本文实例讲述了android autocompletetextview连接数据库自动提示的方法。分享给大家供大家参考，具体如下：
这个简单例子也体现mvc的思想。autocompletetextview 就是view，而simplecursoradapter就是controller，sqliteopenhelper就相当于model。
1、首先定义mvc中的model，自定义dbhelper类继承sqliteopenhelper用于访问数据库
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import android.content.context;import android.database.cursor;import android.database.sqlite.sqlitedatabase;import android.database.sqlite.sqliteopenhelper;/** * * @author lai_zs * @date：2012-2-16 下午4:16:02 */public class dbhelper extends sqliteopenhelper { private static final int database_version = 1; private static final string database_name = "autocomplete.db"; // 根据name自动查询 public static final string name = "name"; public dbhelper(context context) { super(context, database_name, null, database_version); } @override public void oncreate(sqlitedatabase db) { string sqlstring = "createtable test (_id integer primary key autoincrement,name varchat(20) not null onconflict fail)"; db.execsql(sqlstring); // 初始数据库表 string[] namestrarraystr = new string[] { "aaa", "abc", "cde", "中国", "美女", "提示" }; for (int i = 0; i < namestrarraystr.length; i++) { db.execsql("insert intotest(" + name + ")values(?)",new object[] { namestrarraystr[i] }); } } @override public void onupgrade(sqlitedatabase arg0, int arg1, int arg2) { // do nothing here } /** * 根据输入内容模糊查询 * @param name * @return */ public cursor query(string name) { sqlitedatabase db = this.getreadabledatabase(); return db.rawquery("select* from test where name like '%" + name + "%' limit 10",null); }} |
2、定义autocompleteadater继承simplecursoradapter控制数据交互
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import android.content.context;import android.database.cursor;import android.widget.simplecursoradapter;/** * * @author lai_zs * @date：2012-2-16 下午3:49:25 */public class autocompleteadater extends simplecursoradapter { private dbhelper dbhelper = null; private context context; // 查询字段 private string queryfield; public autocompleteadater(context context, int layout, cursor c,string from, int to) { super(context, layout, c, new string[] { from },new int[] { to }); this.context = context; this.queryfield = from; } /** * 动态查询数据库 */ @override public cursor runqueryonbackgroundthread(charsequenceconstraint) { if (constraint != null) { return getdbhelper().query((string) constraint); } else { return null; } } /** * 这里设置在弹出的提示列表中点击某一项后的返回值,返回值将被显示在文本框中 */ @override public charsequence converttostring(cursor cursor) { return cursor.getstring(cursor.getcolumnindex(queryfield)); } public dbhelper getdbhelper() { if (dbhelper == null) { dbhelper = new dbhelper(this.context); } return dbhelper; }} |
3、最后定义view
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<autocompletetextview android:id="@+id/autocompletetextview1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="" android:hint="@string/dbautocomlete" > <requestfocus /></autocompletetextview> |
4、在activity中关联view和adapter
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@overridepublic void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); autocompleteadatercursoradapter = new autocompleteadater(this, android.r.layout.simple_dropdown_item_1line,null, dbhelper.name, android.r.id.text1); // 设置输入一个字符就弹出提示列表(默认输入两个字符时才弹出提示) ((autocompletetextview) this.findviewbyid(r.id.autocompletetextview1)).setthreshold(1); ((autocompletetextview) this.findviewbyid(r.id.autocompletetextview1)).setadapter(cursoradapter);} |
完整实例代码点击此处本站下载。
希望本文所述对大家android程序设计有所帮助。
