Repurpose repo with new samples #108
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These new samples demonstrate Android Camera & Media user experiences that leverage AI. Please see the old-media-samples tag in this repo to find the previous samples that were hosted here.
Summary of ChangesHello @SigmanZero, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request represents a significant update to the repository's sample content. It systematically removes outdated media-related samples and introduces a suite of new, modern examples built with CameraX and Jetpack Compose. These new samples demonstrate advanced functionalities such as real-time green screen effects using ML Kit and voice-activated camera controls powered by Firebase AI, providing contemporary and relevant showcases for Android developers. Highlights
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Code Review
This pull request repurposes the repository by removing old media samples and adding three new ones demonstrating CameraX features: a basic app, a green screen effect app, and a voice control app. My review focuses on the new code. I've identified a critical performance issue and a high-severity race condition in the green screen sample due to incorrect threading and state management. I've also pointed out that the voice control sample has its core functionality commented out, rendering it non-functional. Additionally, there's a medium-severity maintainability issue with magic numbers.
| ) | ||
| } else if (effectMode.value == EffectMode.GREEN_SCREEN) { | ||
| imageAnalyzer.setAnalyzer( | ||
| ContextCompat.getMainExecutor(application), |
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The SelfieSegmentationAnalyzer is being run on the main executor. The analyze method performs several heavy operations like bitmap creation and transformations, which can block the main thread and cause UI jank. This analyzer should be run on a background thread. You already have a cameraExecutor which would be suitable for this.
| ContextCompat.getMainExecutor(application), | |
| cameraExecutor, |
| lateinit var mask: Bitmap | ||
| lateinit var bitmap: Bitmap |
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These top-level lateinit var properties are used to share data between the SelfieSegmentationAnalyzer and the OverlayEffect.OnDrawListener. This is not thread-safe and can lead to race conditions, as the analyzer and the draw listener can run on different threads. This can result in tearing, where the bitmap and mask are from different frames.
A better approach is to use a thread-safe mechanism to pass data. For example, you could encapsulate the bitmap and mask in a data class and use an AtomicReference to update and read them atomically.
Example:
// 1. Define a data class
data class SegmentationResult(val bitmap: Bitmap, val mask: Bitmap)
// 2. Replace the lateinit vars with an AtomicReference
private val segmentationResult = AtomicReference<SegmentationResult?>()
// 3. In SelfieSegmentationAnalyzer, at the end of analyze:
segmentationResult.set(SegmentationResult(bitmap, mask))
// 4. In greenScreenEffect.setOnDrawListener:
val result = segmentationResult.get()
if (result != null) {
// ... use result.bitmap and result.mask
}| // val model = Firebase.ai(backend = GenerativeBackend.googleAI()).liveModel( | ||
| // modelName = "gemini-live-2.5-flash-preview", | ||
| // generationConfig = liveGenerationConfig { | ||
| // responseModality = ResponseModality.AUDIO | ||
| // speechConfig = SpeechConfig(voice = Voice("FENRIR")) | ||
| // }, | ||
| // systemInstruction = systemInstruction, | ||
| // tools = listOf(cameraControlTool)) |
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The initialization of the Gemini liveModel is commented out, which makes the voice control feature non-functional. The call to model.connect() in startVoiceControl() is also commented out. Was this intentional? If this sample is meant to demonstrate voice control, this code should be enabled, perhaps with instructions for developers on how to configure their own API key.
| frame.overlayCanvas.drawColor(GraphicsColor.TRANSPARENT, PorterDuff.Mode.CLEAR) | ||
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| // Draw the bitmap and mask, positioning the overlay in the bottom right corner. | ||
| val rect = Rect(4*bitmap.width/3, bitmap.height/2, 7 * bitmap.width/3, 3*bitmap.height/2) |
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The coordinates for positioning the overlay are calculated using magic numbers (4, 3, 7, 2). This makes the code harder to understand and maintain. Consider extracting these values into named constants to clarify their purpose, for example, by defining the overlay's relative position and size.
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