Android实现搜索功能并本地保存搜索历史记录

本文实例为大家分享了android实现搜索功能，并且需要显示搜索的历史记录，供大家参考，具体内容如下

效果图：

本案例实现起来很简单，所以可以直接拿来嵌入项目中使用，涉及到的知识点：
- 数据库的增删改查操作
- listview和scrollview的嵌套冲突解决
- 监听软键盘回车按钮设置为搜索按钮
- 使用textwatcher( )实时筛选
- 已搜索的关键字再次搜索不重复添加到数据库
- 刚进入页面设置软键盘不因为edittext而自动弹出

代码

recordsqliteopenhelper.java

package com.cwvs.microlife;

import android.content.context;
import android.database.sqlite.sqlitedatabase;
import android.database.sqlite.sqliteopenhelper;

public class recordsqliteopenhelper extends sqliteopenhelper {

  private static string name = "temp.db";
  private static integer version = 1;

  public recordsqliteopenhelper(context context) {
    super(context, name, null, version);
  }

  @override
  public void oncreate(sqlitedatabase db) {
    db.execsql("create table records(id integer primary key autoincrement,name varchar(200))");
  }

  @override
  public void onupgrade(sqlitedatabase db, int oldversion, int newversion) {

  }


}

mainactivity.java

package com.cwvs.microlife;

import java.util.date;

import android.app.activity;
import android.content.context;
import android.database.cursor;
import android.database.sqlite.sqlitedatabase;
import android.graphics.drawable.drawable;
import android.os.bundle;
import android.text.editable;
import android.text.textwatcher;
import android.view.keyevent;
import android.view.view;
import android.view.window;
import android.view.inputmethod.inputmethodmanager;
import android.widget.adapterview;
import android.widget.baseadapter;
import android.widget.cursoradapter;
import android.widget.edittext;
import android.widget.simplecursoradapter;
import android.widget.textview;
import android.widget.toast;

public class mainactivity extends activity {

  private edittext et_search;
  private textview tv_tip;
  private mylistview listview;
  private textview tv_clear;
  private recordsqliteopenhelper helper = new recordsqliteopenhelper(this);;
  private sqlitedatabase db;
  private baseadapter adapter;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    requestwindowfeature(window.feature_no_title);
    setcontentview(r.layout.activity_main);
    // 初始化控件
    initview();

    // 清空搜索历史
    tv_clear.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        deletedata();
        querydata("");
      }
    });

    // 搜索框的键盘搜索键点击回调
    et_search.setonkeylistener(new view.onkeylistener() {// 输入完后按键盘上的搜索键

      public boolean onkey(view v, int keycode, keyevent event) {
        if (keycode == keyevent.keycode_enter && event.getaction() == keyevent.action_down) {// 修改回车键功能
          // 先隐藏键盘
          ((inputmethodmanager) getsystemservice(context.input_method_service)).hidesoftinputfromwindow(
              getcurrentfocus().getwindowtoken(), inputmethodmanager.hide_not_always);
          // 按完搜索键后将当前查询的关键字保存起来,如果该关键字已经存在就不执行保存
          boolean hasdata = hasdata(et_search.gettext().tostring().trim());
          if (!hasdata) {
            insertdata(et_search.gettext().tostring().trim());
            querydata("");
          }
          // todo 根据输入的内容模糊查询商品，并跳转到另一个界面，由你自己去实现
          toast.maketext(mainactivity.this, "clicked!", toast.length_short).show();

        }
        return false;
      }
    });

    // 搜索框的文本变化实时监听
    et_search.addtextchangedlistener(new textwatcher() {
      @override
      public void beforetextchanged(charsequence s, int start, int count, int after) {

      }

      @override
      public void ontextchanged(charsequence s, int start, int before, int count) {

      }

      @override
      public void aftertextchanged(editable s) {
        if (s.tostring().trim().length() == 0) {
          tv_tip.settext("搜索历史");
        } else {
          tv_tip.settext("搜索结果");
        }
        string tempname = et_search.gettext().tostring();
        // 根据tempname去模糊查询数据库中有没有数据
        querydata(tempname);

      }
    });

    listview.setonitemclicklistener(new adapterview.onitemclicklistener() {
      @override
      public void onitemclick(adapterview<?> parent, view view, int position, long id) {
        textview textview = (textview) view.findviewbyid(android.r.id.text1);
        string name = textview.gettext().tostring();
        et_search.settext(name);
        toast.maketext(mainactivity.this, name, toast.length_short).show();
        // todo 获取到item上面的文字，根据该关键字跳转到另一个页面查询，由你自己去实现
      }
    });

    // 插入数据，便于测试，否则第一次进入没有数据怎么测试呀？
    date date = new date();
    long time = date.gettime();
    insertdata("leo" + time);

    // 第一次进入查询所有的历史记录
    querydata("");
  }

  /**
   * 插入数据
   */
  private void insertdata(string tempname) {
    db = helper.getwritabledatabase();
    db.execsql("insert into records(name) values('" + tempname + "')");
    db.close();
  }

  /**
   * 模糊查询数据
   */
  private void querydata(string tempname) {
    cursor cursor = helper.getreadabledatabase().rawquery(
        "select id as _id,name from records where name like '%" + tempname + "%' order by id desc ", null);
    // 创建adapter适配器对象
    adapter = new simplecursoradapter(this, android.r.layout.simple_list_item_1, cursor, new string[] { "name" },
        new int[] { android.r.id.text1 }, cursoradapter.flag_register_content_observer);
    // 设置适配器
    listview.setadapter(adapter);
    adapter.notifydatasetchanged();
  }
  /**
   * 检查数据库中是否已经有该条记录
   */
  private boolean hasdata(string tempname) {
    cursor cursor = helper.getreadabledatabase().rawquery(
        "select id as _id,name from records where name =?", new string[]{tempname});
    //判断是否有下一个
    return cursor.movetonext();
  }

  /**
   * 清空数据
   */
  private void deletedata() {
    db = helper.getwritabledatabase();
    db.execsql("delete from records");
    db.close();
  }

  private void initview() {
    et_search = (edittext) findviewbyid(r.id.et_search);
    tv_tip = (textview) findviewbyid(r.id.tv_tip);
    listview = (com.cwvs.microlife.mylistview) findviewbyid(r.id.listview);
    tv_clear = (textview) findviewbyid(r.id.tv_clear);

    // 调整edittext左边的搜索按钮的大小
    drawable drawable = getresources().getdrawable(r.drawable.search);
    drawable.setbounds(0, 0, 60, 60);// 第一0是距左边距离，第二0是距上边距离，60分别是长宽
    et_search.setcompounddrawables(drawable, null, null, null);// 只放左边
  }
}

mylistview.java

package com.cwvs.microlife;

import android.content.context;
import android.util.attributeset;
import android.widget.listview;

public class mylistview extends listview {
  public mylistview(context context) {
    super(context);
  }

  public mylistview(context context, attributeset attrs) {
    super(context, attrs);
  }

  public mylistview(context context, attributeset attrs, int defstyle) {
    super(context, attrs, defstyle);
  }

  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    int expandspec = measurespec.makemeasurespec(integer.max_value >> 2,
        measurespec.at_most);
    super.onmeasure(widthmeasurespec, expandspec);
  }

}

activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:focusableintouchmode="true"
  android:orientation="vertical"
  tools:context="${relativepackage}.${activityclass}">

  <linearlayout
    android:layout_width="fill_parent"
    android:layout_height="50dp"
    android:background="#e54141"
    android:orientation="horizontal"
    android:paddingright="16dp">

    <imageview
      android:layout_width="45dp"
      android:layout_height="45dp"
      android:layout_gravity="center_vertical"
      android:padding="10dp"
      android:src="@drawable/back" />

    <edittext
      android:id="@+id/et_search"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:background="@null"
      android:drawableleft="@drawable/search"
      android:drawablepadding="8dp"
      android:gravity="start|center_vertical"
      android:hint="输入查询的关键字"
      android:imeoptions="actionsearch"
      android:singleline="true"
      android:textcolor="@android:color/white"
      android:textsize="16sp" />

  </linearlayout>


  <scrollview
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <linearlayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical">

      <linearlayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingleft="20dp"

        >

        <textview
          android:id="@+id/tv_tip"
          android:layout_width="match_parent"
          android:layout_height="50dp"
          android:gravity="left|center_vertical"
          android:text="搜索历史" />

        <view
          android:layout_width="match_parent"
          android:layout_height="1dp"
          android:background="#eeeeee"></view>

        <com.cwvs.microlife.mylistview
          android:id="@+id/listview"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"></com.cwvs.microlife.mylistview>


      </linearlayout>

      <view
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#eeeeee"></view>

      <textview
        android:id="@+id/tv_clear"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="#f6f6f6"
        android:gravity="center"
        android:text="清除搜索历史" />

      <view
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginbottom="20dp"
        android:background="#eeeeee"></view>
    </linearlayout>

  </scrollview>
</linearlayout>

以上就是本文的全部内容，希望对大家的学习有所帮助。