Add a guide about creating home screen widgets:

• http://www.vogella.com/tutorials/AndroidWidgets/article.html
• https://www.youtube.com/watch?v=p_ZjPb_opVQ
• http://www.tutorialspoint.com/android/android_widgets.htm
• https://developer.android.com/guide/topics/appwidgets/index.html

I realise this is very much a matter of taste, but it may be worth noting on the Organizing-your-Source-Files page that the Android API favours singular names for things, not plurals.

E.g., it's android.widget, not android.widgets.

So it may make more sense to follow that convention, especially if you plan on writing anything that would naturally be named similarly. For example, you chould put any custom widgets you've written in to com.example.myapp.widget.SomeWidget, not com.example.myapp.widgets.SomeWidget.

I have been looking around for some areas that may have how to add an expansion to apks in Cliff notes style and I was curious if you all had any intention in creating an area for that?

It would be nice to have a section which explains how to add existing libraries in Android Studio and probably Eclipse too. I recently had a lot of trouble using Android Studio and couldn't find clear explanations on the subject. I finally got it working after a few tries.

• Getting user profile information
• Getting account information for twitter or other

http://stackoverflow.com/questions/2112965/how-to-get-the-android-devices-primary-e-mail-address
https://gist.github.com/remelpugh/4072663
http://geekgarage.dad3zero.net/contact-informations-and-respect-privacy-android-development/
http://developer.android.com/reference/android/telephony/TelephonyManager.html
http://developer.android.com/reference/com/google/android/gms/common/AccountPicker.html

It would be helpfull to have a part to explain how to publish on the google play store and how to use the different release (alpha, beta, prod) + a part about proguard.

I figured that since there were some extensive changes to Genymotion due to the google crackdown that we should update the Genymotion setup for google mapv2 and in general. At the moment, I would argue Genymotion is unstable for development of apps that require google play services. I've found adding in the google play services using the provided zip to new virtual devices can cause a lot of issues.

Followed this tutorial verbatim. Got upto the part where it should populate ListView before it breaks into the detailed section, it is not currently doing anything. I think there is something wrong with the logic of this Fetch of Data. The tutorial never points out where to call fetchBoxOfficeMovies(); it just sorta has the user guess. Plus you shouldn't give a list adapter a empty arraylist, then call fetchBoxOfficeMovies(); and add the results to the array adapter like it says with adapterMovies.add(movie); .. Instead you should fetch the results and store the results in the arraylist onSuccess, then pass that arraylist into the array adapter. The events need to be chained. let me know if you need a copy of my code to see why it isnt working.

Not sure if this is the desired behavior, but whenever I click on one of the items in the navigation pane to jump to a category, the pane disappears until the animation to get to the category is complete.

The announcement can be found here.

We should update the gradle guide as soon as possible.

Add wiki page on receiving SMS using a service.

A quick guide for people wanting an alternative to ActiveAndroid, which is currently the only cliffnoted third party ORM, would be swell.

I found some sources about ProGuard and obfuscation in general

• http://developer.android.com/intl/ru/tools/help/proguard.html
• http://www.crashlytics.com/blog/mastering-proguard-for-building-lightweight-android-code/

debugging point by point I realized that GetArguments () returns null in onCreate in the constructor of my fragment I get good parameters, but in the OnCreate returns null

Fragment fragment = new Fragment();
    Bundle args = new Bundle();

    switch (position) {
        case 0:
            fragment = new Fragment_1(); // Fragment 1
            args.putInt(Fragment_1.ARG_FRAGMENT_1, position + 1);
            fragment.setArguments(args);
            Fragment_1.newInstance(descripcion_local);


            break;

from a shipping case and I receive data either in the constructor

public class Fragment_1 extends Fragment {
    public static final String ARG_FRAGMENT_1 = "section_number_1";
    TextView textView;
    private String descip;

    public static  Fragment_1 newInstance(String descripcion) {
        Fragment_1 fragmentFirst = new Fragment_1();
        Bundle args = new Bundle();
        args.putString("descripcion", descripcion);

        fragmentFirst.setArguments(args);
        return fragmentFirst;


    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        descip = getArguments().getString("descripcion");

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.v_tab_desc, container,  false);

        textView = (TextView) rootView.findViewById(R.id.descripcion_desc);
        textView.setText(descip);



        return rootView;
    }


}

it would be fine if exists .mobi or .epub version. great job man!

Please delete me

• Venue established -- Realm (148 Townsend, 3rd and Townsend)
• Publish the meta talk
• Get 10 people on the talk spreadsheet
  • Tony Constantinides
  • Ari Lacenski
  • Chris Bowns (Ari's coworker)
  • Shine Garg
  • Jean Rintoul
  • Eddie Freedman
  • Kristina Frost
  • Michael Huff
  • Andrew Lew?
  • ... ? :)
• Date: October 18, 2014!
• Signup sheet: https://docs.google.com/spreadsheets/d/1jE0gl8pZFjupClDumHQf7C5TQGviJyqvTRUej3cg6y4/edit#gid=0

Dependency injection support which is offered by Dagger tool can make our lives more pleasant. Moreover, writing tests is more easier.

I would enjoy contributing to a guide about this. Let me know if you have an interest.

Hello,
im implementing EndlessScrollListener inside fragment.
I fetch data from web service and fill a list.
I saw that you implement EndlessScrollListener inside onCreate in Activity.
Where dou you suggest implementing it in Fragment?
Tried inside onCreateView but nothing happens..
Thank you in advance.

• Interpolations

Hi Nathan (@nesquena). I had a question about the android guide - https://github.com/thecodepath/android_guides/wiki/Sending-and-Managing-Network-Requests#displaying-remote-images-the-hard-way.

I followed along the tutorial and tried loading and displaying remote images in a ListView without using an third party library. It seems to work for a single image url, but when you have an ArrayList of image urls that you're looping through with the help of an Adapter, I think the AsyncTask is loading all the images into each ImageView - so each ImageView in the ListView loops through and displays all images one by one.

My code is here - https://github.com/medha/Panache. Any idea why this could be happening? I feel the AsyncTask takes its time to load the images, and when onPostExecute() is called, maybe it has so many images in the buffer that it loads them all?

Thanks,
Medha

It would be a good resource to have a list of all the apps that are useful for developers or representing a demo of a library

Two Examples:

https://play.google.com/store/apps/details?id=it.gmariotti.cardslib.demo

https://play.google.com/store/apps/details?id=org.routine_work.android_r

The current description of AsyncTask is "AsyncTask is a mechanism for executing long running operations in a background thread without having to manually handle thread creation or execution.".
However, in the official Android API AsyncTask has the following description ".. AsyncTasks should ideally be used for short operations (a few seconds at the most)".
It goes on to mention "If you need to keep threads running for long periods of time, it is highly recommended you use the various APIs provided by the java.util.concurrent pacakge such as Executor, ThreadPoolExecutor and FutureTask."
Based on the above I recommend a revision of the AsyncTask description.

Parse is pretty great for prototyping concepts, should have community condensed parse tutorials for:

• Data
• Push
• Analytics
• Social

References:

• https://parse.com/apps/quickstart#android/native/existing
• https://parse.com/docs/android_guide#objects-classes
• https://parse.com/tutorials/mealspotting

I've been trying to set up a RemoteControlClient to display the Mediaplayer's current item on the Lockscreen, but not had much luck. There aren't many guides available on how to do this.

A proper integration guide would be very helpful to myself, and others.

Cheers!

Hi all,
I think ACRA is one of the most important libraries for Android developers as it allows you to catch every single bug (well, almost :-)) in your app. You can find details here http://acra.ch/

Let me know if you like the idea. I can prepare a draft, but my writing will require some editing since I am not a native speaker.

BR,
Yuriy

Guide on managing callback complexity

Could you please send me some code example for structuring a chain of callbacks?

For example using includes to join data or ParseRelation to load associations.

Also, move the callbacks into an object with each request in a method and then use an interface to send out the requests (pseudo-code):

class ObjectFetcher {
    public interface FetcherCallbacks {
         void onFirstDataLoaded(Model impartialData);
         void onAllDataLoaded(Model data);
    }

    FetcherCallbacks callback;
    int requestsLoadedFlag = 0;

    public ObjectFetcher(FetcherCallbacks callback) {
     this.callback = callback;
    }

    public void loadAll() {
         sendFirstRequest();
         sendSecondRequest();
         sendThirdRequest(); 
    }

    private void sendFirstRequest() {
          object.findAllInBackground(new Parse {
               void onDone(Error error) {
                    requestsLoadedFlag +=1;
                     // STORE DATA IN MEMBER VARIABLE HERE
                    callback.onFirstDataLoaded(data);
                    sendFinalDataWhenReady();
               }
          });
    }

    private void sendSecondRequest() {
          object.findAllInBackground(new Parse {
               void onDone(Error error) {
                    requestsLoadedFlag +=1;
                    // STORE DATA IN MEMBER VARIABLE HERE
                    sendFinalDataWhenReady();
               }
          });
    }

   private void sendThirdRequest {
       object.findAllInBackground(new Parse {
               void onDone(Error error) {
                    requestsLoadedFlag +=1;
                    // STORE DATA IN MEMBER VARIABLE HERE
                    sendFinalDataWhenReady();
               }
        }
   } 

   private void sendFinalDataWhenReady() {
      if (requestsLoadedFlag == 3) {
          callback.onAllDataLoaded(data1, data2, data3);
      } 
   }
}

and then use with something like:

ObjectFetcher fetcher = new ObjectFetcher(new FetcherCallbacks() {
     void onFirstDataLoaded {
          // … callback fired here
     }

    void onAllDataLoaded {
          // … callback fired here
     }
})

Note that this is psuedocode but hope it gives you an idea of how to manage things using objects and interface callbacks.

Add a guide outlining how to use espresso /cc @boes-matt

• Robotium vs Espresso
• https://code.google.com/p/android-test-kit/wiki/EspressoStartGuide
• https://code.google.com/p/android-test-kit/wiki/Espresso
• https://code.google.com/p/android-test-kit/wiki/Espresso#Espresso_Setup_Instructions
• https://github.com/boes-matt/TestProject

We've created a first stab at a hosted version of the wiki which should include:

• Full indexed search of wiki content
• Better look and feel (eventually)
• Table of contents for each page (quick jumping between sections)
• Eventually support multiple development platforms

Here's the start (borrowing from github wiki style and powered by the git wiki): http://guides.thecodepath.com/android

If anyone can help out with the design, please reach out to me at nathan (at) thecodepath (dot) com

I think it would be good if there was a guide on the implementation/usage of the in-app billing library

P.S. work guys! Even as a more experienced developer I have learned some new things here :)

Broken link:

"If we want to embed the test project within our existing application within a folder, check out this step-by-step guide."

Found on this page:

http://guides.codepath.com/android/Android-Unit-and-Integration-testing#android-testing-framework

After some limited googling, it seems that this set of instructions was for Eclipse, and some further googling suggests that a test/ subdirectory inside a project (possibly a subproject) seems to cause problems in Eclipse. Here's is Google's documentation for testing inside Eclipse: http://developer.android.com/tools/testing/testing_eclipse.html

Having a testing subdirectory inside a project doesn't seem to be a problem in Android Studio. Here is a video how to do this (not necessarily the greatest video, but a good one): https://www.youtube.com/watch?v=z47B1nhC3K0

I'll leave it to more experienced Android developers to decide how to rewrite this section.

If you want to build your apps in way that they have loose coupling between blocks, which could be switched in very easy way you definitely have to read about Otto!.
In short, Otto is an event bus designed to decouple different parts of your application.

I would enjoy contributing to a guide about this. Let me know if you have an interest.

Take a stab at a first version of https://github.com/thecodepath/android_guides/wiki/Settings-with-PreferenceFragment

once applied the Adapter, I want to change a textfield and some images that are the FirstGragment, that way I can do

question from MainActivity Adapter after this,

TextView textview = (TextView) findViewById (R.id.descripcion_desc);
         textView.setText (text);

but the app falls.

Cliffnotes on alternate resources and screen densities

http://developer.android.com/training/multiscreen/index.html
http://developer.android.com/training/multiscreen/screendensities.html
http://stackoverflow.com/a/14947815/313399

I think that it would be nice to have a tutorial on things to keep and things to release and rebuild on screen orientation changes as well as nice ways to do it on asyncs, fragments, dialogs, dialogFragments, and activities.

I think the Interaction and Navigation category is a bit too long and interlaced. Intents is a large enough topic that, with some growth, it could be put into it's own category.

I suggest the hierarchy (using the existing pages):

Interaction

• View Event Listeners (Clicks, Key Presses, Updates)
• Exploring the ActionBar (includes adding ActionItems)
• Displaying Toasts (Quick notices and includes custom views)
• Common Navigation Paradigms (i.e Tabs, Swipe-able Views, Pull-out Drawer)
• Extended ActionBar Guide (Split-bar, Custom ActionBar, etc)
• Gestures and Touch Events (Swipe, Shake, or Dragging Events)
• Menus and Popups (Context Menu, PopupMenu, PopupWindow)
• Dialogs with DialogFragment (Displaying a content overlay)

Intents

• Navigating Activities with Intents (Communicating between Activities)
• Common Implicit Intents (Making a Call, Sending a Text, Opening a URL)
• Sharing Content with Intents (and ShareActionProvider)
• Navigation and Task Stacks (Controlling the behavior of the task stack)

I have tried the same way and the same jar what you have mentioned i am getting the below error.Its seems its trying to download something from maven repo infact i am using ant build.

Unable to resolve artifact: Missing:

1. org.ccil.cowan.tagsoup:tagsoup:jar:1.2

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.ccil.cowan.tagsoup -DartifactId=tagsoup -Dversion=1.2 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.ccil.cowan.tagsoup -DartifactId=tagsoup -Dversion=1.2 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) org.apache.maven:super-pom:pom:2.0
2) org.ccil.cowan.tagsoup:tagsoup:jar:1.2

2. org.json:json:jar:20080701

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.json -DartifactId=json -Dversion=20080701 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.json -DartifactId=json -Dversion=20080701 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) org.apache.maven:super-pom:pom:2.0
2) org.json:json:jar:20080701

3. org.robolectric:android-all:jar:4.1.2_r1-robolectric-0

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.robolectric -DartifactId=android-all -Dversion=4.1.2_r1-robolectric-0 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.robolectric -DartifactId=android-all -Dversion=4.1.2_r1-robolectric-0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) org.apache.maven:super-pom:pom:2.0
2) org.robolectric:android-all:jar:4.1.2_r1-robolectric-0

3 required artifacts are missing.

for artifact:
org.apache.maven:super-pom:pom:2.0

from the specified remote repositories:
sonatype (https://oss.sonatype.org/content/groups/public/),
central (http://repo1.maven.org/maven2)

at org.apache.maven.artifact.ant.DependenciesTask.doExecuteResolution(DependenciesTask.java:268)
at org.apache.maven.artifact.ant.DependenciesTask.doExecute(DependenciesTask.java:168)
at org.apache.maven.artifact.ant.AbstractArtifactTask.execute(AbstractArtifactTask.java:751)
at org.robolectric.MavenDependencyResolver.getLocalArtifactUrls(MavenDependencyResolver.java:32)
at org.robolectric.CachedDependencyResolver.getLocalArtifactUrls(CachedDependencyResolver.java:47)
at org.robolectric.RobolectricTestRunner.createRobolectricClassLoader(RobolectricTestRunner.java:167)
at org.robolectric.RobolectricTestRunner.createSdkEnvironment(RobolectricTestRunner.java:137)
at org.robolectric.RobolectricTestRunner$3.create(RobolectricTestRunner.java:324)
at org.robolectric.EnvHolder.getSdkEnvironment(EnvHolder.java:21)
at org.robolectric.RobolectricTestRunner.getEnvironment(RobolectricTestRunner.java:322)
at org.robolectric.RobolectricTestRunner.access$300(RobolectricTestRunner.java:63)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:219)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:194)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Caused by: org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException: Missing:

1. org.ccil.cowan.tagsoup:tagsoup:jar:1.2

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.ccil.cowan.tagsoup -DartifactId=tagsoup -Dversion=1.2 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.ccil.cowan.tagsoup -DartifactId=tagsoup -Dversion=1.2 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) org.apache.maven:super-pom:pom:2.0
2) org.ccil.cowan.tagsoup:tagsoup:jar:1.2

2. org.json:json:jar:20080701

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.json -DartifactId=json -Dversion=20080701 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.json -DartifactId=json -Dversion=20080701 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) org.apache.maven:super-pom:pom:2.0
2) org.json:json:jar:20080701

3. org.robolectric:android-all:jar:4.1.2_r1-robolectric-0

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=org.robolectric -DartifactId=android-all -Dversion=4.1.2_r1-robolectric-0 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.robolectric -DartifactId=android-all -Dversion=4.1.2_r1-robolectric-0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) org.apache.maven:super-pom:pom:2.0
2) org.robolectric:android-all:jar:4.1.2_r1-robolectric-0

3 required artifacts are missing.

for artifact:
org.apache.maven:super-pom:pom:2.0

from the specified remote repositories:
sonatype (https://oss.sonatype.org/content/groups/public/),
central (http://repo1.maven.org/maven2)

at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:360)
at org.apache.maven.artifact.ant.DependenciesTask.doExecuteResolution(DependenciesTask.java:263)
... 27 more

@nesquena I am using this library for reverse endless scrolling in a listview. I am facing a issue, once it starts scrolling, it keeps on scrolling to the start of the listview in a loop. I have a listView with android:stackFromBottom="true" and android:transcriptMode="normal". Is there a way to do this?

Easy ways to create filtered lists that filters based on what is being searched for.

Can you do a tutorial on Square's Retrofit? Its a pretty popular REST client for Android. The tutorial on their page might be a bit too difficult to understand for a beginner. https://github.com/square/retrofit

Issue for people that have questions about potential changes on the wiki. Post any questions or discussions here.

While trying to do both iOS and Android development, I really like Cocoapods for managing dependencies and discover other libraries to use.

Does Android have something similar?

One thing that would be helpful, if it's possible, is images to accompany some of the articles, especially those working with graphics or animation.

• http://acupofdev.wordpress.com/2011/10/04/android-popupwindow/
• http://rajeshandroiddeveloper.blogspot.com/2013/07/android-popupwindow-example-in-listview.html

Can we add this library ?

• Picasso - A powerful image downloading and caching library for Android.

Reference

• http://square.github.io/picasso/

Hello , im using the endless adapter in my project and i noticed that when first loading activity, it triggers twice the web service method that populates the grid with data. I use a custom adapter.
Also im getting the feeling that it is replacing the data in grid view and not appending them.

My code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.grid_view);

    gridlist = (GridView) findViewById(R.id.gridImages);
    gridlist.setOnScrollListener(new EndlessScrollListener() {
        @Override
        public void onLoadMore(int page, int totalItemsCount) {

            // this is calling the web service and is being called twice onCreate
            createQuery(searchterm);
        }
    });
});

its there anything that i can do to have a smoother effect for appending data to grid view and not loading twice.

The tutorial implies that the code for onCreate should look like this:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_todo);

    lvItems = (ListView) findViewById(R.id.lvItems);
    itemsAdapter = new ArrayAdapter<String>(this,   
            android.R.layout.simple_list_item_1, items);
    lvItems.setAdapter(itemsAdapter);
    setupListViewListener();

    readItems();        
}

but I find that it has to look this way:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_todo);

    lvItems = (ListView) findViewById(R.id.lvItems);
    readItems();        
    itemsAdapter = new ArrayAdapter<String>(this,   
            android.R.layout.simple_list_item_1, items);
    lvItems.setAdapter(itemsAdapter);
    setupListViewListener();
}

Otherwise I get array out of bounds exceptions when I try to delete items.

This is the master list of things that need to be added / improved on the cliffnotes. If you see an important topic missing here, please reply below!

Incomplete stubs that need attention to be completed (please help out if you can):

• Advanced Architecture Guides
• Profiling Performance or Memory
• Real-time Chat with Push
• Drawing with SurfaceView
• Bluetooth API

A few topics we could use help developing cliffnotes for:

• Wearables Guides
• WiFi, NFC Connectivity APIs
• Creating an App Widget (#40)
• Google Play In-app Billing (#27)
• Custom Camera with Camera 2 API
• AccountManager (#49)
• AsyncTaskLoader
• SyncAdapter
• Lollipop Job Scheduler (#74)
• Geofencing API (#192)

Production Topics:

• Building Responsive Android Apps
• Checklist on preparing for public release
• I18n and Localization guide
• Guide on beta testing in lead up to launch

Workflow Tools:

• Crashlytics
• Stripe (#73)
• OTA
• Facebook SDK
• Updated Jenkins
• Advanced Gradle (Flavors, Tasks, Deps)

More advanced topics that could use cliffnotes by experts:

• Creating a Custom Keyboard (#137)
• Security for Android
• Native Development Kit (NDK)
• Binder Inter-Process Communications (See Here)

Any help starting these cliffnotes would be appreciated! Feel free to add other requests as an issue or to this thread! If you are interested in contributing, please check out the contributing guidelines to understand the philosophy of the guides.

NFC is a cool feature on a lot of the newer android phones that is underutilized.

I just created a app that utilizes this technology: http://www.eriktaheri.com/project/interactive-museum-exhibit/

I would enjoy contributing to a guide about this technology. Let me know if you have an interest!