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Fix part of #140: Topic play animation #486

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Fix part of #140: Topic play animation #486

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ddc950a
Topic play animation
Nov 28, 2019
9d560a2
Minor bug fixes
Nov 28, 2019
2632149
Minor optimisation
Nov 29, 2019
ae1fb63
Final topic play animation
Nov 29, 2019
16c18aa
Remove unused code
Nov 29, 2019
faf8229
Nit renaming
Nov 29, 2019
f8b35e6
Merge remote-tracking branch 'upstream/develop' into topic-play-anima…
Dec 2, 2019
f288b1b
Updated test cases
Dec 2, 2019
bff5d30
updated chapter_list_container as ExpandableLayout for expand and col…
nikitamarysolomanpvt Dec 12, 2019
0a856e0
nit
nikitamarysolomanpvt Dec 12, 2019
6b7cf74
nit
nikitamarysolomanpvt Dec 12, 2019
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Remove unused code
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Rajat Talesra committed Nov 29, 2019
commit 16c18aa776f154dc2cbcef80a58f49b77375da64
3 changes: 0 additions & 3 deletions app/src/main/java/org/oppia/app/topic/play/StorySummaryAdapter.kt
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
package org.oppia.app.topic.play

import android.content.Context
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
Expand Down Expand Up @@ -141,7 +140,6 @@ class StorySummaryAdapter(
}

private fun expand(chapterListContainer: View) {
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I'm a bit confused by this. Why can't we rely on RecyclerView's own item animator for this? These animations seem a bit complex, and should really be tested directly since if they regress it will be hard for us to detect. I'd rather we rely on existing animation systems rather than creating our own Animation classes, if possible.

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I am actually not able to understand how can we do this using RecyclerView's animator?
Also, the main point behind introducing these animations were two fold:

  1. Make expand/collapse animation smooth.
  2. The animation time of expand, and arrow rotate all should be in sync.

I don't have much experience of automated animation, can you just give information regarding RecyclerView's item animator in more detail?
Thanks.

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Sure. I was thinking specifically DefaultItemAnimator, but I'm guessing that might not do the right thing. In which case, maybe something like https://stackoverflow.com/a/37453839 or another animator library might make this a bit easier if it's possible.

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@rt4914 rt4914 Dec 11, 2019 •
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This animation is applicable on recyclerview item. But here we want to expand and contract a linear layout, which is again within a recyclerview item.

Log.d("TAG", "expand")
chapterListContainer.clearAnimation()
val matchParentMeasureSpec =
View.MeasureSpec.makeMeasureSpec((chapterListContainer.parent as View).width, View.MeasureSpec.EXACTLY)
Expand Down Expand Up @@ -171,7 +169,6 @@ class StorySummaryAdapter(
}

private fun collapse(chapterListContainer: View) {
Log.d("TAG", "collapse")
chapterListContainer.clearAnimation()

val initialHeight = chapterListContainer.measuredHeight
Expand Down
9 changes: 0 additions & 9 deletions app/src/main/res/drawable/ic_arrow_drop_up_black_24dp.xml
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