Extends SeekBarPreference to add labels and callbacks

Adds title, left and right labels to the SeekBarPreference. Also adds
a listener for the seek stop event.

Bug: 146004827
Test: make RunSettingsRoboTests ROBOTEST_FILTER=GestureNavigationSeekBarPreferenceTest

Change-Id: I0ecca4e92cfc52abb8bb975b710f72f75ed5b50d

tests/robotests/src/com/android/settings/gestures/GestureNavigationSeekBarPreferenceTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2019 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.gestures;
+
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.SeekBar;
+
+import androidx.preference.Preference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class GestureNavigationSeekBarPreferenceTest {
+
+    private Context mContext;
+    private SeekBar mSeekBar;
+    private GestureNavigationSeekBarPreference mSeekBarPreference;
+
+    @Mock
+    private Preference.OnPreferenceChangeListener mListener;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        mContext = RuntimeEnvironment.application;
+        mSeekBarPreference = new GestureNavigationSeekBarPreference(mContext, null);
+        LayoutInflater inflater = LayoutInflater.from(mContext);
+        final View view =
+                inflater.inflate(mSeekBarPreference.getLayoutResource(),
+                        new LinearLayout(mContext), false);
+        mSeekBar = view.findViewById(com.android.internal.R.id.seekbar);
+    }
+
+    @Test
+    public void seekBarPreferenceOnStopTrackingTouch_callsListener() {
+        mSeekBar.setProgress(2);
+
+        mSeekBarPreference.setOnPreferenceChangeStopListener(mListener);
+        mSeekBarPreference.onStopTrackingTouch(mSeekBar);
+
+        verify(mListener, times(1)).onPreferenceChange(mSeekBarPreference, 2);
+    }
+}