Fix broken tests on Accessibility package

The VectorDrawableState would be new memory location to cause the
VectorDrawableState are different.

Bug: 187240532
Test: make RunSettingsRoboTests -j52 ROBOTEST_FILTER=AccessibilityButtonPreviewPreferenceControllerTest
Test: make RunSettingsRoboTests -j52 ROBOTEST_FILTER=FloatingMenuLayerDrawableTest
Change-Id: I33bc9076ee288beb044af29e9974f5f6328f29b8

tests/robotests/src/com/android/settings/accessibility/AccessibilityButtonPreviewPreferenceControllerTest.java

@@ -33,6 +33,7 @@ import android.widget.ImageView;
 import androidx.test.core.app.ApplicationProvider;
 
 import com.android.settings.R;
+import com.android.settings.testutils.ImageTestUtils;
 
 import org.junit.Before;
 import org.junit.Rule;
@@ -73,8 +74,8 @@ public class AccessibilityButtonPreviewPreferenceControllerTest {
 
         final Drawable navigationBarDrawable = mContext.getDrawable(
                 R.drawable.accessibility_button_navigation);
-        assertThat(mController.mPreview.getDrawable().getConstantState()).isEqualTo(
-                navigationBarDrawable.getConstantState());
+        assertThat(ImageTestUtils.drawableToBitmap(mController.mPreview.getDrawable()).sameAs(
+                ImageTestUtils.drawableToBitmap(navigationBarDrawable))).isTrue();
     }
 
     @Test

tests/robotests/src/com/android/settings/accessibility/FloatingMenuLayerDrawableTest.java

@@ -24,6 +24,7 @@ import android.graphics.drawable.Drawable;
 import androidx.test.core.app.ApplicationProvider;
 
 import com.android.settings.R;
+import com.android.settings.testutils.ImageTestUtils;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -51,11 +52,10 @@ public class FloatingMenuLayerDrawableTest {
 
         final Drawable actual1stDrawable = actualDrawable.getDrawable(0);
         final Drawable actual2ndDrawable = actualDrawable.getDrawable(1);
-        // These are VectorDrawables, so it can use getConstantState() to compare.
-        assertThat(actual1stDrawable.getConstantState()).isEqualTo(
-                expected1stDrawable.getConstantState());
-        assertThat(actual2ndDrawable.getConstantState()).isEqualTo(
-                expected2ndDrawable.getConstantState());
+        assertThat(ImageTestUtils.drawableToBitmap(actual1stDrawable).sameAs(
+                ImageTestUtils.drawableToBitmap(expected1stDrawable))).isTrue();
+        assertThat(ImageTestUtils.drawableToBitmap(actual2ndDrawable).sameAs(
+                ImageTestUtils.drawableToBitmap(expected2ndDrawable))).isTrue();
     }
 
     @Test

tests/robotests/src/com/android/settings/testutils/ImageTestUtils.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.testutils;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+
+import androidx.annotation.Nullable;
+
+/**
+ * Utilities for testing images within unit tests.
+ */
+public class ImageTestUtils {
+
+    /** Converts the drawable object to bitmap. */
+    @Nullable
+    public static Bitmap drawableToBitmap(@Nullable Drawable drawable) {
+        if (drawable == null) {
+            return null;
+        }
+
+        final Bitmap bitmap =
+                Bitmap.createBitmap(
+                        drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
+                        Bitmap.Config.ARGB_8888);
+        final Canvas canvas = new Canvas(bitmap);
+        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
+        drawable.draw(canvas);
+
+        return bitmap;
+    }
+}