Settings: Hide radio info if device don't support voice

Change-Id: I481485b2563fdb27b35b31fa95795db94a863f2f
Signed-off-by: LynnrinChan <lynnrin@lynnrin.moe>

res/xml/my_device_info.xml

@@ -96,7 +96,8 @@
         <Preference
             android:title="@string/radio_info_title"
             android:key="radio_info_settings"
-            android:order="6">
+            android:order="6"
+            settings:controller="com.android.settings.deviceinfo.RadioInfoPreferenceController">
             <intent android:action="android.intent.action.MAIN"
                     android:targetPackage="com.android.phone"
                     android:targetClass="com.android.phone.settings.RadioInfo" />

src/com/android/settings/deviceinfo/RadioInfoPreferenceController.java

@@ -0,0 +1,47 @@
+/*
+ * 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.deviceinfo;
+
+import android.content.Context;
+import android.telephony.TelephonyManager;
+
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+public class RadioInfoPreferenceController extends BasePreferenceController {
+
+    private TelephonyManager mTelephonyManager;
+
+    public RadioInfoPreferenceController(Context context, String key) {
+        super(context, key);
+        mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mTelephonyManager.isVoiceCapable()
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+}