ListView的自定义ArrayAdapter和自定义对象 [英] ListView with custom ArrayAdapter and custom object
本文介绍了ListView的自定义ArrayAdapter和自定义对象的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
下面是我的应用程序的背景细节：
- 在我的主要活动使用FragmentPagerAdapter展示几个不同的片段。
- 对于我的片段中的一个，我使用的是正在使用的自定义对象类的自定义ArrayAdapter填充一个ListView，在这种情况下，新政。
- 使用传递到自定义ArrayAdapter一个ArrayList
我基本上是停留在：当我点击的ListView片段页面上的任何交易，我要到另一个活动，并通过从特定交易对象的信息。所以，如果我点击成交1笔，我想在新政1对象传递给新的活动，它的信息。如果我点击成交2笔，我想在新政2物体传递到新的活动，它的信息。我不确定要放什么东西在onItemClickListener。
请注意，该ArrayList会得到它是从后外部源对象，只是在考试科目增加为现在。我将需要使用一个ArrayAdapter中的信息传递给新的活动页面？
DealsFragment
公共类DealsFragment扩展片段{@覆盖
公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{ 查看查看= inflater.inflate（R.layout.fragment_show_deals，集装箱，FALSE）;
ListView控件的ListView =（ListView控件）view.findViewById（R.id.dealsListView）; //样品组数据传递到适配器，用于测试目的
ArrayList的＆LT;＆应对GT; all_deals =新的ArrayList＆LT;＆应对GT;（）;
all_deals.add（新政（成交1，R.drawable.test_image，389，700，750，500））;
all_deals.add（新政（成交2，R.drawable.test_image，20，80，1800，1500））;
all_deals.add（新政（成交3，R.drawable.test_image，1932年，2000年，75，60））;
all_deals.add（新政（新政4，R.drawable.test_image，198，450，450，350））;
all_deals.add（新政（成交5，R.drawable.test_image，60，70，1500，1100））; //设置适配器将数据传递到XML
DealAdapter适配器=新DealAdapter（getActivity（），R.layout.listview_item_row，all_deals）; //添加回标题行中
//浏览标题=（查看）inflater.inflate（R.layout.listview_header_row，NULL）;
// LV.addHeaderView（头）; listView.setAdapter（适配器）; listView.setOnItemClickListener（新OnItemClickListener（）{
@覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{ 意向意图=新意图（getActivity（），DealPage.class）;
startActivity（意向）;
}
}）; 返回视图。
}}
DealAdapter
公共类DealAdapter扩展ArrayAdapter＆LT;＆应对GT; {上下文语境;
INT layoutResourceId;
ArrayList的＆LT;＆应对GT;数据= NULL;公共DealAdapter（上下文的背景下，INT layoutResourceId，ArrayList的＆LT;＆新政GT;数据）{
超级（上下文，layoutResourceId，数据）;
this.layoutResourceId = layoutResourceId;
this.context =背景;
this.data =数据;
}静态类ViewHolder
{
ImageView的imgDealImage;
TextView的txtDescription;
TextView的txtSupporters;
TextView的txtRegularPrice;
TextView的txtDiscountPrice;
}@覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
ViewHolder支架=无效; 如果（convertView == NULL）
{
LayoutInflater充气=（（活动）上下文）.getLayoutInflater（）;
convertView = inflater.inflate（layoutResourceId，父母，假）; 持有人=新ViewHolder（）;
holder.imgDealImage =（ImageView的）convertView.findViewById（R.id.imgDealImage）;
holder.txtDescription =（TextView中）convertView.findViewById（R.id.txtDescription）;
holder.txtSupporters =（TextView中）convertView.findViewById（R.id.txtSupporters）;
holder.txtRegularPrice =（TextView中）convertView.findViewById（R.id.txtRegularPrice）;
holder.txtDiscountPrice =（TextView中）convertView.findViewById（R.id.txtDiscountPrice）; convertView.setTag（保持器）;
}
其他
{
支架=（ViewHolder）convertView.getTag（）;
} INT图像= data.get（位置）.getImage（）;
字符串描述= data.get（位置）.getDescription（）;
INT currentSupporters = data.get（位置）.getCurrentSupporters（）;
INT maxSupporters = data.get（位置）.getMaxSupporters（）;
INT regularPrice = data.get（位置）.getRegularPrice（）;
INT discountPrice = data.get（位置）.getDiscountPrice（）; holder.imgDealImage.setImageResource（图片）;
holder.txtDescription.setText（介绍）;
holder.txtSupporters.setText（将String.valueOf（currentSupporters +/+ maxSupporters +支持者））;
holder.txtRegularPrice.setText（将String.valueOf（$+ regularPrice））;
holder.txtRegularPrice.setPaintFlags（holder.txtRegularPrice.getPaintFlags（）| Paint.STRIKE_THRU_TEXT_FLAG）;
holder.txtDiscountPrice.setText（将String.valueOf（$+ discountPrice））; 返回convertView;
}}
解决方案
酪氨酸这个..
listView.setOnItemClickListener（新OnItemClickListener（）{
@覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;母公司，观景，INT位置，长的id）{ 这笔交易的交易= all_deals.get（位置）; 意向意图=新意图（getActivity（），Deal1.class）;
束束=新包（）;
bundle.putInt（CurrentSupporters，deal.getCurrentSupporters（））;
bundle.putInt（MaxSupporters，deal.getMaxSupporters（））;
bundle.putInt（RegularPrice，deal.getRegularPrice（））;
bundle.putInt（DiscountPrice，deal.getDiscountPrice（））;
intent.putExtras（包）;
startActivity（意向）; }
}）;
和获取deal1.class日期
捆绑包= getIntent（）getExtras（）。
串CurrentSupporters = bundle.getInt（CurrentSupporters）;
Syste.out.println（CurrentSupporters：+ CurrentSupporters）;
串MaxSupporters = bundle.getInt（MaxSupporters）;
串RegularPrice = bundle.getInt（RegularPrice）;
串DiscountPrice = bundle.getInt（DiscountPrice）;
Here are the background details of my app:
- Using a FragmentPagerAdapter in my main activity to show couple of different fragments.
- For one of my fragments, I am using a ListView that is populated by a custom ArrayAdapter that is using a custom object class, in this case "Deal".
- Using an ArrayList passed into the custom ArrayAdapter.
What I basically am stuck on: when I click any "deal" on the ListView fragment page, I want to go to another activity and pass in the info from the specific Deal object. So, if I click Deal 1, I want to pass in the Deal 1 object to the new activity for it's info. If I click on Deal 2, I want to pass in the Deal 2 object to the new activity for it's info. I am unsure what to put in the onItemClickListener.
Please note, the ArrayList will get it's object from an external source later, just adding in the test subjects for now. Will I need to use the ArrayAdapter to pass in the information to the new activity page?
DealsFragment
public class DealsFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_show_deals, container, false);
ListView listView = (ListView)view.findViewById(R.id.dealsListView);
// Sample set of data passed to adapter for testing purposes
ArrayList<Deal> all_deals = new ArrayList<Deal>();
all_deals.add(new Deal("Deal 1", R.drawable.test_image, 389, 700, 750, 500));
all_deals.add(new Deal("Deal 2", R.drawable.test_image, 20, 80, 1800, 1500));
all_deals.add(new Deal("Deal 3", R.drawable.test_image, 1932, 2000, 75, 60));
all_deals.add(new Deal("Deal 4", R.drawable.test_image, 198, 450, 450, 350));
all_deals.add(new Deal("Deal 5", R.drawable.test_image, 60, 70, 1500, 1100));
// Sets up adapter to pass data into XML
DealAdapter adapter = new DealAdapter(getActivity(), R.layout.listview_item_row, all_deals);
// TO ADD HEADER ROW BACK IN
// View header = (View)inflater.inflate(R.layout.listview_header_row, null);
// LV.addHeaderView(header);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(getActivity(), DealPage.class);
startActivity(intent);
}
});
return view;
}
}
DealAdapter
public class DealAdapter extends ArrayAdapter<Deal> {
Context context;
int layoutResourceId;
ArrayList<Deal> data = null;
public DealAdapter(Context context, int layoutResourceId, ArrayList<Deal> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
static class ViewHolder
{
ImageView imgDealImage;
TextView txtDescription;
TextView txtSupporters;
TextView txtRegularPrice;
TextView txtDiscountPrice;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
convertView = inflater.inflate(layoutResourceId, parent, false);
holder = new ViewHolder();
holder.imgDealImage = (ImageView)convertView.findViewById(R.id.imgDealImage);
holder.txtDescription = (TextView)convertView.findViewById(R.id.txtDescription);
holder.txtSupporters = (TextView)convertView.findViewById(R.id.txtSupporters);
holder.txtRegularPrice = (TextView)convertView.findViewById(R.id.txtRegularPrice);
holder.txtDiscountPrice = (TextView)convertView.findViewById(R.id.txtDiscountPrice);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder)convertView.getTag();
}
int image = data.get(position).getImage();
String description = data.get(position).getDescription();
int currentSupporters = data.get(position).getCurrentSupporters();
int maxSupporters = data.get(position).getMaxSupporters();
int regularPrice = data.get(position).getRegularPrice();
int discountPrice = data.get(position).getDiscountPrice();
holder.imgDealImage.setImageResource(image);
holder.txtDescription.setText(description);
holder.txtSupporters.setText(String.valueOf(currentSupporters + " / " + maxSupporters + " Supporters"));
holder.txtRegularPrice.setText(String.valueOf("$" + regularPrice));
holder.txtRegularPrice.setPaintFlags(holder.txtRegularPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
holder.txtDiscountPrice.setText(String.valueOf("$" + discountPrice));
return convertView;
}
}
解决方案
Tyr this..
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Deal deal = all_deals.get(position);
Intent intent = new Intent(getActivity(), Deal1.class);
Bundle bundle = new Bundle();
bundle.putInt("CurrentSupporters", deal.getCurrentSupporters());
bundle.putInt("MaxSupporters", deal.getMaxSupporters());
bundle.putInt("RegularPrice", deal.getRegularPrice());
bundle.putInt("DiscountPrice", deal.getDiscountPrice());
intent.putExtras(bundle);
startActivity(intent);
}
});
and getting date in deal1.class
Bundle bundle = getIntent().getExtras();
String CurrentSupporters = bundle.getInt("CurrentSupporters");
Syste.out.println("CurrentSupporters : "+CurrentSupporters);
String MaxSupporters = bundle.getInt("MaxSupporters");
String RegularPrice = bundle.getInt("RegularPrice");
String DiscountPrice = bundle.getInt("DiscountPrice");
这篇关于ListView的自定义ArrayAdapter和自定义对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
