ValeraSetrakov

data class Category (
        val id: Long
)

data class SubCategory (
        val id: Long,
        val categoryId: Long
)

ValeraSetrakov

class CustomDialog : DialogFragment() {
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        return AlertDialog.Builder(requireContext())
                .setMessage("Привет")
                .setNegativeButton("Закрыть") {_,_ -> }
                .create()
    }
}

fun showCustomDialog(activity: AppCompatActivity) {

ValeraSetrakov

@Module
class AppModule(
        private val applicationContext: Context
) {

    @Singleton
    @Provides
    fun provideContext(): Context {
        return applicationContext
    }

ValeraSetrakov

@Module
class AppModule(
        private val applicationContext: Context
) {

    @Singleton
    @Provides
    fun provideContext(): Context {
        return applicationContext
    }

ValeraSetrakov

@Module
class AppModule(
        private val applicationContext: Context
) {

    @Singleton
    @Provides
    fun provideContext(): Context {
        return applicationContext
    }

ValeraSetrakov

@Module
public class AppModule {
 
    private Context appContext;

    public AppModule(Context appContext){
        this.appContext = appContext;
    }

    @Provides

ValeraSetrakov

class ActivityA: AppCompatActivity() {
    
    companion object {
        private const val SOME_CODE = 1
    }
    
    private fun someAction() {
        ActivityB.startForResult(this, "some param", SOME_CODE)
    }

ValeraSetrakov

class CustomActivity: AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_test)
        val rv = findViewById<RecyclerView>(R.id.rv_test)
        rv.layoutManager = LinearLayoutManager(this)
        rv.adapter = CustomAdapter(listOf("Text 1", "Text 2"))
    }
}

ValeraSetrakov

thread {
            Thread.sleep(10_000)
            val handler = Handler(mainLooper)
            handler.post{
                // do something at main thread
            }
        }