Update BT header using BT metadata

As for unthethered headset, get BT data from BT metadata, rather than
CachedBluetoothDevice

Bug: 122460277
Test: RunSettingsRoboTests
Change-Id: Ifb5507cbbce9602726ba272c12d1bf95eff91001

src/com/android/settings/bluetooth/Utils.java

@@ -47,6 +47,8 @@ public final class Utils {
     static final boolean V = BluetoothUtils.V; // verbose logging
     static final boolean D =  BluetoothUtils.D;  // regular logging
 
+    public static final int META_INT_ERROR = -1;
+
     private Utils() {
     }
 
@@ -152,4 +154,29 @@ public final class Utils {
         return Settings.Global.getInt(context.getContentResolver(),
                 Settings.Global.BLE_SCAN_ALWAYS_AVAILABLE, 0) == 1;
     }
+
+    public static boolean getBooleanMetaData(BluetoothDevice bluetoothDevice, int key) {
+        if (bluetoothDevice == null) {
+            return false;
+        }
+        return Boolean.parseBoolean(bluetoothDevice.getMetadata(key));
+    }
+
+    public static String getStringMetaData(BluetoothDevice bluetoothDevice, int key) {
+        if (bluetoothDevice == null) {
+            return null;
+        }
+        return bluetoothDevice.getMetadata(key);
+    }
+
+    public static int getIntMetaData(BluetoothDevice bluetoothDevice, int key) {
+        if (bluetoothDevice == null) {
+            return META_INT_ERROR;
+        }
+        try {
+            return Integer.parseInt(bluetoothDevice.getMetadata(key));
+        } catch (NumberFormatException e) {
+            return META_INT_ERROR;
+        }
+    }
 }