Question

我的数据库类是这样的，当我调用deleteEntry时，它不会删除0索引，这是数据库类方法

public int deleteEntry(String id)
    {
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        //String id=String.valueOf(ID);
        String where="ID=?";

        int numberOFEntriesDeleted= db.delete("TIME", where, new String[]{id}) ;
        Toast.makeText(context, "Number of Entry Deleted Successfully : "+numberOFEntriesDeleted, Toast.LENGTH_LONG).show();
        return numberOFEntriesDeleted;
    }

这是我的onItemClickListener

list_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Log.d("Clicked item id", " " + id);

               // data.remove(id);
                String row = (String.valueOf(id));
                data.deleteEntry(row);

Answer 1

尝试传递位置而不是id：

list_view.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        Log.d("Clicked item id", " " + id);
        Log.d("Clicked item position", " " + position);
        String row = (String.valueOf(position)); // the change is here
        data.deleteEntry(row);
}

尝试此操作后，查看您获得的日志，并尝试确定哪个值（ID或位置）更好。无论如何，我想你应该存储你在某处显示的每个项目的数据库ID，这样你就不会只依赖列表中的位置（一旦从表中删除任何项目，这将无效），因为ID＆＃ 39; s不会顺序。

Answer 2

您可以尝试这样：

//---deletes a particular entry---
public int deleteEntry(String id) 
{
    SQLiteDatabase db = dbHelper.getWritableDatabase();
    return db.delete("TIME", "ID = " + id, null) ;
}

顺便说一句，确保＆＃34; TIME＆＃34;是你的表名，你也关闭了数据库。

Answer 3

这就是我所做的考虑我有两个表，所以动态列表视图有两个项目（即使用自定义适配器）

我按名称删除项目（您可以在位置

获取所选项目的名称

Yourlist.setOnItemLongClickListener（new OnItemLongClickListener（）{@Override public boolean onItemLongClick（AdapterView arg0，View arg1，int arg2，long id）{

String str = Yourlist.getItemAtPosition（arg2）.toString（）;

//考虑我有两张桌子

//创建一个名为feedslist的表，其中包含一个名为“url”的列，其中将存储项目（feed url）

mydb.execSQL（“CREATE TABLE IF NOT EXISTS feedslist（id INTEGER PRIMARY KEY AUTOINCREMENT，url varchar）;”）;

//创建一个名为字幕列表的表，其中包含一个名为“name”的列，其中将存储项目（提要名称）

mydb.execSQL（“CREATE TABLE IF NOT EXISTS subtitleslist（id INTEGER PRIMARY KEY AUTOINCREMENT，name varchar）;”）;

//这是删除条目的方法 alert.setPositiveButton（R.string.deleteok，new DialogInterface.OnClickListener（）{

                    @Override

                    public void onClick(DialogInterface dialog, int which) {


                        //on positive click we delete the feed from selected position


                        //we're gonna delete them from the db



                        //using cursor 

                        Cursor cursor =mydb.rawQuery("SELECT * FROM feedslist;", null);

                        Cursor cursor2 =mydb.rawQuery("SELECT * FROM subtitleslist;", null);


                        String url = "";

                        String name = "";


                        //set url

                        if (cursor != null && cursor.moveToFirst()) {


                            while (!cursor.isAfterLast()) {


                                //we get items at selected position

                                url = mItems.get(datposition);

                                cursor.moveToNext();

                            }

                            cursor.close();

                        }


                        //set feed name

                        if (cursor2 != null && cursor2.moveToFirst()) {


                            while (!cursor2.isAfterLast()) {


                                //we get items at selected position

                                name = mItems2.get(datposition);

                                cursor2.moveToNext();

                            }

                            cursor2.close();

                        }


                        //set the names of the two tables

                        String table1 = "feedslist";

                        String table2 = "subtitleslist";


                        //set where clause

                        String whereClause_url = "url" + "=?";

                        String whereClause_feed = "name" + "=?";


                        //set the where arguments

                        String[] whereArgs_url = new String[] { String.valueOf(url) };

                        String[] whereArgs_name = new String[] { String.valueOf(name) };


                        //delete 'em all

                        mydb.delete(table1, whereClause_url, whereArgs_url);

                        mydb.delete(table2, whereClause_feed, whereArgs_name);


                        //remove items from the dynamic listview


                        //for url

                        mItems.remove(datposition);


                        //for feed name

                        mItems2.remove(datposition);


                        //and update the dynamic list

                        //don't move this method above the db deletion method or

                        //you'll get javalangindexoutofboundsexception-invalid-index error

                        adapter_dynamic.notifyDataSetChanged();

                        adapter_dynamic.notifyDataSetInvalidated();

                        listfeed.setAdapter(adapter_dynamic);

您可以在此处查看工作应用

https://github.com/enricocid/iven-feed-reader

删除从数据库Android填充的listview的零索引

3 个答案: