[LeakScope] 3 Android lifecycle/memory violations detected

[MuhammadTehamsibAliTashfeen]

LeakScope: Android Lifecycle & Memory Leak Violations

About this report: This issue was automatically generated by LeakScope, a static analysis tool for Android lifecycle violations and memory leaks built on the Soot framework. This is part of an ongoing academic research study targeting ICSE 2027. No immediate action is required — we would greatly appreciate your feedback on whether these findings are accurate.

Summary

LeakScope detected 3 potential issue(s) across 3 detector type(s):

Severity	Count
🔴 High	2
🟡 Medium	0
🟢 Low (improvement opportunity)	1

Detector	Count	Severity	Description
FragmentViewFieldRetentionLeak	1	🔴 High	Fragment stores View references in instance fields not cleared in onDestroyView()
ThreadedUIReference	1	🔴 High	Worker thread captures Activity/Fragment/View reference
ViewBindingOpportunity	1	🟢 Low	Manual findViewById() calls — ViewBinding migration opportunity

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Detailed Findings

🔴 FragmentViewFieldRetentionLeak

Fragment stores View references in instance fields not cleared in onDestroyView()

Finding #1 — TerminalFragment

Fragment View Field Retention Leak Detected
Class: de.kai_morich.simple_bluetooth_le_terminal.TerminalFragment

Issue:
- Fragment stores View references in instance fields
- These fields are not cleared when the view is destroyed

- onDestroyView() is missing

Leaked Fields:
  • receiveText : android.widget.TextView (assigned in onCreateView)
  • sendText : android.widget.TextView (assigned in onCreateView)

Why this is dangerous:
- Fragment views are destroyed/recreated on config changes
- Retained View references prevent garbage collection
- Leaked Views hold references to Activity Context
- Can cause OutOfMemoryError with repeated Fragment transactions

Recommended Fix:
Override onDestroyView() and clear all View/Binding fields:
  @Override
  public void onDestroyView() {
    super.onDestroyView();
    receiveText = null;
    sendText = null;
  }

🔴 ThreadedUIReference

Worker thread captures Activity/Fragment/View reference

Finding #2 — DevicesFragment\n// (Full source code omitted for brevity)\n"

{
  "text_input": "package de.kai_morich.simple_bluetooth_le_terminal;\n\n// Class: de.kai_morich.simple_bluetooth_le_terminal.DevicesFragment\n// (Full source code omitted for brevity)\n",
  "output": "Yes",
  "project": "simple_bluetooth_le_terminal",
  "explanation": "Scenario 1: Worker thread holds UI object reference\nClass: de.kai_morich.simple_bluetooth_le_terminal.DevicesFragment\nMethod: void startScan()\nStatement: r17 \u003d new java.lang.Thread\nCaptured UI objects:\n  - r0 : de.kai_morich.simple_bluetooth_le_terminal.DevicesFragment\nRisk: UI object will be kept in memory until thread completes\nFix: Use WeakReference or avoid passing UI objects to worker threads\n"
}
{
  "text_input": "package de.kai_morich.simple_bluetooth_le_terminal;\n\n// Class: de.kai_morich.simple_bluetooth_le_terminal.DevicesFragment\n// (Full source code omitted for brevity)\n",
  "output": "Yes",
  "project": "simple_bluetooth_le_terminal",
  "explanation": "Scenario 1: Worker thread holds UI obj
… (truncated for brevity)

🟢 ViewBindingOpportunity

Manual findViewById() calls — ViewBinding migration opportunity

Finding #3 — MainActivity

View Binding Migration Opportunity
Class: de.kai_morich.simple_bluetooth_le_terminal.MainActivity
Type: Activity
Current Pattern: Manual view lookup
findViewById() Calls:
  • findViewById in onCreate
Benefits of View Binding:
- Eliminates boilerplate findViewById() calls
- Compile-time type safety for view references
- Reduced null pointer exceptions
- Cleaner, more maintainable code
Note: This is a code modernization suggestion, not a memory leak

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How to respond to this issue:

• If a finding is a true positive: consider applying the recommended fix and closing this issue.
• If a finding is a false positive: please leave a comment explaining why — your feedback directly improves our research.
• If you have questions: reply here or open a discussion.

This report was generated by LeakScope as part of the ICSE 2027 research artifact. Tool analyzes compiled APKs using Soot static analysis on SimpleBluetoothLeTerminal.