Comment fadeout en-tête dans la vue liste comme WhatsApp

Question

Je veux fondre un premier en-tête visible dans un stickyheaderlistview (lib). Comment puis-je fader le premier en-tête visible dans une vue de liste. s'il vous plaît donnez-moi un exemple. Je vous remercie. si vous observez l'en-tête de date cachera s'il n'y a pas d'interaction utilisateur après un certain temps

Answer 1

Compile ceci:

compile 'se.emilsjolander:stickylistheaders:2.1.3' 

Dans votre adaptateur

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 quelque chose comme:

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

Je pense que vous devriez essayer ObservableScrollView.

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