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QS - Fix race condition in accessibility

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When users try to open panel, initialization of accessibility is called
in Main Thread by this callstack.

at android.view.ViewGroup.buildOrderedChildList
at android.view.View.populateAccessibilityNodeInfoDrawingOrderInParent
at android.view.View.onInitializeAccessibilityNodeInfoInternal
at android.view.View.onInitializeAccessibilityNodeInfo
at android.view.View.createAccessibilityNodeInfoInternal
at android.view.View.createAccessibilityNodeInfo
at android.view.accessibility.AccessibilityRecord.setSource
...
at android.view.View.setFlags
at android.view.View.setVisibility
at com.android.systemui.qs.QSContainer.updateQsState
at com.android.systemui.qs.QSContainer.setExpanded
at com.android.systemui.statusbar.phone.NotificationPanelView.updateQsState

And another initialization is tried in QSTileHost Thread by this callstack.

at android.view.ViewGroup.buildOrderedChildList
at android.view.View.populateAccessibilityNodeInfoDrawingOrderInParent
at android.view.View.onInitializeAccessibilityNodeInfoInternal
at android.view.ViewGroup.onInitializeAccessibilityNodeInfoInternal
at android.view.View.onInitializeAccessibilityNodeInfo
at android.view.View.createAccessibilityNodeInfoInternal
at android.view.View.createAccessibilityNodeInfo
at android.view.accessibility.AccessibilityRecord.setSource
...
at android.view.View.announceForAccessibility
at com.android.systemui.qs.QSPanel.onAnnouncementRequested
at com.android.systemui.qs.QSTile.handleStateChanged

This race condition can cause crashes, because the same ArrayList
(mPreSortedChildren or mTempArrayList in ViewGroup) is modified by two
different thread.

Test : manual

Change-Id: I9e0ad1fef4be7dc378463c06d10854e0e4c5b3d6
This commit is contained in:
dooyoung.hwang
2016-12-22 20:04:20 +09:00
committed by Dooyoung Hwang
parent 5e055b6a18
commit 1b0066230e
1 changed files with 7 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
packages/SystemUI/src/com/android/systemui/qs/QSPanel.java
View File

@@ -345,7 +345,10 @@ public class QSPanel extends LinearLayout implements Tunable, Callback {
@Override
public void onAnnouncementRequested(CharSequence announcement) {
announceForAccessibility(announcement);
if (announcement != null) {
mHandler.obtainMessage(H.ANNOUNCE_FOR_ACCESSIBILITY, announcement)
.sendToTarget();
}
}
};
r.tile.addCallback(callback);
@@ -514,10 +517,13 @@ public class QSPanel extends LinearLayout implements Tunable, Callback {
private class H extends Handler {
private static final int SHOW_DETAIL = 1;
private static final int SET_TILE_VISIBILITY = 2;
private static final int ANNOUNCE_FOR_ACCESSIBILITY = 3;
@Override
public void handleMessage(Message msg) {
if (msg.what == SHOW_DETAIL) {
handleShowDetail((Record)msg.obj, msg.arg1 != 0);
} else if (msg.what == ANNOUNCE_FOR_ACCESSIBILITY) {
announceForAccessibility((CharSequence)msg.obj);
}
}
}