[Settings] replace isNonTtyOrTtyOnVolteEnabled() and isVtEnabledByUser() in VT

1. Code refactor
2. Replace ImsManager#isNonTtyOrTtyOnVolteEnabled() by combination of
   TelecomManager#getCurrentTtyMode() and
   ImsMmTelManager#isTtyOverVolteEnabled()
3. Replace ImsManager#isVtEnabledByUser() by
ImsMmTelManager#isVtSettingEnabled()

Bug: 140542283
Test: m RunSettingsRoboTests -j
ROBOTEST_FILTER=VideoCallingPreferenceControllerTest

Change-Id: I731c086cfea4330424b042bbf473b3cf77696a8c

src/com/android/settings/network/ims/ImsQueryVtUserSetting.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2020 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.network.ims;
+
+import android.telephony.ims.ImsMmTelManager;
+
+
+/**
+ * An {@code ImsQuery} for accessing IMS VT enabled settings from user
+ */
+public class ImsQueryVtUserSetting extends ImsDirectQueryImpl {
+
+    /**
+     * Constructor
+     * @param subId subscription id
+     */
+    public ImsQueryVtUserSetting(int subId) {
+        mSubId = subId;
+    }
+
+    private volatile int mSubId;
+
+    /**
+     * Query running within a {@code Callable}
+     *
+     * @return result of query
+     */
+    public Boolean call() {
+        final ImsMmTelManager imsMmTelManager = ImsMmTelManager.createForSubscriptionId(mSubId);
+        return imsMmTelManager.isVtSettingEnabled();
+    }
+}

src/com/android/settings/network/ims/VtQueryImsState.java

@@ -19,13 +19,12 @@ package com.android.settings.network.ims;
 import android.content.Context;
 import android.telephony.SubscriptionManager;
 
-import com.android.ims.ImsManager;
-import com.android.settings.network.SubscriptionUtil;
+import androidx.annotation.VisibleForTesting;
 
 /**
  * Controller class for querying VT status
  */
-public class VtQueryImsState {
+public class VtQueryImsState extends ImsQueryController {
 
     private Context mContext;
     private int mSubId;
@@ -41,6 +40,27 @@ public class VtQueryImsState {
         mSubId = subId;
     }
 
+    /**
+     * Implementation of ImsQueryController#isEnabledByUser(int subId)
+     */
+    @VisibleForTesting
+    ImsDirectQuery isEnabledByUser(int subId) {
+        return new ImsQueryVtUserSetting(subId);
+    }
+
+    /**
+     * Get allowance status for user to alter configuration
+     *
+     * @return true when changing configuration by user is allowed.
+     */
+    public boolean isAllowUserControl() {
+        if (!SubscriptionManager.isValidSubscriptionId(mSubId)) {
+            return false;
+        }
+        return ((!isSystemTtyEnabled(mContext).directQuery())
+                || (isTtyOnVolteEnabled(mSubId).directQuery()));
+    }
+
     /**
      * Get user's configuration
      *
@@ -50,8 +70,6 @@ public class VtQueryImsState {
         if (!SubscriptionManager.isValidSubscriptionId(mSubId)) {
             return false;
         }
-        ImsManager imsManager = ImsManager.getInstance(mContext, SubscriptionUtil.getPhoneId(
-                    mContext, mSubId));
-        return imsManager.isVtEnabledByUser();
+        return isEnabledByUser(mSubId).directQuery();
     }
 }

src/com/android/settings/network/telephony/VideoCallingPreferenceController.java

@@ -105,7 +105,7 @@ public class VideoCallingPreferenceController extends TelephonyTogglePreferenceC
         switchPreference.setVisible(videoCallEnabled);
         if (videoCallEnabled) {
             final boolean videoCallEditable = queryVoLteState(mSubId).isEnabledByUser()
-                    && mImsManager.isNonTtyOrTtyOnVolteEnabled();
+                    && queryImsState(mSubId).isAllowUserControl();
             preference.setEnabled(videoCallEditable
                     && mCallState == TelephonyManager.CALL_STATE_IDLE);
             switchPreference.setChecked(videoCallEditable && isChecked());