参考链接
月度归档：2018年12月
fs文件操作
Dart语法学习
单例模式
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class Manager { // 工厂模式 factory Manager() =>_getInstance() static Manager get instance => _getInstance(); static Manager _instance; Manager._internal() { // 初始化 } static Manager _getInstance() { if (_instance == null) { _instance = new Manager._internal(); } return _instance; } } |
调用
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Manager manager = new Manager(); Manager manager2 = Manager.instance; |
flutter手势
flutter开发mac app
Problem with the SSL CA cert (path? access rights?)
升级wordpress发现502，于是查找接近方式，有人提出执行如下命令
mv /usr/lib64/libsqlite3.so.0.8.6 /usr/lib64/libsqlite3.so.0.8.6.bak
当时并未发现异常，但是当需要git pull时，发现提示如下
fatal: unable to access ‘xxxx’: Problem with the SSL CA cert (path? access rights?)
尝试各种解决方式，当尝试如下方法时
yum update -y nss curl libcurl
发现提示
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
No module named sqlite
Please install a package which provides this module, or
verify that the module is installed correctly.
It’s possible that the above module doesn’t match the
current version of Python, which is:
2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)]
If you cannot solve this problem yourself, please go to
the yum faq at:
于是怀疑是之前操作引起的问题，恢复后可以pull
阿里云服务器维护日常
查看硬盘剩余空间
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df -hl |
- 文件系统 Filesystem
- 容量 Size
- 已用 Used
- 可用 Avail
- 已用% Use%
- 挂载点 Mounted on
flutter之bloc
flutter主题
android 如何获取网络视频的第一帧
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String pathvideo = "你的网络视频路径"; //加载视频第一帧 Bitmap bitmap = getNetVideoBitmap(pathvideo); holder.img.setImageBitmap(bitmap);//对应的ImageView赋值图片 public static Bitmap getNetVideoBitmap(String videoUrl) { Bitmap bitmap = null; MediaMetadataRetriever retriever = new MediaMetadataRetriever(); try { //根据url获取缩略图 retriever.setDataSource(videoUrl, new HashMap()); //获得第一帧图片 bitmap = retriever.getFrameAtTime(); } catch (IllegalArgumentException e) { e.printStackTrace(); } finally { retriever.release(); } return bitmap; } |
参考链接