软工划水日报-模型导入文件utils 4/29

public class Utils {
    // 复制莫模型文件到缓存目录
    public static void copyFileFromAsset(Context context, String oldPath, String newPath) {
        try {
            // 预测模型文件在assets中的位置
            String[] fileNames = context.getAssets().list(oldPath);
            if (fileNames.length > 0) {
                // directory
                File file = new File(newPath);
                if (!file.exists()) {
                    file.mkdirs();
                }
                // copy recursivelyC
                for (String fileName : fileNames) {
                    copyFileFromAsset(context, oldPath + "/" + fileName, newPath + "/" + fileName);
                }
            } else {
                // file
                File file = new File(newPath);
                // if file exists will never copy
                if (file.exists()) {
                    return;
                }

                // copy file to new path
                InputStream is = context.getAssets().open(oldPath);
                FileOutputStream fos = new FileOutputStream(file);
                byte[] buffer = new byte[1024];
                int byteCount;
                while ((byteCount = is.read(buffer)) != -1) {
                    fos.write(buffer, 0, byteCount);
                }
                fos.flush();
                is.close();
                fos.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    // start camera
    public static Uri start_camera(Activity activity, int requestCode) {
        Uri imageUri;
        // save image in cache path
        File outputImage = new File(activity.getExternalCacheDir(), "out_image.jpg");
        try {
            if (outputImage.exists()) {
                outputImage.delete();
            }
            outputImage.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        if (Build.VERSION.SDK_INT >= 24) {
            // compatible with Android 7.0 or over
            imageUri = FileProvider.getUriForFile(activity,"com.example.ironfarm.fileprovider", outputImage);
        } else {
            imageUri = Uri.fromFile(outputImage);
        }
        // set system camera Action
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // set save photo path
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
        // set photo quality, min is 0, max is 1
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
        activity.startActivityForResult(intent, requestCode);
        return imageUri;
    }
}

通过这个类可以将模型推进缓存