小任班长的博客 2020年
谷歌要求Android 11 必须支持无缝更新
近日，谷歌工程师提交了强制要求 Android 11 支持无缝更新的 commit，这个自 Android 7.0 版本就有的功能将在未来的 11.0 版本中成为规范化约束手机厂商的一道新规。
移动操作系统的版本更新一直是个极其影响用户体验的问题，早期的 Android 版本更新甚至存在相当大的“翻车”风险，当年的众多刷机论坛留下了不少系统更新变板砖的故事。为了提升 Android 操作系统版本更新的用户体验与停机时长，谷歌做了很多工作，其中一大重点就是在 Android 7.0 Nougat 中引入的“无缝更新”功能。
而在近日，谷歌工程师提交的一个名为“Require Virtual A/B on R launches” 的 commit 显示，Android 11 版本中将强制要求必须支持无缝更新。
简单来说，无缝更新功能的意义在于缩短由操作系统更新带来的停机时间，并提供一种在更新翻车情况下的恢复机制。
一般而言，在 Android 系统上，手机在 OS 更新时会启动进入恢复状态，并且可能会停留在“安装系统更新”屏幕上长达 25 分钟。这将导致相当长的停机时间，在此期间，你无法使用任何 App，查看短信或接听电话，成为实际意义上的一块“板砖”。
无缝更新利用了两个系统分区去减少停机时间。这两个系统分区被称为 A 和 B，是彼此的拷贝。一个上线一个离线，应用更新到离线的分区。当离线的分区完成更新，系统会要求重启，然后切换活跃的分区。
无缝更新还有另一个好处，如果更新过程出现问题，其中一个分区无法启动，可以将另一个分区作为备份，如果启动没有完成，仍旧可以切换到旧版本中。此后系统会继续尝试下载新的 OS 更新包，然后重新升级，而不像以前那样升级失败就变成板砖。
当然，无缝更新也存在一些问题：比如两个系统分区要占用更多存储空间；低端机可能存在性能问题，无法兼容等。
在 Android 11 中，我们将继续为用户带来更多创新技术，并保持对隐私性和安全性的高度关注。我们不仅增加了多项用于管理敏感数据和文件访问的新功能、同时还强化了某些关键区域，从而保持操作系统的良好弹性和安全性。
具体而言，重大更新包括：
5G 体验
动态计量 API，检查当前网络连接的性能水平；如果尚有充足余量，则能选择更高的素材分辨率或质量，从而强化应用的使用体验。
带宽估算 API，让手机更加智能地估算当前网络的上行 / 下行带宽，而不需要手机再进行重复的测试来获取数据。
屏幕适配优化
手机厂商的硬件屏幕开始变得千奇百怪：瀑布屏、挖孔屏等各种异形屏、曲面屏大行其道，谷歌团队将从软件适配层面更好地对这些屏幕做相应优化。
分区存储开始推进
这个 Android 平台的“沙箱”开始再次推进，对应用的存储空间访问行为进行有效管制，使内存存储空间保持干净整洁。
敏感权限授权新规
对于敏感数据如位置、麦克风、摄像头等，用户可以通过一次性授权方式将其临时开启。这样在用户退出以后，后台运行软件也无法授权偷跑。
除此以外，还有深色主题、神经网络、人机对话、兼容更新等多项重大改进，Android 11 的使用体验与隐私安全或许将成为一个新的里程碑。而随着谷歌越来越强硬地对手机厂商提出规则约束，这也能在一定程度上规范化各种基于 Android 内核魔改的 ROM，保护用户权益。
微信PC版本 2.9.0正式发布 支持拖拽消息 语音自动转文字 附地址
主要更新内容如下：
在 Windows 7 及以上系统新增小程序面板，可以查看最近使用和我的小程序
聊天中可以引用更多类型的消息
聊天中可以拖拽消息，以转发到其他聊天或保存到电脑
可以设置聊天中的语音消息自动转为文字
可以设置收到的文件是否自动下载
官网下载地址：
永久免费 国产OS系统深度Deepin v20 beta正式发布
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Zhong Nanshan's 12 latest judgments on the epidemic, and found some effective drugs
1.It's not time to remove the mask
Now is not the time to remove the mask. The situation at home and abroad is now very different. China has entered the second stage of the epidemic due to very decisive measures, while some other major countries are still in the first stage of the outbreak and are still climbing upwards. This means that the probability of person-to-person transmission is very high, and the number of confirmed cases is increasing very quickly. Wearing a mask is still a very important means of self-protection, and it is too early to propose not to wear it. However, in areas where the epidemic is not serious, places with few people or empty places are not necessarily worn.
2.Wuhan has passed the level, but there is still the next level
When the epidemic broke out, the central government took decisive action to control and control the urban traffic in Wuhan. It was very successful to adopt mass prevention and control measures elsewhere. In the history of epidemic prevention and control, this is also a feat.
There are still two tests ahead. One is how to control and resume work at the same time, and the other is the "external defense input" off. At present, foreign countries are still at the peak of outbreaks. Some large coastal cities in China, which have close exchanges with foreign countries, are easily involved and some outbreaks occur. They also need to pass various prevention and control measures.
3.The possibility of overseas outbreaks causing a second outbreak in China is small
Will overseas imported cases continue to appear, will it cause community transmission and trigger a second outbreak in China?
This is actually two problems, one is whether the imported cases have spread, and the other is whether there will be an outbreak during the spread. The risk of transmission of imported cases abroad must exist, especially in cases where the nucleic acid test is positive or the symptoms of infection have occurred, the infection is relatively strong and will cause the virus to spread.
Will it cause an outbreak? It is estimated that the possibility is relatively small. Group prevention and control in our country has been sinking into the community, and community residents have a strong sense of self-protection, such as wearing masks and keeping in touch with people. Once someone has symptoms such as fever, they can quickly report or receive a diagnosis, and isolation. Overall, there is definitely a danger of community transmission, but the second wave of outbreaks in China is very unlikely.
4.It is too early to talk about the turning point of the global epidemic
From a global perspective, the epicenter of the original epidemic was in Europe, especially Spain and Italy, and now includes Germany, France, and the United Kingdom. The biggest problem is the United States, which has been increasing at a rate of 10,000 or 20,000 cases per day in the most recent week. Therefore, it is still early to see the turning point.
At the inflection point, it depends on whether the government can intervene forcefully. There are many unpredictable factors in other countries, so it is much harder for me to predict the global inflection point than it is to predict China. As this situation continues to develop, I am afraid it will take another two weeks.
5.The proportion of asymptomatic infections in China will not be very large
Asymptomatic infections do not occur out of thin air, and usually appear in two groups: one is in areas where the epidemic is relatively serious, but people who have not yet shown symptoms but may have been infected. The other is close contacts of confirmed cases. Their proportion is still relatively small.
There are also two concepts for asymptomatic infections. One is that there is no symptoms at first, but then it will gradually develop to be symptomatic. This type is definitely infectious. The other type is what we discovered recently. During quite a long period of observation, there is no symptom, but the nucleic acid test is positive. We are studying this type of infectiousness. However, according to the characteristics of the new coronavirus, once the symptoms appear, the infectivity is relatively strong, so it is right to isolate them and observe them as a group of people.
6.Most patients in Fuyang are not infected
The so-called "Fuyang" is mostly a fragment of nucleic acid rather than the virus itself. Two conditions need to be noted. The first is whether the patient himself relapses. If the patient produces a strong antibody, it will generally not be infected again. As for whether the patients of Fuyang will be transmitted to others, specific analysis is needed. Generally, nucleic acid fragments are not contagious. Some scholars have cultured pharyngeal swabs and secretions of patients in Fuyang, but no virus has been cultured. A
There is also a rare case where the patient has many basic diseases originally, but the symptoms have improved and they have not fully recovered. These patients cannot be ruled out as infectious.
Overall, I do n’t worry too much about patients with reinfection.
7.There is insufficient evidence for the flu of new coronary pneumonia
Will New Coronary Pneumonia last as long as the flu?
This is a school of thought. As of now, there is insufficient evidence. Unless the virus spreads such a pattern: its infectivity is still strong, but the case fatality rate is getting lower and lower, in this case, there is a possibility of long-term existence. We now need to make a long-term observation and grasp sufficient data and cases before we can draw a view like this. In the current situation, I don't think this prediction will be realistic.
8.Inter-animal communication is now too early to draw conclusions
It remains to be seen whether some animals, such as dogs, cats and tigers, have tested positive for nucleic acids, whether they are caused by pollution or infected. Some animals already carry some viruses, which may not be symptomatic and may not be contagious. It is now believed that the new coronavirus in these animals can infect both humans and animals, and can cause disease. The conclusion is too early, and I generally do n’t look at it that way.
9.There are no special medicines, but some effective medicines are found
Some of the drugs we are currently experimenting with, such as chloroquine, the results of the experiment are definitely valid, we are summarizing and may be published soon. There are also some traditional Chinese medicines, such as Lianhua Qingwen. Not only did we perform in vitro experiments, but we also found in P3 laboratory (that is, the third-level laboratory of biosafety protection, editor's note) that its antiviral effect is not strong, but it is anti-inflammatory The performance is outstanding, and the relevant experimental results will be published soon. In addition, there is the Chinese medicine Xuebijing. Its main components include safflower, salvia, red peony, etc., which are used for promoting blood circulation and removing blood stasis. It is also effective for the treatment of severe patients.
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10.the vaccine will not be listed soon
Vaccines are really important to really end the epidemic. Now countries are developing at the fastest rate. But I don't think the vaccine can be made in three or four months. In addition, according to the experience of fighting against SARS, removing the intermediate host can also stop the spread of the epidemic. At present, we do not yet know what the spread chain of the new coronavirus is, and it is also important to cut it off after figuring it out.
Putting all hope on the vaccine, regardless of other methods, is negative. Moreover, after the vaccine comes out, it is impossible to be perfect at a time. The susceptible people can be vaccinated, but it is not necessary for everyone to be vaccinated.
11.Mass immunization is the most negative approach
The most negative way to deal with the epidemic is the so-called mass immunization. This was the idea more than a hundred years ago. At that time, humans had no choice but to let the virus infect. People who survived the infection naturally obtained antibodies. I do not agree with this method to deal with the new coronavirus now. Over the past 100 years, mankind has made great progress, there are many ways to prevent it, no need to use natural immunization, group immunization.
12.The most worthwhile experience shared by China in the fight against epidemic disease is its execution
China's war epidemic has mainly taken two major measures: one is to block outbreak areas and block the spread; the second is grassroots group prevention and control, that is, joint prevention and control. Now there are two cores of prevention and control, the first is to maintain distance, and the second is to wear a mask.
Therefore, the most shareable experience is execution. The medical level and technical strength of many countries are much higher than those of China. The reason why they were caught off guard by the epidemic was because they did not have the ideological preparation and did not take decisive measures to cause many front-line medical staff to become infected. It is easy to get out of control.
