Android控件

package com.android.test;
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 ActivityDemo  extends Activity { 
         private EditText factorOne, factorTwo; 
         private TextView symbol; 
         private Button calculate; 
         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.edt1); 
                factorTwo = (EditText)findViewById(R.id.edt2); 
                symbol = (TextView)findViewById(R.id.tv); 
                calculate = (Button)findViewById(R.id.button); 
              //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 
         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 
         public  boolean onOptionsItemSelected(MenuItem item) { 
                 if(item.getItemId() == 1) { 
                        finish(); 
                } else  if(item.getItemId() == 2) { 
                } 
                 return  super.onOptionsItemSelected(item); 
        }
         class CalculateListener  implements OnClickListener {
                 public  void onClick(View v) { 
                        String factorOneStr = factorOne.getText().toString(); 
                        String factorTwoStr = factorTwo.getText().toString(); 
                         //封装起来，将这俩个值放到Intent对象中 
                        Intent intent =  new Intent(); 
                        intent.putExtra( "one", factorOneStr); 
                        intent.putExtra( "two", factorTwoStr); 
                        intent.setClass(ActivityDemo. this, ResultActivity. class); 
                        ActivityDemo. this.startActivity(intent); 
                } 
        } 
}
5:实现转换为计算结果的布局ResultActivity.java代码
package com.android.test;
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.widget.TextView;
public  class ResultActivity  extends Activity {
         private TextView resultView; 
         protected  void onCreate(Bundle savedInstanceState) { 
                 super.onCreate(savedInstanceState); 
                setContentView(R.layout.result); 
                resultView = (TextView)findViewById(R.id.result); 
                Intent intent = getIntent(); 
                String factorOneStr = intent.getStringExtra( "one"); 
                String factorTwoStr = intent.getStringExtra( "two"); 
                 //转换int类型 
                 int factorOneInt = Integer.parseInt(factorOneStr); 
                 int factorTwoInt = Integer.parseInt(factorTwoStr); 
                 int result = factorOneInt * factorTwoInt; 
                resultView.setText(result + ""); 
        } 
}