Quick quesiton, so `findViewById` is no longer nec...

# android

[DJ2]

Quick quesiton, so findViewById is no longer necessary,

val btnSaveClick= findViewById<Button>(R.id.btnSave)
      btnSaveClick?.setOnClickListener {
          Toast.makeText(this@ArticleAdapter, "Article saved.", Toast.LENGTH_LONG).show()
      }

What should be used instead.

I have this in my activity.xml:

<Button
            android:id="@+id/btnSave"
            android:layout_width="70dp"
            android:layout_height="40dp"
            android:onClick="btnSave"
            android:text="@string/save"
            android:textAlignment="center" />

[tevjef]

If you have Kotlin Android Extensions applied to your project. The findViewById code will be generated for you. https://kotlinlang.org/docs/tutorials/android-plugin.html

btnSave.setOnClickListener { }

You reference the view in code by the id.

[DJ2]

in my onCreate function do I have to do this btnSave.setOnClickListener(this);?

[Thiago Pereira]

Nops. Just button.setOnClickListener{}

[DJ2]

It has to be a function right?

[Thiago Pereira]

It's a block

[Thiago Pereira]

{ Your code }

[DJ2]

It’s expecting a member declaration

[Thiago Pereira]

Can u show your code?

[DJ2]

This is my recyclerView adapter

import kotlinx.android.synthetic.main.articlerecycler_item.view.*


class ArticleAdapter(private val controller: IController) : RecyclerView.Adapter<ArticleViewHolder>() {

  override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ArticleViewHolder {
      val view = LayoutInflater.from(parent.context).inflate(R.layout.articlerecycler_item, parent, false)
      return ArticleViewHolder(view)


  }
    /** Called when the user taps the Save button  */
     btnSave.setOnClickListener(){
        (R.layout.articlerecycler_item)
        AlertDialog.Builder(this)
                .setMessage("Article Saved.")
                .create()
                .show()
        // Do something in response to button click
    }

  override fun getItemCount(): Int {
      return controller.articles.size
  }

  override fun onBindViewHolder(holder: ArticleViewHolder, position: Int) {

      val article: Article = controller.articles[position]

      if(article.title.length > 100) {
        holder.itemView.titleTv.text = "${article.title.substring(0, 99)}..."
      } else {
        holder.itemView.titleTv.text = article.title
      }

      holder.itemView.authorTv.text = article.author
  }
}
class ArticleViewHolder(view: View?) : RecyclerView.ViewHolder(view)

[DJ2]

and my button in my layout xml

<Button
            android:id="@+id/btnSave"
            android:layout_width="70dp"
            android:layout_height="40dp"
            android:onClick="btnSave"
            android:text="@string/save"
            android:textAlignment="center" />

[Thiago Pereira]

Remove the ( ) from your btnSave. U can do just button.setOnClickListener { your code }