我有一个物化日历，其中包含几天的某些事件。 所有这些事件也列在列表视图中。 如果我点击了日历上的特定日期，我就是这么做的 然后，如果列表视图的项目中有此日期，那么该项目将在列表视图中排在第一位。 日历和列表视图都处于不同的活动中。所以我保存点击日期并将其转移到其他活动中：
materialCalendarView.setOnDateChangedListener(new OnDateSelectedListener() {
@Override
public void onDateSelected(@NonNull MaterialCalendarView widget, @NonNull CalendarDay date, boolean selected) {
Date dt=date.getDate();
String str1=String.valueOf(timeZoneFormat.format(dt));
Intent i = new Intent(MainActivity.this, CalendarList.class);
i.putExtra("datec",str1);
startActivity(i);
// close this activity
finish();
}
});
并在其他活动中得到它：
Intent i = getIntent();
i.getData();
date2 = i.getStringExtra("datec");
And my listview is display using this code:
caladata();
calList = new ArrayList < > ();
adapter = new CalendarListAdapter(this, calList);
listView.setAdapter(adapter);
private void caladata() {
// showing refresh animation before making http call
swipeRefreshLayout.setRefreshing(false);
// Volley's json array request object
StringRequest stringRequest = new StringRequest(Request.Method.POST, CALENDAR_DATA,
new Response.Listener < String > () {
@Override
public void onResponse(String response) {
// Log.d(TAG, response.toString());
// hidePDialog();
JSONObject object = null;
try {
object = new JSONObject(response);
} catch (JSONException e) {
e.printStackTrace();
}
JSONArray jsonarray = null;
try {
jsonarray = object.getJSONArray("Table");
} catch (JSONException e) {
e.printStackTrace();
}
for (int i = 0; i < jsonarray.length(); i++) {
try {
JSONObject obj = jsonarray.getJSONObject(i);
Calenndar_Model movie = new Calenndar_Model();
String str = obj.getString("eventdate").replaceAll("\\D+","");
String upToNCharacters = str.substring(0, Math.min(str.length(), 13));
DateFormat timeZoneFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
timeZoneFormat.setTimeZone(TimeZone.getTimeZone("GMT-8"));
Date time = new Date(Long.parseLong(upToNCharacters));
movie.setDate(String.valueOf(timeZoneFormat.format(time)));
movie.setColor(obj.getString("eventcolor"));
movie.setAutoid(obj.getString("autoid"));
// Toast.makeText(getApplicationContext(), "server data respone", Toast.LENGTH_LONG).show();
if (date2.equals(time)){
// adding movie to movies array
calList.add(0,movie);
} calList.add(movie);
// Toast.makeText(getApplicationContext(), "server data respone", Toast.LENGTH_LONG).show();
} catch (JSONException e) {
// Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}) {
@Override
protected Map < String, String > getParams() {
Map < String, String > params = new HashMap < String, String > ();
params.put("clientid", get1);
return params;
}
};
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(stringRequest);
}
我的适配器代码：
public class CalendarListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Calenndar_Model> movieList;
private String[] bgColors;
public CalendarListAdapter(Activity activity, List<Calenndar_Model> movieList) {
this.activity = activity;
this.movieList = movieList;
}
@Override
public int getCount() {
return movieList.size();
}
@Override
public Object getItem(int location) {
return movieList.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.calendar_listrow, null);
ImageView serial = (ImageView) convertView.findViewById(R.id.serial);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView date1 = (TextView) convertView.findViewById(R.id.date1);
title.setText(movieList.get(position).getHost());
date1.setText(movieList.get(position).getDate());
return convertView;
}
}
因此，如何更新此代码以在列表视图顶部显示单击日期（项目）。
请指导。
答案 0 :(得分：0)
您可以headerView添加ListView ..
View header = getLayoutInflater().inflate(R.layout.header, null);
listView.addHeaderView(header);
最后将适配器设置为列表视图。
listView.setAdapter(youradapter);
答案 1 :(得分：0)
我认为您希望在列表顶部显示所选日期，而列表视图仍需要滚动。
您编写的上述代码会将所选日期置于最前面，但已排序的行为将受到影响。
更好的解决方案是按原样添加列表中的项目，然后滚动到特定的选定日期。
在遍历表的for循环中，添加以下代码。
selectedItemPos = 0;
if (date2.equals(time)) {
selectedItemPos = i;
}
刷新列表视图后。使用以下方法滚动到selectedPos。
getListView().smoothScrollToPositionFromTop(position,offset,duration);
<强>参数
selectedPos）修改
您需要更新的部分代码。请参阅功能caladata（）中的更新行。 listview在这种情况下需要是最终的。
for (int i = 0; i < jsonarray.length(); i++) {
try {
JSONObject obj = jsonarray.getJSONObject(i);
Calenndar_Model movie = new Calenndar_Model();
String str = obj.getString("eventdate").replaceAll("\\D+","");
String upToNCharacters = str.substring(0, Math.min(str.length(), 13));
DateFormat timeZoneFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss"); timeZoneFormat.setTimeZone(TimeZone.getTimeZone("GMT-8"));
Date time = new Date(Long.parseLong(upToNCharacters));
movie.setDate(String.valueOf(timeZoneFormat.format(time)));
movie.setColor(obj.getString("eventcolor"));
movie.setAutoid(obj.getString("autoid"));
// **Code updated**
selectedPos = 0;
if (date2.equals(time)){
selectedItemPos = i;
}
// Toast.makeText(getApplicationContext(), "server data respone", Toast.LENGTH_LONG).show();
} catch (JSONException e) {
// Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
adapter.notifyDataSetChanged();
// **Code updated**
listview..smoothScrollToPositionFromTop(selectedPos,0,300);
我认为这会有所帮助。快乐编码
答案 2 :(得分：0)
将以下代码放在Adapter中，并从适配器实例中调用此方法。如果您不清楚，请粘贴您的适配器代码并让我帮助您。
public void swapList(List<Object> objectList) {
this.objectList = objectList;
notifyDataSetChanged();
}
更新了适配器类：
public class CalendarListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Calenndar_Model> movieList;
private String[] bgColors;
public CalendarListAdapter(Activity activity, List<Calenndar_Model> movieList) {
this.activity = activity;
this.movieList = movieList;
}
public void swapList(List<Calenndar_Model> movieList) {
this.movieList = movieList;
notifyDataSetChanged();
}
@Override
public int getCount() {
return movieList.size();
}
@Override
public Object getItem(int location) {
return movieList.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.calendar_listrow, null);
ImageView serial = (ImageView) convertView.findViewById(R.id.serial);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView date1 = (TextView) convertView.findViewById(R.id.date1);
title.setText(movieList.get(position).getHost());
date1.setText(movieList.get(position).getDate());
return convertView;
}
}
在calList中更改/排序后，使用此代码刷新列表。
adapter.swapList(calList);