Add console logs.

app/build.gradle.kts

@@ -49,6 +49,8 @@ dependencies {
     implementation(libs.androidx.compose.ui.graphics)
     implementation(libs.androidx.compose.ui.tooling.preview)
     implementation(libs.androidx.compose.material3)
+    implementation(libs.timber)
+    implementation(libs.kotlinx.coroutines.android)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
@@ -56,4 +58,4 @@ dependencies {
     androidTestImplementation(libs.androidx.compose.ui.test.junit4)
     debugImplementation(libs.androidx.compose.ui.tooling)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
-}
+}

app/src/main/java/dev/adriankuta/visualizer/MainActivity.kt

@@ -42,6 +42,7 @@ import dev.adriankuta.visualizer.components.MetricsSection
 import dev.adriankuta.visualizer.components.PermissionSection
 import dev.adriankuta.visualizer.components.WaveformView
 import dev.adriankuta.visualizer.ui.theme.VisualizerTheme
+import timber.log.Timber
 
 /**
  * Entry point activity that hosts the Compose UI for the audio visualizer demo.
@@ -51,6 +52,10 @@ import dev.adriankuta.visualizer.ui.theme.VisualizerTheme
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        // Initialize Timber for logging
+        Timber.plant(Timber.DebugTree())
+
         enableEdgeToEdge()
         setContent {
             VisualizerTheme {
@@ -103,8 +108,8 @@ private fun VisualizerScreen(modifier: Modifier = Modifier) {
         val observer = LifecycleEventObserver { _, event ->
             if (!permissionGranted) return@LifecycleEventObserver
             when (event) {
-                Lifecycle.Event.ON_START -> runCatching { controller.start() }
-                Lifecycle.Event.ON_STOP -> runCatching { controller.stop() }
+                Lifecycle.Event.ON_CREATE -> runCatching { controller.start() }
+                Lifecycle.Event.ON_DESTROY -> runCatching { controller.stop() }
                 else -> {}
             }
         }
@@ -179,4 +184,4 @@ fun VisualizerPreview() {
     VisualizerTheme {
         VisualizerScreen()
     }
-}
+}

app/src/main/java/dev/adriankuta/visualizer/VisualizerController.kt

@@ -1,6 +1,8 @@
 package dev.adriankuta.visualizer
 
 import android.media.audiofx.Visualizer
+import kotlinx.coroutines.*
+import timber.log.Timber
 
 /**
  * Simple wrapper over Android Visualizer to capture global output mix (audio session 0).
@@ -11,6 +13,10 @@ class VisualizerController(
     private val onFft: (ByteArray) -> Unit,
 ) {
     private var visualizer: Visualizer? = null
+    private val coroutineScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
+    private var loggingJob: Job? = null
+    private var latestWaveform: ByteArray? = null
+    private var latestFft: ByteArray? = null
 
     /**
      * Starts capturing audio data via [Visualizer].
@@ -23,6 +29,7 @@ class VisualizerController(
     fun start() {
         if (visualizer != null) return
         try {
+            Timber.d("Starting audio visualizer listening (audioSessionId: $audioSessionId)")
             val v = Visualizer(audioSessionId)
             // Use the maximum supported capture size for better resolution
             val captureSize = Visualizer.getCaptureSizeRange().let { it[1] }
@@ -34,7 +41,10 @@ class VisualizerController(
                     waveform: ByteArray?,
                     samplingRate: Int
                 ) {
-                    if (waveform != null) onWaveform(waveform)
+                    if (waveform != null) {
+                        latestWaveform = waveform.clone()
+                        onWaveform(waveform)
+                    }
                 }
 
                 override fun onFftDataCapture(
@@ -42,13 +52,22 @@ class VisualizerController(
                     fft: ByteArray?,
                     samplingRate: Int
                 ) {
-                    if (fft != null) onFft(fft)
+                    if (fft != null) {
+                        latestFft = fft.clone()
+                        onFft(fft)
+                    }
                 }
             }, rate, true, true)
             v.enabled = true
             visualizer = v
+
+            // Start coroutine-based logging for raw data samples every 1 second
+            startDataLogging()
+
+            Timber.i("Audio visualizer listening started successfully")
         } catch (e: Throwable) {
             // If Visualizer cannot be initialized (e.g. permission or device restriction), ensure cleanup
+            Timber.e(e, "Failed to start audio visualizer listening")
             stop()
             throw e
         }
@@ -60,8 +79,45 @@ class VisualizerController(
      */
     @Synchronized
     fun stop() {
+        Timber.d("Stopping audio visualizer listening")
+
+        // Stop the logging coroutine
+        loggingJob?.cancel()
+        loggingJob = null
+
         visualizer?.enabled = false
         visualizer?.release()
         visualizer = null
+
+        // Clear latest data
+        latestWaveform = null
+        latestFft = null
+
+        Timber.i("Audio visualizer listening stopped")
+    }
+
+    /**
+     * Starts a coroutine that logs raw data samples every 1 second.
+     */
+    private fun startDataLogging() {
+        loggingJob?.cancel() // Cancel any existing logging job
+        loggingJob = coroutineScope.launch {
+            while (isActive) {
+                delay(1000) // Wait for 1 second
+
+                val waveform = latestWaveform
+                val fft = latestFft
+
+                if (waveform != null && fft != null) {
+                    // Log sample of raw data (first few bytes to avoid too much log spam)
+                    val waveformSample = waveform.take(8).joinToString(", ") { it.toString() }
+                    val fftSample = fft.take(8).joinToString(", ") { it.toString() }
+
+                    Timber.d("Raw data sample - Waveform {size: ${waveform.size}, sample: [$waveformSample...]}, FFT {size: {${fft.size}}, sample: [$fftSample...]}")
+                } else {
+                    Timber.d("Raw data sample - No data available yet")
+                }
+            }
+        }
     }
 }