Start activity from button.setOnClickListener which lies in my RecyclerView

Question

I want an activity/class to run on a Button click. The Button is inside my RecyclerView. I first had the code in my MainActivity with:

btnComplete.setOnClickListener {
            startActivity(Intent(this@MainActivity, DelComplete::class.java))}

This code was in my onCreate of my MainActivity. How ever on running the code I found the error:

 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

My first thought was that it could not reach the Button since it was in the RecyclerView. So I tried to put the code in my RecyclerView. But I read that it is not a good idea to put it in you RecyclerView and I dont know what to do with the Context as it keeps throwing errors.

RecyclerView:

     txtbutton1.setOnClickListener {
                    confirmdel()
                    modal.tvdone = "Delivered"
                    Log.e("Clicked", "Successful delivery")
                    //this is where I add code to export data through api
                    modal.state = DataState.Success
                    Status = 1
                    notifyDataSetChanged()}

    private fun confirmdel() {
        startActivity(Intent(this, DelComplete::class.java))}

It might be as simple as filling in the Context but I am unsure what the Context must be to test that theory.

Recyclerview- table_list_item

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"

    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/txtWOrder"
        android:layout_width="160dp"
        android:layout_height="match_parent"
        android:layout_gravity="top"
        android:background="@drawable/table_content_cell_bg"
        android:text="@string/worder"
        android:textSize="18sp"
        tools:ignore="TextContrastCheck" />

    <TextView
        android:id="@+id/txtDElNote"
        android:layout_width="190dp"
        android:layout_height="match_parent"
        android:layout_gravity="top"
        android:background="@drawable/table_content_cell_bg"
        android:text="@string/delnote"
        android:textSize="18sp"
        tools:ignore="TextContrastCheck" />

    <TextView
        android:id="@+id/txtCompany"
        android:layout_width="190dp"
        android:layout_height="match_parent"
        android:layout_gravity="top"
        android:background="@drawable/table_content_cell_bg"
        android:text="@string/company"
        android:textSize="18sp"
        tools:ignore="TextContrastCheck" />

    <Button
        android:id="@+id/btnComplete"
        android:layout_width="250dp"
        android:layout_height="match_parent"
        android:layout_gravity="top"
        android:background="@drawable/table_header_cell_bg"
        android:drawableTint="#70D5C8"
        android:text="@string/button1"
        android:textSize="18sp" />

    <Button
        android:id="@+id/btnException"
        android:layout_width="250dp"
        android:layout_height="match_parent"
        android:layout_gravity="top"
        android:background="@drawable/table_content_cell_bg"
        android:text="@string/button2"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/txttvdone"
        android:layout_width="50dp"
        android:layout_height="match_parent"
        android:background="@drawable/table_content_cell_bg"
        android:foregroundGravity="center_horizontal"
        android:text=""
        android:textAlignment="center"
        android:textSize="24sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/txtWeight"
        android:layout_width="190dp"
        android:layout_height="match_parent"
        android:layout_gravity="top"
        android:background="@drawable/table_content_cell_bg"
        android:text="@string/weight"
        android:textSize="18sp"
        tools:ignore="TextContrastCheck" />
</LinearLayout>

The reason why I have a Button in my RecyclerView is on every entry a driver should be able to give feedback on a delivery. Every entry is a different order. Did I go the wrong way of doing this?

My Button does the following:

   txtbutton1.setOnClickListener {

                    confirmdel()
                    modal.tvdone = "Delivered"
                    Log.e("Clicked", "Successful delivery")
                    //this is where I add code to export data through api
                    modal.state = DataState.Success
                    Status = 1
                    notifyDataSetChanged()
                }

It does that with no problem. Now however I want to add an AlertDialog and update data in my DB with the setOnClickListener. Will this be possible from within my adapter?

Answer 1

You can use the context like this :

class Adapter(private val context: Context, private val myList: List<String>) :
RecyclerView.Adapter<Adapter.ViewHolder>()

And pass the context where required like this

    private fun confirmdel() {
    startActivity(Intent(context, DelComplete::class.java))}