根據sqlite結果在列表視圖中區分行

Question

在我的項目中，我需要從webservice和視圖中獲取消息，在listview.I需要區分listview.I中讀取和未讀消息檢索到的消息，並將其存儲在sqlite數據庫中。如何區分讀取和未讀的消息。而且listview沒有正確填充。不是顯示文本，而是顯示textview id在某一行。

這裏是我的代碼，

 public class Message_Adapter extends ArrayAdapter<Message> implements OnClickListener { 
     Activity activity; 
     int layoutResourceId; 
     Message user; 
     ArrayList<Message> data = new ArrayList<Message>(); 

     public Message_Adapter(Activity act, int layoutResourceId, 
      List<Message> data) { 
      super(act, layoutResourceId, data); 
      this.layoutResourceId = layoutResourceId; 
      this.activity = act; 
      this.data = (ArrayList<Message>) data; 
      notifyDataSetChanged(); 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      View row = convertView; 
      UserHolder holder = null; 

      if (row == null) { 
      LayoutInflater inflater = LayoutInflater.from(activity); 

      row = inflater.inflate(layoutResourceId, parent, false); 
      holder = new UserHolder(); 
      holder.fromnum = (TextView) row.findViewById(R.id.fromno); 
      holder.tonum = (TextView) row.findViewById(R.id.tonum); 
      holder.body= (TextView) row.findViewById(R.id.msgbody); 
      holder.date = (TextView) row.findViewById(R.id.msgdate); 
      holder.delete = (Button) row.findViewById(R.id.btn_delete); 
      holder.status = (TextView) row.findViewById(R.id.staty); 
      row.setTag(holder); 
      } else { 
      holder = (UserHolder) row.getTag(); 
      } 
      user = data.get(position); 
      smsm=user.getID(); 
      System.out.println("Smsm::::"+smsm); 
      holder.delete.setTag(user.getID()); 
      holder.fromnum.setText(user.getmsgfrom()); 
      holder.tonum.setText(user.getto()); 
      holder.body.setText(user.getmsg()); 
      holder.date.setText(user.getdate()); 
      holder.status.setText(user.getstatus()); 


      holder.delete.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(final View v) { 
       // TODO Auto-generated method stub 

       // show a message while loader is loading 

       AlertDialog.Builder adb = new AlertDialog.Builder(activity); 
       adb.setTitle("Delete?"); 
       adb.setMessage("Are you sure you want to delete "); 
       //final int user_id = Integer.parseInt(v.getTag().toString()); 
       adb.setNegativeButton("Cancel", null); 
       adb.setPositiveButton("Ok", 
        new AlertDialog.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, 
         int which) { 
         // MyDataObject.remove(positionToRemove); 
         DatabaseHandler dBHandler = new DatabaseHandler(
          activity.getApplicationContext()); 
         dBHandler.Delete_Contact(smsm); 
         InboxActivity.this.onResume(); 

        } 
        }); 
       adb.show(); 
      } 

      }); 
      row.setOnClickListener(new OnItemClickListener(position)); 

      return row; 

     } 

這是我的收件箱中的自定義佈局，

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="100sp" 
android:background="@drawable/edittext" 
android:orientation="vertical" > 
<LinearLayout 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal" > 

<LinearLayout 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/fromno" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="" 
     android:textAppearance="?android:attr/textAppearanceMedium" /> 

    <TextView 
     android:id="@+id/tonum" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/msgbody" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 

    <TextView 
     android:id="@+id/msgdate" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 
    <TextView 
     android:id="@+id/staty" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="" 
     android:textAppearance="?android:attr/textAppearanceSmall" /> 
</LinearLayout> 

<LinearLayout 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:gravity="right" 
     android:orientation="horizontal" > 
    </LinearLayout> 

</LinearLayout> 
</LinearLayout> 

Answer 1

@Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      View row = convertView; 
      UserHolder holder = null; 

     if (row == null) { 
     LayoutInflater inflater = LayoutInflater.from(activity); <== move this line to the constructor of the adapter,and use it as a member 

     row = inflater.inflate(layoutResourceId, parent, false); 
     holder = new UserHolder(); 
     holder.fromnum = (TextView) row.findViewById(R.id.fromno); 
     holder.tonum = (TextView) row.findViewById(R.id.tonum); 
     holder.body= (TextView) row.findViewById(R.id.msgbody); 
     holder.date = (TextView) row.findViewById(R.id.msgdate); 
     holder.delete = (Button) row.findViewById(R.id.btn_delete); 
     holder.status = (TextView) row.findViewById(R.id.staty); 
     row.setTag(holder); 
     } else { 
     holder = (UserHolder) row.getTag(); 
     } 
     user = data.get(position); 
     smsm=user.getID(); 
     System.out.println("Smsm::::"+smsm); 
     holder.delete.setTag(user.getID()); 
     holder.fromnum.setText(user.getmsgfrom()); 
     holder.tonum.setText(user.getto()); 
     holder.body.setText(user.getmsg()); 
     holder.date.setText(user.getdate()); 
     holder.status.setText(user.getstatus()); 


     holder.delete.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(final View v) { 
      // TODO Auto-generated method stub 

      // show a message while loader is loading 

      AlertDialog.Builder adb = new AlertDialog.Builder(activity); 
      adb.setTitle("Delete?"); 
      adb.setMessage("Are you sure you want to delete "); 
      //final int user_id = Integer.parseInt(v.getTag().toString()); 
      adb.setNegativeButton("Cancel", null); 
      adb.setPositiveButton("Ok", 
       new AlertDialog.OnClickListener() { 
       @Override 
       public void onClick(DialogInterface dialog, 
        int which) { 
        // MyDataObject.remove(positionToRemove); 
        DatabaseHandler dBHandler = new DatabaseHandler(
         activity.getApplicationContext()); 
        dBHandler.Delete_Contact(smsm); 
        InboxActivity.this.onResume(); 

       } 
       }); 
      adb.show(); 
     } 

     }); 
     row.setOnClickListener(new OnItemClickListener(position));// do not put onItemClickListener here, it is supposed to go into the activity or fragment whereever your listview object resides, give it "listView.setOnItemClickListener()", it will be noticable in performance when your listview has a lot of rows, that their click listeners get restarted every time you scroll or refresh the list 



      if(Status == 0){ 
    //message is unread 
    }else { 
     // message is read 
} // this status will change whenever you call notifyDataSetChanged on the adapter, because it will refresh all the rows in view 


     return row; 

    }