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mobile-app-debugging

Mobile app debugging for iOS, Android, cross-platform frameworks. Use for crashes, memory leaks, performance issues, network problems, or encountering Xcode instruments, Android Profiler, React Native debugger, native bridge errors.

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Mobile App Debugging

Debug mobile applications across iOS, Android, and cross-platform frameworks.

iOS Debugging (Xcode)

// Breakpoint with condition
// Right-click breakpoint > Edit > Condition: userId == "123"

// LLDB commands
po variable          // Print object
p expression         // Evaluate expression
bt                   // Backtrace

Memory Debugging

  • Use Memory Graph Debugger to find retain cycles
  • Enable Zombie Objects for use-after-free bugs
  • Profile with Instruments > Leaks

Android Debugging (Android Studio)

// Logcat filtering
Log.d("TAG", "Debug message")
Log.e("TAG", "Error", exception)

// Filter: tag:MyApp level:error

Common Issues

  • ANR: Check main thread blocking
  • OOM: Profile with Memory Profiler
  • Layout issues: Use Layout Inspector

React Native

// Remote debugging
// Shake device > Debug JS Remotely

// Console logging
console.log('Debug:', variable);
console.warn('Warning');
console.error('Error');

// Performance Monitor
// Shake > Show Perf Monitor
// Target: 60 FPS, <16ms per frame

Network Debugging

// Intercept requests
XMLHttpRequest.prototype._send = XMLHttpRequest.prototype.send;
XMLHttpRequest.prototype.send = function() {
  console.log('Request:', this._url);
  this._send.apply(this, arguments);
};

Debug Checklist

  • Test on physical devices (not just simulators)
  • Test on older device models
  • Simulate slow 3G network
  • Test offline mode
  • Check memory under load
  • Test rotation and safe areas
  • Verify 60 FPS target

Performance Targets

MetricTarget
Frame rate60 FPS (16ms/frame)
Memory<100MB
App launch<2 seconds

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