我想编辑ListView中的项目。怎么做？

Question

我想编辑列表视图中的项目。（该编辑选项应仅对一个用户可用）。 怎么做？ 有人可以帮我吗？

我已经创建了一个列表视图以在其中添加项目。

public class DatabaseHelper extends SQLiteOpenHelper {

    public static final String DATABASE_NAME = "users.db";
    public static final String TABLE_NAME = "users_data";
    public static final String COL1 = "ID";
    public static final String ROW2 = "FIRSTNAME";
    public static final String COL3 = "LASTNAME";
    public static final String COL4 = "FAVFOOD";


    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
                " FIRSTNAME TEXT, LASTNAME TEXT, FAVFOOD TEXT)";
        db.execSQL(createTable);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP IF TABLE EXISTS " + TABLE_NAME);
        onCreate(db);
    }

    public boolean addData(String fName, String lName, String fFood) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(ROW2, fName);
        contentValues.put(COL3, lName);
        contentValues.put(COL4, fFood);

        long result = db.insert(TABLE_NAME, null, contentValues);

        //if date as inserted incorrectly it will return -1
        if (result == -1) {
            return false;
        } else {
            return true;
        }
    }

    //query for 1 week repeats
    public Cursor getListContents() {
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor data = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
        return data;
    }
}

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public class ViewListContents extends AppCompatActivity {

    DatabaseHelper myDB;
    ArrayList<User> userList;
    ListView listView;
    User user;

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

        myDB = new DatabaseHelper(this);

        userList = new ArrayList<>();
        Cursor data = myDB.getListContents();
        int numRows = data.getCount();
        if(numRows == 0){
            Toast.makeText(ViewListContents.this,"The Database is empty  :(.",Toast.LENGTH_LONG).show();
        }else{
            int i=0;
            while(data.moveToNext()){
                user = new User("Name       - "+data.getString(1),"Mail:id      - "+data.getString(2),"Mobile no. - "+data.getString(3));
                userList.add(i,user);
                System.out.println(data.getString(1)+" "+data.getString(2)+" "+data.getString(3));
                System.out.println(userList.get(i).getFirstName());
                i++;
            }
            ThreeColumn_ListAdapter adapter =  new ThreeColumn_ListAdapter(this,R.layout.list_adapter_view, userList);
            listView = (ListView) findViewById(R.id.listView);
            listView.setAdapter(adapter);
        }
    }
}


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public class ThreeColumn_ListAdapter extends ArrayAdapter<User> {

    private LayoutInflater mInflater;
    private ArrayList<User> users;
    private int mViewResourceId;

    public ThreeColumn_ListAdapter(Context context, int textViewResourceId, ArrayList<User> users) {
        super(context, textViewResourceId, users);
        this.users = users;
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mViewResourceId = textViewResourceId;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        convertView = mInflater.inflate(mViewResourceId, null);

        User user = users.get(position);

        if (user != null) {
            TextView firstName = (TextView) convertView.findViewById(R.id.textFirstName);
            TextView lastName = (TextView) convertView.findViewById(R.id.textLastName);
            TextView favFood = (TextView) convertView.findViewById(R.id.textFavFood);
            if (firstName != null) {
                firstName.setText(user.getFirstName());
            }
            if (lastName != null) {
                lastName.setText((user.getLastName()));
            }
            if (favFood != null) {
                favFood.setText((user.getFavFood()));
            }
        }

        return convertView;
    }


}