不同Activity之间的数据传递---Bundle对象的实现

package irdc.ex03_10;
/* import相关class */
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;
public class EX03_10 extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
/* 载入main.xml Layout */
setContentView(R.layout.main);
/* 以findViewById()取得Button对象，并加入onClickListener */
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new Button.OnClickListener()
{
public void onClick(View v)
{
/*取得输入的身高*/
EditText et = (EditText) findViewById(R.id.height);
double height=Double.parseDouble(et.getText().toString());
/*取得选择的性别*/ String sex="";
RadioButton rb1 = (RadioButton) findViewById(R.id.sex1);
if(rb1.isChecked()) { sex="M"; }
else{ sex="F"; }
/*new一个Intent对象，并指定class*/
Intent intent = new Intent();
intent.setClass(EX03_10.this,EX03_10_1.class);
/*new一个Bundle对象，并将要传递的数据传入*/
Bundle bundle = new Bundle();
bundle.putDouble("height",height);
bundle.putString("sex",sex);
/*将Bundle对象assign给Intent*/
intent.putExtras(bundle);
/*调用Activity EX03_10_1*/
startActivity(intent);
}
});
}
}

package irdc.ex03_10;

/* import相关class */
import java.text.DecimalFormat;
import java.text.NumberFormat;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class EX03_10_1 extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/* 加载main.xml Layout */
setContentView(R.layout.myalyout);

/* 取得Intent中的Bundle对象 */
Bundle bunde = this.getIntent().getExtras();

/* 取得Bundle对象中的数据 */
String sex = bunde.getString("sex");
double height = bunde.getDouble("height");

/*判断性别 */
String sexText="";
if(sex.equals("M")){
sexText="男性";
}else{
sexText="女性";
}

/* 取得标准体重 */
String weight=this.getWeight(sex, height);

/* 设定输出文字 */
TextView tv1=(TextView) findViewById(R.id.text1);
tv1.setText("你是一位"+sexText+"\n你的身高是"+height+
"公分\n你的标准体重是"+weight+"公斤");
}

/* 四舍五入的method */
private String format(double num)
{
NumberFormat formatter = new DecimalFormat("0.00");
String s=formatter.format(num);
return s;
}

/* 以findViewById()取得Button对象，onClickListener */
private String getWeight(String sex,double height)
{
String weight="";
if(sex.equals("M"))
{
weight=format((height-80)*0.7);
}else
{
weight=format((height-70)*0.6);
}
return weight;
}
}