Activity之间的数据传输的示例（实现根据身高计算标准体重）

1.编写一个实现java.io.Serializable接口的Java类，在该类中创建两个变量用于储存数据，并实现它的set和get方法说明：在Bundle传递数据包的时候，可以放入一个可序列化的对象。这样，当要传递的数据字段较多的时候，采用该方法比较方便。在例子中，为了在Bundle中放入一个可以序列化的对象，我们创建了一个可以序列化的Java类，这样方便储存序列化的对象。2.可序列化的Info类

package activty.zhanghang.com.myapplication;

import java.io.Serializable;

/**
* Created by dell-pc on 2016/2/8.
*/
public class Info implements Serializable {
private static final long serialVersionUID = 1L;
private String sex = "";//性别
private int stature = 0;//身高
public int getStature() {
return stature;
}

public void setStature(int stature) {
this.stature = stature;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}
}

3.各个文件信息MainActivty

package activty.zhanghang.com.myapplication;

import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private Button btn;
private  int RequestCode = 1;
private EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.curculate);
editText = (EditText) findViewById(R.id.edittext);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Info info = new Info();
String heigth = editText.getText().toString();
if("".equals(heigth)){
Toast.makeText(MainActivity.this,"请输入您的身高",Toast.LENGTH_SHORT).show();
return;
}

int stature = Integer.parseInt(editText.getText().toString());
RadioGroup sex = (RadioGroup) findViewById(R.id.sex);
//获取单选按钮的值
for (int i=0;i<sex.getChildCount();i++){
RadioButton r = (RadioButton) sex.getChildAt(i);//根据索引值获取单选按钮
if(r.isChecked()){
info.setSex(r.getText().toString());
break;
}
}
info.setStature(stature);
Bundle bundle = new Bundle();//实例化一个Bundle对象
bundle.putSerializable("info", info);//将输入的基本信息保存在Bundle中
Intent intent = new Intent(MainActivity.this,ResultActivity.class);
intent.putExtras(bundle);
startActivityForResult(intent,RequestCode);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==RequestCode){
if (resultCode==ResultActivity.ResultCode){
Bundle bundle = data.getExtras();
String result = bundle.getString("result");
Toast.makeText(MainActivity.this,result,Toast.LENGTH_SHORT).show();
}
}
}
}

对应的xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="activty.zhanghang.com.myapplication.MainActivity">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请选择您的性别："
android:layout_gravity="center_vertical"/>
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/sex"
android:orientation="horizontal">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"/>
</RadioGroup>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请输入您的身高："/>
<EditText
android:layout_width="227dp"
android:layout_height="wrap_content"
android:id="@+id/edittext" />
</LinearLayout>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="计算"
android:id="@+id/curculate"
android:layout_gravity="center_horizontal"/>
</LinearLayout>

ResultActivity.java

package activty.zhanghang.com.myapplication;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.TextView;import java.text.DecimalFormat;import java.text.NumberFormat;/*** Created by dell-pc on 2016/2/8.*/public class ResultActivity extends AppCompatActivity {public static int ResultCode = 1;private Button btn;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.result);TextView sex = (TextView) findViewById(R.id.sex);TextView height = (TextView) findViewById(R.id.height);TextView normal = (TextView) findViewById(R.id.normal);btn = (Button) findViewById(R.id.back);btn.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.putExtra("result","谢谢您的使用");setResult(ResultCode, intent);finish();}});Intent intent = getIntent();Bundle bundle = intent.getExtras();Info info = (Info) bundle.getSerializable("info");//获取一个可以序列化的info对象sex.setText("您是一位"+info.getSex()+"士");//通过序列化的info对象获取序列化的值height.setText("您的身高是"+info.getStature()+"厘米");//显示计算后的数据normal.setText("您的标准体重是"+getWeight(info.getSex(),info.getStature())+"公斤");}/*** 计算*/private String getWeight(String sex,float stature){String weight="";NumberFormat format = new DecimalFormat();if(sex.equals("男")){weight = format.format((stature-80)*0.7);}else{weight = format.format((stature-70)*0.6);}return weight;}}

对应的xml布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/sex"android:textSize="30dp"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/height"android:textSize="30dp"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/normal"android:textSize="30dp"/><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/back"android:text="返回"/></LinearLayout>