rajbharath

<link rel="import" href="../core-item/core-item.html">

<polymer-element name="my-element">

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    <style>    
      :host {
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rajbharath

sudo -u postgres psql
ALTER USER postgres PASSWORD 'newPassword'

rajbharath

Let’s see how to install PostgreSQL 9.3 Server and PGAdmin3 on a clean Ubuntu OS in  detail!

    Install dependency
    Open Terminal and execute the following commands:

    sudo apt-get update
    sudo apt-get -y install python-software-properties

    Add PostgreSQL 9.3 repository
    Before installing PostgreSQL 9.3, we have to add the PostgreSQL repository where the packages are located.

rajbharath

Intent
- is a messaging object with in the app components
- used to invoke any component from any other app components
- can carry small amount of information along with that for the invoking component to act upon it

type:
Expicit - when the optional argument which is qualified class name is given to an intent, it becomes the explicit intent
Implicit - when the action, data and mime type, category is given the android OS searches all the other apps intent filters for the given action, data and mime type , category to match the intent to invoke. if there are many options are available then the chooser is given to the user to select the appropriate one.

rajbharath

1. it is used for background proces such as downloading a file.
2. it does not need user interface
3. for writing a service we need to extend the base service class provided by android

it is two kind:
1. service started
2. service bound

lifeCycle:
start service :

rajbharath

1. activity is a screen displayed to the user with the user interface controls
2. an application will consist many activity but atleast one will be main to start with
3. it has following life cycle
oncreate -> onstart/onrestarted -> onresume -> onpause -> onstop -> ondestroy


for more questions explain on life cycle and back stack

oncreate
-is called when the activity is creataed

rajbharath

	1. Async task is a helper class used for doing background work in separate thread and post the result back to the UI thread .
	2. It has 3 generics as input, params, progress,result
	3. 4 methods onPreExecute(), doInBackground(),onProgressUpdate(),onPostExecute()
	4. UI thread should start execute method.
	5. Async task can be cancelled at any point of time. onCancelled () will be called if its cancelled. And we can check isCancelled and exit the doInbackground method()
	6. This is not used for very long running operations.
	7. It can be used for short background operations typpically for few seconds.


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