Wie Header in der Listenansicht auszublenden wie WhatsApp

Question

Ich möchte einen ersten sichtbaren Header in einem stickyheaderlistview (lib) ausblenden. Wie blende ich den ersten sichtbaren Header in einer Listenansicht aus. Bitte gib mir ein Beispiel. Danke. wenn Sie das Datum Header beobachten wird es verstecken, wenn es keine Interaktion mit dem Benutzer nach einiger Zeit ist

Answer 1

Compile dies:

compile 'se.emilsjolander:stickylistheaders:2.1.3' 

In Ihrem Adapter

public class ChatAdapter extends BaseAdapter implements StickyListHeadersAdapter { 

    private Activity mActivity; 
    private SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); 
    private SimpleDateFormat dateformat = new SimpleDateFormat("hh:mm a"); 
    private SimpleDateFormat format1 = new SimpleDateFormat("ddMMyyyy"); 
    private SimpleDateFormat headerdateformat = new SimpleDateFormat("dd MMMM yyyy"); 
    private Date date = null; 
    private String msgDate = ""; 
    private Date headerDate = null; 
    private String msgHeader = ""; 
    private String msg = ""; 
    private String mName = ""; 
    private int day = 0; 
List<GroupChatHistoryData> mChatArrayList = new ArrayList<>(); 

    public ChatAdapter(Activity mActivity,List<GroupChatHistoryData> mChatArrayList) { 
     this.mActivity = mActivity; 
this.mChatArrayList = mChatArrayList; 
    } 

    @Override 
    public int getCount() { 
     return mChatArrayList.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return mChatArrayList.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     final ViewHolder holder; 

     if (convertView == null) { 

      LayoutInflater inflater = (LayoutInflater) mActivity. 
        getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      /****** Inflate tabitem.xml file for each row (Defined below) *******/ 
      convertView = inflater.inflate(R.layout.chat_details_row_item, null); 

      holder = new ViewHolder(); 

      holder.receive_message_text = (TextView) convertView.findViewById(R.id.receive_message_text); 
      holder.receive_message_date = (TextView) convertView.findViewById(R.id.receive_message_date); 
      holder.receive_member_name = (TextView) convertView.findViewById(R.id.receive_member_name); 
      holder.sent_message_date = (TextView) convertView.findViewById(R.id.sent_message_date); 
      holder.sent_message_text = (TextView) convertView.findViewById(R.id.sent_message_text); 

      holder.chat_receive_layout = (LinearLayout) convertView.findViewById(R.id.chat_receive_layout); 
      holder.sent_msg_ll = (LinearLayout) convertView.findViewById(R.id.sent_msg_ll); 

      convertView.setTag(holder); 
     } else { 
      holder = (ViewHolder) convertView.getTag(); 
     } 

     final GroupChatHistoryData bean = mChatArrayList.get(position); 

     try { 
      if (bean.getTime() != null && !bean.getTime().equalsIgnoreCase("")) { 
       date = format.parse(bean.getTime()); 
      } 
     } catch (ParseException e) { 
      e.printStackTrace(); 
     } 
     if (date != null) { 
      msgDate = dateformat.format(date); 
     } 

     msg = bean.getMessage(); 


// your rest views 

     return convertView; 
    } 


    @Override 
    public View getHeaderView(int position, View convertView, ViewGroup parent) { 
     final HeaderViewHolder holder; 
     LayoutInflater inflater = LayoutInflater.from(mActivity); 
     if (convertView == null) { 
      convertView = inflater.inflate(R.layout.chat_header, parent, false); 
      holder = new HeaderViewHolder(); 

      holder.headerDate = (TextView) convertView.findViewById(R.id.header_date); 

      convertView.setTag(holder); 

     } else { 
      holder = (HeaderViewHolder) convertView.getTag(); 
     } 

     GroupChatHistoryData bean = mChatArrayList.get(position); 

     try { 
      if (bean.getDatetime() != null && !bean.getDatetime().equalsIgnoreCase("")) { 
       headerDate = format1.parse(bean.getDatetime()); 
      } 
     } catch (ParseException e) { 
      e.printStackTrace(); 
     } 

     if (headerDate != null) { 
      msgHeader = headerdateformat.format(headerDate); 
     } 

     if (show(msgHeader) == 0) { 
      holder.headerDate.setText("TODAY"); 
     } else if (show(msgHeader) == -1) { 
      holder.headerDate.setText("YESTERDAY"); 
     } else { 
      holder.headerDate.setText(msgHeader); 
     } 

     return convertView; 
    } 

    private class HeaderViewHolder { 
     private TextView headerDate; 
    } 

    @Override 
    public long getHeaderId(int position) { 
     String mDate = mChatArrayList.get(position).getDatetime(); 
     int mDatePos = Integer.parseInt(mDate); 
     return mDatePos; 
    } 

    private class ViewHolder { 
     TextView receive_message_text; 
     TextView receive_message_date; 
     TextView receive_member_name; 
     TextView sent_message_date; 
     TextView sent_message_text; 

     LinearLayout chat_receive_layout; 
     LinearLayout sent_msg_ll; 
    } 

    private int show(String time) { 
     try { 
      String outputPattern = "dd MMMM yyyy"; 
      SimpleDateFormat format = new SimpleDateFormat(outputPattern); 

      Date Date1 = format.parse(getdate()); 
      Date Date2 = format.parse(time); 
      long mills = Date2.getTime() - Date1.getTime(); 
      long Day1 = mills/(1000 * 60 * 60); 

      day = (int) Day1/24; 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return day; 
    } 


    private String getdate() { 
     String time = ""; 
     try { 
      String outputPattern = "dd MMMM yyyy"; 

      Calendar c = Calendar.getInstance(); 
      SimpleDateFormat df = new SimpleDateFormat(outputPattern); 
      time = df.format(c.getTime()); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return time; 
    } 

} 

chat_header.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_margin="10dp"> 

     <TextView 
      android:id="@+id/header_date" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_centerInParent="true" 
      android:background="#BDD9E4" 
      android:gravity="center" 
      android:padding="10dp" 
      android:textAllCaps="true" 
      android:textSize="12sp" 
      android:textColor="@color/gray" 
      android:textStyle="bold" /> 

    </RelativeLayout> 

</RelativeLayout> 

GroupChatHistoryData Bean etwas wie dieses:

public class GroupChatHistoryData { 


    private SimpleDateFormat headerdateformat = new SimpleDateFormat("ddMMyyyy"); 
    private Date headerDate = null; 
    private Date mTime = null; 
    private SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); 
    private SimpleDateFormat timeformat = new SimpleDateFormat("hh:mm a"); 

    @SerializedName("user_id") 
    @Expose 
    private String userId; 
    @SerializedName("group_id") 
    @Expose 
    private String groupId; 
    @SerializedName("message") 
    @Expose 
    private String message; 
    @SerializedName("datetime") 
    @Expose 
    private String datetime; 
    @SerializedName("fname") 
    @Expose 
    private String fname; 
    @SerializedName("time") 
    @Expose 
    private String time; 

    public String getUserId() { 
     return userId; 
    } 

    public void setUserId(String userId) { 
     this.userId = userId; 
    } 

    public String getGroupId() { 
     return groupId; 
    } 

    public void setGroupId(String groupId) { 
     this.groupId = groupId; 
    } 

    public String getMessage() { 
     return message; 
    } 

    public void setMessage(String message) { 
     this.message = message; 
    } 

    public String getDatetime() { 

     String date = ""; 
     try { 
      if (datetime != null && !datetime.equalsIgnoreCase("")) { 
       headerDate = format.parse(datetime); 
      } 
     } catch (ParseException e) { 
      e.printStackTrace(); 
     } 
     if (headerDate != null) { 
      date = headerdateformat.format(headerDate); 
     } 

     return date; 
    } 

    public void setDatetime(String datetime) { 
     this.datetime = datetime; 
    } 

    public String getFname() { 
     return fname; 
    } 

    public void setFname(String fname) { 
     this.fname = fname; 
    } 


    public boolean isMine() { 
     return isMine; 
    } 

    public void setMine(boolean mine) { 
     isMine = mine; 
    } 

    public boolean isMine = false; 

    public String getTime() { 

     return time; 
    } 

    public void setTime(String time) { 
     this.time = time; 
    } 

} 

Answer 2

Ich denke, Sie sollten ObservableScrollView versuchen.

https://github.com/ksoichiro/Android-ObservableScrollView