Only inject accessibility when speaking service enabled.

Bug: 6922883
Change-Id: I48d03a2da9bcf7375156c84219802bf20af4ddc6

Author: alanv

core/java/android/webkit/WebViewClassic.java

@@ -16,6 +16,7 @@
 
 package android.webkit;
 
+import android.accessibilityservice.AccessibilityServiceInfo;
 import android.animation.ObjectAnimator;
 import android.annotation.Widget;
 import android.app.ActivityManager;
@@ -1743,8 +1744,21 @@ public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
         event.setMaxScrollY(Math.max(convertedContentHeight - adjustedViewHeight, 0));
     }
 
-    private boolean isAccessibilityEnabled() {
-        return AccessibilityManager.getInstance(mContext).isEnabled();
+    private boolean isAccessibilityInjectionEnabled() {
+        final AccessibilityManager manager = AccessibilityManager.getInstance(mContext);
+        if (!manager.isEnabled()) {
+            return false;
+        }
+
+        // Accessibility scripts should be injected only when a speaking service
+        // is enabled. This may need to change later to accommodate Braille.
+        final List<AccessibilityServiceInfo> services = manager.getEnabledAccessibilityServiceList(
+                AccessibilityServiceInfo.FEEDBACK_SPOKEN);
+        if (services.isEmpty()) {
+            return false;
+        }
+
+        return true;
     }
 
     private AccessibilityInjector getAccessibilityInjector() {
@@ -3930,7 +3944,7 @@ private boolean setContentScrollBy(int cx, int cy, boolean animate) {
 
         // reset the flag since we set to true in if need after
         // loading is see onPageFinished(Url)
-        if (isAccessibilityEnabled()) {
+        if (isAccessibilityInjectionEnabled()) {
             getAccessibilityInjector().onPageStarted(url);
         }
 
@@ -3945,7 +3959,7 @@ private boolean setContentScrollBy(int cx, int cy, boolean animate) {
     /* package */ void onPageFinished(String url) {
         mZoomManager.onPageFinished(url);
 
-        if (isAccessibilityEnabled()) {
+        if (isAccessibilityInjectionEnabled()) {
             getAccessibilityInjector().onPageFinished(url);
         }
     }
@@ -4986,7 +5000,7 @@ public boolean onKeyDown(int keyCode, KeyEvent event) {
         }
 
         // See if the accessibility injector needs to handle this event.
-        if (isAccessibilityEnabled()
+        if (isAccessibilityInjectionEnabled()
                 && getAccessibilityInjector().handleKeyEventIfNecessary(event)) {
             return true;
         }
@@ -5093,7 +5107,7 @@ public boolean onKeyUp(int keyCode, KeyEvent event) {
         }
 
         // See if the accessibility injector needs to handle this event.
-        if (isAccessibilityEnabled()
+        if (isAccessibilityInjectionEnabled()
                 && getAccessibilityInjector().handleKeyEventIfNecessary(event)) {
             return true;
         }
@@ -5344,7 +5358,7 @@ String getSelection() {
     public void onAttachedToWindow() {
         if (mWebView.hasWindowFocus()) setActive(true);
 
-        if (isAccessibilityEnabled()) {
+        if (isAccessibilityInjectionEnabled()) {
             getAccessibilityInjector().addAccessibilityApisIfNecessary();
         }
 
@@ -5357,7 +5371,7 @@ public void onDetachedFromWindow() {
         mZoomManager.dismissZoomPicker();
         if (mWebView.hasWindowFocus()) setActive(false);
 
-        if (isAccessibilityEnabled()) {
+        if (isAccessibilityInjectionEnabled()) {
             getAccessibilityInjector().removeAccessibilityApisIfNecessary();
         } else {
             // Ensure the injector is cleared if we're detaching from the window
@@ -7439,7 +7453,7 @@ public void handleMessage(Message msg) {
                     break;
 
                 case SELECTION_STRING_CHANGED:
-                    if (isAccessibilityEnabled()) {
+                    if (isAccessibilityInjectionEnabled()) {
                         getAccessibilityInjector()
                                 .handleSelectionChangedIfNecessary((String) msg.obj);
                     }