Yes, by modifying the source code of the mobile application, real-time monitoring of user behavior can be achieved to a certain extent. This monitoring usually involves collecting user interaction data, such as clicks, browsing history, geographic location, etc. However, the following points need to be noted: 1. **User privacy and legal compliance**: In many countries and regions, collecting and monitoring user data is subject to relevant privacy laws and regulations, such as GDPR (EU) or CCPA (California). These regulations require that applications must obtain explicit consent from users and inform them of the purpose of the data. 2. **Transparency and user consent**: Applications should clearly inform users of the type of data they collect, the purpose, and the sharing of the data. Informed consent from users to data collection is an important part of compliance. 3. **Data security**: The collected data must be stored securely and appropriate technical measures must be taken to prevent data leakage or unauthorized access. 4. **Impact on user experience**: Excessive background data collection may affect the performance of the application and consume more battery and data traffic, thereby reducing the user experience. 5. **Development technology**: Implementing real-time monitoring usually involves writing code to capture user events and using backend services to process this data in real time. This may require the use of real-time databases, event stream processing technologies, etc. When carrying out such development, it is important to prioritize and follow legal regulations and ethical standards. Monitoring activities without the user's knowledge and consent may lead to legal issues and loss of user trust.