1. https://medium.com/@nullthemall/diffutil-is-a-must-797502bc1149#.7kck0cqz0

Research into the most appropriate analytics tool for the app and implement on the decided tool.

1. https://stackoverflow.com/questions/36529238/how-to-use-autovalue-with-retrofit-2
2. http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/

Current icon will be a generic from stock photos.

Each card (Weather report, rover buttons) slides up individually on 'onCreate' of the home activity.

Changes to be made to the grid layout -

1. Image details partially overlapping their respective images - Done.
2. Spacing around the columns - Done.
3. Loading animation on pagination - Done.
4. Make collapsible toolbar smoother on expansion and contraction - Seems to be smooth.
5. Grid items scroll up animation - Done.
6. Pull down to refresh - Done.

MAAS API (http://marsweather.ingenology.com/v1/latest/) seems to have broken down; 502 Bad Gateway. It has not been fixed for days now.

Alternative could be http://cab.inta-csic.es/rems/wp-content/plugins/marsweather-widget/api.php

https://stackoverflow.com/questions/33134031/is-there-a-safe-way-to-manage-api-keys

Line graph to show the frequency of images being taken.

Ability for the user to zoom into expanded images.

1. https://developer.android.com/guide/topics/resources/runtime-changes.html
2. http://code.hootsuite.com/orientation-changes-on-android/

Keep track of all TODOs in Android Studio.

1. https://developer.android.com/training/articles/memory.html
2. https://developer.android.com/studio/profile/investigate-ram.html
3. https://stackoverflow.com/questions/8177802/garbage-collection-in-android-done-manually
4. https://developer.android.com/training/displaying-bitmaps/index.html
5. http://doublenegative.com/android-fragments-and-memory/

Loading multiple tabs makes the app stutre and ultimately crash with "OutOfMemoryException".

http://choosealicense.com/

ReactiveX/RxAndroid#348

User should be able to directly navigate to a specific SOL (maybe even date) via an input option.

1. A general information page for every rover.
2. Maybe make a backend to update the information via an API.

1. Shared element transition occasionally gets stuck when navigating from Main Activity to Explore Activity. This is observed specially when user taps on a rover button navigates to Explore activity, returns and then taps on another rover button.
2. The transition is not smooth on navigating from explore fragment to expanded view and on navigating back.

Add a progress animation (or any indicator) while the weather is being fetched.

Handle errors highlighted by the APIs.

Exmaple -
Case of no data for a particular SOL : https://api.nasa.gov/mars-photos/api/v1/rovers/Spirit/photos?sol=2202&api_key=pnfYfjK3FhG77VCRO2ZwtjI4w9hq0fXRozkZ0VbY

How to -

1. https://futurestud.io/tutorials/retrofit-2-simple-error-handling
2. https://stackoverflow.com/questions/33774940/get-response-status-code-using-retrofit-2-0-and-rxjava

https://material.google.com/components/grid-lists.html

https://github.com/rharter/auto-value-gson/blob/master/README.md#factory

Check Leak Canary reports.

Create an 'About' page that'll show usual 'About' information.

1. Loading animation on first load.
2. Illustration on no data.
3. Illustration on network fail.

https://guides.codepath.com/android/Shared-Element-Activity-Transition

https://developer.chrome.com/multidevice/android/customtabs

1. Expand image on tap.
2. Give zoom in capabilities.
3. Save/ Download option.
4. Show available details of the image (eg. Camera)

1. https://www.jayway.com/2015/03/11/automatic-versioncode-generation-in-android-gradle/
2. Release labels - https://github.com/krtkush/MarsExplorer/releases

Currently, the user has to go back to the image grid section from the expanded image activity to select a new image. For a better UX, the user should be able to swipe left/right and move on to the next/previous image respectively.

A simple toggle on the home screen that can enable user to select temperature unit preference. The preference becomes the default unit for that user.

The API has been changed and pagination has been removed.

corincerami/mars-photo-api#35