The Binding approach , moving between the activities by intent

1. Binding Approach instead of R. approach

for using view-binding approach instad of R.layout, R.id. approach

Step 1:
    inside the build.gradle (Module:app) file
    inside the android block
    android{
        ....
        ....    
        buildFeatures{
            viewBinding true
            }
    }

    add buildFeature and set viewBinding to true
   
Step 2:
    inside the MainActivity( or some intent of view in which we want to use binding )
            create a variable
    var binding_name : ActivityMainBinding? = null
    Note: 
        * ActivityMainBinding now refers to activity_main.xml file
        * so set name according to the activity file

Step 3:
    now set up the binding by layoutInflater
    binding = ActivityMainBinding.inflate(layoutInflater)

   
now the R.layout is reffered to root of layout
now the R.id is reffered to the root->id_of_the_element
    syntax wise work as
    1.
        setContentView(binding_name?.root) // instead of setContentView(R.layout.activity_main)
   
    2.    
        binding_name?.id_of_the_element?.setOnClickListner{..} //
        instead of
                        var object_name = findViewByID(R.id.id_of_the_element)
                         object_name.setOnClickListner{ .... }

 

Step 4: 
    add a onDestroy function and use it to prevent memory leakages 
    override fun onDestroy(){
        super.onDestroy()
        binding_name = null
    }

 

Benefits / or why should we use binding approach insted of R. approach
        1. The approach will make code shorter and concise
        2. Faster and more effiecient during compile time
        3. we can now have same id to different file's elements and still can use them
        4. google recommends this approach

 

2.Moving between activities by intent creation
    inside some function by which we have to change the activity 
    add the code below 

     1.Creating intent
        val intent = Intent(this, Another_Activity_name::class.java)
     2. passing data by intent
        intent.putExtra(Constants.Name_Of_Variable_Who_Will_Recieve, variable_having_data_to_be_passed.text.toString()) // for passing data of this intent to another
        // Constants is a constant class file havin g the variable Name_Of_Variable_Who_Will_Recieve ( in this case it will be in string form )
       
        on reciving side
       

mYour_Name = intent.getStringExtra(Constants.Name_of_Variable_Who_Will_recieve)

      3. Starting the new activity by intent
        startActivity(intent) // for starting the new activity
      4. Closing the current activity
        finish() // for closing the current  activity