如何把你的AutoCompleteTextView连接到数据库

 AutoCompleteTextView可以根据输入的文字来显示提示, 它的Adapter可以是一个list, 也可以动态的提取数据库数据.
  写了一个例子来展示, 建立一个数据库来储存人名, 只要在AutoCompleteTextView里面输入2个字母就会显示匹配下拉单.
  这是一个定制的CursorAdapter, newView会返回一个包含cursor里文字的view, bindView把cursor的数据绑定在view里, convertToString会把view的数据转换为AutoCompleteTextView显示的文字, runQueryOnBackgroundThread方法会查询数据库.    private class MyCursorAdpter extends CursorAdapter {

        private int columnIndex;

        

        public MyCursorAdpter(Context context, Cursor c, int col) {

            super(context, c);

            this.columnIndex = col;

        }



        @Override

        public View newView(Context context, Cursor cursor, ViewGroup parent) {

            final LayoutInflater inflater = LayoutInflater.from(context);

            final TextView view = (TextView) inflater.inflate(

                    android.R.layout.simple_dropdown_item_1line, parent, false);

            view.setText(cursor.getString(columnIndex));

            return view;

        }



        @Override

        public void bindView(View view, Context context, Cursor cursor) {

            ((TextView) view).setText(cursor.getString(columnIndex));

        }

        

        @Override

        public String convertToString(Cursor cursor) {

            return cursor.getString(columnIndex);

        }



        @Override

        public Cursor runQueryOnBackgroundThread(CharSequence constraint) {

            if (constraint != null) {

                String selection = "name like \'" + constraint.toString() +"%\'";

                return sqlite.query("test", columns, selection, null, null, null, null);

            }

            else {

                return null;

            }

        }

    }
复制代码建立数据库, 以及添加数据, 使用CursorAdapter的数据库必须包含_id项.     private void createDatas() {

        String createTable = "create table test (name varchar(255), _id varchar(255))";

        sqlite.execSQL(createTable);

        

        ContentValues values = new ContentValues();

        values.put("name", "nicole");

        values.put("_id", "0");

        sqlite.insert("test", null, values);

        

        values.put("name", "nicolas");

        values.put("_id", "1");

        sqlite.insert("test", null, values);

        

        values.put("name", "jean");

        values.put("_id", "2");

        sqlite.insert("test", null, values);

        

        values.put("name", "jennyfer");

        values.put("_id", "3");

        sqlite.insert("test", null, values);

    }

 

分享自：http://blog.csdn.net/dearbaba2011/article/details/6927444