Как удалить данные списка из sqlite с longclick в listview?

Question

Я хочу, чтобы удалить элемент, где ListView заполняемый из SQLite, используя onLongClick на этом ListView диалогом предупреждения удалить, что пункт

Активность:

public class ResultActivity extends ListActivity { 

    private String selectedItem; 
    private final Context context = this; 
    private ArrayAdapter<String> adapter; 

    Intent intent; 
    TextView Id; 
    SaveData controller = new SaveData(this); 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_result); 


     ArrayList<HashMap<String, String>> hasilList = controller.getAllhasil(); 

     /* jikta tidak kosong, tampilkan data ke ListView 
     * 
     */ 

     if(hasilList.size()!=0) { 

        ListAdapter adapter = new SimpleAdapter(ResultActivity.this, 
          hasilList, R.layout.activity_view, new String[] { 
            "Id", "inggris", "indonesia" }, new int[] { 
            R.id.Id, R.id.inggris, R.id.indonesia }); 
        setListAdapter(adapter); 

        ListView lv = getListView(); 
        // Create the listener for long item clicks 
        // OnItemLongClickListener itemLongListener = new OnItemLongClickListener() { 
        lv.setOnItemLongClickListener(new OnItemLongClickListener() { 

         @Override 
         public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long rowid) { 

          // Id = (TextView) v.findViewById(R.id.Id); 
          // String valId = Id.getText().toString(); 

          // Store selected item in global variable 
          selectedItem = parent.getItemAtPosition(position).toString(); 

          AlertDialog.Builder builder = new AlertDialog.Builder(context); 
          builder.setMessage("Yakin Hapus " + selectedItem + "?"); 
          builder.setCancelable(false); 
          builder.setPositiveButton("Ya", new DialogInterface.OnClickListener() { 

           @Override 
           public void onClick(DialogInterface dialog, int which) { 


            controller.deletehasil(selectedItem); 
            controller.getAllhasil(); 


            // adapter.remove(selectedItem); 
            // adapter.notifyDataSetChanged(); 


            Toast.makeText(
              getApplicationContext(), 
              selectedItem + " Sudah Di Hapus.", 
              Toast.LENGTH_SHORT).show(); 

           } 
          }); 



          builder.setNegativeButton("Tidak", new DialogInterface.OnClickListener() { 

           @Override 
           public void onClick(DialogInterface dialog, int which) { 
            dialog.cancel(); 
           } 
          }); 

          // Create and show the dialog 
          builder.show(); 

          // Signal OK to avoid further processing of the long click 
          return true; 
         } 
        }); 


     } 
       } 



    @Override 
    public void onBackPressed() { 

     super.onBackPressed(); 
     overridePendingTransition(R.anim.fadein, R.anim.fadeout); 
    } 

} 

dbhelper:

public class SaveData extends SQLiteOpenHelper { 

    private static final String LOGCAT = null; 

    public SaveData(Context applicationcontext) { 
     super(applicationcontext, "hasil.db", null, 1); 
     Log.d(LOGCAT,"Created"); 
    } 

    @Override 

    public void onCreate(SQLiteDatabase database) { 
     String query; 
     query = "CREATE TABLE hasil (Id INTEGER PRIMARY KEY," + 
       " inggris TEXT,indonesia TEXT)"; 
     database.execSQL(query); 
     Log.d(LOGCAT,"hasil Created"); 
    } 
    @Override 

    public void onUpgrade(SQLiteDatabase database, int version_old, int current_version) { 
     String query; 
     query = "DROP TABLE IF EXISTS hasil"; 
     database.execSQL(query); 
     onCreate(database); 
    } 

    public void addhasil(HashMap<String, String> queryValues) { 
     SQLiteDatabase database = this.getWritableDatabase(); 
     ContentValues values = new ContentValues(); 
     values.put("inggris", queryValues.get("inggris")); 
     values.put("indonesia", queryValues.get("indonesia")); 
     database.insert("hasil", null, values); 
     database.close(); 
    } 


    public void deletehasil(String id) { 
     Log.d(LOGCAT,"delete"); 
     SQLiteDatabase database = this.getWritableDatabase();  
     String deleteQuery = "DELETE FROM hasil where Id='"+ id +"'"; 
     Log.d("query",deleteQuery);  
     database.execSQL(deleteQuery); 
    } 


    public ArrayList<HashMap<String, String>> getAllhasil() { 
     ArrayList<HashMap<String, String>> hasilList; 
     hasilList = new ArrayList<HashMap<String, String>>(); 
     String selectQuery = "SELECT * FROM hasil"; 
     SQLiteDatabase database = this.getWritableDatabase(); 
     Cursor cursor = database.rawQuery(selectQuery, null); 
     if (cursor.moveToFirst()) { 
      do { 
       HashMap<String, String> map = new HashMap<String, String>(); 
       map.put("Id", cursor.getString(0)); 
       map.put("inggris", cursor.getString(1)); 
       map.put("indonesia", cursor.getString(2)); 
       hasilList.add(map); 
      } while (cursor.moveToNext()); 
     } 

     // return contact list 
     return hasilList; 
    } 

} 

Answer 1

Пожалуйста, ознакомьтесь с нижеследующим кодом слушателя longclick whe re код для удаления комментария элемента доступен.

lv.setOnItemLongClickListener(new OnItemLongClickListener() { 

          @Override 
          public boolean onItemLongClick(AdapterView<?> parent, View v, final int position, long rowid) { 

           // Id = (TextView) v.findViewById(R.id.Id); 
           // String valId = Id.getText().toString(); 

           // Store selected item in global variable 
           selectedItem = parent.getItemAtPosition(position).toString(); 

           AlertDialog.Builder builder = new AlertDialog.Builder(context); 
           builder.setMessage("Yakin Hapus " + selectedItem + "?"); 
           builder.setCancelable(false); 
           builder.setPositiveButton("Ya", new DialogInterface.OnClickListener() { 

            @Override 
            public void onClick(DialogInterface dialog, int which) { 


             controller.deletehasil(selectedItem); 
             controller.getAllhasil(); 

             //------------Code to remove element----------- 
             hasilList.remove(position); 
             adapter.notifyDataSetChanged(); 
             //-------------xxxxxxxxxxxxx------------- 


             Toast.makeText(
               getApplicationContext(), 
               selectedItem + " Sudah Di Hapus.", 
               Toast.LENGTH_SHORT).show(); 

            } 
           }); 



           builder.setNegativeButton("Tidak", new DialogInterface.OnClickListener() { 

            @Override 
            public void onClick(DialogInterface dialog, int which) { 
             dialog.cancel(); 
            } 
           }); 

           // Create and show the dialog 
           builder.show(); 

           // Signal OK to avoid further processing of the long click 
           return true; 
          } 
         });