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
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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) {
}
}
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mainactivity.java
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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
}
}
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mylistview.java
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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);
}
}
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activity_main.xml
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<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>
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以上就是本文的全部内容，希望对大家的学习有所帮助。