Android Academy · Lesson

Debugging & Profiling

Master Android Studio's debugging and profiling tools: breakpoints, Logcat, Timber, Memory Profiler, LeakCanary, CPU Profiler, Network Inspector, and Layout Inspector.

Debugging Overview

Debugging is the process of finding and fixing bugs. Android Studio provides powerful tools:

Debugger — pause execution, inspect variables, step through code
Logcat — real-time log output from the device
Layout Inspector — inspect the live UI hierarchy
Android Profiler — CPU, Memory, and Network analysis
Database Inspector — view and query Room databases live

Logcat — Your First Debug Tool

Use Log to print messages to Logcat. Use a TAG to filter your logs:

import android.util.Log

class UserRepository {
    companion object {
        private const val TAG = "UserRepo"
    }

    fun fetchUsers() {
        Log.d(TAG, "fetchUsers() called")        // Debug
        Log.i(TAG, "Fetching ${users.size} users") // Info
        Log.w(TAG, "Cache is empty")               // Warning
        Log.e(TAG, "Network error: $exception")    // Error
    }
}

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