[Android Studio] Button on click example

If you are new to Android Programming and Android Studio IDE and want to know how to perform a button on click action you are at the right place,

In this example I have created a simple project "My Application" that has a hello world text at the center of the Activity, I have replaced it with a button, the activity_main.xml file looks like this, note that I have added a new attribute android:onClick="buttonClicked" which will be the method in MainActivity.java that will perform the action when this button is clicked!

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="133dp"
        android:layout_height="45dp"
         android:onClick="buttonClicked"
        android:text="Button"
        tools:layout_editor_absoluteX="139dp"
        tools:layout_editor_absoluteY="279dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
    }


    /**
     * 
     * This method will be called when the button
     * with id @+id/button is clicked
     * 
     * @param view
     */
    public void buttonClicked(View view) {

        Toast.makeText(this,"Hello, you just clicked the button!",
         Toast.LENGTH_SHORT).show();
    }

As you can see I have defined the method public void buttonClicked(View view) that will display a toast message when the button is clicked.

⚡️The other way to implement Button on Click action in using onClickListener - check out examples - https://code2care.org/q/android-studio-button-on-click-listener-example

Have Questions? Post them here!