Pattern Viewer Privacy Policy

Chinese Version  ·  Last updated: July 14, 2026

1. Introduction

This Privacy Policy applies to the Android mobile application "Pattern Viewer" (hereinafter "the App") developed and operated by Xi'an Pattern Co., Ltd. ("we", "us", or "our").

We understand the importance of personal information to you. In accordance with applicable laws and regulations, we have implemented appropriate security measures to protect your personal information. With that in mind, we have formulated this Privacy Policy and remind you to:

• Please read this Privacy Policy carefully and fully understand it before using the App. Use the App only after confirming your understanding and consent.
• The App is intended for professional engineers and technicians to view and analyze antenna pattern data files.

2. Information We Collect

2.1 Information You Actively Provide

The App only reads the following content when you actively perform an action:

Type	Specific Content	Purpose
File content	The .sed or .msi file you choose to open	Parse antenna pattern data and display it within the App
File name	File name and extension	Display in the App interface for your reference

The above data is only temporarily processed in your device's memory. It is not written to persistent storage and is not uploaded to any server.

2.2 Device Permissions

To enable file reading functionality, the App requires you to grant the following permissions:

Permission	Purpose	Required?
READ_EXTERNAL_STORAGE	Read antenna data files (.sed / .msi) from your device storage	Required (App cannot load files without it)
READ_MEDIA_FILES (Android 13+)	Replacement permission on Android 13 and above	Required

2.3 Automatically Collected Information

The App does not automatically collect any information, including but not limited to:

• Device identifiers (IMEI / Android ID / MAC address, etc.)
• Device location information
• Device model, operating system version (used only for compatibility checks, not uploaded)
• App usage behavior data
• Crash logs (no third-party crash analytics SDK is integrated)

2.4 Third-Party Collection

The App does not integrate any third-party SDK, analytics, push notification, or advertising service. Therefore, no third party collects your information through the App.

3. How We Use Information

The information described above is used only for the following purposes:

1. Parse and display the antenna pattern data file you selected;
2. Display basic information such as the file name in the App interface;
3. Ensure the normal operation of the App and its core functions.

We will NOT use your information for:

• User profiling or behavior analysis
• Advertising or precision marketing
• Providing or selling to any third party
• Any purpose beyond the App's stated functionality

4. Information Storage and Transmission

4.1 Storage Location

The App does not write any persistent data. The content of the .sed / .msi files you open exists only temporarily in the App process memory and is released immediately when the App is closed. The "Recent Files" feature only saves a list of file names in local preferences (DataStore) and does not save file content.

4.2 Data Transmission

All data processing is completed locally on your device. No network transmission is involved:

• No files are uploaded to any server
• No statistics or analytics data is sent externally
• No remote API calls are made
• The application manifest (AndroidManifest.xml) does not declare the INTERNET permission

5. Third-Party Sharing

The App has no third-party sharing behavior:

• No information is provided, shared, or sold to any third party
• No third-party SDK is integrated
• No advertising network is integrated
• No analytics, statistics, or push notification service is integrated

6. Your Rights

Under applicable laws and regulations, you have the following rights regarding your personal information:

1. Right to know and decide: You have the right to know how the App processes your information;
2. Right of access: You can view loaded data within the App;
3. Right of deletion: You can close the App at any time to clear in-memory data;
4. Right to withdraw consent: You can revoke the App's storage read permission in system settings at any time (after revocation, the App cannot load files);
5. Account cancellation: Not applicable — the App does not have an account system.

7. Data Security

We adopt the following measures to safeguard your information:

• All data processing is completed locally on the device, with no dependency on any network service;
• The App uses R8 code obfuscation and resource compression to increase the difficulty of reverse engineering;
• The release version is signed with a release certificate to prevent tampering;
• No sensitive user information is stored, fundamentally eliminating the risk of data leakage.

8. Children's Privacy

The App is intended for professional engineers and technicians and is not directed at children under 14. We do not knowingly collect personal information from children. If you are a minor, please use the App under the supervision of a guardian.

9. Policy Changes

If this Privacy Policy changes, we will notify you by:

• Posting a change notice prominently within the App;
• Updating the "Last updated" date of this Privacy Policy.

For material changes, we will seek your renewed consent.

10. Contact Us

If you have any questions, comments, or suggestions regarding this Privacy Policy or your personal information protection, please contact us at:

We will respond within 15 business days of receiving your feedback.

11. Effective Date

This Privacy Policy takes effect on July 14, 2026.