1. Basic Android #1
Build your simple app
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2. Build Simple App
download android sdk
create your first app
http://developer.android.com/sdk/index.html#mac-bundle
Step 1
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3. Structure of project
src
assets
libs
res *
AndroidManifest.xml
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4. Drawable
xhdpi 2.0
hdpi 1.5
mdpi 1.0
ldpi 0.75
This means that if you generate a 200x200 image for xhdpi devices,
you should generate the same resource in 150x150 for hdpi,
100x100 for mdpi, and 75x75 for ldpi devices.
ref:http://developer.android.com/training/basics/supporting-devices/screens.html
Nexus 7
true tab3g
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5. AndroidManifest.xml
เวลาอัพขึ้น market ต้องมากขึ้นเรื่อยๆ
แสดง icon ของApp
Activity นี้จะแสดงแต่แนวตั้ง
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6. Life Cycle Activity
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7. Thursday, August 8, 13

8. Activity?
จะมีแต่ view เดี่ยวๆโปรแกรมทํางานไม่ได้
if it has a UI, it’ll have at least one
Activity
Relationship between an Activity with a
UI screen ---> MVC paradigm (ref:
Android in action )
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9. A
B
A
Activity
Intent intent = new Intent(this, A.class);
startActivity(intent);
Intent intent = new Intent(this, B.class);
startActivity(intent);
Intent intent = new Intent(this, A.class);
startActivity(intent);
ถ้ากดBack สองที ?
show A1
show B1
show A
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10. setcontentView(R.layout.list_item_icom);
ImageView imgIcon = (ImageView)findViewById(R.id.icon);
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11. Layout
LinearLayout RelativeLayout
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12. • Measure: 0.977ms
• Layout: 0.167ms
• Draw: 2.717ms
The timings for rendering a complete list item using this layout are:
• Measure: 0.598ms
• Layout: 0.110ms
• Draw: 2.146ms
http://developer.android.com/training/improving-layouts/optimizing-layout.html
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13. Most of this time difference is due to the use of
layout_weight in the LinearLayout design,
which can slow down the speed of measurement
http://developer.android.com/training/improving-layouts/optimizing-layout.html
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14. Thank you for your
Attention
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