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  • Switching between Activities along with data using Kotlin

    @mohit.bisht
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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

    1. package com.multipleactivities.android.activity
    2.  
    3. import android.content.Intent
    4. import android.os.Bundle
    5. import android.support.v7.app.AppCompatActivity
    6. import android.widget.Button
    7. import android.widget.EditText
    8. import com.multipleactivities.android.R
    9. import com.multipleactivities.android.constants.AppConstants
    10.  
    11. class FirstActivity : AppCompatActivity() {
    12.     private var btnNavigate: Button? = null
    13.     private var etWriteText: EditText? = null
    14.  
    15.     override fun onCreate(savedInstanceState: Bundle?) {
    16.         super.onCreate(savedInstanceState)
    17.         setContentView(R.layout.activity_first)
    18.  
    19.         // initializing button
    20.         initView()
    21.  
    22.         // button click
    23.         define()
    24.     }
    25.  
    26.     private fun initView() {
    27.         btnNavigate = findViewById(R.id.btn_navigate) as Button
    28.         etWriteText = findViewById(R.id.et_write_text) as EditText
    29.     }
    30.  
    31.     private fun define() {
    32.  
    33.         btnNavigate!!.setOnClickListener {
    34.             val intent = Intent(this@FirstActivity, SecondActivity::class.java)
    35.             intent.putExtra(AppConstants.VALUE, etWriteText!!.text.toString())
    36.             startActivity(intent)
    37.         }
    38.     }
    39. }
    40.  

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

     

     

    Activity 2: Receiving Data

    1. package com.multipleactivities.android.activity
    2.  
    3. import android.os.Bundle
    4. import android.support.v7.app.AppCompatActivity
    5. import android.widget.TextView
    6. import com.multipleactivities.android.R
    7. import com.multipleactivities.android.constants.AppConstants
    8.  
    9. class SecondActivity : AppCompatActivity() {
    10.     private var tvReceivedText: TextView? = null
    11.  
    12.     override fun onCreate(savedInstanceState: Bundle?) {
    13.         super.onCreate(savedInstanceState)
    14.         setContentView(R.layout.activity_second)
    15.  
    16.         // initializing views
    17.         initView()
    18.  
    19.         // receiving intent values
    20.         receivingValue()
    21.     }
    22.  
    23.     private fun receivingValue() {
    24.         val intent = intent
    25.         val value = intent.getStringExtra(AppConstants.VALUE)
    26.         tvReceivedText!!.text = value
    27.     }
    28.  
    29.     private fun initView() {
    30.         tvReceivedText = findViewById(R.id.tv_received_text) as TextView
    31.     }
    32. }
    33.  

    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
    kotlin tutorial passing data in kotlin Android kotlin
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