How to access content_main.xml elements in MainActivity.kt by using ViewBinding in Android Studio 4.1?

Question

For example, I want to access RecyclerView(Id recycler_view) elements in content_main.xml by Mainactivity.kt. content_main.xml is in activity_main.xml.

class PhotoDetailsActivity : AppCompatActivity() {
private lateinit var binding: ContentMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setSupportActionBar(findViewById(R.id.toolbar))
        binding = ContentMain.inflate(layoutInflater)
        binding.recycler_view.layoutManager = LinearLayoutManager(this)
....

    }
}

But this way does not work. How can i do that?

Answer 1

Replace:

        setContentView(R.layout.activity_main)
        setSupportActionBar(findViewById(R.id.toolbar))
        binding = ContentMain.inflate(layoutInflater)

with:

        binding = ContentMain.inflate(layoutInflater)
        setContentView(binding.root)
        setSupportActionBar(binding.toolbar)

You need to use the root of your inflated binding with setContentView() for the binding to work.