案例----装备选择

学会综合应用各组件，深度理解Activity，activity_main.xml及清单文件的关系

1.首先装备选择程序对应的布局文件activity_main.xml

注意：上面用到控件了ProgressBar（进度条）它一般用于访问网络展示Loading，有两种表现形式，水平和环形。

它的表现形式是由style属性控制的。

2.在新建layout，购买装备界面activity_shop,xml

<?xml version="1.0" encoding="utf-8"?>
<RealtiveLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
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="生命力"/>
<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，用于封装装备信息

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 getrName(){
return name;
}
public void setName(String name){
this.name=nama;
}
public int get Acctack(){
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 String toString(){
return "[name="+name+",acctack="+acctack+",life="+life+",speed="+speed+"]";
}

4.创建ShopActivity

public class ShopActivity extends Acyivity implements OnClickListener{
private ItemInfo itemInfo;
protected void onCreat(Bundle savedInstanceState){
super.onCreat(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 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;
}
}

注意：setReult()方法的作用是让当前Activity返回到它的调用者。

5.界面交互（MainActivity）

public class MainActivity extends Activity{
private ProgressBar mProgressBar1;
private ProgressBar mProgressBar2;
private ProgressBar mProgressBar3;
private TextView mLifeTV;
private TextView mAttackTV;
private TextView mSpeedTV;
protected void onCreat(Bundle savedInstanceState){
super.onCreat(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();
}
private void initProogress(){
mProgressBar1=(ProgressBar)findViewById(R.id.progressBar1);
mProgressBar2=(ProgressBar)findViewById(R.id.progressBar2);
mProgressBar3=(ProgressBar)findViewById(R.id.progressBar3);
}
//开启新的activity并且想获取他的返回值
public vlid 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){
//判断结果码是否等于1，等于1为宝宝添加装备
if(resultCode==1){
if(requestCode==1){
ItemInfo info=
(ItemInfo)data.getSerializableExtra("equipment");
//gengxin 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()+"");
}
}

6.最后配置清单文件

<activity>
android:name="cn.itcast.select.MainActivity"
android:lable="@string/app_name">
<intent_filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<activity android:name="cn.itcast.select.ShopActivity">
</activity>

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