我想让用户通过动作顺序添加多个项目 [英] I want to let user add multiple items by action sequence
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问题描述
我在做一个应用程序中，我使用JSON到ListView中获取数据，并允许用户在另一种形式查看所选的项目，以singleMenuItem形式我已经放置了一个按钮，即 - 加入购物车，在这里，我想，只要用户将点击该按钮，然后选择项目需要查看购物车形式展现，然后返回到列表视图中的另一个活动选择一个项目>显示>再次单击添加到购物车按钮，显示所有由用户选择进入查看购物车表中的项目，我只是想显示项目的标题和成本，这些我取到SingleMenuItem形式使用意向的ListView的形式，现在我想表现出像查看购物车形式： - 由动作顺序添加多个项目，问题是我不知道如何更新查看购物车组成，每次只要用户点击加入购物车按钮。
目录（列表视图活动）code： -
公共类目录扩展活动{
静态字符串URL =HTTP：/ -------- /和/ menu.json;
静态字符串KEY_CATEGORY =项目;
静态最后弦乐KEY_TITLE =称号;
静态最后弦乐KEY_DESCRIPTION =说明;
静态最后弦乐KEY_COST =成本;
静态最后弦乐KEY_THUMB_URL =imageUri;
ListView控件列表;
LazyAdapter适配器;
/ **第一次创建活动时调用。 * /
@覆盖
保护无效的onCreate（包savedInstanceState）{
// TODO自动生成方法存根
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）;
最后的ArrayList＆LT; HashMap的＆LT;字符串，字符串＆GT;＆GT; itemsList =新的ArrayList＆LT; HashMap的＆LT;字符串，字符串＆GT;＆GT;（）;
名单=（ListView控件）findViewById（R.id.listView1）;
适配器=新LazyAdapter（这一点，itemsList）;
list.setAdapter（适配器）;
意图= getIntent（）;
KEY_CATEGORY = in.getStringExtra（类）;
尝试{
JSONArray jsonArray = json.getJSONArray（KEY_CATEGORY）;
的for（int i = 0; I＆LT; jsonArray.length（）;我++）{
HashMap的＆LT;字符串，字符串＆GT;图=新的HashMap＆LT;字符串，字符串＆GT;（）;
的JSONObject的JSONObject = jsonArray.getJSONObject（我）;
map.put（ID，将String.valueOf（I））;
map.put（KEY_TITLE，jsonObject.getString（KEY_TITLE））;
map.put（KEY_DESCRIPTION，jsonObject.getString（KEY_DESCRIPTION））;
map.put（KEY_COST，jsonObject.getString（KEY_COST））;
map.put（KEY_THUMB_URL，jsonObject.getString（KEY_THUMB_URL））;
itemsList.add（图）
}
返回itemsList;
}赶上（JSONException E）{
Log.e（log_tag，错误分析数据+ e.toString（））;
}
返回null;
}
@覆盖
保护无效onPostExecute（ArrayList中＆LT; HashMap的＆LT;字符串，字符串＆GT;＆GT;的结果）{
名单=（ListView控件）findViewById（R.id.listView1）;
适配器=新LazyAdapter（Catalogue.this，itemsList）;
list.setAdapter（适配器）;
this.progressDialog.dismiss（）;
list.setOnItemClickListener（新OnItemClickListener（）{
公共无效onItemClick（适配器视图＆LT;＆GT;母公司视图中查看，
INT位置，长的id）{
HashMap的＆LT;字符串，字符串＆GT;地图= itemsList.get（位置）;
意图=新的意图（Catalogue.this，SingleMenuItem.class）;
in.putExtra（KEY_TITLE，map.get（KEY_TITLE））;
in.putExtra（KEY_DESCRIPTION，map.get（KEY_DESCRIPTION））;
in.putExtra（KEY_THUMB_URL，map.get（KEY_THUMB_URL））;
in.putExtra（KEY_COST，map.get（KEY_COST））;
startActivity（在）;
}
}）;
的ImageButton viewShoppingCart =（的ImageButton）findViewById（R.id.ButtonViewCart）;
viewShoppingCart.setOnClickListener（新OnClickListener（）{
公共无效的onClick（视图v）{
意图=新的意图
（Catalogue.this，FinalOrder.class）;
startActivity（在）;
}
}）;
}}}
SingleMenuItem活动code
公共类SingleMenuItem延伸活动{
静态最后弦乐KEY_TITLE =称号;
静态最后弦乐KEY_COST =成本;
静态最后弦乐KEY_THUMB_URL =imageUri;
私人的EditText edit_qty_ code;
私人TextView的txt_total;
私人TextView的text_cost_ code;
私人双人itemamount = 0;
私人双人itemquantity = 0;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.single）;
意图= getIntent（）;
字符串标题= in.getStringExtra（KEY_TITLE）;
字符串thumb_url = in.getStringExtra（KEY_THUMB_URL）;
最后弦乐成本= in.getStringExtra（KEY_COST）;
ImageLoader的ImageLoader的=新ImageLoader的（getApplicationContext（））;
ImageView的imgv =（ImageView的）findViewById（R.id.single_thumb）;
TextView的txttitle =（TextView中）findViewById（R.id.single_title）;
TextView的txtcost =（TextView中）findViewById（R.id.single_cost）;
TextView的txtheader =（TextView中）findViewById（R.id.actionbar）;
txttitle.setText（职称）;
txtheader.setText（职称）;
txtcost.setText（成本）;
imageLoader.DisplayImage（thumb_url，imgv）;
的ImageButton addToCartButton =（的ImageButton）findViewById（R.id.img_add）;
addToCartButton.setOnClickListener（新OnClickListener（）{
公共无效的onClick（视图v）{
意图=新的意图
（SingleMenuItem.this，FinalOrder.class）;
in.putExtra（KEY_TITLE，getIntent（）getStringExtra（KEY_TITLE））;
in.putExtra（KEY_COST，getIntent（）getStringExtra（KEY_COST））;
startActivity（在）;
//关闭活动
完（）;
}
}）;
}}
ViewCart活动code： -
公共类FinalOrder扩展活动
{
静态最后弦乐KEY_TITLE =称号;
静态最后弦乐KEY_COST =成本;
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.view）;
意图= getIntent（）;
字符串TITLE1 = in.getStringExtra（KEY_TITLE）;
字符串COST1 = in.getStringExtra（KEY_COST）;
TextView的txttitle1 =（TextView中）findViewById（R.id.item_name）;
TextView的txtcost1 =（TextView中）findViewById（R.id.item_cost）;
txttitle1.setText（TITLE1）;
txtcost1.setText（COST1）;
}
}
解决方案
要获得查看购物车进行更新，你需要集中存储的数据。最好使用SQLite数据库。然后你就可以当用户添加到购物车中更新这个数据库，查看车那么当，就可以从数据库中读取。
I am making an app in which i am fetching data using JSON into ListView, and allowing user to view selected item in another form, in singleMenuItem form i have placed a button namely - Add to Cart, here i want whenever user will click on that button, then selected item need to show in View Cart form, then go back to Listview Select an item > show in another activity > again click on Add to Cart button and show all the items selected by user into View Cart Form, i just want to show Item's Title and Cost, those i am fetching into SingleMenuItem form using Intent from ListView Form and now i want to show in View Cart Form like:- add multiple items by action sequence, the problem is I don't know how to update View Cart form every time whenever user click on Add to Cart Button.
Catalogue(List View Activity) Code:-
public class Catalogue extends Activity{
static String URL = "http:/--------/and/menu.json";
static String KEY_CATEGORY = "item";
static final String KEY_TITLE = "title";
static final String KEY_DESCRIPTION = "description";
static final String KEY_COST = "cost";
static final String KEY_THUMB_URL = "imageUri";
ListView list;
LazyAdapter adapter;
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ArrayList<HashMap<String, String>> itemsList = new ArrayList<HashMap<String, String>>();
list=(ListView)findViewById(R.id.listView1);
adapter=new LazyAdapter(this, itemsList);
list.setAdapter(adapter);
Intent in = getIntent();
KEY_CATEGORY = in.getStringExtra("category");
try{
JSONArray jsonArray = json.getJSONArray(KEY_CATEGORY);
for(int i=0;i < jsonArray.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject jsonObject = jsonArray.getJSONObject(i);
map.put("id", String.valueOf(i));
map.put(KEY_TITLE, jsonObject.getString(KEY_TITLE));
map.put(KEY_DESCRIPTION, jsonObject.getString(KEY_DESCRIPTION));
map.put(KEY_COST, jsonObject.getString(KEY_COST));
map.put(KEY_THUMB_URL, jsonObject.getString(KEY_THUMB_URL));
itemsList.add(map);
}
return itemsList;
}catch(JSONException e) {
Log.e("log_tag", "Error parsing data "+e.toString());
}
return null;
}
@Override
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
list=(ListView)findViewById(R.id.listView1);
adapter=new LazyAdapter(Catalogue.this, itemsList);
list.setAdapter(adapter);
this.progressDialog.dismiss();
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
HashMap<String, String> map = itemsList.get(position);
Intent in = new Intent(Catalogue.this, SingleMenuItem.class);
in.putExtra(KEY_TITLE, map.get(KEY_TITLE));
in.putExtra(KEY_DESCRIPTION, map.get(KEY_DESCRIPTION));
in.putExtra(KEY_THUMB_URL, map.get(KEY_THUMB_URL));
in.putExtra(KEY_COST, map.get(KEY_COST));
startActivity(in);
}
});
ImageButton viewShoppingCart = (ImageButton) findViewById(R.id.ButtonViewCart);
viewShoppingCart.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent in = new Intent
(Catalogue.this, FinalOrder.class);
startActivity(in);
}
});
} }}
SingleMenuItem Activity Code
public class SingleMenuItem extends Activity{
static final String KEY_TITLE = "title";
static final String KEY_COST = "cost";
static final String KEY_THUMB_URL = "imageUri";
private EditText edit_qty_code;
private TextView txt_total;
private TextView text_cost_code;
private double itemamount = 0;
private double itemquantity = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single);
Intent in = getIntent();
String title = in.getStringExtra(KEY_TITLE);
String thumb_url = in.getStringExtra(KEY_THUMB_URL);
final String cost = in.getStringExtra(KEY_COST);
ImageLoader imageLoader = new ImageLoader(getApplicationContext());
ImageView imgv = (ImageView) findViewById(R.id.single_thumb);
TextView txttitle = (TextView) findViewById(R.id.single_title);
TextView txtcost = (TextView) findViewById(R.id.single_cost);
TextView txtheader = (TextView) findViewById(R.id.actionbar);
txttitle.setText(title);
txtheader.setText(title);
txtcost.setText(cost);
imageLoader.DisplayImage(thumb_url, imgv);
ImageButton addToCartButton = (ImageButton) findViewById(R.id.img_add);
addToCartButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent in = new Intent
(SingleMenuItem.this, FinalOrder.class);
in.putExtra(KEY_TITLE, getIntent().getStringExtra(KEY_TITLE));
in.putExtra(KEY_COST, getIntent().getStringExtra(KEY_COST));
startActivity(in);
// Close the activity
finish();
}
});
}}
ViewCart Activity Code:-
public class FinalOrder extends Activity
{
static final String KEY_TITLE = "title";
static final String KEY_COST = "cost";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view);
Intent in = getIntent();
String title1 = in.getStringExtra(KEY_TITLE);
String cost1 = in.getStringExtra(KEY_COST);
TextView txttitle1 = (TextView) findViewById(R.id.item_name);
TextView txtcost1 = (TextView) findViewById(R.id.item_cost);
txttitle1.setText(title1);
txtcost1.setText(cost1);
}
}
解决方案
To get the View Cart to update, you need to store the data centrally. Best to use an SQLite database. Then you can update this database when a user adds to the cart, then when viewing the cart, you can read from the database.
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