We will get Button action in 3 steps (Button declared as a
Globally)
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1. Create Globar variable for Button
lateinit var button : Button;
2. get Button reference from xml
button=findViewById(R.id.button) as Button;
3. set OnClickListener to Button
button.setOnClickListener(View.OnClickListener {
});
});
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Screen Shots:
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1. MainActivity.kt
class MainActivity : AppCompatActivity() { lateinit var button : Button;
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) button=findViewById(R.id.button) as Button; button.setOnClickListener(View.OnClickListener { Toast.makeText(applicationContext,"You Clicked
Button",Toast.LENGTH_SHORT).show(); }); } }
2. activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:background="#FF00FF" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/button" android:textStyle="bold" android:textSize="20dp" android:text="Click Me" android:textColor="#ffffff" android:layout_width="200dp" android:layout_height="50dp" android:layout_centerVertical="true" android:layout_centerHorizontal="true" /> </RelativeLayout>
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