Refine the plural strings design in SettingsLib

- Use MessageFormat instead of getQuantityString().

Bug: 199229953
Test: manual test
See b/199229953#comment2 for a screenshot result.

Change-Id: Id47e12814b3a4f7830d70cfe53e4d6df8cc38e24

packages/SettingsLib/res/values/strings.xml

@@ -1271,10 +1271,13 @@
     <string name="wifi_status_mac_randomized">MAC is randomized</string>
 
     <!-- Summary to show how many devices are connected in wifi hotspot [CHAR LIMIT=NONE] -->
-    <plurals name="wifi_tether_connected_summary">
-        <item quantity="one">%1$d device connected</item>
-        <item quantity="other">%1$d devices connected</item>
-    </plurals>
+    <string name="wifi_tether_connected_summary">
+        {count, plural,
+            =0    {0 device connected}
+            =1    {1 device connected}
+            other {# devices connected}
+        }
+    </string>
 
     <!-- Content description of zen mode time condition plus button (not shown on the screen). [CHAR LIMIT=NONE] -->
     <string name="accessibility_manual_zen_more_time">More time.</string>

packages/SettingsLib/src/com/android/settingslib/wifi/WifiUtils.java

@@ -22,6 +22,7 @@ import static android.net.wifi.WifiConfiguration.NetworkSelectionStatus.getMaxNe
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.drawable.Drawable;
+import android.icu.text.MessageFormat;
 import android.net.wifi.ScanResult;
 import android.net.wifi.WifiConfiguration;
 import android.net.wifi.WifiConfiguration.NetworkSelectionStatus;
@@ -33,6 +34,8 @@ import androidx.annotation.VisibleForTesting;
 
 import com.android.settingslib.R;
 
+import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 
 public class WifiUtils {
@@ -333,4 +336,20 @@ public class WifiUtils {
         intent.putExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS, bundle);
         return intent;
     }
+
+    /**
+     * Returns the string of Wi-Fi tethering summary for connected devices.
+     *
+     * @param context          The application context
+     * @param connectedDevices The count of connected devices
+     */
+    public static String getWifiTetherSummaryForConnectedDevices(Context context,
+            int connectedDevices) {
+        MessageFormat msgFormat = new MessageFormat(
+                context.getResources().getString(R.string.wifi_tether_connected_summary),
+                Locale.getDefault());
+        Map<String, Object> arguments = new HashMap<>();
+        arguments.put("count", connectedDevices);
+        return msgFormat.format(arguments);
+    }
 }