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);

}

转载自：http://www.javaxxz.com/read.php?tid=6537