[Settings] Move display of VPN version into summary text

Move the display of version text within VPN into summary part of the
display, and limit the height of summary area.

Bug: 205460459
Test: install apk from b/205460459#comment3 and verify
Change-Id: I666b9db356feeebf04e3be688897c2d9110a5275
(cherry picked from commit 144f295d7a)
Merged-In: I666b9db356feeebf04e3be688897c2d9110a5275

res/values/strings.xml

@@ -6804,7 +6804,7 @@
     <!-- Button label to disconnect from a VPN profile. [CHAR LIMIT=40] -->
     <string name="vpn_disconnect">Disconnect</string>
     <!-- Field label to show the version number for a VPN app. [CHAR LIMIT=40] -->
-    <string name="vpn_version">Version <xliff:g id="version" example="3.3.0">%s</xliff:g></string>
+    <string name="vpn_version">Version</string>
     <!-- Button label to forget a VPN profile [CHAR LIMIT=40] -->
     <string name="vpn_forget_long">Forget VPN</string>
     <!-- Dialog message title to set another VPN app to be always-on [CHAR LIMIT=40] -->

res/values/styles.xml

@@ -235,6 +235,16 @@
         <item name="android:textAppearance">@android:style/TextAppearance.DeviceDefault.Small</item>
     </style>
 
+    <style name="vpn_app_management_version_title">
+        <item name="android:textAppearance">?android:attr/textAppearanceListItem</item>
+        <item name="android:textColor">?android:attr/textColorPrimary</item>
+    </style>
+
+    <style name="vpn_app_management_version_summary">
+        <item name="android:textAppearance">?android:attr/textAppearanceListItemSecondary</item>
+        <item name="android:textColor">?android:attr/textColorSecondary</item>
+    </style>
+
     <style name="TextAppearance" parent="android:TextAppearance.DeviceDefault"/>
 
     <style name="TextAppearance.info_label">

res/xml/vpn_app_management.xml

@@ -15,14 +15,24 @@
 -->
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:settings="http://schemas.android.com/apk/res-auto">
+        xmlns:settings="http://schemas.android.com/apk/res-auto"
+        orderingFromXml="false"
+        >
+
+        <!-- To limit the size (in height) of version Preference displayed here,
+             maximum height of TextView need to be set programmingly.
+             Therefore, this Preference got removed from here and will be added
+             dynamically through source code.
 
         <Preference
+                android:order="0"
                 android:key="version"
                 android:textColor="?android:attr/textColorSecondary"
                 android:selectable="false"/>
+        -->
 
         <com.android.settingslib.RestrictedSwitchPreference
+                android:order="10"
                 android:key="always_on_vpn"
                 android:title="@string/vpn_menu_lockdown"
                 android:defaultValue="false"
@@ -32,6 +42,7 @@
                 settings:restrictedSwitchSummary="@string/disabled_by_admin_summary_text" />
 
         <com.android.settingslib.RestrictedSwitchPreference
+                android:order="20"
                 android:key="lockdown_vpn"
                 android:title="@string/vpn_require_connection"
                 android:defaultValue="false"
@@ -41,6 +52,7 @@
                 settings:restrictedSwitchSummary="@string/disabled_by_admin_summary_text" />
 
         <com.android.settingslib.RestrictedPreference
+                android:order="30"
                 android:key="forget_vpn"
                 android:title="@string/vpn_forget_long"
                 android:icon="@drawable/ic_delete"

src/com/android/settings/vpn2/AppManagementFragment.java

@@ -37,11 +37,13 @@ import android.os.UserHandle;
 import android.os.UserManager;
 import android.text.TextUtils;
 import android.util.Log;
+import android.widget.TextView;
 
 import androidx.annotation.VisibleForTesting;
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.DialogFragment;
 import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
 
 import com.android.internal.net.VpnConfig;
 import com.android.internal.util.ArrayUtils;
@@ -81,7 +83,6 @@ public class AppManagementFragment extends SettingsPreferenceFragment
     private String mVpnLabel;
 
     // UI preference
-    private Preference mPreferenceVersion;
     private RestrictedSwitchPreference mPreferenceAlwaysOn;
     private RestrictedSwitchPreference mPreferenceLockdown;
     private RestrictedPreference mPreferenceForget;
@@ -128,7 +129,6 @@ public class AppManagementFragment extends SettingsPreferenceFragment
         mConnectivityService = IConnectivityManager.Stub
                 .asInterface(ServiceManager.getService(Context.CONNECTIVITY_SERVICE));
 
-        mPreferenceVersion = findPreference(KEY_VERSION);
         mPreferenceAlwaysOn = (RestrictedSwitchPreference) findPreference(KEY_ALWAYS_ON_VPN);
         mPreferenceLockdown = (RestrictedSwitchPreference) findPreference(KEY_LOCKDOWN_VPN);
         mPreferenceForget = (RestrictedPreference) findPreference(KEY_FORGET_VPN);
@@ -144,9 +144,52 @@ public class AppManagementFragment extends SettingsPreferenceFragment
 
         boolean isInfoLoaded = loadInfo();
         if (isInfoLoaded) {
-            mPreferenceVersion.setTitle(
-                    getPrefContext().getString(R.string.vpn_version, mPackageInfo.versionName));
             updateUI();
+
+            Preference version = getPreferenceScreen().findPreference(KEY_VERSION);
+            if (version != null) {
+                // Version field has been added.
+                return;
+            }
+
+            /**
+             * Create version field at runtime, and set max height on the display area.
+             *
+             * When long length of text given within version field, a large text area
+             * might be created and inconvenient to the user (User need to scroll
+             * for a long time in order to get to the Preferences after this field.)
+             */
+            version = new Preference(getPrefContext()) {
+                @Override
+                public void onBindViewHolder(PreferenceViewHolder holder) {
+                    super.onBindViewHolder(holder);
+
+                    TextView titleView =
+                            (TextView) holder.findViewById(android.R.id.title);
+                    if (titleView != null) {
+                        titleView.setTextAppearance(R.style.vpn_app_management_version_title);
+                    }
+
+                    TextView summaryView =
+                            (TextView) holder.findViewById(android.R.id.summary);
+                    if (summaryView != null) {
+                        summaryView.setTextAppearance(R.style.vpn_app_management_version_summary);
+
+                        // Set max height in summary area.
+                        int versionMaxHeight = getListView().getHeight();
+                        summaryView.setMaxHeight(versionMaxHeight);
+                        summaryView.setVerticalScrollBarEnabled(false);
+                        summaryView.setHorizontallyScrolling(false);
+                    }
+                }
+            };
+            version.setOrder(0);            // Set order to 0 in order to be placed
+                                            // in front of other Preference(s).
+            version.setKey(KEY_VERSION);    // Set key to avoid from creating multi instance.
+            version.setTitle(R.string.vpn_version);
+            version.setSummary(mPackageInfo.versionName);
+            version.setSelectable(false);
+            getPreferenceScreen().addPreference(version);
         } else {
             finish();
         }