Android数据回传---装备选择
在使用新浪微博app时，能发现在微博发布页面进入图库选择图片后，会回到微博发布页面并带回了图片选择页面的图片信息。由于这种需求十分常见，因此掌握Android回传方法，格外重要。因此，以一个装备选择案例更好的理解Android回传功能。
1.界面布局
<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"
tools:context=".Main"
android:orientation="vertical"
android:gravity="center">
<ImageView
android:id="@+id/pet_imgv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginBottom="5dp"
android:layout_marginTop="30dp"
android:src="@drawable/baby"/>
<TextView
android:id="@+id/pet_dialog_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
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
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="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp">
<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_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"
android:layout_marginTop="5dp">
<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_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:drawableRight="@android:drawable/ic_menu_add"
android:onClick="click"
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:drawablePadding="3dp"
android:drawableRight="@android:drawable/ic_menu_add"
android:onClick="click2"
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。
ProgressBar几个常用方法属性
1.style属性
2.setMax（）：进度条最大值
3.setProgress（）：设置当前进度
4.getProgress（）：获取当前进度
2.创建装备界面（）
<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
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
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;
}
}
} 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);
}
} 6.清单文件的配置
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
intent-filter>
activity>
<activity android:name=".ShopActivity"/>