首页 \ 问答 \ 如果用户在其设备中禁用了Chrome浏览器，则Chrome自定义标签会崩溃(Chrome custom tab crashes if chrome browser is disabled by the user in his device)

如果用户在其设备中禁用了Chrome浏览器，则Chrome自定义标签会崩溃(Chrome custom tab crashes if chrome browser is disabled by the user in his device)

 我试图在chrome custom tab打开pdf file ，使用此代码可以正常工作  
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
CustomTabsIntent customTabsIntent = builder.build();
customTabsIntent.launchUrl(this, Uri.parse("https://docs.google.com/viewerng/viewer?url=" +pdflink));
 
 但问题是，如果用户已从应用程序设置中禁用了Chrome，并且没有其他浏览器崩溃。 那么如果禁用它，我如何在chrome自定义选项卡中打开它。  
 提前致谢。  
 这是logcat中出现的异常。  
 Caused by: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=https://docs.google.com/... (has extras) }

I am trying to open pdf file in chrome custom tab, it works fine by using this code 
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
CustomTabsIntent customTabsIntent = builder.build();
customTabsIntent.launchUrl(this, Uri.parse("https://docs.google.com/viewerng/viewer?url=" +pdflink));
 
But the problem is, if the user have disabled chrome from app settings and there is no other browser it crashes. So how can i open it in the chrome custom tab if it is disabled. 
Thanks in advance. 
this is the exception that is showing up in the logcat. 
 Caused by: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=https://docs.google.com/... (has extras) }

原文：https://stackoverflow.com/questions/45561595

更新时间：2023-10-27 16:10

最满意答案

 “算法”的最常见定义不允许算法指定图灵机不能执行的计算。 假设您正在使用其中一个传统定义，  
 不可以。所有图灵机都可以用图灵完整语言指定（模数资源限制）。 这些确定性语言大体上是图灵完备的。  
 也就是说，您可能无法编写某些类型的软件（而不是算法），例如设备驱动程序，因硬件接口原因需要处理易失性内存 ，而且出于安全原因，特殊用途软件有时会出于不可预测的行为，例如加密生成强键，盐或non。 密码学上强大的PRNG是确定性的，但生成密钥的最佳方法是通过真正随机性的来源。  
 例如，最小的JavaScript（并且只有JavaScript;没有DOM绑定）解释器减去Math.random和Date.now以及一些其他非确定性来源将有资格作为确定性，因为它的事件循环并发模型指定了交错。 JavaScript是一种图灵完备语言，可以表达像Java这样的语言可以使用的任何算法。 您可以在该基本JavaScript中包含类似setTimeout的工具，该工具仅允许0作为延迟，以允许确定性延迟评估，从而提供切片时间的丰富确定性方法。  
 Verilog是另一种事件循环并发语言，具有图灵完备的富有表现力的确定性子集。  
 Joe-E是图灵完整的Java子集，旨在提供确定性保证，作为提供“Java中可验证的功能纯度”的一部分，尽管它试图支持Java的线程模型。  
 除了事件循环并发之外，还有各种各样的actor模型提供了确定性，正如什么是*确定性并发*所讨论的那样？ 

Most common definitions of "algorithm" do not allow an algorithm to specify a computation that cannot be performed by a Turing machine. Assuming you are using one of those conventional definitions, 
No. All Turing machines can be specified (modulo resource limits) in a Turing complete language. These deterministic languages are Turing complete by and large. 
That said, you may not be able to write some kinds of software (not algorithms) like device drivers that need to deal well with volatile memory for hardware interface reasons and special purpose software sometimes wants to behave unpredictably for security reasons, e.g. generation of cryptographically strong keys, salts, or nonces. There are cryptographically strong PRNGs that are deterministic, but the best way to generate a key is via a source of true randomness. 
As an example, a minimal JavaScript (and only JavaScript; no DOM bindings) interpreter minus Math.random and Date.now and a few other sources of non-determinism would qualify as deterministic since its event-loop concurrency model specifies the interleaving. JavaScript is a Turing-complete language that can express any algorithm that a language like Java can. You can include in that basic JavaScript a facility like setTimeout that only allows 0 as the delay to allow deterministic delayed evaluation providing a rich deterministic way to slice time. 
Verilog is another event-loop concurrent language that has a Turing-complete richly expressive deterministic subset. 
Joe-E is a Turing complete subset of Java that aims to provide determinism guarantees as part of providing "Verifiable Functional Purity in Java" though it punts on trying to support Java's threading model. 
Besides event-loop concurrency, there are varieties of the actor model that provide determinism as discussed at What's *Deterministic concurrency*?

如果用户在其设备中禁用了Chrome浏览器，则Chrome自定义标签会崩溃(Chrome custom tab crashes if chrome browser is disabled by the user in his device)

最满意答案

相关问答

协议缓冲区序列化输出是完全确定的吗？(Is protocol buffer serialization output fully deterministic?)[2023-08-08]

非确定性函数(Non Deterministic Function)[2022-09-24]

scalacheck非确定性方法是否有问题？(Is scalacheck non-deterministic approach problematic?)[2022-05-17]

“确定性用户定义函数可以以确定性方式使用”是什么意思？(What does it mean by “Non-deterministic User-Defined functions can be used in a deterministic manner”?)[2022-02-21]

找到一个反向确定的非确定性CFL(Find a non-deterministic CFL whose reverse is deterministic)[2021-11-16]

确定性函数是非确定性的[重复](Deterministic Function is Non-Deterministic [duplicate])[2023-08-13]

确定性语言的适用性(Applicability of Deterministic Languages)[2023-02-18]

是Mysql NOW（）DETERMINISTIC(Is Mysql NOW() DETERMINISTIC)[2023-06-11]

非线性，非确定性和非确定性CFL的例子？(Example of Non-Linear, UnAmbiguous and Non-Deterministic CFL?)[2022-12-20]

并行编程语言看起来确定性？(Parallel programming languages which look deterministic?)[2023-09-06]

相关文章

最新问答