Use framework support to customize dividers between prefs.

Bug: 33579296
Test: make RunSettingsRoboTests
Change-Id: I1bb3b82b88dc727cda05b00058e6f40564f0e5db
diff --git a/res/values/styles_preference.xml b/res/values/styles_preference.xml
index a78d87b..e7c2852 100644
--- a/res/values/styles_preference.xml
+++ b/res/values/styles_preference.xml
@@ -21,35 +21,44 @@
 
     <dimen name="preference_no_icon_padding_start">72dp</dimen>
 
-    <style name="ApnPreference">
+    <!-- Fragment style -->
+    <style name="PreferenceFragmentStyle" parent="@*android:style/PreferenceFragment.Material">
+        <item name="android:layout">@layout/preference_list_fragment</item>
+        <item name="allowDividerAfterLastItem">false</item>
+    </style>
+
+    <!-- Preferences -->
+    <style name="SettingsPreference">
+        <item name="allowDividerAbove">false</item>
+        <item name="allowDividerBelow">true</item>
+        <item name="android:layout">@layout/preference_material_settings</item>
+    </style>
+
+    <style name="ApnPreference" parent="SettingsPreference">
         <item name="android:layout">@layout/apn_preference_layout</item>
     </style>
 
     <style name="EditTextPreference"
            parent="@style/Preference.DialogPreference.EditTextPreference.Material">
+        <item name="allowDividerAbove">false</item>
+        <item name="allowDividerBelow">true</item>
         <item name="android:layout">@layout/preference_material_settings</item>
         <item name="android:dialogLayout">@layout/preference_dialog_edittext</item>
     </style>
 
-    <style name="PreferenceFragmentStyle" parent="@*android:style/PreferenceFragment.Material">
-        <item name="android:layout">@layout/preference_list_fragment</item>
-    </style>
-
-    <style name="SettingsPreference">
-        <item name="android:layout">@layout/preference_material_settings</item>
-    </style>
-
-    <style name="SettingsDropdownPreference">
+    <style name="SettingsDropdownPreference" parent="SettingsPreference">
         <item name="android:layout">@layout/preference_dropdown_material_settings</item>
     </style>
 
-    <style name="SettingsDialogPreference" parent="SettingsPreference"/>
+    <style name="SettingsDialogPreference" parent="SettingsPreference" />
 
     <style name="SettingsPreferenceCategory" parent="@style/Preference.Category.Material">
+        <item name="allowDividerAbove">true</item>
+        <item name="allowDividerBelow">true</item>
         <item name="android:layout">@layout/preference_category_material_settings</item>
     </style>
 
-    <style name="SettingsSeekBarPreference">
+    <style name="SettingsSeekBarPreference" parent="SettingsPreference">
         <item name="android:layout">@layout/preference_widget_seekbar_settings</item>
     </style>
 
diff --git a/src/com/android/settings/core/InstrumentedPreferenceFragment.java b/src/com/android/settings/core/InstrumentedPreferenceFragment.java
index 91ef3f1..746c10d 100644
--- a/src/com/android/settings/core/InstrumentedPreferenceFragment.java
+++ b/src/com/android/settings/core/InstrumentedPreferenceFragment.java
@@ -17,13 +17,7 @@
 package com.android.settings.core;
 
 import android.content.Context;
-import android.graphics.Color;
-import android.graphics.drawable.ColorDrawable;
-import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
 
 import com.android.settings.core.instrumentation.Instrumentable;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
@@ -31,7 +25,6 @@
 import com.android.settings.core.lifecycle.ObservablePreferenceFragment;
 import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.survey.SurveyMixin;
-import com.android.settings.widget.PreferenceDividerDecoration;
 
 /**
  * Instrumented fragment that logs visibility state.
@@ -44,9 +37,6 @@
     // metrics placeholder value. Only use this for development.
     protected final int PLACEHOLDER_METRIC = 10000;
 
-    private final PreferenceDividerDecoration mDividerDecoration =
-            new PreferenceDividerDecoration();
-
     private final VisibilityLoggerMixin mVisibilityLoggerMixin;
 
     public InstrumentedPreferenceFragment() {
@@ -63,14 +53,6 @@
     }
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container,
-            Bundle savedInstanceState) {
-        final View view = super.onCreateView(inflater, container, savedInstanceState);
-        getListView().addItemDecoration(mDividerDecoration);
-        return view;
-    }
-
-    @Override
     public void onResume() {
         mVisibilityLoggerMixin.setSourceMetricsCategory(getActivity());
         super.onResume();
@@ -80,12 +62,6 @@
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
     }
 
-    @Override
-    public void setDivider(Drawable divider) {
-        mDividerDecoration.setDivider(divider);
-        super.setDivider(new ColorDrawable(Color.TRANSPARENT));
-    }
-
     protected final Context getPrefContext() {
         return getPreferenceManager().getContext();
     }
diff --git a/src/com/android/settings/notification/VolumeSeekBarPreference.java b/src/com/android/settings/notification/VolumeSeekBarPreference.java
index 5ab1d29..8a51961 100644
--- a/src/com/android/settings/notification/VolumeSeekBarPreference.java
+++ b/src/com/android/settings/notification/VolumeSeekBarPreference.java
@@ -59,15 +59,18 @@
     }
 
     public VolumeSeekBarPreference(Context context, AttributeSet attrs, int defStyleAttr) {
-        this(context, attrs, defStyleAttr, 0);
+        super(context, attrs, defStyleAttr);
+        setLayoutResource(R.layout.preference_volume_slider);
     }
 
     public VolumeSeekBarPreference(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
+        super(context, attrs);
+        setLayoutResource(R.layout.preference_volume_slider);
     }
 
     public VolumeSeekBarPreference(Context context) {
-        this(context, null);
+        super(context);
+        setLayoutResource(R.layout.preference_volume_slider);
     }
 
     public void setStream(int stream) {
diff --git a/src/com/android/settings/widget/PreferenceDividerDecoration.java b/src/com/android/settings/widget/PreferenceDividerDecoration.java
deleted file mode 100644
index 4466a3d..0000000
--- a/src/com/android/settings/widget/PreferenceDividerDecoration.java
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * Copyright (C) 2016 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.widget;
-
-import android.graphics.Canvas;
-import android.graphics.drawable.Drawable;
-import android.support.v4.view.ViewCompat;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceCategory;
-import android.support.v7.preference.PreferenceGroupAdapter;
-import android.support.v7.widget.RecyclerView;
-import android.view.View;
-
-public class PreferenceDividerDecoration extends RecyclerView.ItemDecoration {
-
-    private Drawable mDivider;
-    private int mDividerHeight;
-
-    public void setDivider(Drawable divider) {
-        if (divider != null) {
-            mDividerHeight = divider.getIntrinsicHeight();
-        } else {
-            mDividerHeight = 0;
-        }
-        mDivider = divider;
-    }
-
-    public void setDividerHeight(int dividerHeight) {
-        mDividerHeight = dividerHeight;
-    }
-
-    @Override
-    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
-        if (mDivider == null) {
-            return;
-        }
-        final int childCount = parent.getChildCount();
-        final int width = parent.getWidth();
-        for (int childViewIndex = 0; childViewIndex < childCount; childViewIndex++) {
-            final View view = parent.getChildAt(childViewIndex);
-            if (shouldDrawDividerAbove(view, parent)) {
-                int top = (int) ViewCompat.getY(view);
-                mDivider.setBounds(0, top, width, top + mDividerHeight);
-                mDivider.draw(c);
-            }
-        }
-    }
-
-    private boolean shouldDrawDividerAbove(View view, RecyclerView parent) {
-        final RecyclerView.Adapter adapter = parent.getAdapter();
-        if (adapter == null || !(adapter instanceof PreferenceGroupAdapter)) {
-            return false;
-        }
-        final PreferenceGroupAdapter prefAdapter = (PreferenceGroupAdapter) adapter;
-        final int adapterPosition = parent.getChildAdapterPosition(view);
-        if (adapterPosition == RecyclerView.NO_POSITION) {
-            return false;
-        }
-        final Preference pref = prefAdapter.getItem(adapterPosition);
-        if (pref instanceof PreferenceCategory) {
-            return adapterPosition != 0;
-        }
-        return pref instanceof FooterPreference;
-    }
-}
diff --git a/tests/robotests/src/com/android/settings/DeviceInfoSettingsTest.java b/tests/robotests/src/com/android/settings/DeviceInfoSettingsTest.java
index 17ca85c..ea889a5 100644
--- a/tests/robotests/src/com/android/settings/DeviceInfoSettingsTest.java
+++ b/tests/robotests/src/com/android/settings/DeviceInfoSettingsTest.java
@@ -19,10 +19,6 @@
 import android.content.Context;
 import android.os.UserManager;
 import android.support.v7.preference.PreferenceScreen;
-import android.test.AndroidTestCase;
-
-import com.android.settings.testutils.FakeFeatureFactory;
-import com.android.settingslib.DeviceInfoUtils;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -33,14 +29,13 @@
 import org.robolectric.annotation.Config;
 
 import static com.google.common.truth.Truth.assertThat;
-import static com.google.common.truth.Truth.assertWithMessage;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
 
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
-public class DeviceInfoSettingsTest extends AndroidTestCase {
+public class DeviceInfoSettingsTest {
 
     @Mock(answer = Answers.RETURNS_DEEP_STUBS)
     private Context mContext;
@@ -49,21 +44,18 @@
     @Mock
     private UserManager mUserManager;
 
-    private FakeFeatureFactory mFeatureFactory;
     private DeviceInfoSettings mSettings;
 
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
-        FakeFeatureFactory.setupForTest(mContext);
-        mFeatureFactory = (FakeFeatureFactory) FakeFeatureFactory.getFactory(mContext);
         when(mContext.getSystemService(Context.USER_SERVICE)).thenReturn(mUserManager);
         mSettings = spy(new DeviceInfoSettings());
         doReturn(mScreen).when(mSettings).getPreferenceScreen();
     }
 
     @Test
-    public void getPrefXml_shoudlReturnDeviceInfoXml() {
+    public void getPrefXml_shouldReturnDeviceInfoXml() {
         assertThat(mSettings.getPreferenceScreenResId()).isEqualTo(R.xml.device_info_settings);
     }
 }
diff --git a/tests/robotests/src/com/android/settings/widget/PreferenceDividerDecorationTest.java b/tests/robotests/src/com/android/settings/widget/PreferenceDividerDecorationTest.java
deleted file mode 100644
index f69de54..0000000
--- a/tests/robotests/src/com/android/settings/widget/PreferenceDividerDecorationTest.java
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * Copyright (C) 2016 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.widget;
-
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.drawable.Drawable;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceCategory;
-import android.support.v7.preference.PreferenceGroupAdapter;
-import android.support.v7.widget.RecyclerView;
-import android.view.View;
-
-import com.android.settings.SettingsRobolectricTestRunner;
-import com.android.settings.TestConfig;
-
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Answers;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-import org.robolectric.annotation.Config;
-
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyInt;
-import static org.mockito.Mockito.never;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-@RunWith(SettingsRobolectricTestRunner.class)
-@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
-public class PreferenceDividerDecorationTest {
-
-    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
-    private Context mContext;
-    @Mock
-    private Drawable mDrawable;
-    @Mock
-    private Canvas mCanvas;
-    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
-    private RecyclerView mRecyclerView;
-    @Mock
-    private PreferenceGroupAdapter mAdapter;
-    @Mock
-    private PreferenceCategory mPrefCategory;
-    @Mock
-    private Preference mNormalPref;
-    @Mock
-    private FooterPreference mFooterPref;
-    private PreferenceDividerDecoration mDecoration;
-
-    @Before
-    public void setUp() {
-        MockitoAnnotations.initMocks(this);
-        mDecoration = new PreferenceDividerDecoration();
-        mDecoration.setDivider(mDrawable);
-        mDecoration.setDividerHeight(3);
-    }
-
-    @Test
-    public void drawOver_footerPreference_shouldDrawDivider() {
-        when(mRecyclerView.getAdapter()).thenReturn(mAdapter);
-        when(mRecyclerView.getChildCount()).thenReturn(1);
-        when(mAdapter.getItem(anyInt())).thenReturn(mFooterPref);
-
-        mDecoration.onDrawOver(mCanvas, mRecyclerView, null /* state */);
-
-        verify(mDrawable).draw(mCanvas);
-    }
-
-    @Test
-    public void drawOver_preferenceCategory_shouldSkipFirst() {
-        when(mRecyclerView.getAdapter()).thenReturn(mAdapter);
-        when(mRecyclerView.getChildCount()).thenReturn(3);
-        when(mAdapter.getItem(anyInt())).thenReturn(mPrefCategory);
-        when(mRecyclerView.getChildAdapterPosition(any(View.class)))
-                .thenReturn(0)
-                .thenReturn(1)
-                .thenReturn(2);
-
-        mDecoration.onDrawOver(mCanvas, mRecyclerView, null /* state */);
-
-        // 3 prefCategory, should skip first draw
-        verify(mDrawable, times(2)).draw(mCanvas);
-    }
-
-    @Test
-    public void drawOver_preference_doNotDrawDivider() {
-        when(mRecyclerView.getAdapter()).thenReturn(mAdapter);
-        when(mRecyclerView.getChildCount()).thenReturn(1);
-        when(mAdapter.getItem(anyInt())).thenReturn(mNormalPref);
-
-        mDecoration.onDrawOver(mCanvas, mRecyclerView, null /* state */);
-
-        verify(mDrawable, never()).draw(mCanvas);
-    }
-}