Android的 - 列表视图中删除项，刷新 [英] Android - Listview delete item and Refresh

问题描述

我想实现的ListView与删除功能从列表视图中删除的项目。我成功了删除，但未能从数据库项目的deletetion之后刷新列表视图。

其实，单击列表项，我展示AlertBox的删除和取消的行动，在点击删除，项目应从数据库中被删除，以及从列表视图和ListView应该被刷新。我也用 notifyDataSetChanged（）方法。

  LVIEW =（ListView控件）findViewById（R.id.lview）;
适配器=新ListView_CustomAdapter（这一点，listitemDisplay）;
lview.setAdapter（适配器）;

lview.setOnItemClickListener（新OnItemClickListener（）
{
     @覆盖
     公共无效onItemClick（适配器视图＆LT;＆gt;一种，视图V，INT位置，长ID）
     {
        Show_Alert_box（v.getContext（），请选择的操作。，位置）;
     }
}）;
 

和$ C $下Show_Alert_box：

 公共无效Show_Alert_box（上下文的背景下，字符串消息，INT位置）
     {
         最终诠释POS =位置;

         最后AlertDialog alertDialog =新AlertDialog.Builder（上下文）.create（）;
            alertDialog.setTitle（的getString（R.string.app_name_for_alert_Dialog））;
            alertDialog.setButton（删除，新DialogInterface.OnClickListener（）{
                公共无效的onClick（DialogInterface对话，诠释它）{

                    尝试
                    {
                        db.open（）;
                                 的String [] whereArgs = {将String.valueOf（PKID）};
        返回db.delete（DATABASE_TABLE_4，pk_pkID ==？，whereArgs）;
                        adapter.notifyDataSetChanged（）;
                        db.close（）;
                    }
                    赶上（例外五）
                    {

                    }
            }}）;
            alertDialog.setButton2（取消，新DialogInterface.OnClickListener（）{
                公共无效的onClick（DialogInterface对话，诠释它）{
                    alertDialog.dismiss（）;
            }}）;

            alertDialog.setMessage（消息）;
            alertDialog.show（）;
     }
 

解决方案

再次致电该活动使用意向

I am trying to implement ListView with Delete functionality to delete item from the listview. I am successful to delete but failed to refresh the listview after deletetion of an item from the database.

Actually, Click on listitem, i am displaying AlertBox for "Delete" and "Cancel" action, on clicking "Delete", item should be removed from the database and as well as from the listview and listview should be refreshed. I have also used notifyDataSetChanged() method.

lview = (ListView) findViewById(R.id.lview);
adapter = new ListView_CustomAdapter(this, listitemDisplay);
lview.setAdapter(adapter);

lview.setOnItemClickListener(new OnItemClickListener() 
{
     @Override
     public void onItemClick(AdapterView<?> a, View v, int position, long id)
     {
        Show_Alert_box(v.getContext(),"Please select action.",position);
     }
});

and the code for Show_Alert_box:

 public void Show_Alert_box(Context context, String message,int position)
     {
         final int pos = position;

         final AlertDialog alertDialog = new  AlertDialog.Builder(context).create();
            alertDialog.setTitle(getString(R.string.app_name_for_alert_Dialog));
            alertDialog.setButton("Delete", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {

                    try
                    {
                        db.open();
                                 String[] whereArgs={String.valueOf(pkID)};
        return db.delete(DATABASE_TABLE_4,"pk_pkID == ?",whereArgs);    
                        adapter.notifyDataSetChanged();
                        db.close();
                    }
                    catch(Exception e)
                    {

                    }
            } }); 
            alertDialog.setButton2("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    alertDialog.dismiss();
            } }); 

            alertDialog.setMessage(message);
            alertDialog.show();
     }

解决方案

Call that Activity once again Using Intent

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