APK+WebSocket source code repair and optimization list
Budget: $30 – $250 SGD
Fixes:
Heartbeat Mechanism: The client pings every 30 seconds, and the server pongs. Check the source code for missing heartbeats or excessively long intervals.
Reconnection After Disconnection: Implement exponential backoff (1s → 2s → 5s → 10s) to avoid overwhelming the server with a large number of instantaneous reconnections.
ACK Mechanism: Each message has a unique message_id; an ACK is sent upon receipt, otherwise the server resends the message.
Long Connection Management: Detect and clean up zombie connections to prevent memory leaks.
Message Encryption: AES/RSA + TLS; check for plaintext transmissions or hard-coded keys.
Optimization Suggestions:
Encapsulate a WebSocket client library for centralized management of all network operations.
Reconnection and heartbeat should be handled by independent coroutines/threads to avoid blocking the UI.
Support automatic reconnection upon network disconnection or network switching.
2️⃣ Data Layer
Fixes:
Offline Message Caching: Whether messages are saved after a disconnection and whether they can be recovered after reconnection.
Local Storage: Is Room/SharedPreferences secure? Are there any multi-threaded write conflicts?
Message Queue Processing: Are messages processed in order? Is there a possibility of out-of-order processing causing business logic errors?
Optimization Suggestion: Use a unified repository model to manage all data sources.
Use a unified interface for network message inbound and outbound processing.
Implement cache expiration policies and maximum message count limits to prevent memory overflow.
3️⃣ Business Layer (Domain)
Fixed Issues:
Message Parsing: Check for uncaught exceptions in JSON/Proto parsing to prevent crashes.
Authorization Verification: Are tokens or device IDs strictly validated to prevent unauthorized operations.
ACK Logic: Are any message receipts missing, leading to duplicate sending or message loss?
Optimization Suggestion: Decouple all business logic from the network layer.
Exception capture + logging to prevent the entire APK from crashing.
4️⃣ UI Layer (Presentation)
Fixed Issues:
UI directly calling the network layer → the application may experience ANR (Application Not Responding).
Stateless message updates → UI refresh errors or lag.
Optimization suggestion: Use ViewModel/LiveData or StateFlow to manage state.
Place all network or time-consuming operations in coroutines/threads.
The UI should only handle display and user interaction.
5️⃣ Security Layer
Fixed issues: Transmitting sensitive information in plaintext.
Tokens/Keys hardcoded in the source code.
The APK is not obfuscated, making it easy to decompile.
Optimization suggestion: All messages must be encrypted (TLS + AES/RSA).
Tokens/keys should not be hardcoded; they can be obtained from the server or stored securely.
Enable ProGuard/R8 obfuscation of critical classes.
6️⃣ Performance and Stability
Fixed issues: Heartbeat or message processing blocking the main thread → causing lag.
Long-connection memory leaks; APK crashes with many connections.
Server-side message loss under high concurrency.
Optimization suggestion: Handle WebSockets in a separate coroutine/thread; UI should not be blocked.
Messages are queued and processed asynchronously to prevent out-of-order delivery.
The server is configured with a limited number of connections, and Redis/Kafka is used for message caching and distribution.
Heartbeat Mechanism: The client pings every 30 seconds, and the server pongs. Check the source code for missing heartbeats or excessively long intervals.
Reconnection After Disconnection: Implement exponential backoff (1s → 2s → 5s → 10s) to avoid overwhelming the server with a large number of instantaneous reconnections.
ACK Mechanism: Each message has a unique message_id; an ACK is sent upon receipt, otherwise the server resends the message.
Long Connection Management: Detect and clean up zombie connections to prevent memory leaks.
Message Encryption: AES/RSA + TLS; check for plaintext transmissions or hard-coded keys.
Optimization Suggestions:
Encapsulate a WebSocket client library for centralized management of all network operations.
Reconnection and heartbeat should be handled by independent coroutines/threads to avoid blocking the UI.
Support automatic reconnection upon network disconnection or network switching.
2️⃣ Data Layer
Fixes:
Offline Message Caching: Whether messages are saved after a disconnection and whether they can be recovered after reconnection.
Local Storage: Is Room/SharedPreferences secure? Are there any multi-threaded write conflicts?
Message Queue Processing: Are messages processed in order? Is there a possibility of out-of-order processing causing business logic errors?
Optimization Suggestion: Use a unified repository model to manage all data sources.
Use a unified interface for network message inbound and outbound processing.
Implement cache expiration policies and maximum message count limits to prevent memory overflow.
3️⃣ Business Layer (Domain)
Fixed Issues:
Message Parsing: Check for uncaught exceptions in JSON/Proto parsing to prevent crashes.
Authorization Verification: Are tokens or device IDs strictly validated to prevent unauthorized operations.
ACK Logic: Are any message receipts missing, leading to duplicate sending or message loss?
Optimization Suggestion: Decouple all business logic from the network layer.
Exception capture + logging to prevent the entire APK from crashing.
4️⃣ UI Layer (Presentation)
Fixed Issues:
UI directly calling the network layer → the application may experience ANR (Application Not Responding).
Stateless message updates → UI refresh errors or lag.
Optimization suggestion: Use ViewModel/LiveData or StateFlow to manage state.
Place all network or time-consuming operations in coroutines/threads.
The UI should only handle display and user interaction.
5️⃣ Security Layer
Fixed issues: Transmitting sensitive information in plaintext.
Tokens/Keys hardcoded in the source code.
The APK is not obfuscated, making it easy to decompile.
Optimization suggestion: All messages must be encrypted (TLS + AES/RSA).
Tokens/keys should not be hardcoded; they can be obtained from the server or stored securely.
Enable ProGuard/R8 obfuscation of critical classes.
6️⃣ Performance and Stability
Fixed issues: Heartbeat or message processing blocking the main thread → causing lag.
Long-connection memory leaks; APK crashes with many connections.
Server-side message loss under high concurrency.
Optimization suggestion: Handle WebSockets in a separate coroutine/thread; UI should not be blocked.
Messages are queued and processed asynchronously to prevent out-of-order delivery.
The server is configured with a limited number of connections, and Redis/Kafka is used for message caching and distribution.