Ir al contenido principal

Android - Basic Steps (Thread)

Thread

  • UI Thread - Is the main thread
  • UI Toolkit is not thread-safe

Methods

The following methods allows to  run in the UI Thread 
  • View.post(Runnable r)
  • Activity.runOnUiThread(Runnable r)

AsyncTask

Manage the Backgroud Thread & UI Thread
Used for relative short tasks that lasting few seconds

  • Background Thread
    • Performs work
    • Indicate progress
  • UI Thread
    • Does Setup
    • Publishes intermediate progress
    • Uses Results

Workflow

  • onPreExecute()
    • Run in UI Thread before doInBackground()
    • Do the setup
  • doInBackground()
    • Do the work in the background
    • Return the result in a Result object
  • pulishProgress()
    • This method may be invoked
  • onProgressUpdate()
    • If pulishProgress() is invoked then this method continue
    • Runs in the UI Thread
  • onPostExecute
    • Runs after doInBackground()


Handler

  • Handle two threads of any kind
  • One thread can hand off work to another thread by messages & posting runnables to handler associated with the second thread

Elements

  • Runnable 
    • Contains an instance of the Runnable instance
    • Sender implements response
  • Message
    • Contains
      • Message code
      • Object & Integer arguments








Comentarios

Publicar un comentario

Entradas populares de este blog

C# Using tabs

To use tabs in C# use the TabContainer element from AjaxControlToolkit Include AjaxControlToolkit  Include in the Web.config file, inside the tag <system.web> the following code  <pages>       <controls>         <add tagPrefix="ajaxCTK" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>       </controls>     </pages>   Include TabContainer element First  include TabContainer element that is the section where all the tabs will be displayed. <ajaxCTK:TabContainer ID="TabContainerUpdate" runat="server"                 Height="800"                 CssClass="ajax__tab_style"> </ajaxCTK:TabContainer> Second per each tab include the following code corresponding to each ...
Publicar un comentario
Leer más

Rails - Basic Steps III

pValidations Validations are a type of ActiveRecord Validations are defined in our models Implement Validations Go to   root_app/app/models Open files  *.rb for each model Mandatory field validates_presence_of   :field Ex:   validates_presence_of    :title Classes The basic syntax is class MyClass        @global_variable                def my_method              @method_variable        end end Create an instance myInstance = MyClass.new Invoke a mehod mc.my_method class() method returns the type of the object In Ruby, last character of method define the behavior If ends with a question -> return a boolean value If ends with an exclamation -> change the state of the object Getter / Setter method def global_variable       return @global_variable end ...
Publicar un comentario
Leer más

Python create package

Create a root folder Create a sub-folder "example_pkg" that contains the funtionallity packaging_tutorial/ example_pkg/ __init__.py In the root folder create the following structure  packaging_tutorial/ example_pkg/ __init__.py tests/ setup.py LICENSE README.md in the setup.py contains the configuration of the packages your package is found by find_packages() import setuptools with open ( "README.md" , "r" ) as fh : long_description = fh . read () setuptools . setup ( name = "example-pkg-YOUR-USERNAME-HERE" , # Replace with your own username version = "0.0.1" , author = "Example Author" , author_email = "author@example.com" , description = "A small example package" , long_description = long_description , long_description_content_type = "text/markdown" , url = "https://github.com/pypa/sam...
Publicar un comentario
Leer más