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Fix the a11y focus problem in a long list page

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While a page is scrolling to the target position, the target can't
request a11y focus, and the highlight blink animation at the moment is
also invisible.

The patch is to skip the unseen highlight animation and focus operation
when onBindViewHolder() is called before scrolling. Therefore, when the
scrolling stops, the scroll listener will notify the item changed and
onBindViewHolder() will be called again to do the operations.

Also decrease the delay time of the scrolling start to make the a11y
smoother.

Bug: 318459003
Test: manual, robotest
Change-Id: Ie55b2edeb7e1feaaadb5e670f39f07f6f17b92b9
This commit is contained in:
Jason Chiu
2024-04-01 17:29:59 +08:00
parent fd6ae421fd
commit 3f0eefbd37
2 changed files with 57 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/com/android/settings/widget/HighlightablePreferenceGroupAdapter.java
View File

@@ -40,6 +40,7 @@ import androidx.recyclerview.widget.RecyclerView.ViewHolder;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.accessibility.AccessibilityUtil;
import com.google.android.material.appbar.AppBarLayout;
@@ -50,6 +51,8 @@ public class HighlightablePreferenceGroupAdapter extends PreferenceGroupAdapter
static final long DELAY_COLLAPSE_DURATION_MILLIS = 300L;
@VisibleForTesting
static final long DELAY_HIGHLIGHT_DURATION_MILLIS = 600L;
@VisibleForTesting
static final long DELAY_HIGHLIGHT_DURATION_MILLIS_A11Y = 300L;
private static final long HIGHLIGHT_DURATION = 15000L;
private static final long HIGHLIGHT_FADE_OUT_DURATION = 500L;
private static final long HIGHLIGHT_FADE_IN_DURATION = 200L;
@@ -59,6 +62,7 @@ public class HighlightablePreferenceGroupAdapter extends PreferenceGroupAdapter
@VisibleForTesting
boolean mFadeInAnimated;
private final Context mContext;
private final int mNormalBackgroundRes;
private final String mHighlightKey;
private boolean mHighlightRequested;
@@ -102,12 +106,12 @@ public class HighlightablePreferenceGroupAdapter extends PreferenceGroupAdapter
super(preferenceGroup);
mHighlightKey = key;
mHighlightRequested = highlightRequested;
final Context context = preferenceGroup.getContext();
mContext = preferenceGroup.getContext();
final TypedValue outValue = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
mContext.getTheme().resolveAttribute(android.R.attr.selectableItemBackground,
outValue, true /* resolveRefs */);
mNormalBackgroundRes = outValue.resourceId;
mHighlightColor = context.getColor(R.color.preference_highlight_color);
mHighlightColor = mContext.getColor(R.color.preference_highlight_color);
}
@Override
@@ -121,12 +125,11 @@ public class HighlightablePreferenceGroupAdapter extends PreferenceGroupAdapter
View v = holder.itemView;
if (position == mHighlightPosition
&& (mHighlightKey != null
&& TextUtils.equals(mHighlightKey, getItem(position).getKey()))) {
&& TextUtils.equals(mHighlightKey, getItem(position).getKey()))
&& v.isShown()) {
// This position should be highlighted. If it's highlighted before - skip animation.
v.requestAccessibilityFocus();
addHighlightBackground(holder, !mFadeInAnimated);
if (v != null) {
v.requestAccessibilityFocus();
}
} else if (Boolean.TRUE.equals(v.getTag(R.id.preference_highlighted))) {
// View with highlight is reused for a view that should not have highlight
removeHighlightBackground(holder, false /* animate */);
@@ -157,13 +160,14 @@ public class HighlightablePreferenceGroupAdapter extends PreferenceGroupAdapter
// Remove the animator as early as possible to avoid a RecyclerView crash.
recyclerView.setItemAnimator(null);
// Scroll to correct position after 600 milliseconds.
// Scroll to correct position after a short delay.
root.postDelayed(() -> {
if (ensureHighlightPosition()) {
recyclerView.smoothScrollToPosition(mHighlightPosition);
highlightAndFocusTargetItem(recyclerView, mHighlightPosition);
}
}, DELAY_HIGHLIGHT_DURATION_MILLIS);
}, AccessibilityUtil.isTouchExploreEnabled(mContext)
? DELAY_HIGHLIGHT_DURATION_MILLIS_A11Y : DELAY_HIGHLIGHT_DURATION_MILLIS);
}
private void highlightAndFocusTargetItem(RecyclerView recyclerView, int highlightPosition) {