負載早些時候的消息像什麼應用

當我點擊較早的消息從數據庫中獲得，但列表視圖滾動到頂部未完成，該消息應該只裝載在列表視圖的頂部沒有加載負荷早些時候的消息其滾動。負載早些時候的消息像什麼應用

這裏是我的主要活動

protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
       WindowManager.LayoutParams.FLAG_FULLSCREEN); 
     setContentView(R.layout.private_group_chat); 

    Intent i = getIntent(); 
    btnLoadMore = new Button(this); 
    btnLoadMore.setText("Load Earlier Messages"); 
    lsvChat = (ListView) findViewById(R.id.lv_messsages); 
    lsvChat.addHeaderView(btnLoadMore); 
    chatModel = new ArrayList<ChatModel>(); 
    db = new Database3(getApplicationContext()); 
    chatModel = db.getSelectedIncidentDetails(getApplicationContext(), 
      groupId, count); 
    chatAdapter = new ChatAdapterGroup(getApplicationContext(), chatModel); 
    lsvChat.setAdapter(chatAdapter); 
    discoverModel = new ArrayList<DiscoverModel>(); 
    dm = new DiscoverModel(); 

}

這裏是我的基本適配器的代碼......

public class ChatAdapterGroup extends BaseAdapter { 

    private Context context; 
    private LayoutInflater inflater; 
    int count = 0; 
    private ArrayList<ChatModel> list; 

    public ChatAdapterGroup(Context context, ArrayList<ChatModel> list) { 
     this.context = context; 
     this.list = list; 

     inflater = (LayoutInflater) context 
       .getSystemService(context.LAYOUT_INFLATER_SERVICE); 
    } 

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

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

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

    private class ViewHolder { 
     TextView txt_left; 
     TextView txt_right; 
     TextView tv_fromName; 
     RelativeLayout rl_left; 
     RelativeLayout rl_right; 
    } 

    @Override 
    public View getView(final int position, View v, ViewGroup arg2) { 

     final ViewHolder holder; 
     if (v == null) { 

      holder = new ViewHolder(); 
      v = inflater.inflate(R.layout.chat_adapter, null); 

      holder.txt_left = (TextView) v.findViewById(R.id.txt_left); 

      holder.txt_right = (TextView) v.findViewById(R.id.txt_right); 

      holder.tv_fromName = (TextView) v.findViewById(R.id.tv_fromName); 

      holder.rl_left = (RelativeLayout) v.findViewById(R.id.rl_left); 

      holder.rl_right = (RelativeLayout) v.findViewById(R.id.rl_right); 

      v.setTag(holder); 

     } else { 
      holder = (ViewHolder) v.getTag(); 

     } 

     if (list.get(position) != null) { 

      if (list.get(position).getGroup_cordinate() 
        .equalsIgnoreCase("left")) { 
       holder.txt_left.setText("" 
         + list.get(position).getGroup_messages_recive()); 
       holder.tv_fromName.setText("" 
         + list.get(position).getFrom_name_recive()); 
       holder.txt_left.setTextColor(Color.parseColor("#000000")); 
       holder.rl_right.setVisibility(View.GONE); 
       holder.rl_left.setVisibility(View.VISIBLE); 
      } else { 
       holder.txt_right.setText("" 
         + list.get(position).getGroup_messages_recive()); 
       holder.rl_left.setVisibility(View.GONE); 
       holder.rl_right.setVisibility(View.VISIBLE); 

      } 

     } 

     v.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       // notifyDataSetChanged(); 
      } 
     }); 
     return v; 
    } 

}

和列表視圖中的XML編碼....... ......

<ListView 
     android:id="@+id/lv_messsages" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_above="@+id/ll_send" 
     android:layout_below="@+id/rl_header" 
     android:divider="@null" 
     android:stackFromBottom="true" 
     android:transcriptMode="alwaysScroll" />

來源

2016-01-04 Nikhil Singh

你只需要一個該被稱爲「加載更多」的說法。並將其添加爲列表視圖的標題，並在其點擊數據庫中獲取數據並使用notifyDatsetChanged（）。而已。

LayoutInflater inflater = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE); 
convertViewHeader = inflater.inflate(R.layout.row_idea_list , null); 
convertViewHeader.setBackgroundColor(getResources().getColor(R.color.gray_light_light)); 

listView.addHeaderView(convertViewHeader, null, false);

設置onclickListener這個convertView並加載在其點擊更多的數據。

來源

2016-01-04 09:58:58 ADM

負載早些時候的消息像什麼應用

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