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) { }} |
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 }} |
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); }} |
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> |
以上就是本文的全部内容，希望对大家的学习有所帮助。
