JS API to know if answer is displaying or question

[krmanik]

Pull Request template

Purpose / Description

Describe the problem or feature and motivation

It will be easier to know when question is displaying and answer using js api. I am implementing addon sometime card content only need to added to front side and some time to back side. So, there are no api to know the side of card.

Fixes

Fixes Link to the issues.

Approach

1. Using JavascriptInterface
2. Using AbstractFlashcardViewer::isDisplayingAnswer()

How Has This Been Tested?

1. Tested on Nexus 5 emulator
2. Add following to front/back side of card template to know if card currently displaying answer

console.log(AnkiDroidJS.ankiIsDisplayingAnswer());

Return value: true or false

Learning (optional, can help others)

https://developer.android.com/reference/android/webkit/JavascriptInterface

Checklist

Please, go through these checks before submitting the PR.

• [ x ] You have not changed whitespace unnecessarily (it makes diffs hard to read)
• [ x ] You have a descriptive commit message with a short title (first line, max 50 chars).
• [ x ] Your code follows the style of the project (e.g. never omit braces in if statements)
• [ x ] You have commented your code, particularly in hard-to-understand areas
• [ x ] You have performed a self-review of your own code
• [ x ] UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• [ x ] UI Changes: You have tested your change using the Google Accessibility Scanner

[codecov]

Codecov Report

Merging #8199 (91bf179) into master (4481bad) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #8199      +/-   ##
============================================
- Coverage     37.04%   37.02%   -0.03%     
  Complexity     3776     3776              
============================================
  Files           352      352              
  Lines         35739    35740       +1     
  Branches       4732     4732              
============================================
- Hits          13239    13232       -7     
- Misses        20992    21001       +9     
+ Partials       1508     1507       -1     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/ichi2/anki/AbstractFlashcardViewer.java	39.44% <0.00%> (-0.03%)	166.00 <0.00> (ø)
...src/main/java/com/ichi2/anki/CollectionHelper.java	29.31% <0.00%> (-2.59%)	21.00% <0.00%> (ø%)
...Droid/src/main/java/com/ichi2/libanki/Storage.java	31.83% <0.00%> (-1.80%)	18.00% <0.00%> (ø%)
...java/com/ichi2/anki/dialogs/CustomStudyDialog.java	32.45% <0.00%> (-1.32%)	11.00% <0.00%> (ø%)
...iDroid/src/main/java/com/ichi2/libanki/Finder.java	79.00% <0.00%> (-0.41%)	138.00% <0.00%> (ø%)
...src/main/java/com/ichi2/libanki/sched/SchedV2.java	81.20% <0.00%> (-0.15%)	401.00% <0.00%> (-1.00%)
.../src/main/java/com/ichi2/async/CollectionTask.java	36.75% <0.00%> (+0.22%)	16.00% <0.00%> (ø%)
AnkiDroid/src/main/java/com/ichi2/libanki/DB.java	87.60% <0.00%> (+0.82%)	42.00% <0.00%> (+1.00%)
...roid/src/main/java/com/ichi2/utils/JSONObject.java	49.16% <0.00%> (+1.66%)	31.00% <0.00%> (ø%)
...id/src/main/java/com/ichi2/utils/VersionUtils.java	21.62% <0.00%> (+5.40%)	1.00% <0.00%> (ø%)

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[mikehardy]

This works for me - thanks @infinyte7 - and thank you (again) for your infinite patience on reviewing the JS add-on PR.

[mikehardy]

Hi there!

Just a friendly notice (one per person for PRs merged in March, regardless of PR quantity) that we try to process OpenCollective payments monthly - it's time for March 2021 submissions

If you are interested in compensation for this work, the process with details is here:

https://github.com/ankidroid/Anki-Android/wiki/OpenCollective-Payment-Process#how-to-get-paid

Thanks!