how to pass object from one activity to another activity in android Kotlin?

Question

I am new to android Kotlin. I am trying to Pass object from one activity to another activity I got stuck,

MyClass :

data class MyPojo(val name: String, val age: String) : Serializable

FirstActivity :

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val editTextName = findViewById<EditText>(R.id.EditName)
    val editTextAge = findViewById<EditText>(R.id.EditAge)

    val button = findViewById<Button>(R.id.ButtonSend)

    button.setOnClickListener {

      val object1 = MyPojo(editTextName.text.toString(),editTextAge.text.toString())

        val intent = Intent(this,Main2Activity::class.java)
        intent.putExtra("Obj",object1)
        startActivity(intent)
    }
  }
}

SecondActivity :

class Main2Activity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main2)

    val obj :MyPojo = intent.getSerializableExtra("obj") as MyPojo

    val textView : TextView = findViewById(R.id.textViewName)
    val textViewAge : TextView = findViewById(R.id.textViewAge)

    textView.setText(obj.name)
    textViewAge.setText(obj.age)

  }
}

Error :

6-28 19:35:58.625 22192-22192/com.example.evalai.passingobjecttoactivity E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.evalai.passingobjecttoactivity, PID: 22192 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.evalai.passingobjecttoactivity/com.example.evalai.passingobjecttoactivity.Main2Activity}: kotlin.TypeCastException: null cannot be cast to non-null type com.example.evalai.passingobjecttoactivity.MyPojo at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) at android.app.ActivityThread.access$800(ActivityThread.java:156) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5371) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:945) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:740) Caused by: kotlin.TypeCastException: null cannot be cast to non-null type com.example.evalai.passingobjecttoactivity.MyPojo at com.example.evalai.passingobjecttoactivity.Main2Activity.onCreate(Main2Activity.kt:14) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)

You used `Obj` in one place and `obj` in the other... -_- – EpicPandaForce Jun 28 '18 at 16:09 — EpicPandaForce, Jun 28 '18 at 16:09

DAA · Accepted Answer · 2018-06-28T16:16:07.893

The key you are providing for storing your pojo into the Intent is not the same key you are using to read it (you are storing with "Obj" and reading with "obj").

When you read the intent in your Main2Activity, there is nothing stored with that key, so you return null. And, obviously, you can't cast null to MyPojo.

To avoid these problems, you should always declare a constant for the keys of your intents:

const val ARG_POJO = "argPojo"

And use it to store and read from them:

Store:

intent.putExtra(ARG_POJO, object1)

Read:

val obj: MyPojo = intent.getSerializableExtra(ARG_POJO) as MyPojo

score 1 · Answer 2 · answered Apr 13 '22 at 21:26

Step 1: Make your data class serializable

data class MyPojo(val name: String, val age: String) : Serializable

Step 2: From Sending Activity

val object1 = MyPojo(editTextName.text.toString(),editTextAge.text.toString())
val intent = Intent(this,Main2Activity::class.java)
intent.putExtra("Obj",object1 as Serializable)
startActivity(intent)

Step 3: At receiving activity

val receivedObject:MyPojo=intent?.getSerializableExtra(Obj) as MyPojo

That's it.

how to pass object from one activity to another activity in android Kotlin?

2 Answers2