大家好我还在学习安卓系统，这是我第一次使用改造来从服务器填充列表来构建列表。我没有收到任何错误，应用程序没有崩溃，我的日志显示我从服务器接收数据。
我的适用于列表视图的适配器：
public class TransactionsAdapter extends BaseAdapter {
ArrayList<Transactions> transactions;
public TransactionsAdapter(ArrayList<Transactions> transactions) {
this.transactions=transactions;
}
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view=null;
ViewHolder viewHolder = null;
if(convertView == null)
{
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.izvjestaji_item,parent,false);
viewHolder = new ViewHolder(view);
view.setTag(viewHolder);
}
else{
view = convertView;
viewHolder= (ViewHolder) view.getTag();
}
Transactions transactions = (Transactions) getItem(position);
if(transactions != null) {
viewHolder.datum.setText(transactions.getPurchaseDate());
viewHolder.partner.setText(transactions.getMerchantName());
viewHolder.iznos.setText(transactions.getTransactionMoneyAmount().toString());
viewHolder.brojbodova.setText(transactions.getSalesAmount().toString());
}
return view;
}
private class ViewHolder{
TextView datum;
TextView partner;
TextView iznos;
TextView brojbodova;
public ViewHolder(View view) {
this.datum = (TextView) view.findViewById(R.id.izvjestaji_datum);
this.partner = (TextView) view.findViewById(R.id.izvjestaji_partner);
this.iznos = (TextView) view.findViewById(R.id.izvjestaji_iznos);
this.brojbodova=(TextView)view.findViewById(R.id.izvjestaji_brojbodova);
}
}
}
通过jsonschema2pojo.org生成服务器返回的模型
import javax.annotation.Generated;
@Generated("org.jsonschema2pojo")
public class Transactions {
private Integer Id;
private String PurchaseDate;
private Integer Month;
private Integer Year;
private Double SalesAmount;
private Object SpecialSalesActionId;
private Integer PosTerminalId;
private Integer CardId;
private String MerchantName;
private Integer TransactionPointsAmount;
private Double TransactionMoneyAmount;
private Boolean IsDeleted;
private Boolean IsVoucher;
private Integer LoyaltyLevel;
private Integer CategoryId;
private Object CardNo;
private Integer MerchantId;
/**
*
* @return
* The Id
*/
public Integer getId() {
return Id;
}
/**
*
* @param Id
* The Id
*/
public void setId(Integer Id) {
this.Id = Id;
}
/**
*
* @return
* The PurchaseDate
*/
public String getPurchaseDate() {
return PurchaseDate;
}
/**
*
* @param PurchaseDate
* The PurchaseDate
*/
public void setPurchaseDate(String PurchaseDate) {
this.PurchaseDate = PurchaseDate;
}
/**
*
* @return
* The Month
*/
public Integer getMonth() {
return Month;
}
/**
*
* @param Month
* The Month
*/
public void setMonth(Integer Month) {
this.Month = Month;
}
/**
*
* @return
* The Year
*/
public Integer getYear() {
return Year;
}
/**
*
* @param Year
* The Year
*/
public void setYear(Integer Year) {
this.Year = Year;
}
/**
*
* @return
* The SalesAmount
*/
public Double getSalesAmount() {
return SalesAmount;
}
/**
*
* @param SalesAmount
* The SalesAmount
*/
public void setSalesAmount(Double SalesAmount) {
this.SalesAmount = SalesAmount;
}
/**
*
* @return
* The SpecialSalesActionId
*/
public Object getSpecialSalesActionId() {
return SpecialSalesActionId;
}
/**
*
* @param SpecialSalesActionId
* The SpecialSalesActionId
*/
public void setSpecialSalesActionId(Object SpecialSalesActionId) {
this.SpecialSalesActionId = SpecialSalesActionId;
}
/**
*
* @return
* The PosTerminalId
*/
public Integer getPosTerminalId() {
return PosTerminalId;
}
/**
*
* @param PosTerminalId
* The PosTerminalId
*/
public void setPosTerminalId(Integer PosTerminalId) {
this.PosTerminalId = PosTerminalId;
}
/**
*
* @return
* The CardId
*/
public Integer getCardId() {
return CardId;
}
/**
*
* @param CardId
* The CardId
*/
public void setCardId(Integer CardId) {
this.CardId = CardId;
}
/**
*
* @return
* The MerchantName
*/
public String getMerchantName() {
return MerchantName;
}
/**
*
* @param MerchantName
* The MerchantName
*/
public void setMerchantName(String MerchantName) {
this.MerchantName = MerchantName;
}
/**
*
* @return
* The TransactionPointsAmount
*/
public Integer getTransactionPointsAmount() {
return TransactionPointsAmount;
}
/**
*
* @param TransactionPointsAmount
* The TransactionPointsAmount
*/
public void setTransactionPointsAmount(Integer TransactionPointsAmount) {
this.TransactionPointsAmount = TransactionPointsAmount;
}
/**
*
* @return
* The TransactionMoneyAmount
*/
public Double getTransactionMoneyAmount() {
return TransactionMoneyAmount;
}
/**
*
* @param TransactionMoneyAmount
* The TransactionMoneyAmount
*/
public void setTransactionMoneyAmount(Double TransactionMoneyAmount) {
this.TransactionMoneyAmount = TransactionMoneyAmount;
}
/**
*
* @return
* The IsDeleted
*/
public Boolean getIsDeleted() {
return IsDeleted;
}
/**
*
* @param IsDeleted
* The IsDeleted
*/
public void setIsDeleted(Boolean IsDeleted) {
this.IsDeleted = IsDeleted;
}
/**
*
* @return
* The IsVoucher
*/
public Boolean getIsVoucher() {
return IsVoucher;
}
/**
*
* @param IsVoucher
* The IsVoucher
*/
public void setIsVoucher(Boolean IsVoucher) {
this.IsVoucher = IsVoucher;
}
/**
*
* @return
* The LoyaltyLevel
*/
public Integer getLoyaltyLevel() {
return LoyaltyLevel;
}
/**
*
* @param LoyaltyLevel
* The LoyaltyLevel
*/
public void setLoyaltyLevel(Integer LoyaltyLevel) {
this.LoyaltyLevel = LoyaltyLevel;
}
/**
*
* @return
* The CategoryId
*/
public Integer getCategoryId() {
return CategoryId;
}
/**
*
* @param CategoryId
* The CategoryId
*/
public void setCategoryId(Integer CategoryId) {
this.CategoryId = CategoryId;
}
/**
*
* @return
* The CardNo
*/
public Object getCardNo() {
return CardNo;
}
/**
*
* @param CardNo
* The CardNo
*/
public void setCardNo(Object CardNo) {
this.CardNo = CardNo;
}
/**
*
* @return
* The MerchantId
*/
public Integer getMerchantId() {
return MerchantId;
}
/**
*
* @param MerchantId
* The MerchantId
*/
public void setMerchantId(Integer MerchantId) {
this.MerchantId = MerchantId;
}
}
要包含列表的片段：
public class Izvjestaji extends Fragment {
ListView list;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
// Defines the xml file for the fragment
return inflater.inflate(R.layout.izvjestaji, parent, false);
}
// This event is triggered soon after onCreateView().
// Any view setup should occur here. E.g., view lookups and attaching view listeners.
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
list=(ListView)view.findViewById(R.id.izvjestaji_list);
showList();
// Setup any handles to view objects here
// EditText etFoo = (EditText) view.findViewById(R.id.etFoo);
}
public void showList(){
NetworkSDK.getInstance().getTransactions(new Callback<List<Transactions>>() {
@Override
public void onResponse(Call<List<Transactions>> call, Response<List<Transactions>> response) {
if(response.isSuccess()){
Log.d("Data", String.valueOf(response.isSuccess()));
TransactionsAdapter transactionsAdapter=new TransactionsAdapter((ArrayList<Transactions>)response.body());
list.setAdapter(transactionsAdapter);
}
}
@Override
public void onFailure(Call<List<Transactions>> call, Throwable t) {
Log.d("Error","Def error");
}
});
}
}
2个xml文件（一个来自片段，另一个是列表中的单个项目） 片段布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/izvjestaji_list" />
</LinearLayout>
Item_Layout：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Datum"
android:id="@+id/izvjestaji_datum"
android:gravity="center"
android:background="#a9a8a8"
android:layout_weight="1"
android:textSize="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/izvjestaji_partner"
android:text="Partner"
android:gravity="center"
android:background="#a9a8a8"
android:layout_weight="1"
android:textSize="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/izvjestaji_iznos"
android:text="Iznos"
android:background="#a9a8a8"
android:gravity="center"
android:layout_weight="1"
android:textSize="20dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/izvjestaji_brojbodova"
android:text="Broj Bodova"
android:gravity="center"
android:background="#a9a8a8"
android:layout_weight="1"
android:textSize="20dp" />
</LinearLayout>
在我的预览中，我只获得空片段
答案 0 :(得分：0)
更改为
@Override
public int getCount() {
return transactions.size();
}
@Override
public Object getItem(int position) {
return transactions.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
答案 1 :(得分：0)
在TransactionAdapter课程中，您尚未实施覆盖方法
使用这些
@Override
public int getCount() {
return transactions.size();
}
@Override
public Object getItem(int position) {
return transactions.get(position);
}
@Override
public long getItemId(int position) {
return position;
}