Android Best Practices

Performance Optimization

1. Choose the Right Processing Mode

Video Mode (VIDEO)

• Suitable for real-time video streams and live streaming scenarios
• Better performance and faster processing speed
• Recommended for camera preview, video calls, and similar scenarios

Image Mode (IMAGE)

• Suitable for single image processing
• Higher quality and better effects
• Recommended for photo editing and image beautification scenarios

// Real-time video processing
input.type = ImageFrame.FrameType.VIDEO;
ImageFrame output = engine.processImage(input);

// High-quality image processing
input.type = ImageFrame.FrameType.IMAGE;
ImageFrame output = engine.processImage(input);

2. Parameter Adjustment Recommendations

Beauty Parameter Adjustment Principles

• Start with smaller values to avoid over-beautification
• Recommend reducing parameter values in real-time scenarios for smooth performance
• Static images can have appropriately higher parameter values
• Adjust parameter ranges based on user groups and scenarios

Recommended Parameter Ranges

// Basic beauty parameters (real-time scenarios)
mBeautyEngine.setBeautyParam(BasicParam.SMOOTHING, 0.2f);  // Smoothing
mBeautyEngine.setBeautyParam(BasicParam.WHITENING, 0.1f);  // Whitening
mBeautyEngine.setBeautyParam(BasicParam.ROSINESS, 0.1f);   // Rosiness

// Face reshaping parameters (real-time scenarios)
mBeautyEngine.setBeautyParam(ReshapeParam.FACE_THIN, 0.1f);    // Face thinning
mBeautyEngine.setBeautyParam(ReshapeParam.EYE_SIZE, 0.1f);     // Eye enlargement

3. Memory Optimization

Use Direct Memory Buffers

// Recommended: Use direct memory
ByteBuffer data = ByteBuffer.allocateDirect(width * height * 4);

// Avoid: Use heap memory
ByteBuffer data = ByteBuffer.allocate(width * height * 4);

Release Resources Timely

public class BeautyProcessor {
    private ImageFrame mReusableFrame; // Reusable object
    
    public ImageFrame processImage(byte[] imageData) {
        // Reuse ImageFrame object
        if (mReusableFrame == null) {
            mReusableFrame = ImageFrame.createWithRGBA(data, width, height, stride);
        }
        
        // Process image
        mReusableFrame.type = ImageFrame.FrameType.VIDEO;
        ImageFrame output = mBeautyEngine.processImage(mReusableFrame);
        
        return output;
    }
    
    public void release() {
        if (mReusableFrame != null) {
            mReusableFrame.release();
            mReusableFrame = null;
        }
    }
}

Architecture Design

1. Singleton Pattern for Engine Management

public class BeautyEngineManager {
    private static BeautyEngineManager sInstance;
    private BeautyEffectEngine mEngine;
    private Context mContext;
    
    private BeautyEngineManager(Context context) {
        mContext = context.getApplicationContext();
        initEngine();
    }
    
    public static synchronized BeautyEngineManager getInstance(Context context) {
        if (sInstance == null) {
            sInstance = new BeautyEngineManager(context);
        }
        return sInstance;
    }
    
    private void initEngine() {
        BeautyEffectEngine.EngineConfig config = new BeautyEffectEngine.EngineConfig();
        config.appId = "your_app_id";
        config.appKey = "your_app_key";
        mEngine = new BeautyEffectEngine(mContext, config);
    }
    
    public BeautyEffectEngine getEngine() {
        return mEngine;
    }
    
    public void release() {
        if (mEngine != null) {
            mEngine.release();
            mEngine = null;
        }
        sInstance = null;
    }
}

2. Asynchronous Image Processing

public class AsyncBeautyProcessor {
    private ExecutorService mExecutor;
    private BeautyEffectEngine mEngine;
    
    public AsyncBeautyProcessor() {
        mExecutor = Executors.newSingleThreadExecutor();
    }
    
    public void processImageAsync(ImageFrame input, BeautyCallback callback) {
        mExecutor.execute(() -> {
            try {
                input.type = ImageFrame.FrameType.VIDEO;
                ImageFrame output = mEngine.processImage(input);
                
                // Switch to main thread for callback
                new Handler(Looper.getMainLooper()).post(() -> {
                    callback.onSuccess(output);
                });
            } catch (Exception e) {
                new Handler(Looper.getMainLooper()).post(() -> {
                    callback.onError(e);
                });
            }
        });
    }
    
    public interface BeautyCallback {
        void onSuccess(ImageFrame result);
        void onError(Exception error);
    }
}

Error Handling

1. Comprehensive Error Handling Mechanism

public class RobustBeautyProcessor {
    private BeautyEffectEngine mEngine;
    
    public boolean processImage(ImageFrame input, ImageFrame output) {
        // Parameter validation
        if (mEngine == null) {
            Log.e("BeautyProcessor", "Engine not initialized");
            return false;
        }
        
        if (input == null || !input.isValid()) {
            Log.e("BeautyProcessor", "Invalid input image");
            return false;
        }
        
        try {
            // Process image
            ImageFrame result = mEngine.processImage(input, ProcessMode.VIDEO);
            if (result == null) {
                Log.e("BeautyProcessor", "Failed to process image");
                return false;
            }
            
            // Copy result to output
            copyImageFrame(result, output);
            result.release();
            
            return true;
        } catch (Exception e) {
            Log.e("BeautyProcessor", "Exception during processing", e);
            return false;
        }
    }
    
    private void copyImageFrame(ImageFrame src, ImageFrame dst) {
        // Implement image copying logic
    }
}

2. Retry Mechanism

public class RetryBeautyProcessor {
    private static final int MAX_RETRY_COUNT = 3;
    private static final long RETRY_DELAY_MS = 100;
    
    public ImageFrame processImageWithRetry(ImageFrame input) {
        for (int i = 0; i < MAX_RETRY_COUNT; i++) {
            try {
                ImageFrame result = mBeautyEngine.processImage(input, ProcessMode.VIDEO);
                if (result != null) {
                    return result;
                }
            } catch (Exception e) {
                Log.w("BeautyProcessor", "Attempt " + (i + 1) + " failed", e);
            }
            
            if (i < MAX_RETRY_COUNT - 1) {
                try {
                    Thread.sleep(RETRY_DELAY_MS);
                } catch (InterruptedException e) {
                    Thread.currentThread().interrupt();
                    break;
                }
            }
        }
        
        Log.e("BeautyProcessor", "All retry attempts failed");
        return null;
    }
}

Lifecycle Management

WARNING

The beauty engine requires manual release() to free resources. ImageFrame and other objects also need to call release() after use, otherwise it will cause memory leaks.

1. Activity Lifecycle Handling

public class BeautyActivity extends AppCompatActivity {
    private BeautyEngineManager mBeautyManager;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // Initialize beauty engine
        mBeautyManager = BeautyEngineManager.getInstance(this);
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        // Resume beauty processing
    }
    
    @Override
    protected void onPause() {
        super.onPause();
        // Pause beauty processing
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Release beauty engine (if no longer needed)
        // mBeautyManager.release();
    }
}

2. Fragment Lifecycle Handling

public class BeautyFragment extends Fragment {
    private BeautyEffectEngine mBeautyEngine;
    
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        // Initialize beauty engine
        initBeautyEngine();
    }
    
    @Override
    public void onDetach() {
        super.onDetach();
        // Release beauty engine
        if (mBeautyEngine != null) {
            mBeautyEngine.release();
            mBeautyEngine = null;
        }
    }
}

Performance Monitoring

1. Performance Metrics Monitoring

public class BeautyPerformanceMonitor {
    private long mStartTime;
    private int mFrameCount;
    private long mTotalProcessTime;
    
    public void startFrame() {
        mStartTime = System.currentTimeMillis();
    }
    
    public void endFrame() {
        long processTime = System.currentTimeMillis() - mStartTime;
        mTotalProcessTime += processTime;
        mFrameCount++;
        
        // Calculate average processing time
        if (mFrameCount % 30 == 0) { // Calculate every 30 frames
            long avgTime = mTotalProcessTime / mFrameCount;
            Log.d("BeautyPerformance", "Average process time: " + avgTime + "ms");
            
            // Reset counters
            mTotalProcessTime = 0;
            mFrameCount = 0;
        }
    }
    
    public boolean isPerformanceGood() {
        return mTotalProcessTime / Math.max(mFrameCount, 1) < 33; // 30fps
    }
}

2. Memory Usage Monitoring

public class MemoryMonitor {
    private Runtime mRuntime;
    
    public MemoryMonitor() {
        mRuntime = Runtime.getRuntime();
    }
    
    public void logMemoryUsage(String tag) {
        long totalMemory = mRuntime.totalMemory();
        long freeMemory = mRuntime.freeMemory();
        long usedMemory = totalMemory - freeMemory;
        long maxMemory = mRuntime.maxMemory();
        
        Log.d("MemoryMonitor", tag + " - Used: " + (usedMemory / 1024 / 1024) + "MB, " +
              "Max: " + (maxMemory / 1024 / 1024) + "MB");
    }
    
    public boolean isMemoryLow() {
        long usedMemory = mRuntime.totalMemory() - mRuntime.freeMemory();
        long maxMemory = mRuntime.maxMemory();
        return usedMemory > maxMemory * 0.8; // Over 80% usage
    }
}

Configuration Management

1. Beauty Configuration Management

public class BeautyConfigManager {
    private SharedPreferences mPrefs;
    private static final String PREF_NAME = "beauty_config";
    
    public BeautyConfigManager(Context context) {
        mPrefs = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
    }
    
    public void saveBeautyConfig(BeautyConfig config) {
        SharedPreferences.Editor editor = mPrefs.edit();
        editor.putFloat("smoothing", config.smoothing);
        editor.putFloat("whitening", config.whitening);
        editor.putFloat("face_thin", config.faceThin);
        editor.putBoolean("basic_enabled", config.basicEnabled);
        editor.putBoolean("reshape_enabled", config.reshapeEnabled);
        editor.apply();
    }
    
    public BeautyConfig loadBeautyConfig() {
        BeautyConfig config = new BeautyConfig();
        config.smoothing = mPrefs.getFloat("smoothing", 0.3f);
        config.whitening = mPrefs.getFloat("whitening", 0.2f);
        config.faceThin = mPrefs.getFloat("face_thin", 0.1f);
        config.basicEnabled = mPrefs.getBoolean("basic_enabled", true);
        config.reshapeEnabled = mPrefs.getBoolean("reshape_enabled", false);
        return config;
    }
    
    public static class BeautyConfig {
        public float smoothing = 0.3f;
        public float whitening = 0.2f;
        public float faceThin = 0.1f;
        public boolean basicEnabled = true;
        public boolean reshapeEnabled = false;
    }
}

Testing Recommendations

1. Unit Testing

@Test
public void testBeautyEngineInitialization() {
    BeautyEffectEngine.EngineConfig config = new BeautyEffectEngine.EngineConfig();
    config.appId = "test_app_id";
    config.appKey = "test_app_key";
    
    BeautyEffectEngine engine = new BeautyEffectEngine(mContext, config);
    assertNotNull("Engine should be created", engine);
    
    engine.release();
}

@Test
public void testImageProcessing() {
    // Create test image
    ByteBuffer data = ByteBuffer.allocateDirect(640 * 480 * 4);
    ImageFrame input = ImageFrame.createWithRGBA(data, 640, 480, 640 * 4);
    
    // Process image
    ImageFrame output = mBeautyEngine.processImage(input, ProcessMode.VIDEO);
    
    assertNotNull("Output should not be null", output);
    assertTrue("Output should be valid", output.isValid());
    
    input.release();
    output.release();
}

2. Performance Testing

@Test
public void testPerformance() {
    long startTime = System.currentTimeMillis();
    
    for (int i = 0; i < 100; i++) {
        // Process test image
        processTestImage();
    }
    
    long endTime = System.currentTimeMillis();
    long totalTime = endTime - startTime;
    long avgTime = totalTime / 100;
    
    assertTrue("Average process time should be less than 50ms", avgTime < 50);
}