刪除零的索引列表視圖中，從數據庫的Android

Question

我的數據庫類是這樣的，當我打電話deleteEntry，它不會刪除0指數，這是數據庫類方法填充

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; 
    } 

這是我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

你可以嘗試這樣的：

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

順便說一句，確保「時間」是你的表名，你也關閉數據庫。

Answer 2

嘗試傳球的位置，而不是一個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); 
} 

嘗試此操作後，請查看所獲得的日誌，並嘗試確定哪個值（id或位置）更好。無論如何，我想你應該存儲你在某個地方顯示的每個項目的數據庫ID，這樣你就不會只依賴列表中的位置（一旦從你的表中刪除任何項目，這將不起作用），因爲ID會不是順序的。

Answer 3

這裏是我做過什麼 認爲我有兩個表等動態列表視圖兩個項目（即自定義適配器）

我刪除的名字物品（你可以選擇的項目的名稱位置

Yourlist.setOnItemLongClickListener（新OnItemLongClickListener（）{@覆蓋公共布爾onItemLongClick（適配器視圖爲arg0，查看ARG1，INT ARG2，長ID）{

字符串str = Yourlist.getItemAtPosition（ARG2）的ToString（） ;

//考慮我有兩個表

//創建一個名爲feedslist了一個名爲 「URL」，其中項目（供稿網址），將存儲

mydb.execSQL列的表格（「CREATE TABLE IF NOT EXISTS feedslist（id INTEGER PRIMARY KEY AUTOINCREMENT，url varchar）;「）;

//創建一個名爲其中項目（供稿名）將存儲

mydb.execSQL 「名稱」 列的表稱爲字幕列表（「CREATE TABLE IF NOT EXISTS subtitleslist（ID INTEGER PRIMARY KEY AUTOINCREMENT ，name varchar）;「）;

//這是刪除條目 alert.setPositiveButton（R.string.deleteok，新DialogInterface.OnClickListener方法（）{

                    @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); 

  

您可以在這裏看到

工作程序

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