/**
 * 文件工具类
 */
public class FileUtil {

    /**
     * 根据Uri返回文件绝对路径
     * 兼容了file:///开头的 和 content://开头的情况
     */
    public static String getRealFilePathFromUri(final Context context, final Uri uri) {
        if (null == uri) return null;
        final String scheme = uri.getScheme();
        String data = null;
        if (scheme == null) {
            data = uri.getPath();
        }
        else if (ContentResolver.SCHEME_FILE.equalsIgnoreCase(scheme)) {
            data = uri.getPath();
        } else if (ContentResolver.SCHEME_CONTENT.equalsIgnoreCase(scheme)) {
            Cursor cursor = context.getContentResolver().query(uri, new String[]{MediaStore.Images.ImageColumns.DATA}, null, null, null);
            if (null != cursor) {
                if (cursor.moveToFirst()) {
                    int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
                    if (index > -1) {
                        data = cursor.getString(index);
                    }
                }
                cursor.close();
            }
        }
        return data;
    }

    /**
     * 检查文件是否存在
     */
    public static String checkDirPath(String dirPath) {
        if (TextUtils.isEmpty(dirPath)) {
            return "";
        }
        File dir = new File(dirPath);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        return dirPath;
    }
}