Simple example of using CheckBox in Kotlin | Android

Though Kotlin has lot massive features to speedup the development time, here is the simple way of using Button in Android. In Kotlin we don't need to declare and initialize CheckBox. We simply access the id of CheckBox from Kotlin file.

Ex :

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.widget.Toast
import android.widget.Toast.LENGTH_LONG
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        myCheckBox.setOnCheckedChangeListener { view, isChecked ->
            Toast.makeText(this, isChecked.toString(), LENGTH_LONG).show()
        }
    }
}

Did you noticed, we never declare myCheckBox nor initialized, instead we directly accessed it from activity_main.
And inside setOnCheckedChangeListener method, we didn't implement `onCheckedChanged` interface.

So, If you think this is the right time to start with Kotlin, then start alongside with your current project. Yes, you can use Java and Kotlin in same project. If your current Activity is java, don't worry, you can create your next Activity in kotlin. Or you can convert your current Activity also to Kotlin and then continue learning Kotlin in same Activity.

Here is the full video tutorial

Interesting right?

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Using Button in Kotlin | Android


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