这个是书上的一个案例，我将其完善了一点而已

xml

显示创建一个xml的主界面

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<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context="sorgs.com.selectequipment.MainActivity">
    <ImageView
        android:id="@+id/pet_imgv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="30dp"
        android:src="@drawable/body"/>
    <TextView
        android:id="@+id/pet_dialog_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="25dp"
        android:gravity="center"
        android:text="主人，快给小宝宝购买装备吧"/>
    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginBottom="20dp">
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="生命值："
                android:textColor="@android:color/black"
                android:textSize="14sp"/>
            <ProgressBar
                android:id="@+id/progressBar1"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_weight="2"/>
            <TextView
                android:id="@+id/tv_life_progress"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="0"
                android:gravity="center"
                android:textColor="#000000" />
        </TableRow>
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="攻击力："
                android:textColor="@android:color/black"
                android:textSize="14sp"/>
            <ProgressBar
                android:id="@+id/progressBar2"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_weight="2"/>
            <TextView
                android:id="@+id/tv_attack_progress"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="0"
                android:gravity="center"
                android:textColor="#000000" />
        </TableRow>
        <TableRow
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="敏捷："
                android:textColor="@android:color/black"
                android:textSize="14sp"/>
            <ProgressBar
                android:id="@+id/progressBar3"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_weight="2"/>
            <TextView
                android:id="@+id/tv_speed_progress"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="0"
                android:gravity="center"
                android:textColor="#000000" />
        </TableRow>
    </TableLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
        android:id="@+id/btn_master"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:onClick="click1"
        android:drawablePadding="3dp"
        android:text="主人购买装备"
        android:textSize="14sp"/>
        <Button
            android:id="@+id/btn_baby"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:onClick="click2"
            android:drawablePadding="3dp"
            android:text="小宝宝购买装备"
            android:textSize="14sp"/>
    </RelativeLayout>
</LinearLayout>

然后在创建一个购买装备购买的页面

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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/r1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <View
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"/>
    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="60dp"
        android:text="商品名称"/>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical">
        <TextView
            android:id="@+id/tv_life"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13sp"
            android:text="生命值"/>
        <TextView
            android:id="@+id/tv_attack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13sp"
            android:text="攻击力"/>
        <TextView
            android:id="@+id/tv_speed"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13sp"
            android:text="速度"/>
    </LinearLayout>
</RelativeLayout>

JAVA

然后创建一个Itemfnfo类，用来封装装备信息

接着写代码

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package sorgs.com.domain;
import java.io.Serializable;
/**
 * Created by Administrator on 2016/11/20.
 */
public class ItemInfo implements Serializable{
    private String name;
    private int acctack;
    private int life;
    private int speed;
    public ItemInfo(String name, int acctack, int life, int speed){
        this.name = name;
        this.acctack = acctack;
        this.life = life;
        this.speed = speed;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAcctack() {
        return acctack;
    }
    public void setAcctack(int acctack) {
        this.acctack = acctack;
    }
    public int getLife() {
        return life;
    }
    public void setLife(int life) {
        this.life = life;
    }
    public int getSpeed() {
        return speed;
    }
    public void setSpeed(int speed) {
        this.speed = speed;
    }
    @Override
    public String toString() {
        return "[" + "name='" + name + ", acctack=" + acctack + ", life=" + life
                + ", speed=" + speed + "]";
    }
}

然后创建一个shopactivity，用来展示主人装备信息的

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package sorgs.com.selectequipment.sorgs.com;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import sorgs.com.domain.ItemInfo;
import sorgs.com.selectequipment.R;
/**
 * Created by Administrator on 2016/11/20.
 */
public class ShopActivity extends Activity implements View.OnClickListener {
    private ItemInfo itemInfo;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shop);
        itemInfo = new ItemInfo("金剑",100,20,20);
        findViewById(R.id.r1).setOnClickListener(this);
        TextView mLifeTV = (TextView) findViewById(R.id.tv_life);
        TextView mNameTV = (TextView) findViewById(R.id.tv_name);
        TextView mSpeedTV = (TextView) findViewById(R.id.tv_speed);
        TextView mAttackTV = (TextView) findViewById(R.id.tv_attack);
        //TextView 显示字符串，这里传入int值编译不会报错，运行会出错
        mLifeTV.setText("生命值+"+itemInfo.getLife());
        mNameTV.setText(itemInfo.getName());
        mSpeedTV.setText("敏捷度+"+itemInfo.getSpeed());
        mAttackTV.setText("攻击力+"+itemInfo.getAcctack());
    }
    @Override
    public void onClick(View view) {
        switch (view.getId()){
                case R.id.r1:
                    Intent intent = new Intent();
                    intent.putExtra("equipment",itemInfo);
                    setResult(1,intent);  //设置请求码
                    finish();
                    break;
        }
    }
}

再建立一个shopactivity2，用来放宝宝购买装备

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package sorgs.com.selectequipment.sorgs.com;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import sorgs.com.domain.ItemInfo;
import sorgs.com.selectequipment.R;
/**
 * Created by Administrator on 2016/11/20.
 */
public class ShopActivity2 extends Activity implements View.OnClickListener{
    private ItemInfo itemInfo;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shop);
        itemInfo = new ItemInfo("银剑",50,10,10);
        findViewById(R.id.r1).setOnClickListener(this);
        TextView mLifeTV = (TextView) findViewById(R.id.tv_life);
        TextView mNameTV = (TextView) findViewById(R.id.tv_name);
        TextView mSpeedTV = (TextView) findViewById(R.id.tv_speed);
        TextView mAttackTV = (TextView) findViewById(R.id.tv_attack);
        //TextView 显示字符串，这里传入int值编译不会报错，运行会出错
        mLifeTV.setText("生命值+"+itemInfo.getLife());
        mNameTV.setText(itemInfo.getName());
        mSpeedTV.setText("敏捷度+"+itemInfo.getSpeed());
        mAttackTV.setText("攻击力+"+itemInfo.getAcctack());
    }
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.r1:
                Intent intent = new Intent();
                intent.putExtra("equipment",itemInfo);
                setResult(2,intent);  //设置请求码
                finish();
                break;
        }
    }
}

最后编写我们的主函数

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package sorgs.com.selectequipment;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import sorgs.com.domain.ItemInfo;
import sorgs.com.selectequipment.sorgs.com.ShopActivity;
import sorgs.com.selectequipment.sorgs.com.ShopActivity2;
public class MainActivity extends AppCompatActivity {
    private ProgressBar mProgressBar1;
    private ProgressBar mProgressBar2;
    private ProgressBar mProgressBar3;
    private TextView mLifeTV;
    private TextView mAttackTV;
    private TextView mSpeedTV;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mLifeTV = (TextView) findViewById(R.id.tv_life_progress);
        mAttackTV = (TextView) findViewById(R.id.tv_attack_progress);
        mSpeedTV = (TextView) findViewById(R.id.tv_speed_progress);
        initProgress(); //初始化进度条
    }
    private void initProgress() {
        mProgressBar1 = (ProgressBar) findViewById(R.id.progressBar1);
        mProgressBar2 = (ProgressBar) findViewById(R.id.progressBar2);
        mProgressBar3 = (ProgressBar) findViewById(R.id.progressBar3);
        mProgressBar1.setMax(1000);  //设置最大的值1000
        mProgressBar2.setMax(1000);
        mProgressBar3.setMax(1000);
    }
    public void click1(View view){ //开启新的activity并且想获取他的返回值
        Intent intent = new Intent(this, ShopActivity.class);
        startActivityForResult(intent,1); //返回请求结果，请求码为1
    }
    public void click2(View view){ //开启新的activity并且想获取他的返回值
        Intent intent = new Intent(this, ShopActivity2.class);
        startActivityForResult(intent,2); //返回请求结果，请求码为2
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {//获取ShopActivity的装备信息
        super.onActivityResult(requestCode, resultCode, data);
        if (data != null){
            if (resultCode==1){ //判断结果码是否等于1，等于1为主人添加装备
                if (requestCode == 1){
                    ItemInfo info = (ItemInfo) data.getSerializableExtra("equipment");
                    updateProgress(info); //更新ProgressBar的值
                }
            }
            else if (requestCode == 2){//判断结果码是否等于2，等于2为宝宝添加装备，
                if (requestCode == 2){
                    ItemInfo info = (ItemInfo) data.getSerializableExtra("equipment");
                    updateProgress2(info); //更新ProgressBar的值
                }
            }
        }
    }
    private void updateProgress2(ItemInfo info) {
        int progress1 = mProgressBar1.getProgress();
        int progress2 = mProgressBar2.getProgress();
        int progress3 = mProgressBar3.getProgress();
        mProgressBar1.setProgress(progress1+info.getLife());
        mProgressBar2.setProgress(progress2+info.getAcctack());
        mProgressBar3.setProgress(progress3+info.getSpeed());
        mLifeTV.setText(mProgressBar1.getProgress()+"");
        mAttackTV.setText(mProgressBar2.getProgress()+"");
        mSpeedTV.setText(mProgressBar3.getProgress()+"");
    }
    private void updateProgress(ItemInfo info) { //更新ProgressBar的值
        int progress1 = mProgressBar1.getProgress();
        int progress2 = mProgressBar2.getProgress();
        int progress3 = mProgressBar3.getProgress();
        mProgressBar1.setProgress(progress1+info.getLife());
        mProgressBar2.setProgress(progress2+info.getAcctack());
        mProgressBar3.setProgress(progress3+info.getSpeed());
        mLifeTV.setText(mProgressBar1.getProgress()+"");
        mAttackTV.setText(mProgressBar2.getProgress()+"");
        mSpeedTV.setText(mProgressBar3.getProgress()+"");
    }
}

配置

最后一步，去配置清单里面去配置一下

效果