相机预览的有效模糊

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;
    private Bitmap mBlurredBitmap;

    public CameraPreview(Context context, Camera camera) {
        super(context);
        mCamera = camera;
        mHolder = getHolder();
        mHolder.addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // Handle surface changes if needed
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        mCamera.release();
    }

    public void applyBlur(Bitmap originalBitmap) {
        if (mBlurredBitmap == null || mBlurredBitmap.getWidth() != originalBitmap.getWidth() || mBlurredBitmap.getHeight() != originalBitmap.getHeight()) {
            mBlurredBitmap = Bitmap.createBitmap(originalBitmap.getWidth(), originalBitmap.getHeight(), Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(mBlurredBitmap);
        Paint paint = new Paint();
        paint.setFlags(Paint.FILTER_BITMAP_FLAG);
        canvas.drawBitmap(originalBitmap, 0, 0, paint);

        // Apply blur effect using RenderScript or other blur library
        // For simplicity, we use a simple box filter here
        int radius = 10;
        for (int x = -radius; x <= radius; x++) {
            for (int y = -radius; y <= radius; y++) {
                if (x * x + y * y <= radius * radius) {
                    canvas.drawBitmap(originalBitmap, x, y, paint);
                }
            }
        }

        mCamera.setPreviewDisplay(mHolder);
        mCamera.startPreview();
    }
}