当我尝试运行'rails server'时,它给我一个错误,说它找不到'jcode',我认为jcode是一个默认的ruby lib.你们有什么线索关于什么事情发生？
/Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/gdata-1.1.1/lib/gdata.rb:21:in `require': no such file to load -- jcode (LoadError)
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/gdata-1.1.1/lib/gdata.rb:21:in `<top (required)>'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/contacts-1.2.4/lib/contacts/gmail.rb:1:in `require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/contacts-1.2.4/lib/contacts/gmail.rb:1:in `<top (required)>'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/contacts-1.2.4/lib/contacts.rb:6:in `require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/contacts-1.2.4/lib/contacts.rb:6:in `<top (required)>'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler/runtime.rb:64:in `require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler/runtime.rb:64:in `block (2 levels) in require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler/runtime.rb:62:in `each'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler/runtime.rb:62:in `block in require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler/runtime.rb:51:in `each'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler/runtime.rb:51:in `require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/bundler-1.0.3/lib/bundler.rb:112:in `require'
from /Users/seanfchan/RubyPractice/gettingContancts/config/application.rb:7:in `<top (required)>'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/railties-3.0.1/lib/rails/commands.rb:28:in `require'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/railties-3.0.1/lib/rails/commands.rb:28:in `block in <top (required)>'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/railties-3.0.1/lib/rails/commands.rb:27:in `tap'
from /Users/seanfchan/.rvm/gems/ruby-1.9.2-p0@global/gems/railties-3.0.1/lib/rails/commands.rb:27:in `<top (required)>'
from script/rails:6:in …我在相应的资源文件夹中创建了一个新的布局文件.同步后,当我尝试引用布局文件,即R.layout.activity_test时,R是一个"未解析的符号".当我尝试在AS中构建时,它失败了.
有趣的是,如果我手动导入R文件并在代码中使用它,当我尝试在命令行上构建时,它可以工作.另一件事是当我尝试使用Java文件中的R访问布局文件时,这也有效.所以我知道R.java正在生成.
我尝试创建一个全新的项目,R可以在Kotlin文件中访问.
这里有什么问题？
我尝试过的事情:
清理然后建成
无效的缓存/重新启动
吹掉.gradle文件夹并重新创建索引
其他信息:
AS v3.0.1
试过Kotlin v1.1.2-4和v1.1.60
Gradle v4.2.1
Gradle Plugin v3.0.0
图像你有一个ImageView，它在一个不移动的层上占据整个屏幕，这个层是恒定的，为什么上层在转换到新片段时会移动，然后你在其顶部的可移动层上有另一个ImageView 。我的问题是是否有办法混合两层？
有没有更好的方法来完成我上面描述的事情？
我今天遇到了一些奇怪的事情.看一下这段代码:
List <Rectangle> test1 = new LinkedList<Rectangle>();
List <Shape> test2 = test1; //Compiler Error;
这当然是假设Rectangle类是Shape的子类.有人可以向我解释为什么这是一个错误？