如何使用来自其他活动的自定义适配器更新列表视图？

我正在制作消息应用程序。到目前为止，一切都很好，但是我还没有想出如何在新消息从另一个活动到达时更新列表视图。我希望这样，如果消息到达，如果用户在消息屏幕上，它将更新列表视图以显示新消息。如何使用来自其他活动的自定义适配器更新列表视图？

事实上，用户必须重新打开应用程序才能查看新消息。我想弄清楚现在如何自动刷新或更新当前的列表视图。

我MessageAdapter如下：

public class MessageAdapter extends BaseAdapter { 
// This is the custom adapter for displaying the labdetails in listview of a 
// dialog inside the activity 
String picsDownloadFolder = Environment.getExternalStorageDirectory() + "/" 
     + "Congress" + "/", imageLinkBuilder; 
private Activity activity; 

private LayoutInflater inflater = null; 
private List<MessageModel> data; 
int myPosition; 
int totalNumAttackers = 0, totalNumDamage = 0; 
public Boolean bb[]; 
int element; 
DbUtils dbutil; 

File LocImageFile; 
WindowManager.LayoutParams WMLP; 
List<UserModel> notificationList = new ArrayList<UserModel>(); 

public MessageAdapter(Activity a, List<MessageModel> notifyList) { 

    activity = a; 

    inflater = (LayoutInflater) activity 
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    dbutil = new DbUtils(); 
    // notificationList = notifyList; 
    data = notifyList; 

} 

@Override 
public int getCount() { 
    // TODO Auto-generated method stub 
    return data.size(); 
} 

@Override 
public Object getItem(int position) { 
    // TODO Auto-generated method stub 
    return position; 
} 

@Override 
public long getItemId(int position) { 
    // TODO Auto-generated method stub 
    return position; 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    // TODO Auto-generated method stub 

    ViewHolder viewHolder; 
MessageModel array = data.get(position); 
    if (convertView == null) { 
     viewHolder = new ViewHolder(); 
     convertView = inflater.inflate(R.layout.message_item, null); 
     viewHolder.left =(LinearLayout)convertView.findViewById(R.id.left); 
     viewHolder.right =(LinearLayout)convertView.findViewById(R.id.right); 
     viewHolder.txt1 = (TextView) convertView 
       .findViewById(R.id.textView1); 
     viewHolder.txt3 = (TextView) convertView 
       .findViewById(R.id.textView3); 
     viewHolder.txt2 = (TextView) convertView 
       .findViewById(R.id.textView2); 
     viewHolder.txt4 = (TextView) convertView 
       .findViewById(R.id.textView4); 

     convertView.setTag(viewHolder); 


    } else { 
     // prevent recycling of views 
     viewHolder = (ViewHolder) convertView.getTag(); 
    } 
    if (array.gettype().equals("received")) { 
     viewHolder.right.setVisibility(View.INVISIBLE); 
     viewHolder.left.setVisibility(View.VISIBLE); 
     viewHolder.txt1.setText(array.getmsg()); 
     viewHolder.txt3.setText(array.getdate()); 
    } if (array.gettype().equals("sent")) { 
     viewHolder.left.setVisibility(View.INVISIBLE); 
     viewHolder.right.setVisibility(View.VISIBLE); 
     viewHolder.txt2.setText(array.getmsg()); 
     viewHolder.txt4.setText(array.getdate()); 
    } 

    return convertView; 
} 

// view holder class 
public static class ViewHolder { 

LinearLayout left,right; 
TextView txt1,txt3,txt2,txt4; 

} 

}

我已经尝试使用：

mListView.setAdapter(mAdapter);

但它一直强制关闭应用程序。

来源

2014-11-07 steven

呼叫

mAdapter.notifyDataSetChanged();

来源

2014-11-07 02:39:36 WoookLiu

如何使用来自其他活动的自定义适配器更新列表视图？

回答

相关问题