diff --git a/core/java/android/view/accessibility/AccessibilityEvent.java b/core/java/android/view/accessibility/AccessibilityEvent.java
index 3b8368380ddad..d80d2300dbce4 100644
--- a/core/java/android/view/accessibility/AccessibilityEvent.java
+++ b/core/java/android/view/accessibility/AccessibilityEvent.java
@@ -605,7 +605,10 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
     /**
      * Change type for {@link #TYPE_WINDOW_CONTENT_CHANGED} event:
      * state description of the node as returned by
-     * {@link AccessibilityNodeInfo#getStateDescription} changed.
+     * {@link AccessibilityNodeInfo#getStateDescription} changed. If part of the state description
+     * changes, the changed part can be put into event text. For example, if state description
+     * changed from "on, wifi signal full" to "on, wifi three bars", "wifi three bars" can be put
+     * into the event text.
      */
     public static final int CONTENT_CHANGE_TYPE_STATE_DESCRIPTION = 0x00000040;
 
diff --git a/packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSTileBaseView.java b/packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSTileBaseView.java
index 8feee10c7e834..314b4425efb57 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSTileBaseView.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/tileimpl/QSTileBaseView.java
@@ -13,6 +13,8 @@
  */
 package com.android.systemui.qs.tileimpl;
 
+import static android.view.accessibility.AccessibilityEvent.CONTENT_CHANGE_TYPE_STATE_DESCRIPTION;
+
 import static com.android.systemui.qs.tileimpl.QSIconViewImpl.QS_ANIM_LENGTH;
 
 import android.animation.ValueAnimator;
@@ -73,6 +75,10 @@ public class QSTileBaseView extends com.android.systemui.plugins.qs.QSTileView {
     private int mCircleColor;
     private int mBgSize;
 
+    private static final int INVALID = -1;
+    private CharSequence mStateDescriptionDeltas = null;
+    private CharSequence mLastStateDescription;
+    private int mLastState = INVALID;
 
     public QSTileBaseView(Context context, QSIconView icon) {
         this(context, icon, false);
@@ -250,8 +256,14 @@ public class QSTileBaseView extends com.android.systemui.plugins.qs.QSTileView {
         if (!TextUtils.isEmpty(state.stateDescription)) {
             stateDescription.append(", ");
             stateDescription.append(state.stateDescription);
+            if (mLastState != INVALID && state.state == mLastState
+                    && !state.stateDescription.equals(mLastStateDescription)) {
+                mStateDescriptionDeltas = state.stateDescription;
+            }
         }
         setStateDescription(stateDescription.toString());
+        mLastState = state.state;
+        mLastStateDescription = state.stateDescription;
 
         mAccessibilityClass =
                 state.state == Tile.STATE_UNAVAILABLE ? null : state.expandedAccessibilityClassName;
@@ -314,6 +326,11 @@ public class QSTileBaseView extends com.android.systemui.plugins.qs.QSTileView {
         if (!TextUtils.isEmpty(mAccessibilityClass)) {
             event.setClassName(mAccessibilityClass);
         }
+        if (event.getContentChangeTypes() == CONTENT_CHANGE_TYPE_STATE_DESCRIPTION
+                && mStateDescriptionDeltas != null) {
+            event.getText().add(mStateDescriptionDeltas);
+            mStateDescriptionDeltas = null;
+        }
     }
 
     @Override
diff --git a/packages/SystemUI/src/com/android/systemui/qs/tiles/BluetoothTile.java b/packages/SystemUI/src/com/android/systemui/qs/tiles/BluetoothTile.java
index 361b6c1b12600..cf82ed194241b 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/tiles/BluetoothTile.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/tiles/BluetoothTile.java
@@ -134,7 +134,8 @@ public class BluetoothTile extends QSTileImpl<BooleanState> {
         state.label = mContext.getString(R.string.quick_settings_bluetooth_label);
         state.secondaryLabel = TextUtils.emptyIfNull(
                 getSecondaryLabel(enabled, connecting, connected, state.isTransient));
-        state.contentDescription = state.label;
+        state.contentDescription = mContext.getString(
+                R.string.accessibility_quick_settings_bluetooth);
         state.stateDescription = "";
         if (enabled) {
             if (connected) {
@@ -152,15 +153,11 @@ public class BluetoothTile extends QSTileImpl<BooleanState> {
             } else {
                 state.icon =
                         ResourceIcon.get(com.android.internal.R.drawable.ic_qs_bluetooth);
-                state.contentDescription = mContext.getString(
-                        R.string.accessibility_quick_settings_bluetooth);
                 state.stateDescription = mContext.getString(R.string.accessibility_not_connected);
             }
             state.state = Tile.STATE_ACTIVE;
         } else {
             state.icon = ResourceIcon.get(com.android.internal.R.drawable.ic_qs_bluetooth);
-            state.contentDescription = mContext.getString(
-                    R.string.accessibility_quick_settings_bluetooth);
             state.state = Tile.STATE_INACTIVE;
         }