MobX Sample

CounterActivity.kt

package com.example.mobxtest

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_counter.*
import magneton.observable.ReactionDisposer
import magneton.observable.computed
import magneton.observable.observable
import magneton.observable.reaction

class CounterActivity : AppCompatActivity() {
    private var count by observable(0)
    private val formattedCount by computed { "Count: $count" }

    private lateinit var disposer: ReactionDisposer

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_counter)
        incrementButton.setOnClickListener { increment() }
        decrementButton.setOnClickListener { decrement() }

        disposer = reaction {
            countTextView.text = formattedCount
        }
    }

    private fun increment() {
        count++
    }

    private fun decrement() {
        count--
    }

    override fun onDestroy() {
        disposer.dispose()
        super.onDestroy()
    }
}