Add SettingsSpinnerPreference

This preference uses SettingsSpinner & SettingsSpinnerAdapter
which provide default layouts for both view and drop down view
of the Spinner.

Bug: 177617478
Test: atest SettingsSpinnerPreferenceTest
Change-Id: I9ceb2db6d82692ee21b6d96af7b42c49400d5071
diff --git a/packages/SettingsLib/tests/integ/Android.bp b/packages/SettingsLib/tests/integ/Android.bp
index f6f9dba..92e32d9 100644
--- a/packages/SettingsLib/tests/integ/Android.bp
+++ b/packages/SettingsLib/tests/integ/Android.bp
@@ -38,6 +38,7 @@
         "androidx.test.espresso.core",
         "mockito-target-minus-junit4",
         "truth-prebuilt",
+        "SettingsLibSettingsSpinner",
         "SettingsLibUsageProgressBarPreference",
     ],
 
diff --git a/packages/SettingsLib/tests/integ/src/com/android/settingslib/widget/SettingsSpinnerPreferenceTest.java b/packages/SettingsLib/tests/integ/src/com/android/settingslib/widget/SettingsSpinnerPreferenceTest.java
new file mode 100644
index 0000000..53a382a
--- /dev/null
+++ b/packages/SettingsLib/tests/integ/src/com/android/settingslib/widget/SettingsSpinnerPreferenceTest.java
@@ -0,0 +1,92 @@
+/*
+ * 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.settingslib.widget;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.LinearLayout;
+
+import androidx.preference.PreferenceViewHolder;
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.runner.AndroidJUnit4;
+
+import com.android.settingslib.widget.settingsspinner.SettingsSpinner;
+import com.android.settingslib.widget.settingsspinner.SettingsSpinnerAdapter;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RunWith(AndroidJUnit4.class)
+public class SettingsSpinnerPreferenceTest {
+
+    private Context mContext;
+    private PreferenceViewHolder mViewHolder;
+    private SettingsSpinner mSpinner;
+    private SettingsSpinnerPreference mSpinnerPreference;
+
+    @Before
+    public void setUp() {
+        mContext = ApplicationProvider.getApplicationContext();
+        mSpinnerPreference = new SettingsSpinnerPreference(mContext);
+        final LayoutInflater inflater = LayoutInflater.from(mContext);
+        final View rootView = inflater.inflate(mSpinnerPreference.getLayoutResource(),
+                new LinearLayout(mContext), false /* attachToRoot */);
+        mViewHolder = PreferenceViewHolder.createInstanceForTests(rootView);
+        mSpinner = (SettingsSpinner) mViewHolder.findViewById(R.id.spinner);
+    }
+
+    @Test
+    public void onBindViewHolder_noSetSelection_getDefaultItem() {
+        final List<CharSequence> list = new ArrayList<>();
+        list.add("TEST1");
+        list.add("TEST2");
+        list.add("TEST3");
+        final SettingsSpinnerAdapter adapter = new SettingsSpinnerAdapter(mContext);
+        adapter.addAll(list);
+        mSpinnerPreference.setAdapter(adapter);
+
+        mSpinnerPreference.onBindViewHolder(mViewHolder);
+
+        assertThat(adapter).isEqualTo(mSpinner.getAdapter());
+        assertThat(mSpinnerPreference.getSelectedItem())
+                .isEqualTo(mSpinner.getAdapter().getItem(0));
+    }
+
+    @Test
+    public void onBindViewHolder_setSelection_getSelectedItem() {
+        final List<CharSequence> list = new ArrayList<>();
+        list.add("TEST1");
+        list.add("TEST2");
+        list.add("TEST3");
+        final SettingsSpinnerAdapter adapter = new SettingsSpinnerAdapter(mContext);
+        adapter.addAll(list);
+        mSpinnerPreference.setAdapter(adapter);
+        mSpinnerPreference.setSelection(1);
+
+        mSpinnerPreference.onBindViewHolder(mViewHolder);
+
+        assertThat(mSpinnerPreference.getSelectedItem())
+                .isEqualTo(mSpinner.getAdapter().getItem(1));
+    }
+}