How to get input from the user

public class MainActivity extends AppCompatActivity {

    TextView textview;
    Button button;
    EditText edittext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textview = findViewById(R.id.textview);
        button = findViewById(R.id.button);
        edittext = findViewById(R.id.edittext);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String sTextFromET = edittext.getText().toString();
                int nIntFromET = new Integer(sTextFromET).intValue();

                textview.setText("Number = "+nIntFromET);

            }
        });

    }
}