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Android Application (Component (Activities (Function (onCreate (Bandle):…

- - - - depend on
        
        user's choice (change of visibility)
        
        system constraints (memory storage)
    - - active (running) : on the top of the stack
      - paused (lost focus but still visible ) can killed by the sys ,
      - stopped (hidden and not visible ) : retains of all states and user info, killed by sys when need a memory space
      - inactive : killed and before lunch
      - life time
        
        entire lifetime (onStart <==> onStop)
        
        visible lifetime ( onCreate <==> onDestroy)
        
        foreground lifetime (onResume <==> onPause)
      - importance hierarchy of the process
        
        foreground/active process includes
        
        activities in active state (foreground responding to the user event)
        
        Broadcast Receivers executing onReseive event hablers
        
        Service executing onStart, onCreate or onDestroy event handler
        
        Running Serveries : flagged to run in the foreground
        
        visible process : partially obscured راح تتقفل ف حالات قليلة وحرجة عشان مثلا تسمح للاكتفتي الاساسية انها تستمر تشتغل
        
        service process
        
        process hosting Service that have been started
        
        killed in case if the active or visible process are need the resources
        
        background process
        
        not visible and not have any service (onStope() called)
        
        kill according to least-seen-first-killed
        
        empty process
        
        for caching perpose
        
        improve startup time the next time a component need to run in it
        
        routinely killed as required
        
        retain an application in the memory after it has reached the end of the lifetime
        
        process termination
        
        killProcess():
        
        lowMemKiller() : kill least used
    - - onCreate (Bandle): initialize setup ; followed by onStart
      - onStart: visible
      - onRestart : before becoming visible
      - onPause : become visible
      - onResume : visible and after being pause
      - onStop : not visible
      - onDestroy : cleanup and destroy activity like background proccess
    - - declarative app
        
        XML code
        
        define resource and layout
      - programmatic app
        
        Java code
        
        manage events and handle interaction with the user
    - - name : will use in java file and resulting class
      - label : string that will retrieve the activity name at the run time
    - - send message from one program to anther
      - what to do next
      - contains (action and data)
      - <action>
        
        the general action to be performed
      - <category>
        
        a string that contains additional info about the kind of component that should handle intent
  - - - query
      - insert,update and delete
    - - URI
      - MEME type
- - - - Shouldn't edit it
      - contains IDs of project resources
      - To access to the resources use
        
        findViewByID : findViewById (R.id.but1)
        
        Resources obj : getResources().getString(R.string.hello);
  - - - non-code resource
      - allow to provides diff resource
      - organized in res directories
        
        grouping the resource in sub directories according to the type and confederation
    - - color ( define state lest of the color)
      - drawble
      - layout
      - anim (tween animation )
      - raw ( save row form )
      - menu
      - values
        
        arrays
        
        color
        
        dimens
        
        strings
        
        styles
      - xml : arbitrary XAML than can read at runtime
      - alternative resource
        
        use with a specific congregation
        
        append with appropriate confederation qualifier with the directory name
        
        <config_qualifier>
      - default resource
        
        when no alternative resource that match the current configuration
        
        res/layout/
        
        <resource_name>
    - - In code
        
        use static integer from sub-class of your R class ( R.string.hello)
        
        R.<resource_type>.<resource_name>
      - In xml
        
        use a special XML syntax that corresponding to the resource ID define in your R class (@ string/hello)
        
        @ [package_name:]<resource_type>/<resource_name>
  - - - xmlns
        
        the name of the namespacewhere DTD for the xml parser is located
      - package
        
        java package name
      - android version
        
        version code for this version of the app
      - android version name
        
        version name for publishing