diff --git a/verificationcodeview/src/main/java/com/jyn/vcview/AsteriskPasswordTransformationMethod.java b/verificationcodeview/src/main/java/com/jyn/vcview/AsteriskPasswordTransformationMethod.java
new file mode 100644
index 0000000..9fde6e5
--- /dev/null
+++ b/verificationcodeview/src/main/java/com/jyn/vcview/AsteriskPasswordTransformationMethod.java
@@ -0,0 +1,37 @@
+package com.jyn.vcview;
+
+import android.text.method.PasswordTransformationMethod;
+import android.view.View;
+
+/**
+ * Created by jiao on 2019/8/8.
+ */
+public class AsteriskPasswordTransformationMethod extends PasswordTransformationMethod {
+    @Override
+    public CharSequence getTransformation(CharSequence source, View view) {
+        return new PasswordCharSequence(source);
+    }
+
+    private class PasswordCharSequence implements CharSequence {
+        private CharSequence mSource;
+
+        public PasswordCharSequence(CharSequence source) {
+            mSource = source; // Store char sequence
+        }
+
+        @Override
+        public char charAt(int index) {
+            return '•'; // This is the important part
+        }
+
+        @Override
+        public int length() {
+            return mSource.length(); // Return default
+        }
+
+        @Override
+        public CharSequence subSequence(int start, int end) {
+            return mSource.subSequence(start, end); // Return default
+        }
+    }
+}
\ No newline at end of file
diff --git a/verificationcodeview/src/main/java/com/jyn/vcview/VerificationCodeView.java b/verificationcodeview/src/main/java/com/jyn/vcview/VerificationCodeView.java
index e13939a..0a13baa 100644
--- a/verificationcodeview/src/main/java/com/jyn/vcview/VerificationCodeView.java
+++ b/verificationcodeview/src/main/java/com/jyn/vcview/VerificationCodeView.java
@@ -209,7 +209,7 @@ public class VerificationCodeView extends LinearLayout implements TextWatcher, V
                 break;
             case NUMBERPASSWORD:
                 editText.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_VARIATION_PASSWORD);
-                editText.setTransformationMethod(PasswordTransformationMethod.getInstance());
+                editText.setTransformationMethod(new AsteriskPasswordTransformationMethod());
                 break;
             case TEXT:
                 editText.setInputType(InputType.TYPE_CLASS_TEXT);