : i d= " @ + i d

androi
g o r y= " 1 0 0 "
rderInCate
android:o
="never"
owAsAction
android:sh
Exibir"/>
i d : t i t l e= "
andro
!

</menu>

context_menu.xml

MainActivity.java

public cla
ss MainAct
ivity exte
...
nds Activi
t y {
@Overrid
e
protecte
d void onC
reate(Bund
...
le savedIn

stanceStat
e ) {
reg
isterForCo
ntextMenu(
}
listView);

!
@Overrid
e
public v
oid onCrea
teContextM
ContextMen
enu(Contex
uInfo menu
tMenu menu
Info) {
, View v,
super.
onCreateCo
ntextMenu(
MenuIn
menu, v, m
flater inf
enuInfo);
later = ge
inflat
tMenuInfla
er.inflate
ter();
(R.menu.co
}
ntext_menu
, menu);
...
}

MainActivity.java
public cla
ss MainAct
ivity exte
...
nds Activi
t y {
public b
oolean onC
ontextItem

AdapterCon
Selected(M
textMenuIn
enuItem it
fo info =
item.getMe
em) {
(AdapterCo
nuInfo();
ntextMenuI

switch (it
nfo)
em.getItem
Id()) {

case R.id.
action_set

t i n g s:
String val
or = (Stri
listView.g
ng)
etItemAtPo
sition(inf

o .p o s i t i o n
Toast.make
);
Text(this,

valor, Toa
return tru
s t .L E N G T H _
e;
L O N G) . s h o w

default:
();

return sup
er.onConte

xtItemSele
}
cted(item)
;
}
...
}

xmlns:andr
<menu
ndroid" >
a
!

://schemas
o i d= " h t t p

.a

m/apk/res/
ndroid.co

<item
id/exibir"
@+

droid:id="
an
g o r y= " 1 0 0 "
te
:orderInCa

android
o n= " n e v e r "
i
:showAsAct
android

“Exibir"/>
=
roid:title
and
<item
/ e x c l u i r "
id
oid:id="@+
andr
r y= " 1 0 0 "
go
rderInCate
"
android:o
i o n= " n e v e r
ct
id:showAsA
andro
xcluir"/>
E
i d : t i t l e= "
andro
!
</menu>

context_menu.xml

MainActivity.java
public cla
ss MainAct
ivity exte
...
nds Activi
t y {
public
boolean on
ContextIte

mSelected(
AdapterCon
MenuItem i
textMenuIn
tem) {
item.getMe
fo info =
nuInfo();
(AdapterCo
ntextMenuI

nfo)
switch (it
em.getItem

Id()) {
case R.i
d.exibir:

String
valor = (S

tring) lis
tView.getI
Toast.make
temAtPosit
Text(this,

i o n ( i n f o .p
valor, Toa
return tru
osition);
s t .L E N G T H _
e;

L O N G) . s h o w
case R.id.
();
excluir:

v a l u e s . r e
move(info.

position);
a d a p t e r . n

otifyDataS

etChanged(
return tru
);
e;

default:

return sup
er.onConte

}
xtItemSele
cted(item)
...
;
}

r o i d= " h t t p
xmlns:and

s.android.
://schema

com

android" >
/apk/res/

<menu
!

<item
tion_nova"
/ac
d : i d=" @ + i d

androi
g o r y= " 1 0 0 "
ate
d:orderInC
androi
n= " n e v e r "
tio
d:showAsAc
androi
T a r e f a "/ >
ova
d : t i t l e= " N
androi
<item

@+id/site"
="

android:id
g o r y= " 1 0 0 "
ate
d:orderInC

androi
o n= " n e v e r "
ti
d:showAsAc
androi

e= " S i t e "/ >
tl
android:ti
</menu>

menu.xml

MainActivity.java

public cla
ss MainAct
ivity exte
...
nds Activi
t y {
public
boolean on
OptionsIte
switc
mSelected(
h (item.ge
MenuItem i
tItemId())
tem) {
case
{
R.id.actio
n _ n o v a:
no
va();
re
turn true;

case R.id.
site:
Intent i
ntent =
new Inte
nt(Intent.
"http://ww
ACTION_VIE
w.google.c
W,Uri.pars
o m ") ) ;
e (
startAct
ivity(inte
nt);
return t
rue;
defau
lt:
re
turn super
.onOptions
}
ItemSelect
ed(item);
}
...
}

Esta obra está licenciada sob a licença Creative Commons
Atribuição-CompartilhaIgual 3.0 Não Adaptada. Para ver uma cópia
desta licença, visite http://creativecommons.org/licenses/by-sa/3.0/.

ANDROID
Mario Jorge Pereira
Como me encontrar?
http://www.mariojp.com.br
twitter.com/@mariojp
mariojp@gmail.com

Minicurso Android

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