Fatal Exception: Main Kotlinnullpointerexception

This is my first time building an android application. However when i run the app on my Virtual Device, it stopped working and keeps crashing. The error says something about null p

Solution 1:

Because your date EditText is null.Before use editText initialise editText like this

var date = findViewById<View>(R.id.date) as? EditText

then set the value of date

date?.setText("15-11-2017")
date?.isEnabled = false

Solution 2:

Your EditText is null. You can initialize your EditText. Example Kotlin code,

overridefunonCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_add_sales)

    val date = findViewById<EditText>(R.id.editTextDate)
    date.apply {
        setText("15-11-2017")
        isEnabled = false
    }
  }

Solution 3:

It seems like you forgot to initialize date editText. Why not to try Kotlin Android Extension plugin. By using this plugin you don't need to initialize the views instead you can directly use them using their id. For your case: Just add import

import kotlinx.android.synthetic.main.activity_add_sales.*

Then you can now remove your:

val date: EditText? = nullval changeDate: CheckBox? = nullval yes: RadioButton? = nullval no: RadioButton? = null

and you can access them by their ids. like

date.setText("15-11-2017")

Solution 4:

val date: EditText? = nullval changeDate: CheckBox? = nullval yes: RadioButton? = nullval no: RadioButton? = null

Before using these variables, initialize them with findViewById or bind them to the xml view.