七牛上传图片 open failed: EACCES (Permission denied)

提示 open failed: EACCES (Permission denied)

其实这是Android6.0以后运行时权限的问题

解决办法：

if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //申请WRITE_EXTERNAL_STORAGE权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    WRITE_EXTERNAL_STORAGE_REQUEST_CODE);
        }

然后咱根据回调进行操作