实验任务——装备选择

最新推荐文章于 2021-12-15 14:53:16 发布

change__x

最新推荐文章于 2021-12-15 14:53:16 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/change__x/article/details/65945388

本次实验的训练目标：

1) 掌握组件ProgressBar的使用

2) 掌握startActivityForResult方法的使用

1.创建程序（装备选择程序对应的的布局文件）：

<?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:id="@+id/activity_main"
    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="bzu.edu.cn.a15lab05.MainActivity"
    >
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/baby"
        android:layout_marginTop="25dp"
        android:layout_gravity="center_horizontal"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="主人，快给小宝宝买装备吧！"
        android:layout_gravity="center_horizontal"
        android:textSize="18sp"
        />
    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="25dp"
        >
        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">
            <TextView
                android:layout_height="wrap_content"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:text="生命力"
                />
            <ProgressBar
                android:id="@+id/progressBar1"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_width="0dp"
                android:layout_weight="3"
                />
            <TextView
                android:layout_height="wrap_content"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:text="80"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="5dp"

                />
        </TableRow>


        <!--第二个-->

        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp">
        <TextView
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="攻击力"
            />
        <ProgressBar
            android:id="@+id/progressBar2"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_width="0dp"
            android:layout_weight="3"
            />
        <TextView
            android:layout_height="wrap_content"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="80"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="5dp"

            />

            </TableRow>

<!--第三个-->

        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp">
            <TextView
                android:layout_height="wrap_content"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:text="敏捷度"
                />
            <ProgressBar
                android:id="@+id/progressBar3"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_height="wrap_content"
                android:layout_marginLeft="20dp"
                android:layout_width="0dp"
                android:layout_weight="3"
                />
            <TextView
                android:layout_height="wrap_content"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:text="80"
                android:layout_marginLeft="20dp"
                android:layout_marginTop="5dp"

                />
            </TableRow>



    </TableLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
       >
        <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:drawablePadding="3dp"
            android:text="主人购买装备"
            android:textSize="14sp"
            android:onClick="click1"
            android:drawableRight="@android:drawable/ic_menu_add"

            />
        <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:drawablePadding="3dp"
            android:text="小宝宝购买装备"
            android:textSize="14sp"
            android:onClick="click2"
            android:drawableRight="@android:drawable/ic_menu_add"
            />

     </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、攻击值和敏捷度的。ProgressBar通常用于访问网络展示Loading对话框以及下载文件时显示的进度。
2.创建装备界面：
  
   
   <?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
  
    android:id="@+id/rl"  
    android:layout_width="match_parent"  
    android:layout_height="wrap_content"  
    android:orientation="vertical">  
    <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: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"  
            android:layout_marginTop="5dp"/>  
        <TextView  
            android:id="@+id/tv_speed"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:textSize="13sp"  
            android:text="敏    捷"  
            android:layout_marginTop="5dp"/>  
    </LinearLayout>  
</RelativeLayout>

3.创建ItemInfo类：
    
     
     package cn.intast.domain;

import java.io.Serializable;

/**
 * Created by lenovo on 2017/3/23.
 */

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 + "]";
    }


}

需要注意的是，Intent除了传递基本类型之外，只能传递Serializable或Parcelable类型的数据，为了方便数据传递，在这里让ItemInfo类实现Serializable接口。

4.创建ShopActivity：
      
       
       package select.itcast.cn.huichuan;  
  
/** 
 * Created by wanglaoda on 15-8-2. 
 */  
import android.app.Activity;  
import android.content.Intent;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.TextView;  
  
  
public class ShopActivity extends Activity implements 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.rl).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 v) {  
        // TODO Auto-generated method stub  
        switch (v.getId()) {  
            case R.id.rl:  
                Intent intent = new Intent();  
                intent.putExtra("equipment", itemInfo);  
                setResult(1, intent);  
                finish();  
                break;  
        }  
    }  
}

上述代码中的重点代码是后几行，从这段代码中可以看出，使用setResult（）方法跳转Activity不需要指定要跳转的Activity。setReult（）方法的作用是让当前Activity返回到它的调用者，在这里可以理解为让ShopActivity返回到MainActivity。

5.编写界面交互代码：

package select.itcast.cn.huichuan;  
  
import android.app.Activity;  
import android.content.Intent;  
import android.os.Bundle;  
import android.view.Menu;  
import android.view.MenuItem;  
import android.view.View;  
import android.widget.ProgressBar;  
import android.widget.TextView;  
  
  
public class Main extends Activity {  
  
    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);        //设置最大值1000  
        mProgressBar2.setMax(1000);  
        mProgressBar3.setMax(1000);  
    }  
  
    // 开启新的activity并且想获取他的返回值  
    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  
    }  
  
    public void click2(View view) {  
        Intent intent = new Intent(this, ShopActivity.class);  
        startActivityForResult(intent, 1);  
    }  
  
    @Override  
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
        super.onActivityResult(requestCode, resultCode, data);  
        if (data != null) {  
            // 判断结果码是否等于1,等于1为主人添加装备,等于2为宝宝添加装备  
            if (resultCode == 1) {  
                if (requestCode == 1) {  
                    ItemInfo info= (ItemInfo) data.getSerializableExtra("equipment");  
                    //更新ProgressBar的值  
                    updateProgress(info);  
                }  
            }  
        }  
    }  
    //更新ProgressBar的值  
    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() + "");  
    }  
  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.menu_main, menu);  
        return true;  
    }  
  
    @Override  
    public boolean onOptionsItemSelected(MenuItem item) {  
        // Handle action bar item clicks here. The action bar will  
        // automatically handle clicks on the Home/Up button, so long  
        // as you specify a parent activity in AndroidManifest.xml.  
        int id = item.getItemId();  
  
        //noinspection SimplifiableIfStatement  
        if (id == R.id.action_settings) {  
            return true;  
        }  
  
        return super.onOptionsItemSelected(item);  
    }  
}

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。

6.清单文件的配置：

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
    package="select.itcast.cn.huichuan" >  
  
    <application  
        android:allowBackup="true"  
        android:icon="@mipmap/ic_launcher"  
        android:label="@string/app_name"  
        android:theme="@style/AppTheme" >  
        <activity  
            android:name=".Main"  
            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=".ShopActivity"/>  
    </application>  
  
</manifest>

运行效果如图所示：