This is the Main activity for a simple todo list app if you want to see more of the code then please let me know
When private lateinit var todoAdapter: TodoAdapter is removed app no longer crashes but the app will no longer show the todo item on the recycler view
"package com.example.todoit
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.text.TextUtils
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.todoit.data.Todo
import com.example.todoit.data.TodoViewModel
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
private lateinit var todoAdapter: TodoAdapter
private lateinit var todoViewModel: TodoViewModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
rvTodoItems.layoutManager = LinearLayoutManager(this)
rvTodoItems.adapter = todoAdapter
btnAddTodo.setOnClickListener {
val todoTitle = etTodoTitle.text.toString()
if (todoTitle.isNotEmpty()) {
val todo = Todo(0,todoTitle,false)
etTodoTitle.text.clear()
insertDataToDataBase()
todoAdapter.addTodo(todo)
}
}
btnDeleteTodo.setOnClickListener {
todoAdapter.deleteDoneTodos()
}
}
private fun insertDataToDataBase() {
val todoTitle = etTodoTitle.text.toString()
if(inputCheck(todoTitle)) {
val todo = Todo(0, todoTitle, isChecked = false)
//Add data to database
todoViewModel.addTodoToDataBase(todo)
Toast.makeText(this, "Successfully Added", Toast.LENGTH_LONG).show()
}else{
Toast.makeText(this, "Please fill out all fields", Toast.LENGTH_LONG).show()
}
}
private fun inputCheck(todoTitle:String):Boolean {
return !(TextUtils.isEmpty(todoTitle))
}
}
2
Answers
The error clear your todoAdapter not initialzed you have to initialize before using like this :
you forgot to initialize your todoAdapter, you need to initialize todoAdapter before calling it.