Activity回传数据-案例:装备选择

装备选择主界面
Activity回传数据-案例:装备选择_第1张图片
1:创建程序:创建一个名为“装备选择”的工程,将包名改为cn.bzu.edu.com。装备选择程序对应的布局文件(activity_main.xml)如下所示:


<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="com.edu.bzu.cn.myapplication.MainActivity">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/pet_imgv"
        android:layout_gravity="center_horizontal"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="30dp"
        android:src="@drawable/baby" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/pet_dialog_tv"
        android:layout_gravity="center_horizontal"
        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="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginBottom="20dp">
        <TableRow
            android:layout_width="fill_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
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:id="@+id/progressBar"
                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="fill_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
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:id="@+id/progressBar2"
                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="fill_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
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:id="@+id/progressBar3"
                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"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="50dp"
        android:layout_marginTop="20dp">
        <Button
            android:id="@+id/btn_baby"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:drawablePadding="3dp"
            android:drawableRight="@android:drawable/ic_menu_add"
            android:onClick="click"
            android:text="小宝宝购买装备"
            android:textSize="14sp"/>
    RelativeLayout>



LinearLayout>

上述布局代码使用到了控件ProgressBar(进度条),它是用来显示小宝宝的生命值,攻击力和敏捷度的。
2:创建装备界面activity_shop.xml,该界面是来展示装备的,界面编写完成后,运行效果如图:
Activity回传数据-案例:装备选择_第2张图片
购买装备界面(activity_shop.xml)对应的布局文件如下:


<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:id="@+id/view"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:background="@android:drawable/ic_menu_info_details"
        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:layout_rightOf="@id/view"
        android:text="商品名称"/>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:orientation="vertical"
        android:layout_rightOf="@id/tv_name" >
        <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>

3:创建ItemInfo类
在程序中创建一个cn.bzu.edu.com包,在该包中创建一个ItemInfo类,用于封装装备信息,代码如下:

package com.edu.bzu.cn.domain;

import java.io.Serializable;

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;
    }
    public String toString(){
        return "[name="+name+",acctack="+acctack+",life="+life+",speed="+speed+"]";
    }

}


4:创建ShopActivity
ShopActivity是用来展示装备信息的,当单击ShopActivity的装备时,会调回MainActivity并将装备信息回传给MainActivity.具体代码如下:

package com.edu.bzu.cn.myapplication;

        import android.app.Activity;
        import android.content.Intent;
        import android.os.Bundle;
        import android.support.design.widget.FloatingActionButton;
        import android.support.design.widget.Snackbar;
        import android.support.v7.app.AppCompatActivity;
        import android.support.v7.widget.Toolbar;
        import android.view.View;
        import android.widget.TextView;

public class ShopActivity extends Activity implements View.OnClickListener{
    private  IntemInfo  itemInfo;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shop);
        itemInfo = new ItemInfo("宝剑", 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);
        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 v){
        switch (v.getId()){
            case R.id.r1:
                Intent intent=new Intent();
                intent.putExtra("equipment",itemInfo);
                setResult(1,intent);
                finish();
                break;;
        }
    }
}

5:编写界面交互代码(MainActivity)
MainActivity主要用于响应按钮的点击事件,并将返回的装备信息显示到指定的ListView控件中,代码如下:

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.progressBar);
        mProgressBar2=(ProgressBar)findViewById(R.id.progressBar2);
        mProgressBar3=(ProgressBar)findViewById(R.id.progressBar3);
        mProgressBar1.setMax(1000);
        mProgressBar2.setMax(1000);
        mProgressBar3.setMax(1000);

    }
    //开启新的activity并且想获取它的返回值
    public void click(View view){
        Intent intent=new Intent(this,ShopActivity.class);
        startActivityForResult(intent,1);//返回请求结果,请求码为1
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(data!=null){
            if (resultCode==1){
                if (requestCode==1){
                    ItemInfo info=(ItemInfo)data.getSerializableExtra("equipment");
                    updateProgress(info);
                }
            }
        }
    }
    private void updateProgress(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()+"");
    }
}

6:清单文件的配置:
使用Activity时需要在清单文件中配置,代码如下:

 <activity android:name="cn.bzu.edu.com.MainActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
        <activity
            android:name="cn.bzu.edu.com.ShopActivity">
           activity>

7:运行程序选择装备:
运行程序,在主界面分别单击“主人购买装备”“小宝宝购买装备”按钮,会跳转至装备展示页面,装备购买成功后,会看到如图所示界面:
Activity回传数据-案例:装备选择_第3张图片
Activity回传数据-案例:装备选择_第4张图片
从图可以看出,主人购买装备或小宝宝购买装备都完成了,购买的装备会显示在界面的ListView中,并且进度条的值会随着装备的购买而增加。

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