lecture 2 agenda setting-up projects properly review git config java event model anatomy of and...

Lecture 2 agendaSetting-up projects properlyReview git configJava event modelAnatomy of and Android Application Activity LifecycleState Changes; saving and restoring stateModel-View-Controller in AndroidViews, View Groups, LayoutsA/S Designer Toollayouts and resources

git config --global user.name "Your Name"git config --global user.email "your_email@whatever.com"

csgerber/proCapitalquiz3gcsgerber/labLifeCycle3g

What's inside an APK

Git ReviewBasic Git Commands

add/reset/commit:

move files from working-dir to stage-dir(aka index)git add .git add res/.git add src/.git add res/values/strings.xml

move files from stage-dir(aka index) to working-dirgit reset HEAD .git reset head res/.git reset head src/.git reset head res/values/strings.xml

git commit -m “your commit message.”

Reverting (does the exact opposite)

git revert 0da8 --no-editgit revert head --no-editgit revert head~3 --no-edit

To clear all local changes since last pushgit reset --hard origin/master

To delete a remote branchgit push origin :branchName

Amending:

Every commit is associated with a sha-1 hash. That hash is derived from 1/ the file changes in that commit and 2/ the previous commit.

You can not change any commit unless that commit is at the head. Since no other commits depend on the head, you may safely change the head.

To change the head, usegit commit --amend -m “your message”git commit --amend --no-edit

Branching: To list the branches in a project:git branchgit branch -r git branch --all To create a branch: git checkout -b branchName c39bgit checkout -b branchName

To delete a branch:git branch -D branchName

To checkout a branch:git checkout 7afegit checkout master

Pushing to remotes:

To see the remotes:git remote -v show To push to a remote:git push origin mastergit push --all

To clear all local changes since last pushgit reset --hard origin/master

Android Studio

Default keymap:http://android.cs.uchicago.edu/content/slides/keymap.pdf

File || settings || keymap

The Event Model

Event(onClick)

No Event-Listener listening

No Catcher

Event-Source(Button)

No Event Listener

Event(onClick)

Event-Listener listening

Catcher ready to catch

Event-Source(Button)

OnClick-Listener

Any Object

Wrong Event

Event source not registered

Event(onClick)

Event-Listener listening

Catcher ready to catch

OnClick-ListenerEvent-Source

(Button)

Any Object

OnMouse-Listener

Event(onMouse)

Resources in Android

Layouts and resources

Code: Java (or C if you use NDK)Metafiles: AndroidManifest, project.properties, .gitignore. These all describe the project. Resources “anything in android that is not code or metafiles”

Activities have one or more layouts, and all Layouts have a root-ViewGroup. This root-ViewGroup is the container for the Views.

R.java (gen directory) is a bridge between your resources and your code. If you want to interact programmatically with a resource, it must have an id.

Inspecting layouts and resources

You can view both xml and design mode in AS.

You can see how it would look on multiple devices || preview all screens, and toggle with remove previews.

Layouts and resources

res directories can have suffixes, such as layout-land, or drawable-hdpi, values-es, etc.

These suffixes allow you to differentiate at RUNTIME depending on the settings, hardware, and configuration of the device.

For example, if your device is in landscape mode, it'll try to fetch the layout from layout-land first, then it will try to fetch the layout from layout. Vice versa as well; if it's in portait mode, it'll try for layout-port, then layout.

shown in preview mode of resource and rotate device

<string name="earth">Earth</string>

<string name="moon">Moon</string>

<string-array name="system"> <item>@string/earth</item> <item>@string/moon</item> </string-array>

strings.xml

<color name="gray">#eaeaea</color> <color name="titlebackgroundcolor">#00abd7</color> <color name="titlecolor">#666666</color><color name="opaque_red">#f00</color><color name="translucent_red">#80ff0000</color>

colors.xml

#RGB#ARGB#RRGGBB#AARRGGBB

  <dimen name="textview_height">25dp</dimen>    <dimen name="textview_width">150dp</dimen>    <dimen name="ball_radius">30dp</dimen>    <dimen name="font_size">16sp</dimen>

dimens.xml

  <bool name="screen_small">true</bool>    <bool name="adjust_view_bounds">true</bool>

bools.xml

dp stands for density independent pixels

It's relative to a 160 dpi screen. So 1dp is one pixel on a 160dpi screen.

Don't worry about calculating the dp's. Android does that for you.

Add resources from the Add Resources from the graphical editor and also manually.

#FFFFFF white

getResources(). getStringArray(R.array.whatever)

Navigating in Android Studioalt-1 is project view (alt-F1 is show it in project view)alt-2 is favorites (including bookmarks and breakpoints)alt-3 is the search view (cntl-shift-F to find)alt-4 run-consolealt-5 is debug alt-6 is android view (ddms, logcat)alt-7 is structure view (see members and methods)alt-9 is changes(VCS) view

Look at the margin of your project

Get helpcntl-shift-A (find anything in Android studio)

Searching (on mac, replace cntrl with command) cntl-F (find something in the local file)cntl-shift-F (find something in the project)

Go to file in code (on mac, replace cntrl with command) cntl-N (go to files typically in src)cntl-shift-n (go to any file, including res)cntl-E (open recent files)

Go to file in project alt-F1

Go to definition cntl-B (go directly to the method definition)

Javadocscntl-Q (open the javadocs)

Live Templatescntl-J

adding your own Live Templates (cntl-shift-A “live template”)

DebuggingUsing the debugger (alt-5)See bookmarks and breakpoints (alt-2)F11 to toggle bookmark

Using logcat (alt-6)

Using lint and AS analyzer: Analyze || Inspect Code

///TODO this is my todo message

Lifecycle in Android

proCapitalQuiz (in class)

labLifeCycle (in class)

Layouts in Android

6/9/12

6/9/12

6/9/12

layout_margin (layout means in relation to parent)padding

6/9/12

(layout means in relation to parent)

6/9/12

6/9/12

weight

6/9/12

FrameLayout

6/9/12

6/9/12

6/9/12

6/9/12

6/9/12

6/9/12

6/9/12

6/9/12