Know thy code
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This document discusses code review and the Android framework source code. It provides instructions on how to access and view the framework source code in Eclipse, as well as an alternate online source viewer. It gives examples of modifying framework classes like SeekBar and AsyncTask. Finally, it asks if there are any questions.
Know thy code
- 2. Know thy code ???.*What we wont know after this talkCode review secrets Know my code What we will learn from it ( Hopefully )How to make better use of framework sourceHow to make new components from the frameworkFramework
- 3. Android – Open Source Android has been available under a free software/open source license since October, 21 2008Google published the entire source code (including network and telephony stacks) under an Apache License.
- 4. Android – Open SourceSource available at source.android.com.Source is a bunch of git projects.Google built repo on top of git.Souce is ~3GB , needs ~10GB to build.Currently only builds on Linux and Mac
- 5. What code will we be seeing
- 6. Framework source in eclipseSource code from major release-specific branches can be downloaded like this:http://android.git.kernel.org/?p=platform/frameworks/base.git;a=snapshot;h=refs/heads/froyo;sf=tgzYou can get other versions by changing the branch name (froyo) in the link above (to donut, gingerbread, etc.)Links : https://bitly.com/bundles/rvyas/1
- 7. Framework source in eclipseExtract the android folder from <tarball>/core/java/ into android-sdk/platforms/<platform version>/sources/Make sure the platform-version is the same as the android version of the tarball.Refresh project in eclipse To test press Alt + Shift + T to check if you can view the activity class Source : http://kmansoft.wordpress.com/2011/01/27/android-sources-for-debugging/
- 9. Alternate “cloud” source viewerChrome extension : bit.ly/andsrcchrome Adds an 'ad' command to the Chrome Omnibox
- 10. Alternate “cloud” source viewer
- 12. Getting hands dirtypublicclassSeekBarextendsAbsSeekBarpublicabstractclassAbsSeekBarextendsProgressBarmThumbOffset= thumb.getIntrinsicWidth() / 2;setThumbPos(getWidth(), thumb, scale, Integer.MIN_VALUE);setThumbPos(w, thumb, scale, 0);Modified code : http://bit.ly/andvsb
- 13. Getting hands dirtyStory : HTTP Requests
- 14. Getting hands dirtypublicabstractclassAsyncTask<Params, Progress, Result> {privatestaticfinal String LOG_TAG = "AsyncTask";privatestaticfinalintCORE_POOL_SIZE = 5;privatestaticfinalintMAXIMUM_POOL_SIZE = 128;privatestaticfinalintKEEP_ALIVE = 10;privatestaticfinalBlockingQueue<Runnable> sWorkQueue =newLinkedBlockingQueue<Runnable>(10);privatestaticfinalThreadFactorysThreadFactory = newThreadFactory() {privatefinalAtomicIntegermCount = newAtomicInteger(1);public Thread newThread(Runnable r) {returnnew Thread(r, "AsyncTask #" + mCount.getAndIncrement()); } };
- 15. Performance examplespublicclassSQLiteDatabaseextendsSQLiteClosableAndroid implements locking in SQLiteDatabase- No point trying to hit the database from multiple threads- On the positive you don’t need to synchronize your requests.
Editor's Notes
- #2: Apologize
- #5: Repo unifies the many Git repositories when necessary, does the uploads to our revision control system, and automates parts of the Android development workflow. Repo is not meant to replace Git, only to make it easier to work with Git in the context of Android. The repo command is an executable Python script that you can put anywhere in your path