我尝试将一系列日期及其详细信息放在片段中的列表视图中。但是，当我运行应用程序时，根本没有列表视图，只显示文本视图区域。文本视图用于测试，详细信息是正确的。
我认为这个
有些问题> MyAdapter myAdapter=new MyAdapter(fragTable.this.getActivity(),R.layout.list_view_item,listofDates);
lv.setAdapter(myAdapter);
或
//To get dates between 2 Dates (dates)
while (cal.getTime().before(stringToDaTe(mdateTo))) {
cal.add(Calendar.DATE, 1);
dates.add(datetoString(cal.getTime()));
}
fragTable.java
/**
* A simple {@link Fragment} subclass.
* Use the {@link fragTable#newInstance} factory method to
* create an instance of this fragment.
*/
public class fragTable extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_LOCNAME = "param1";
private static final String ARG_LATI = "param2";
private static final String ARG_LONGI = "param3";
private static final String ARG_TIMEZONE = "param4";
private static final String ARG_DATEFROM = "param5";
private static final String ARG_DATETO = "param6";
// TODO: Rename and change types of parameters
private String mlocName;
private Double mLati;
private Double mLongi;
private String mtimeZone;
private String mdateFrom;
private String mdateTo;
ListView lv;
ArrayList<RSDate> listofDates = new ArrayList<>();
public fragTable() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment fragTable.
*/
// TODO: Rename and change types and number of parameters
public static fragTable newInstance(String locName, double lati, double longi, String timeZone, String datefrom, String dateto) {
fragTable fragment = new fragTable();
Bundle args = new Bundle();
args.putString(ARG_LOCNAME, locName);
args.putDouble(ARG_LATI,lati);
args.putDouble(ARG_LONGI,longi);
args.putString(ARG_TIMEZONE, timeZone);
args.putString(ARG_DATEFROM,datefrom);
args.putString(ARG_DATETO,dateto);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mlocName = getArguments().getString(ARG_LOCNAME);
mLati = getArguments().getDouble(ARG_LATI);
mLongi = getArguments().getDouble(ARG_LONGI);
mtimeZone = getArguments().getString(ARG_TIMEZONE);
mdateFrom = getArguments().getString(ARG_DATEFROM);
mdateTo = getArguments().getString(ARG_DATETO);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_frag_table, container, false);
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
TextView tv = view.findViewById(R.id.test);
Integer daysBetween = getDays(mdateFrom,mdateTo);
TimeZone tz = TimeZone.getTimeZone(mtimeZone);
GeoLocation geolocation = new GeoLocation(mlocName, mLati, mLongi, tz);
AstronomicalCalendar ac = new AstronomicalCalendar(geolocation);
tv.setText(mlocName+" "+mLati+" "+mLongi+" "+mtimeZone+" "+ mdateFrom+" to " + mdateTo +" = " +daysBetween
+"------------"+getSunRiseTime(ac,stringToDaTe(mdateFrom))+"------------"+getSunSetTime(ac,stringToDaTe(mdateFrom)));
//Table
List<String> dates = new ArrayList<String>();
Calendar cal = Calendar.getInstance();
cal.setTime(stringToDaTe(mdateFrom));
//To get dates between 2 Dates (dates)
while (cal.getTime().before(stringToDaTe(mdateTo))) {
cal.add(Calendar.DATE, 1);
dates.add(datetoString(cal.getTime()));
}
// add to listofDates(RSDate) - dates+ details
for(String date: dates)
{
String clone1= getSunRiseTime(ac,stringToDaTe(date));
String clone2= getSunSetTime(ac,stringToDaTe(date));
listofDates.add(new RSDate(date,clone1,clone2));
}
lv = view.findViewById(R.id.listOfDate);
MyAdapter myAdapter=new MyAdapter(fragTable.this.getActivity(),R.layout.list_view_item,listofDates);
lv.setAdapter(myAdapter);
}
public String getSunRiseTime(AstronomicalCalendar ac, Date date)
{
String result="";
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH);
int day = cal.get(Calendar.DAY_OF_MONTH);
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
ac.getCalendar().set(year, month, day);
result = sdf.format(ac.getSunrise());
return result;
}
public String getSunSetTime(AstronomicalCalendar ac,Date date)
{
String result="";
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH);
int day = cal.get(Calendar.DAY_OF_MONTH);
SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
ac.getCalendar().set(year, month, day);
result = sdf.format(ac.getSunset());
return result;
}
/**Change from string to date*/
public Date stringToDaTe(String dateString)
{
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
Date date = new Date();
try {
date = sdf.parse(dateString);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
public String datetoString(Date date)
{
SimpleDateFormat df = new SimpleDateFormat("dd-MM-yyyy");
Date today = Calendar.getInstance().getTime();
String result = df.format(today);
return result;
}
/**Calculate Days between two days using Joda Library*/
public int getDays(String dateFrom, String dateTo)
{
int result;
java.util.Date date1 = stringToDaTe(dateFrom);
DateTime dateTime1 = new DateTime(date1);
java.util.Date date2 = stringToDaTe(dateTo);
DateTime dateTime2 = new DateTime(date2);
result = Days.daysBetween(dateTime1, dateTime2).getDays();
return result;
}
}
MyAdapter.java
public class MyAdapter extends ArrayAdapter<RSDate> {
ArrayList<RSDate> dateList = new ArrayList<>();
public MyAdapter(Context context, int textViewResourceId, ArrayList<RSDate> objects) {
super(context, textViewResourceId, objects);
dateList = objects;
}
@Override
public int getCount() {
return super.getCount();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.list_view_item, null);
TextView dateView = (TextView) v.findViewById(R.id.listView_Date);
TextView srtView = (TextView) v.findViewById(R.id.listView_sunrise);
TextView sstView = (TextView) v.findViewById(R.id.listView_sunset);
dateView.setText(dateList.get(position).getDates());
srtView.setText(dateList.get(position).getSunRiseTime());
sstView.setText(dateList.get(position).getSunSetTime());
return v;
}
}
fragment_frag_table.xml
<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"
android:orientation="vertical"
tools:context="com.example.davenguyen.a08suncalculator.fragChooseRange">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="@+id/test"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
<ListView
android:id="@+id/listOfDate"
android:background="@color/colorAccent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:divider="@color/colorAccent"
android:dividerHeight="2dp"></ListView>
答案 0 :(得分：2)
@Override
public int getCount() {
return super.getCount();
}
这将是0，您想要使用自己数据的计数：
@Override
public int getCount() {
return dateList.size();
}
另外，尝试替换
v = inflater.inflate(R.layout.list_view_item, null);
带
v = inflater.inflate(R.layout.list_view_item, parent, false);
另外：检查ListView上Fragment是否正确显示，以缩小适配器或布局上的问题范围。