Add PreferenceController for support tile in homepage.

Change-Id: I8fe93456a761382513c07ff85c858ded30f599fc
Fixes: 116875332
Test: robotests

src/com/android/settings/support/SupportPreferenceController.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 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.support;
+
+import android.app.Activity;
+import android.content.Context;
+import android.text.TextUtils;
+
+import androidx.preference.Preference;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.overlay.SupportFeatureProvider;
+
+public class SupportPreferenceController extends BasePreferenceController {
+
+    private final SupportFeatureProvider mSupportFeatureProvider;
+
+    private Activity mActivity;
+
+    public SupportPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mSupportFeatureProvider = FeatureFactory.getFactory(context)
+                .getSupportFeatureProvider(context);
+    }
+
+    public void setActivity(Activity activity) {
+        mActivity = activity;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mSupportFeatureProvider == null ? UNSUPPORTED_ON_DEVICE : AVAILABLE;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (preference == null || mActivity == null ||
+                !TextUtils.equals(preference.getKey(), getPreferenceKey())) {
+            return false;
+        }
+        mSupportFeatureProvider.startSupport(mActivity);
+        return true;
+
+    }
+}