Add a RTT setting in A11y screen

- Add RTT setting in Accessibility screen.
- Create a controller for RTT setting preference.
- Create an array strings to define the subtext.

Test: Rebuild, and visual
Change-Id: I248654c822284473b8a8265de4a3938af89cdf7a
Merged-In: I248654c822284473b8a8265de4a3938af89cdf7a
Fix: 146540478

src/com/android/settings/accessibility/AccessibilitySettings.java

@@ -121,6 +121,7 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
             "accessibility_shortcut_preference";
     private static final String HEARING_AID_PREFERENCE =
             "hearing_aid_preference";
+    private static final String RTT_SETTINGS_SCREEN = "rtt_setting";
     private static final String CAPTIONING_PREFERENCE_SCREEN =
             "captioning_preference_screen";
     private static final String DISPLAY_MAGNIFICATION_PREFERENCE_SCREEN =
@@ -240,6 +241,7 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
     private Preference mAccessibilityShortcutPreferenceScreen;
     private Preference mDisplayDaltonizerPreferenceScreen;
     private Preference mHearingAidPreference;
+    private Preference mRTTPreference;
     private Preference mVibrationPreferenceScreen;
     private Preference mLiveCaptionPreference;
     private SwitchPreference mToggleInversionPreference;
@@ -248,6 +250,7 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
     private SwitchPreference mDarkUIModePreference;
     private DarkUIPreferenceController mDarkUIPreferenceController;
     private LiveCaptionPreferenceController mLiveCaptionPreferenceController;
+    private RTTSettingPreferenceController mRTTSettingPreferenceController;
 
     private int mLongPressTimeoutDefault;
 
@@ -309,6 +312,9 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
 
         mLiveCaptionPreferenceController = new LiveCaptionPreferenceController(context,
                 LIVE_CAPTION_PREFERENCE_KEY);
+        mRTTSettingPreferenceController =
+                new RTTSettingPreferenceController(context, RTT_SETTINGS_SCREEN);
+
     }
 
     @Override
@@ -503,6 +509,11 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
         mHearingAidPreference = findPreference(HEARING_AID_PREFERENCE);
         mHearingAidPreferenceController.displayPreference(getPreferenceScreen());
 
+        // RTT Setting
+        mRTTPreference = findPreference(RTT_SETTINGS_SCREEN);
+        mRTTSettingPreferenceController.displayPreference(getPreferenceScreen());
+
+
         // Captioning.
         mCaptioningPreferenceScreen = findPreference(CAPTIONING_PREFERENCE_SCREEN);
 
@@ -787,6 +798,8 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
 
         mHearingAidPreferenceController.updateState(mHearingAidPreference);
 
+        mRTTSettingPreferenceController.updateState(mRTTPreference);
+
         mLiveCaptionPreferenceController.updateState(mLiveCaptionPreference);
 
         updateFeatureSummary(Settings.Secure.ACCESSIBILITY_CAPTIONING_ENABLED,

src/com/android/settings/accessibility/RTTSettingPreferenceController.java

@@ -0,0 +1,87 @@
+/*
+ * 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.accessibility;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.provider.Settings;
+import android.telecom.TelecomManager;
+import android.text.TextUtils;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import java.util.List;
+
+/** A controller to control the status for RTT setting in Accessibility screen.*/
+public class RTTSettingPreferenceController extends BasePreferenceController {
+
+    private static final String DIALER_RTT_CONFIGURATION = "dialer_rtt_configuration";
+
+    private final Context mContext;
+    private final PackageManager mPackageManager;
+    private final TelecomManager mTelecomManager;
+    private final CharSequence[] mModes;
+    private final String mDialerPackage;
+
+    @VisibleForTesting
+    Intent mRTTIntent;
+
+    public RTTSettingPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mContext = context;
+        mModes = mContext.getResources().getTextArray(R.array.rtt_setting_mode);
+        mDialerPackage = mContext.getString(R.string.config_rtt_setting_package_name);
+        mPackageManager = context.getPackageManager();
+        mTelecomManager = context.getSystemService(TelecomManager.class);
+        mRTTIntent = new Intent(context.getString(R.string.config_rtt_setting_intent_action));
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        final List<ResolveInfo> resolved =
+                mPackageManager.queryIntentActivities(mRTTIntent, 0 /* flags */);
+        return resolved != null && !resolved.isEmpty() && isDialerSupportRTTSetting()
+                ? AVAILABLE
+                : UNSUPPORTED_ON_DEVICE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final Preference pref = screen.findPreference(getPreferenceKey());
+        pref.setIntent(mRTTIntent);
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        final int option = Settings.Secure.getInt(mContext.getContentResolver(),
+                DIALER_RTT_CONFIGURATION, 1 /* not visible */);
+        return mModes[option];
+    }
+
+    @VisibleForTesting
+    boolean isDialerSupportRTTSetting() {
+        return TextUtils.equals(mTelecomManager.getDefaultDialerPackage(), mDialerPackage);
+    }
+}