Android AutoCompleteTextView连接数据库自动提示的方法(附demo源码下载)

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

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

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

<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

@override
public 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。

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希望本文所述对大家android程序设计有所帮助。