Passing Data between Mobile Screens in Android

In this article, we will learn how to pass data between different mobile screens in Android.

1. Sharing Data b/w Activities

2. Sending Data from Activity to Fragment

3. Sending Data from Fragment to Activity

4. Sharing Data b/w Fragments

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Sharing Data b/w Activities :

As discussed in the Intent Article, the data can be passed from one activity to another using the intent object, which is used to communicate between components.

Sending Data with Intent

//SENDING DATA -> 
intent.putExtra("name",username) 
intent.putExtra("age",userage)
//first parameter is the tag that helps us identify data
//second parameter is the data that needs to be passed

//RECEIVING DATA ->
intent.getStringExtra(name)
intent.getIntExtra(age,0)
//first parameter is the tag that helps us identify data
//second parameter is the default value

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Sending Data from Activity to Fragment :

As discussed in the Fragment Article, the data can be passed from one activity to another using the bundle object.

Sending Data with Bundle

//SENDING DATA ->
//needs to be executed before committing the fragment transaction
val bundle = Bundle() //creating an object of Bundle class
bundle.putInt("position",position) //passing the tag & data 
fragment.arguments = bundle //binding the bundle to the fragment

//RECEIVING DATA ->
arguments?.getInt("position",0) //tag & default value is passed

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Sending Data from Fragment to Activity :

As discussed in the Fragment Article, the data can be passed from one activity to another using the object of the corresponding activity.

Sending Data with Activity Object

//SENDING DATA -> 
val mainActivity : MainActivity = activity as MainActivity
//creating the object of MainActivity
mainActivity.gettingData(userName,userAge)
//calling the function on the object of mainActivity
//passing the data as parameters 

//(activity as MainActivity).gettingData(userName,userAge)

//RECEIVING DATA ->
//user-defined function of our activity class
fun gettingData(userName : String, userAge : Int){
//used to receive data from fragment
    val name : String = "Name: $userName"
    val age : String = "Age: $userAge"
}

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Sharing Data b/w Fragments :

Sharing Data b/w Fragments can also be achieved using the Bundle Class.

//SENDING DATA -> 
val bundle = Bundle() 
bundle.putInt("name",username) //passing the tag & data 
val secondFragment = SecondFragment()
secondFragment.arguments = bundle
//... commit transaction

//RECEIVING DATA ->
val name : String = arguments?.getString("name").toString()

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