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

易采站长站为您分析Android AutoCompleteTextView连接数据库自动提示的方法,结合实例形式分析了AutoCompleteTextView操作数据库的原理与具体技巧,并附带demo源码供读者下载参考,需要的朋友可以参考下  

本文实例讲述了Android AutoCompleteTextView连接数据库自动提示的方法。，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;
  }
}

								 
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