Bluetooth : fix for crashing alertDialogbox

- changes for crashing of alertDialogbox while displaying message
- in showError function, this fix code shoud be added in case of showing error pop up

Bug: 5068089
Change-Id: I40e8a699461832b7bd47080b40f467572632d412
Signed-off-by: jhtop.kim <jhtop.kim@samsung.com>

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

@@ -79,6 +79,10 @@ public final class LocalBluetoothManager {
         return mContext;
     }
 
+    public Context getForegroundActivity() {
+        return mForegroundActivity;
+    }
+
     boolean isForegroundActivity() {
         return mForegroundActivity != null;
     }

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

@@ -89,11 +89,17 @@ final class Utils {
 
     static void showError(Context context, String name, int messageResId) {
         String message = context.getString(messageResId, name);
-        new AlertDialog.Builder(context)
+        LocalBluetoothManager manager = LocalBluetoothManager.getInstance(context);
+        Context activity = manager.getForegroundActivity();
+        if(manager.isForegroundActivity()) {
+            new AlertDialog.Builder(activity)
                 .setIcon(android.R.drawable.ic_dialog_alert)
                 .setTitle(R.string.bluetooth_error_title)
                 .setMessage(message)
                 .setPositiveButton(android.R.string.ok, null)
                 .show();
+        } else {
+            Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
+        }
     }
 }