gistfile1.txt

package com.android.tareaderoxana;

import android.os.Bundle;
import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.widget.EditText;

public class MainActivity extends Activity {

  @Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// Event Change de numero 1
		EditText editText1 = (EditText) findViewById(R.id.editText1);
		editText1.addTextChangedListener(new TextWatcher() {
			public void afterTextChanged(Editable s) {
				EditText editText2 = (EditText) findViewById(R.id.editText2);
				if (!editText2.hasFocus()) {
					int product;
					if (s.length() == 0) {
						product = 0;
					} else {
						product = Integer.parseInt(s.toString()) * 5;
					}
					editText2.setText(Integer.toString(product));
				}
			}

			@Override
			public void beforeTextChanged(CharSequence arg0, int arg1,
					int arg2, int arg3) {
			}

			@Override
			public void onTextChanged(CharSequence s, int start, int before,
					int count) {
			}

		});
		// Para el edittext2
		EditText editText2 = (EditText) findViewById(R.id.editText2);
		editText2.addTextChangedListener(new TextWatcher() {
			public void afterTextChanged(Editable s) {
				EditText editText1 = (EditText) findViewById(R.id.editText1);
				if (!editText1.hasFocus()) {
					int division;
					if (s.length() == 0 || s.toString().equals("0")) {
						division = 0;
					} else {
						division = (Integer.parseInt(s.toString()) / 5);
					}
					editText1.setText(Integer.toString(division));
				}

			}

			@Override
			public void beforeTextChanged(CharSequence arg0, int arg1,
					int arg2, int arg3) {
			}

			@Override
			public void onTextChanged(CharSequence s, int start, int before,
					int count) {
			}

		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}