Question

我有一个baseAdapter类，可以将数据添加到Gridview。请问有没有办法在列表添加到适配器之前对其进行排序？

Comm_AppsList=new ArrayList<Appis_Infos>();
    Comm_AppsList.add(new Appis_Infos(BitmapFactory.decodeResource(com_res, R.drawable.skype), "Skype","com.skype.raider"));
    Comm_AppsList.add(new Appis_Infos(BitmapFactory.decodeResource(com_res, R.drawable.yahoomessenger),"Messenger","com.yahoo.mobile.client.android.im"));
    Comm_AppsList.add(new Appis_Infos(BitmapFactory.decodeResource(com_res, R.drawable.whatsappm),"WhatsApp","com.whatsapp"));
    Comm_AppsList.add(new Appis_Infos(BitmapFactory.decodeResource(com_res, R.drawable.yahoomail),"Mail","com.yahoo.mobile.client.android.mail"));

  Com_gridview.setAdapter(new CommAppis_Adapter(this, Comm_AppsList));

这是BaseAdapter

   class CommAppis_Adapter extends BaseAdapter{
private Context AIcontext;
private List<Appis_Infos>AdList;

CommAppis_Adapter(Context Aicontext, List<Appis_Infos> aDlist){
AIcontext=Aicontext;
AdList=aDlist;
}

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

@Override
public Object getItem(int it_position) {
    // TODO Auto-generated method stub
    return AdList.get(it_position);
}

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

@Override
public View getView(int Vposition, View Aview, ViewGroup Vparent) {
    // TODO Auto-generated method stub
    Appis_Infos appsData=AdList.get(Vposition);
    Comm_Viewholder holder=null;

    if(Aview==null){
        LayoutInflater apps_inflater=LayoutInflater.from(AIcontext);
        Aview=apps_inflater.inflate(R.layout.comm_appis, null);
        holder=new Comm_Viewholder();

        holder.apps_icons=(ImageView)Aview.findViewById(R.id.comm_imageview);
        holder.apps_name=(TextView)Aview.findViewById(R.id.comm_tvName);


        Aview.setTag(holder);
    }else{
        holder=(Comm_Viewholder)Aview.getTag();
    }

    holder.apps_icons.setImageBitmap(appsData.getIcon());
    holder.apps_name.setText(appsData.getName());

    return Aview;
}

}

在添加之前，请如何排序（以编程方式，因为我的列表很长。我只是把它弄坏了）这些项目。

Answer 1

首先，您可以定义自己的Comparator对象：

Comparator<Appis_Infos> myComparator = new Comparator<Appis_Infos>() {
    public int compare(Appis_Infos obj1,Appis_Infos obj2) {
        return obj1.getName().compareTo(obj2.getName());
    }
 };

然后调用Collections.sort方法：

Collections.sort(Comm_AppsList, myComparator);

如果您需要在不变模式下进行比较，请使用 compareToIgnoreCase 方法而不是 compareTo 。

如何在setAdapter之前在BaseAdapter中对项目进行排序？

1 个答案: