小编fra*_*ess的帖子

Improve Large ListView Adapter smooth scroll, sometimes jerky

I'm trying to see what is making my listview jerk sometimes when scroll, at times it's bad especially when the application first launches.

All the conditions I have are necessary, unless there is something I don't know(highly likely). I'm not running certain tasks on a seperate thread because they are dependent on the data I receive from the backend(I'm coding both, so backend suggestions are welcome as well). Product is in beta but really need to make this a slightly …

java performance android listview android-layout

13
推荐指数
2
解决办法
905
查看次数

Rails资产没有预编译,css在生产中看起来不同

在开发模式下我的rails应用程序工作和看起来完全符合我的要求,但在生产中它在chrome和safari上看起来不同,在safari中徽标图像加载但不是字体,在chrome中加载字体而不是图像加上输入字段有点长,并且在chrome中不对齐,但在开发模式下,它们在chrome中看起来都很棒

我一直在弄乱这个并且删除了公共/资产几次

rake assets:precompile RAILS_ENV=production 
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没有成功,预编译没有错误

配置/ application.rb中:

 # Settings in config/environments/* take precedence over those specified here.
 # Application configuration should go into files in config/initializers
 # -- all .rb files in that directory are automatically loaded.
 config.assets.paths << "#{Rails.root}/assets/fonts"
 config.assets.paths << "#{Rails.root}/assets/images"
 config.assets.paths << Rails.root.join("app", "assets", "fonts")
 config.assets.precompile += %w( .svg .eot .woff .ttf )


# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a …
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css assets ruby-on-rails ruby-on-rails-4

11
推荐指数
1
解决办法
4377
查看次数

itoa()c实现int min下溢

我正在针对我的itoa()函数运行一些测试用例但是继续进行

did not allocate memory for the int min value
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我正在检查,但这是我在这里缺少的东西,它是什么?

char *ft_itoa(int x) {
    char *s;
    size_t len;
    long int n;

    n = x;
    if (x == -2147483648)
        return (ft_strdup("-2147483648"));

    len = ft_intlen(n) + 1;
    if (!(s = (char*)malloc(sizeof(char) * len)))
        return (NULL);

    if (n == 0)
        s[0] = '0';

    if (n < 0) {
        s[0] = '-';
        n = -n;
    }
    s[len - 1] = '\0';
    while (n) {
        len--;
        s[len - 1] = (n % 10) + …
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c int overflow itoa

10
推荐指数
1
解决办法
1356
查看次数

使用Alamofire从iOS上传PHP

我正在尝试将3个图像从iOS上传到我的PHP服务.由于某种原因,文件夹在发布后仍然为空,但其余数据通过并持久存储到mysql中.

我的iOS代码:

Alamofire.upload(.POST, urlString, multipartFormData: {
            multipartFormData in

            if (firstPhoto != nil) {
                if  let firstImageData = UIImageJPEGRepresentation(firstImage!, 0.6) {
                    print("uploading image");
                    multipartFormData.appendBodyPart(data: firstImageData, name: "firstImage", fileName: "firstImage.png", mimeType: "image/png")
                }
            }

            if (secondPhoto != nil) {
                if  let secondImageData = UIImageJPEGRepresentation(secondImage!, 0.6) {
                    print("uploading image");
                    multipartFormData.appendBodyPart(data: secondImageData, name: "secondImage", fileName: "secondImage.png", mimeType: "image/png")
                }
            }

            if (thirdPhoto != nil) {
                if  let thirdImageData = UIImageJPEGRepresentation(thirdImage!, 0.6) {
                    print("uploading image");
                    multipartFormData.appendBodyPart(data: thirdImageData, name: "thirdImage", fileName: "thirdImage.png", mimeType: "image/png")
                }
            } …
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php file-upload ios swift alamofire

9
推荐指数
1
解决办法
2045
查看次数

使用Spark Java通过http流式传输视频文件

我正在尝试将视频文件流过静止,我正在尝试像这样实现类似于Jersey的东西:

      ResponseBuilder builder = Response.ok(out.toByteArray());
      builder.header("Content-Disposition", "attachment; filename=" + fields.get("filename"));
      response = builder.build();
    } else {
      response = Response.status(404).
          entity(" Unable to get file with ID: " + id).
          type("text/plain").
          build();
    }

    return response;
  }
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这是我的文件上传和下载/流媒体(下载半工作,文件大小已损坏):

我真的需要帮助这个人,谢谢

UPDATE

改变:

ByteArrayOutputStream out =  new ByteArrayOutputStream();
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至:

ServletOutputStream out = res.raw().getOutputStream();
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更新2 好的,我终于开始工作了,视频在浏览器中播放,但现在得到一个Jetty io.EofException,我关闭了流,但仍然必须简单.

以下是前后:

并从浏览器下载文件,但如何直接在浏览器中流式传输?

之前(没工作)

    //download a video/ trying to stream it right in the browser if possible
    get("/post/:id", (req, res ) -> {

            res.raw().setContentType("application/octet-stream");

            String id = req.params(":id"); …
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java rest jersey mime-types spark-java

5
推荐指数
1
解决办法
2676
查看次数

在rails中显示路由错误的404页面

我试图在rails中呈现集成的404页面作为例外.我试过这个,但仍然得到路由错误页面:

posts_controller.rb

def destroy
if current_user.username == @post.email 
@post.destroy
respond_to do |format|
  format.html { redirect_to posts_url }
  format.json { head :no_content }
end
else
  not_found
end
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application_controller.rb

 def not_found
  raise ActionController::RoutingError.new('Not Found')
end 
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的routes.rb

 Booklist::Application.routes.draw do
 get "pages/faq"
 get "pages/about"
 devise_for :users
 resources :posts

 root 'posts#index'
 end
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视图:

<% if current_user.username == post.email %>
  <font color="red">This is your post! Feel free to edit or delete it. ->  </font>
    <%= link_to 'Edit', edit_post_path(post) %>
    <%= link_to 'Destroy', post, method: :delete, data: …
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ruby ruby-on-rails rails-routing ruby-on-rails-4

2
推荐指数
1
解决办法
6002
查看次数

rails mailboxer undefined方法`mailboxer_email'

我正在使用邮箱gem,我可以发送和接收来自同一用户的消息(自己)dexter可以发送消息到dexter,但是当我以dexter2登录并向dexter发送消息时,我得到未定义的方法错误,当我点击后退按钮并刷新对话,消息在那里,所以消息正在发送,但我一直在收到

undefined method 'mailboxer_email" for #<User:0x007f6ed0907040>
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messages_controller:

class MessagesController < ApplicationController


 def new
   @user = User.find_by_username(params[:user])
@message = current_user.messages.new
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结束

# POST /message/create
def create
@recipient = User.find_by_username(params[:user])
current_user.send_message(@recipient, params[:body], params[:subject])
flash[:notice] = "Message has been sent!"
redirect_to :conversations
end

end
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交谈/ show.html.erb

<%= conversation.subject %>

A conversation with
<% conversation.participants.each do |participant| %>
 <% if participant != current_user %>
  <%= participant.username%>
 <% end %>
<% end %>
<%= content_tag_for(:li, conversation.receipts_for(current_user)) do |receipt| %>
 <% message = receipt.message %>
 <%= …
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ruby ruby-on-rails ruby-on-rails-4 mailboxer

2
推荐指数
1
解决办法
2095
查看次数