XML Method Example for a Button:

TextView myOut;
EditText myText;

In onCreate:

        myText = (EditText) findViewById(R.id.editText);
        myOut = (TextView) findViewById(R.id.output);

New Method:

    public void calculate(View view)
    {
        myOut.setText(myText.getText().toString());

    }

OnClickListener Example for a button:


import android.widget.Button;
import android.widget.ImageView;
import android.view.View;
import android.view.View.OnClickListener;

 int counter;
 Button button;
 ImageView image;


image = (ImageView) findViewById(R.id.imageView1);

button.setOnClickListener(new OnClickListener() {

    public void onClick(View arg0) {
        if (counter == 1) {
           image.setImageResource(R.drawable.frog);
           counter--;
        } else {
           image.setImageResource(R.drawable.pig);
           counter++;
                }
            }
        });