Send LockPatternView accessibility announcements before callbacks

This allows the pattern's listener to optionally send accessibility
announcements that interrupt the defaults, rather than the view always
interrupting the listener.

Bug: 7256500
Change-Id: Ief2f5cc2fae76a3becc1321d14d46f97b3092215

Author: alanv

core/java/com/android/internal/widget/LockPatternView.java

@@ -375,31 +375,31 @@ public void setDisplayMode(DisplayMode displayMode) {
     }
 
     private void notifyCellAdded() {
+        sendAccessEvent(R.string.lockscreen_access_pattern_cell_added);
         if (mOnPatternListener != null) {
             mOnPatternListener.onPatternCellAdded(mPattern);
         }
-        sendAccessEvent(R.string.lockscreen_access_pattern_cell_added);
     }
 
     private void notifyPatternStarted() {
+        sendAccessEvent(R.string.lockscreen_access_pattern_start);
         if (mOnPatternListener != null) {
             mOnPatternListener.onPatternStart();
         }
-        sendAccessEvent(R.string.lockscreen_access_pattern_start);
     }
 
     private void notifyPatternDetected() {
+        sendAccessEvent(R.string.lockscreen_access_pattern_detected);
         if (mOnPatternListener != null) {
             mOnPatternListener.onPatternDetected(mPattern);
         }
-        sendAccessEvent(R.string.lockscreen_access_pattern_detected);
     }
 
     private void notifyPatternCleared() {
+        sendAccessEvent(R.string.lockscreen_access_pattern_cleared);
         if (mOnPatternListener != null) {
             mOnPatternListener.onPatternCleared();
         }
-        sendAccessEvent(R.string.lockscreen_access_pattern_cleared);
     }
 
     /**
@@ -799,9 +799,7 @@ private void handleActionMove(MotionEvent event) {
     }
 
     private void sendAccessEvent(int resId) {
-        setContentDescription(mContext.getString(resId));
-        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
-        setContentDescription(null);
+        announceForAccessibility(mContext.getString(resId));
     }
 
     private void handleActionUp(MotionEvent event) {