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Android

button.setOnClickListener(listener); why we use this code if the guy said it run with top function first here is mycode

// button.setOnClickListener(listener); <----- Why we use this code

public class FunFactsActivity extends AppCompatActivity { // created a variable for using it private TextView changetext; private Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);
    //using the variable

    changetext = (TextView) findViewById(R.id.changetextview);
    button = (Button) findViewById(R.id.factbutton);

    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            //here the button is clicked now change the textView to other strings
               String Fact = "Cow Can knock on the Window or Door to Need Food";
            changetext.setText(Fact);


        }
    };
    button.setOnClickListener(listener);                       

    }

}