Provides BackgroundPreference that can set background statically or dynamically

Bug: 320709814
Test: atest BackgroundPreferenceTest
Change-Id: I73e62733e6afd032ce980a4d6db0f4ca4573e770

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

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2024 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.accessibility;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import androidx.preference.PreferenceViewHolder;
+import androidx.test.core.app.ApplicationProvider;
+
+import com.android.settings.R;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Spy;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link BackgroundPreference} */
+@RunWith(RobolectricTestRunner.class)
+public class BackgroundPreferenceTest {
+
+    @Rule
+    public final MockitoRule mMockitoRule = MockitoJUnit.rule();
+
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+
+    private View mRootView = new View(mContext);
+    @Spy
+    private PreferenceViewHolder mViewHolder = PreferenceViewHolder.createInstanceForTests(
+            mRootView);
+    @Spy
+    private LinearLayout mLinearLayout = new LinearLayout(mContext);
+    private BackgroundPreference mPreference;
+
+    @Before
+    public void setUp() {
+        mPreference = new BackgroundPreference(mContext);
+    }
+
+    @Test
+    public void setBackground_success() {
+        doReturn(mLinearLayout).when(mViewHolder).findViewById(R.id.background);
+
+        mPreference.setBackground(android.R.drawable.screen_background_dark);
+        mPreference.onBindViewHolder(mViewHolder);
+
+        verify(mLinearLayout).setBackground(any());
+    }
+}