Fine-tune the widget of "Allow rich content in Accessibility Settings" for security.

1. Remove tag checker in HtmlTextPreference.
2. Set the max height for AnimatedImagePreference.

Bug: 149516547
Test: manaul test
Change-Id: I98f49d055db9427d91a3f1ca816e94a11d29cd3d
Merged-In: I98f49d055db9427d91a3f1ca816e94a11d29cd3d
(cherry picked from commit 10bc375176)

src/com/android/settings/accessibility/AnimatedImagePreference.java

@@ -34,6 +34,7 @@ import com.android.settings.R;
 public class AnimatedImagePreference extends Preference {
 
     private Uri mImageUri;
+    private int mMaxHeight = -1;
 
     AnimatedImagePreference(Context context) {
         super(context);
@@ -45,20 +46,26 @@ public class AnimatedImagePreference extends Preference {
         super.onBindViewHolder(holder);
 
         final ImageView imageView = holder.itemView.findViewById(R.id.animated_img);
-        if (imageView != null && mImageUri != null) {
+        if (imageView == null) {
+            return;
+        }
+
+        if (mImageUri != null) {
             imageView.setImageURI(mImageUri);
 
             final Drawable drawable = imageView.getDrawable();
-            if (drawable != null) {
-                if (drawable instanceof AnimatedImageDrawable) {
-                    ((AnimatedImageDrawable) drawable).start();
-                }
+            if (drawable instanceof AnimatedImageDrawable) {
+                ((AnimatedImageDrawable) drawable).start();
             }
         }
+
+        if (mMaxHeight > -1) {
+            imageView.setMaxWidth(mMaxHeight);
+        }
     }
 
     /**
-     * Set image uri to display image in {@link ImageView}
+     * Sets image uri to display image in {@link ImageView}
      *
      * @param imageUri the Uri of an image
      */
@@ -68,4 +75,16 @@ public class AnimatedImagePreference extends Preference {
             notifyChanged();
         }
     }
+
+    /**
+     * Sets the maximum height of the view.
+     *
+     * @param maxHeight the maximum height of ImageView in terms of pixels.
+     */
+    public void setMaxHeight(int maxHeight) {
+        if (maxHeight != mMaxHeight) {
+            mMaxHeight = maxHeight;
+            notifyChanged();
+        }
+    }
 }