Android Workshop - Session 2
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This document discusses the process of producing an Android application. It describes compiling Java code into byte code and then converting it to Dalvik executable format for use on Android devices. It also covers incorporating resources like layouts, images, strings and menus into the AndroidManifest.xml file and assets folder to create an .apk file. The document outlines different resource types and how to optimize resources for various screen sizes, densities, and orientations using qualifiers. Finally, it recommends several online resources for learning more about Android development.
Android Workshop - Session 2
- 1. Session #2 05-02-2012 http://www.iwillstudy.com/group/android
- 2. Producing an Android App javac Java code Byte code dx Dalvik .java .class exe classes.dex aapt Byte code <xml> Other .class files AndroidManifest.xml .apk <str > Resources
- 5. Resources
- 6. Resource Types(/res/) Animation Resources (/anim or /drawable) Color State List Resource (/color) Drawable Resources(/drawable) Layout Resource(/layout) Menu Resource(/menu) String Resources(/values) Style Resource(/values) More Resource Types(/values)
- 7. Screen Characteristic Screen Qualifier Description characteristic small Resources for small size screens. normal Resources for normal size screens. (This is the baseline size.) Size large Resources for large size screens. xlarge Resources for extra large size screens. land Resources for screens in the landscape orientation (wide aspect ratio). Orientation port Resources for screens in the portrait orientation (tall aspect ratio). Resources for screens that have a significantly taller or wider aspect ratio long (when in portrait or landscape orientation, respectively) than the baseline Aspect screen configuration. ratio notlong Resources for use screens that have an aspect ratio that is similar to the baseline screen configuration.
- 8. Screen Characteristic ldpi Resources for low-density (ldpi) screens (~120dpi). Resources for medium-density (mdpi) screens mdpi (~160dpi). (This is the baseline density.) hdpi Resources for high-density (hdpi) screens (~240dpi). Resources for extra high-density (xhdpi) screens xhdpi (~320dpi). Density Resources for all densities. These are density- independent resources. The system does not scale nodpi resources tagged with this qualifier, regardless of the current screen's density. Resources for screens somewhere between mdpi and tvdpi hdpi; approximately 213dpi. This is not considered a "primary" density group.
- 9. Fragmentation res/layout/my_layout.xml // layout for normal screen size ("default") res/layout-small/my_layout.xml // layout for small screen size res/layout-large/my_layout.xml // layout for large screen size res/layout-xlarge/my_layout.xml // layout for extra large screen size res/layout-xlarge-land/my_layout.xml // layout for extra large in land. orientation res/drawable-mdpi/my_icon.png // bitmap for medium density res/drawable-hdpi/my_icon.png // bitmap for high density res/drawable-xhdpi/my_icon.png // bitmap for extra high density
- 10. Standard Asset Sizes (in Pixels), for Generalized Screen Icon Type Densities Low density screen Medium density High density screen (ldpi) screen (mdpi) (hdpi) Launcher 36 x 36 px 48 x 48 px 72 x 72 px Menu 36 x 36 px 48 x 48 px 72 x 72 px Status Bar 12w x 19h px 16w x 25h px 24w x 38h px (Android 2.3 and (preferred, width (preferred, width (preferred, width later) may vary) may vary) may vary) Status Bar (Android 2.2 and 19 x 19 px 25 x 25 px 38 x 38 px below) Tab 24 x 24 px 32 x 32 px 48 x 48 px Dialog 24 x 24 px 32 x 32 px 48 x 48 px List View 24 x 24 px 32 x 32 px 48 x 48 px
- 11. Asset Type Prefix Example Icons ic_ ic_star.png ic_launcher_calendar Launcher icons ic_launcher .png Menu icons ic_menu ic_menu_archive.png ic_stat_notify_msg.p Status bar icons ic_stat_notify ng Tab icons ic_tab ic_tab_recent.png Dialog icons ic_dialog ic_dialog_info.png
- 12. Options Menu
- 13. Context Menu
- 14. Create a new .xml file in your drawable folder (or drawable-mdpi folder) called gradient.xml, with the following code: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient android:angle="0" android:startColor="#000000" android:endColor="#000000" android:centerColor="#97CF4D" /> </shape>
- 15. Possibilities Augmented Campus Reality Web scraping • camera + maps + compass • news filters = heads up info • sport scores • news eliminators Games • multi-player (bluetooth, Distributed wifi, cell) computing? • location-based (scavenger • 10,000 phones all hunt) donating their idle time Custom overlays for maps • weather, traffic, friends Shared whiteboard
- 16. Android Controls Rss Reader Contacts Manager Weather Application Multimedia Player Near Me Picturesque Stock Market Application Plan My Month Learn English Quick App Rate Music App
- 17. Rss Reader Screen1 Item List (ListView) Button
- 18. Rss Reader Screen2 Options Menu
- 19. Contact Manager Screen1 Buttons (ImageView) Groups List (Expandable Lists - Custom Adapter) Options Menu
- 20. Contact Manager Screen2 PopUp (AlertDialog) Input Area (EditText)
- 21. Contact Manager Screen3 Input (Search EditText) Search Action Search Box(Search Dialog) Button
- 22. Weather app 1 Loading page Image (ImageView) (Splash Screen) Text (TextView)
- 23. Weather app 2 Background Video Playing Text (TextView)
- 24. Multimedia App 1 Drop Down (Spinner) Popup (Dialog Theme) Selection Item(RadioButto n) Button (Button)
- 25. Near Me 1 Tabs (TabHost) Action Item (Button) Separator Status List (ListView) Text (TextView) Image (ImageView)
- 26. Near Me 2 Map(M Map apActiv Compass ity) Pop Up (Toast) Icon (MapOverlayIcon)
- 27. Picturesque 1 Item List (ListView) Action Item (Button) Action Item (ImageButton)
- 28. Picturesque 2 WebView Action Item (Button) Action Item (ImageButton)
- 29. Stock Market Application 1 Loading Page (Splash Screen) Loading (ProgessBar)
- 30. Stock Market Application 2 Loading (ProgressDialog)
- 31. Stock Market Application 3 Horizontal ScrollView Image (ImageView) Action Item (Button) Scripts List (ListView with Separators) Separator Text (TextView)
- 32. Plan My Month (To Do List) 1 Tabs (TabHost) Tasks List(Expandable Lists - Custom Adapter)
- 33. Plan My Month (To Do List) 2 Tabs (TabHost) Image (ImageView) Text (TextView) Tasks List (Expandable List - Custom Adapter)
- 34. Learn English Quick App 1 Image (Dialog Icon) Text(Dialog Title) Text (TextView) Pop Up(AlertDialog)
- 35. Learn English Quick App 2 Download Status (ProgressBar) Action Item (Button) Text (TextView) Text (Linkify Text)
- 36. Online Android Resources ➲ Android developer website http://developer.android.com ➲ Open Handset Alliance http://www.openhandsetalliance.com ➲ Android Market http://market.android.com/publish ➲ Android libraries and extensions http://openintents.org ➲ Android developer forum http://www.anddev.org
- 37. Summary ➲ Solid, proven, popular, open platform ➲ Used on wide range of devices ➲ Support from Google, OEMs, telcoms ➲ Low barriers to entry ➲ Major opportunity for new developers ➲ Creativity, hard work, persistence
- 38. Thanks for coming Android Study Group: http://www.iwillstudy.com/group/android Write to us: info@iwillstudy.com Like us on Facebook: http://www.facebook.com/iwillstudy