2 files changed, 88 insertions, 9 deletions

diff --git a/core/java/android/view/DisplayAdjustments.java b/core/java/android/view/DisplayAdjustments.java
index 834dd7b6e7d8..27c2d5c5cdc3 100644
--- a/core/java/android/view/DisplayAdjustments.java
+++ b/core/java/android/view/DisplayAdjustments.java
@@ -16,6 +16,8 @@
 
 package android.view;
 
+import android.annotation.NonNull;
+import android.annotation.Nullable;
 import android.compat.annotation.UnsupportedAppUsage;
 import android.content.res.CompatibilityInfo;
 import android.content.res.Configuration;
@@ -27,25 +29,25 @@ public class DisplayAdjustments {
     public static final DisplayAdjustments DEFAULT_DISPLAY_ADJUSTMENTS = new DisplayAdjustments();
 
     private volatile CompatibilityInfo mCompatInfo = CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
-    private Configuration mConfiguration;
+    private final Configuration mConfiguration = new Configuration(Configuration.EMPTY);
 
     @UnsupportedAppUsage
     public DisplayAdjustments() {
     }
 
-    public DisplayAdjustments(Configuration configuration) {
-        mConfiguration = new Configuration(configuration != null
-                ? configuration : Configuration.EMPTY);
+    public DisplayAdjustments(@Nullable Configuration configuration) {
+        if (configuration != null) {
+            mConfiguration.setTo(configuration);
+        }
     }
 
-    public DisplayAdjustments(DisplayAdjustments daj) {
+    public DisplayAdjustments(@NonNull DisplayAdjustments daj) {
         setCompatibilityInfo(daj.mCompatInfo);
-        mConfiguration = new Configuration(daj.mConfiguration != null
-                ? daj.mConfiguration : Configuration.EMPTY);
+        mConfiguration.setTo(daj.getConfiguration());
     }
 
     @UnsupportedAppUsage
-    public void setCompatibilityInfo(CompatibilityInfo compatInfo) {
+    public void setCompatibilityInfo(@Nullable CompatibilityInfo compatInfo) {
         if (this == DEFAULT_DISPLAY_ADJUSTMENTS) {
             throw new IllegalArgumentException(
                     "setCompatbilityInfo: Cannot modify DEFAULT_DISPLAY_ADJUSTMENTS");
@@ -62,7 +64,13 @@ public class DisplayAdjustments {
         return mCompatInfo;
     }
 
-    public void setConfiguration(Configuration configuration) {
+    /**
+     * Updates the configuration for the DisplayAdjustments with new configuration.
+     * Default to EMPTY configuration if new configuration is {@code null}
+     * @param configuration new configuration
+     * @throws IllegalArgumentException if trying to modify DEFAULT_DISPLAY_ADJUSTMENTS
+     */
+    public void setConfiguration(@Nullable Configuration configuration) {
         if (this == DEFAULT_DISPLAY_ADJUSTMENTS) {
             throw new IllegalArgumentException(
                     "setConfiguration: Cannot modify DEFAULT_DISPLAY_ADJUSTMENTS");
@@ -71,6 +79,7 @@ public class DisplayAdjustments {
     }
 
     @UnsupportedAppUsage
+    @NonNull
     public Configuration getConfiguration() {
         return mConfiguration;
     }
diff --git a/core/tests/coretests/src/android/view/DisplayAdjustmentsTests.java b/core/tests/coretests/src/android/view/DisplayAdjustmentsTests.java
new file mode 100644
index 000000000000..afbf8db3cd2d
--- /dev/null
+++ b/core/tests/coretests/src/android/view/DisplayAdjustmentsTests.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2020 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 android.view;
+
+import static org.junit.Assert.assertEquals;
+
+import android.content.res.Configuration;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests for {@link DisplayAdjustmentsTests}.
+ *
+ * <p>Build/Install/Run:
+ *  atest FrameworksCoreTests:DisplayAdjustmentsTests
+ */
+@RunWith(AndroidJUnit4.class)
+public class DisplayAdjustmentsTests {
+
+    @Test
+    public void testDefaultConstructor_hasEmptyConfiguration() {
+        DisplayAdjustments emptyAdjustments = new DisplayAdjustments();
+
+        assertEquals(Configuration.EMPTY, emptyAdjustments.getConfiguration());
+    }
+
+    @Test
+    public void testConfigurationConstructor_nullConfigurationBecomesEmpty() {
+        DisplayAdjustments emptyAdjustments = new DisplayAdjustments((Configuration) null);
+
+        assertEquals(Configuration.EMPTY, emptyAdjustments.getConfiguration());
+    }
+
+    @Test
+    public void testConfigurationConstructor_copiesConfiguration() {
+        Configuration configuration = new Configuration();
+        configuration.colorMode = 1000;
+        DisplayAdjustments adjustments = new DisplayAdjustments(configuration);
+
+        assertEquals(configuration, adjustments.getConfiguration());
+    }
+
+    @Test
+    public void testDisplayAdjustmentsConstructor_copiesConfiguration() {
+        Configuration configuration = new Configuration();
+        configuration.colorMode = 1000;
+        DisplayAdjustments oldAdjustments = new DisplayAdjustments(configuration);
+
+        DisplayAdjustments newAdjustments = new DisplayAdjustments(oldAdjustments);
+
+        assertEquals(configuration, newAdjustments.getConfiguration());
+    }
+}