两个布局文件：

 

 

两个Activity:

package com.may.activity;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

/**

 *

 */

public class Activity04 extends Activity {

 private EditText numOne = null;

 private EditText numTwo = null;

 private TextView symbol = null;

 private Button  calculate = null;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity04);

  numOne=(EditText)findViewById(R.id.numOne);

  numTwo=(EditText)findViewById(R.id.numTwo);

  symbol=(TextView)findViewById(R.id.symbol);

  calculate=(Button)findViewById(R.id.calculate);

  

  //为symbol

  symbol.setText("乘以");

  calculate.setText("计算");

  calculate.setOnClickListener(new CalculateListener());

 }

 

 @Override

 public boolean onCreateOptionsMenu(Menu menu) {

  menu.add(0, 1, 1, R.string.exit);

  menu.add(0, 2, 2, R.string.about);

  return super.onCreateOptionsMenu(menu);

 }

 @Override

 public boolean onOptionsItemSelected(MenuItem item) {

  if(item.getItemId()==1){

   finish();

  }else if(item.getItemId()==2){

   

  }

  return super.onOptionsItemSelected(item);

 }

 class CalculateListener implements OnClickListener{

  @Override

  public void onClick(View v) {

   String numOneStr = numOne.getText().toString().trim();

   String numTwoStr = numTwo.getText().toString().trim();

   Intent inten = new Intent();

   inten.putExtra("one", numOneStr);

   inten.putExtra("two", numTwoStr);

   inten.setClass(Activity04.this, Activity05.class);

   Activity04.this.startActivity(inten);

  }

  

 }

}

 

package com.may.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class Activity05 extends Activity {	private TextView resultTextView = null;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity05);		resultTextView = (TextView) findViewById(R.id.resultTextView);		Intent intent = getIntent();		int numOne = Integer.valueOf(intent.getStringExtra("one"));		int numTwo = Integer.valueOf(intent.getStringExtra("two"));		int resultValue = numOne * numTwo;		resultTextView.setText(resultValue+"");	}}

 在AndroidMainfest添加：