android简单的乘法运算

最近在自学android，自己在学习的时候，做了一个简单的乘法运行，代码如下所示：
一：页面布局main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
   
<EditText
    android:id="@+id/factoryone"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
/>
<TextView 
    android:id="@+id/symbol"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<EditText
    android:id="@+id/factorytwo"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
   />
<Button
    android:id="@+id/colculator"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
/>
</LinearLayout>
==========================
显示结果界面：result.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView
    android:id="@+id/result"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>
二：代码实现：
package mars.activity03;

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;
//1.在Activity03当中，要声明四个控件
//2.要为其中的两个控件设置显示的值
//3.创建一个监听器类，监听按钮按下的动作
//4.将监听器类的对象，绑定在按钮对象上
public class Activity03 extends Activity {
    /** Called when the activity is first created. */
private EditText factorOne ;
private EditText factorTwo;
private TextView symbol;
private Button calculate;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //根据控件的ID来取得代表控件的对象
        factorOne = (EditText)findViewById(R.id.factorOne);
        factorTwo = (EditText)findViewById(R.id.factorTwo);
        symbol = (TextView)findViewById(R.id.symbol);
        calculate = (Button)findViewById(R.id.calculate);
        //为symbol和calculate设置显示的值
//        symbol.setText("乘以");
//        calculate.setText("计算");
        symbol.setText(R.string.symbol);
        calculate.setText(R.string.calculate);
        //将监听器的对象绑定到按钮对象上面
        calculate.setOnClickListener(new CalculateListener());
    }
    //当客户点击MENU按钮的时候，调用该方法
    @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);
}
    //当客户点击菜单当中的某一个选项时，会调用该方法
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == 1){
finish();
}
return super.onOptionsItemSelected(item);
}
class CalculateListener implements OnClickListener{

@Override
public void onClick(View v) {
//取得两个EditText控件的值
String factorOneStr = factorOne.getText().toString();
String factorTwoStr = factorTwo.getText().toString();
//将这两个值存放到Intent对象当中
Intent intent = new Intent();
intent.putExtra("one",factorOneStr);
intent.putExtra("two",factorTwoStr);
intent.setClass(Activity03.this, ResultActivity.class);
//使用这个Intent对象来启动ResultActivity
Activity03.this.startActivity(intent);
}
    }
}
三：得到结果的代码：
package mars.activity03;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
//1.接受从Activity03当中所传递的值
//2.计算两个值的积
//3.将计算的结果显示在Activity上
public class ResultActivity extends Activity{
private TextView resultView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
resultView = (TextView)findViewById(R.id.result);
//得到Intent对象当中的值
Intent intent = getIntent();
//取出存在Intent里的值
String factorOneStr = intent.getStringExtra("one");
String factorTwoStr = intent.getStringExtra("two");
//转化成整形
int factorOneInt = Integer.parseInt(factorOneStr);
int factorTwoInt = Integer.parseInt(factorTwoStr);
//计算两个值的积
int result = factorOneInt * factorTwoInt;
resultView.setText(result + "");
}

}