Settings: Add LineageOS legal info

Open up the LineageOS legal info in the browser.

Change-Id: I263ccc0509e275d17512528deb606341d58e7a0d
Ticket-Id: CYNGNOS-1895
Signed-off-by: Roman Birg <roman@cyngn.com>

res/values/cm_strings.xml

@@ -22,4 +22,7 @@
     <!-- Backup Transport selection settings menu and activity title -->
     <string name="backup_transport_setting_label">Change backup provider</string>
     <string name="backup_transport_title">Select backup provider</string>
+
+    <!-- Device Info screen. LineageOS legal. -->
+    <string name="lineagelicense_title">LineageOS legal</string>
 </resources>

res/xml/about_legal.xml

@@ -35,6 +35,12 @@
         android:title="@string/license_title"
         settings:controller="com.android.settings.deviceinfo.legal.LicensePreferenceController" />
 
+    <!-- LineageOS License information -->
+    <Preference
+        android:key="lineage_license"
+        android:title="@string/lineagelicense_title"
+        settings:controller="com.android.settings.deviceinfo.legal.LineageLicensePreferenceController" />
+
     <!-- Terms and conditions -->
     <Preference
         android:key="terms"

src/com/android/settings/deviceinfo/legal/LineageLicensePreferenceController.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2021 The LineageOS 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.legal;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.SystemProperties;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+
+public class LineageLicensePreferenceController extends BasePreferenceController {
+
+    private static final String PROPERTY_LINEAGE_LICENSE_URL = "ro.lineagelegal.url";
+
+    public LineageLicensePreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        Preference preference = screen.findPreference(getPreferenceKey());
+        if (preference != null) {
+            preference.setOnPreferenceClickListener(pref -> {
+                mContext.startActivity(getIntent());
+                return true;
+            });
+        }
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (getIntent().resolveActivity(mContext.getPackageManager()) != null) {
+            return AVAILABLE;
+        } else {
+            return UNSUPPORTED_ON_DEVICE;
+        }
+    }
+
+    private Intent getIntent() {
+        return new Intent(Intent.ACTION_VIEW,
+                Uri.parse(SystemProperties.get(PROPERTY_LINEAGE_LICENSE_URL)));
+    }
+}