Intent ,Bundle 组件 两个Activity 互相传值

第一个Activity 

/**
 * 
 */
package com.flysnow.sina.weibo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 首页Activity
 * @author 
 * @since 2011-3-8
 */
public class HomeActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login_table);     
        
        Button login= (Button) findViewById(R.id.login);
        
        login.setOnClickListener(new Button.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                try {
                    EditText u = (EditText) findViewById(R.id.username);
                    EditText p = (EditText) findViewById(R.id.password);
                    EditText h = (EditText) findViewById(R.id.height);
                    RadioButton s= (RadioButton) findViewById(R.id.sex_man);
                    String username=u.toString();
                    String passwd=p.toString();
                    double  height= Double.parseDouble(h.getText().toString());  //转换为double类型 
                    String sex;
                    if(s.isChecked()){
                        sex ="男性";
                    }else{
                        
                        sex ="女性";
                    }
                    Intent intent=new Intent();
                    intent.setClass(HomeActivity.this, MoreActivity.class);
                    Bundle bu=new Bundle();　　　　　　　　// 这个组件 存值
                    bu.putString("username", username);
                    bu.putString("passwd", passwd);
                    bu.putString("sex", sex);
                    bu.putDouble("height", height);
                    intent.putExtras(bu);　　　　//放到 intent 里面  然后 传出去
                    startActivity(intent);
                }catch(Exception e){
                    // TODO: handle exception
                    Toast.makeText(HomeActivity.this,"errorrrrr", Toast.LENGTH_LONG).show();
                }
                
            }});
        
    };
    
                                        //从传过去的页面返回数据 的方法
    protected void onActivityResult(int requestCode, int resultCode,Intent data) {
            // TODO Auto-generated method stub
            super.onActivityResult(requestCode, resultCode, data);
            RadioButton radiobutton_Man= (RadioButton) findViewById(R.id.sex_man);
            RadioButton radiobutton_Woman= (RadioButton) findViewById(R.id.sex_woman);
            EditText edit_height = (EditText) findViewById(R.id.height);
        switch (resultCode) {
            case RESULT_OK:
            /* 取得来自Activity2 的数据，并显示于画面上*/
            Bundle bunde = data.getExtras();
            String sex = bunde.getString("sex");
            double height = bunde.getDouble("height");
            edit_height.setText("" + height);
            if (sex.equals("男性")) {
            radiobutton_Man.setChecked(true);
            } else {
            radiobutton_Woman.setChecked(true);
            } 
            break;
            
            default:
            break;
            }
    }
    
    
}

第二个Activity 

/**
 * 
 */
package com.flysnow.sina.weibo;


import java.text.DecimalFormat;
import java.text.NumberFormat;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

/**
 * 更多Activity
 * @author 
 * @since 2011-3-8
 */
public class MoreActivity extends Activity {
    
    private Intent intent;
    private Bundle budle;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.layout2);    
        
        TextView a=(TextView) findViewById(R.id.textView111);
        
        intent= this.getIntent();  //接受的数据
        budle =intent.getExtras();
        
        String sex =budle.getString("sex");
        double height = budle.getDouble("height");
        String tizhong = this.getWeight(sex, height);
        
        /*使用CharSequence类getString()方法从XML中获取String*/
        CharSequence string2=getString(R.string.app_name);
        
        
        String z = "("+string2+")你是一个"+sex+",你的身高为"+height+"你的标准体重为"+tizhong;
        a.setText(z);
        
        Button back= (Button) findViewById(R.id.back);        //返回事件
        back.setOnClickListener(new Button.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                //返回result 回上一个activity 
                MoreActivity.this.setResult(RESULT_OK, intent);
                //结束这个activity 
                MoreActivity.this.finish();
            }
        });
        
    }
    
    /* 四舍五入的method */
    private String format(double num) {
        NumberFormat formatter = new DecimalFormat("0.00");
        String s = formatter.format(num);
        return s;
    }
    
    private String getWeight(String sex, double height) {
        String weight = "";
        if (sex.equals("男性")) {
        weight = format((height - 80) * 0.7);
        } else {
        weight = format((height - 70) * 0.6);
        } 
        
        return weight;
    }
    
}