android workshop (night of chances 2015)
TRANSCRIPT
![Page 1: Android Workshop (Night of Chances 2015)](https://reader031.vdocuments.mx/reader031/viewer/2022020110/55c6a759bb61eb4e548b4571/html5/thumbnails/1.jpg)
Android
Workshop Štefan Mitrík
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Why Android?
1 000 000 000 active users
+
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Workshop overview
• Basic theory
– Very short
– Quite a candy
• App description
– Simple architecture
• Coding
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Activity
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Activity
• Usually single screen
• Custom lifecycle
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3. onStop()
Activity 1. onCreate()
4. onDestroy()
2. onStart()
...
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Activity
• Screen orientation change
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Activity
Activity A
1
2
3
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Activity
Activity A
1
2
3
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Activity
Activity A Activity B
1
2
3
2
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Activity
Activity A Activity B
1
2
3
2 Intent
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Intent
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Intent
Activity A Activity B
1
2
3
2
Intent
Activity B
Item 2
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Intent
start external app
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Intent - start
external app
Activity A
1
2
3
Intent
open
website
eset.com
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Apps lifecycle
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Apps lifecycle
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Apps lifecycle
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Apps lifecycle
Memory (RAM)
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Apps lifecycle
Memory (RAM)
onCreate()
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Apps lifecycle
Memory (RAM)
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Memory (RAM)
onStop()
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Memory (RAM)
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Apps lifecycle
Memory (RAM)
onCreate()
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Apps lifecycle
Memory (RAM)
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Memory (RAM)
onStop()
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Apps lifecycle
Memory (RAM)
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Apps lifecycle
Memory (RAM)
Low memory
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Apps lifecycle
Memory (RAM)
Low memory onDestroy()
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Apps lifecycle
Memory (RAM)
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Apps lifecycle
Memory (RAM)
onCreate()
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How to work in background? For example music player
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Service
• Long running operations
• Custom lifecycle
• No UI
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Activity A
Playlists
Service – Playing music
Service
Activity B
Player controls
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Activity A
Playlists
Service – Playing music
Service
Activity B
Player controls
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Activity A
Playlists
Service – Playing music
Service
Activity B
Player controls
play pause
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Apps lifecycle
Memory (RAM)
Low memory
App with
service
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Apps lifecycle
Memory (RAM)
Low memory onDestroy()
App with
service
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Broadcasts
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Broadcasts
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Broadcasts
Broadcast
receivers
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Broadcasts
Broadcast
receivers
Incomming
message
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Broadcasts
Broadcast
receivers
Incomming
message
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• Activity – usually single screen
• Service – background, long running
• Intent – communication (inner/inter)
• Broadcast – data/events propagation
Theory summary
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Problem to solve
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Measure phone usage
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Inspiration
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Display
Statistics
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Display
Statistics
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Architecture
Single Activity App
UML 5.5 notation
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Architecture
Single Activity App
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Architecture Broadcast receiver
(display on/off)
Single Activity App
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Architecture Broadcast receiver
(display on/off)
screen turned on
Single Activity App
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Architecture Broadcast receiver
(display on/off)
screen turned on
Service
Single Activity App
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Let’s code!
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Step 1
MainActivity.java
WakeUps Application
AndroidManifest.xml
• Declarations
• Permissions
• …
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Step 2
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
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Step 2
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
1 Start Service
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Step 2
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
1 Start Service
2
Listen to OFF
broadcasts
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Step 2
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
1 Start Service
2
Listen to OFF
broadcasts
3
Display “Hello Kitty” message
when screen turns on
4
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Step 3
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
ON/OFF 5
Pass info to
service
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Step 4
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
ON/OFF
6 Calculate
last wake up
duration
Persistence Helper
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Step 5
MainActivity
WakeUps Application
Service DisplayStatsService
ScreenBroadcastReceiver
ON/OFF
Display total
wake ups
number Persistence Helper
7
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Thank you!