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  • Switching between Activities along with data using Kotlin

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    The important announcement by Google in 2017 for Android Developers is that kotlin is now an official language for Android App Development. For more on introduction and basic you can visit previous blog "Getting Started with Kotlin for Android App Development - An Introduction and Basics".

     

     

    Coming to the topic, today in this tutorial, I will guide you about how we can navigate/switch and sending data between two activities. So, being an android developer you must have sent data between two activities but in kotlin the syntax's are different.

     

    Let's see an example of two activities, in the first one, Data is sent to another activity and in next one Data is received:

     

    Activity 1: Send data to another activity

    package com.multipleactivities.android.activity
    
    import android.content.Intent
    import android.os.Bundle
    import android.support.v7.app.AppCompatActivity
    import android.widget.Button
    import android.widget.EditText
    import com.multipleactivities.android.R
    import com.multipleactivities.android.constants.AppConstants
    
    class FirstActivity : AppCompatActivity() {
        private var btnNavigate: Button? = null
        private var etWriteText: EditText? = null
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_first)
    
            // initializing button
            initView()
    
            // button click
            define()
        }
    
        private fun initView() {
            btnNavigate = findViewById(R.id.btn_navigate) as Button
            etWriteText = findViewById(R.id.et_write_text) as EditText
        }
    
        private fun define() {
    
            btnNavigate!!.setOnClickListener {
                val intent = Intent(this@FirstActivity, SecondActivity::class.java)
                intent.putExtra(AppConstants.VALUE, etWriteText!!.text.toString())
                startActivity(intent)
            }
        }
    }
    

    In above code, you can see the kotlin syntax, we are sending user input to the another activity through intent.

     

     

    Activity 2: Receiving Data

    package com.multipleactivities.android.activity
    
    import android.os.Bundle
    import android.support.v7.app.AppCompatActivity
    import android.widget.TextView
    import com.multipleactivities.android.R
    import com.multipleactivities.android.constants.AppConstants
    
    class SecondActivity : AppCompatActivity() {
        private var tvReceivedText: TextView? = null
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_second)
    
            // initializing views
            initView()
    
            // receiving intent values
            receivingValue()
        }
    
        private fun receivingValue() {
            val intent = intent
            val value = intent.getStringExtra(AppConstants.VALUE)
            tvReceivedText!!.text = value
        }
    
        private fun initView() {
            tvReceivedText = findViewById(R.id.tv_received_text) as TextView
        }
    }
    

    In above code, you can see we getting the data using get intent and displaying it in textView.

    Switching between Activities along with data using Kotlin

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