android实现搜索功能并将搜索结果保存到SQLite中(实例代码)

运行结果：

涉及要点：

• listview+edittext+scrollview实现搜索效果显示
• 监听软键盘回车执行搜索
• 使用textwatcher( )实时筛选
• 将搜索内容存储到sqlite中（可清空历史记录）
• 监听edittext的焦点，获得焦点弹出软键盘同时显示搜索历史，失去焦点隐藏软件盘和listview。

实现过程比较简单，都是常用的，这里就不讲解了。代码可直接复制使用。

实现过程：

mainactivity.java

public class mainactivity extends activity {

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

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main); 
 initview(); // 初始化控件
 // 清空搜索历史
 tv_clear.setonclicklistener(new view.onclicklistener() {
  @override
  public void onclick(view v) {
  deletedata();
  querydata("");
  }
 });
 
 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
   // 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("");
   }
   toast.maketext(mainactivity.this, "点击软键盘搜索!", toast.length_short).show();
  }
  return false;
  }
 });

 et_search.setonfocuschangelistener(new view.onfocuschangelistener() {
  @override
  public void onfocuschange(view view, boolean b) {
  if (b) { //获得
   scrollview.setvisibility(view.visible);
  } else {//市区焦点
   scrollview.setvisibility(view.gone);
  }
  }
 });

 // 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();
  ((inputmethodmanager) getsystemservice(context.input_method_service)).hidesoftinputfromwindow(
   getcurrentfocus().getwindowtoken(), inputmethodmanager.hide_not_always); //隐藏软键盘
  et_search.clearfocus();
  et_search.settext("");
  }
 });

 // 插入测试数据
 date date = new date();
 long time = date.gettime();
 insertdata("ly" + time);
 querydata(""); // 第一次进入查询所有的历史记录
 }

 /**
 * 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);
 scrollview = findviewbyid(r.id.showsearch);
 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
 }
}

recordsqliteopenhelper.java

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) {

 }
}

mylistview.java

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:focusable="true"
 android:focusableintouchmode="true"
 android:orientation="vertical"
 tools:context=".mainactivity">

 <linearlayout
 android:layout_width="fill_parent"
 android:layout_height="50dp"
 android:background="#be9999"
 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="fill_parent"
  android:layout_weight="264"
  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:id="@+id/showsearch"
 android:layout_width="wrap_content"
 android:layout_height="300dp"
 android:visibility="gone">

 <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" />

  <liyue.edu.cn.ncst.app.mylistview
   android:id="@+id/listview"
   android:layout_width="match_parent"
   android:layout_height="wrap_content" />
  </linearlayout>

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

  <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" />
 </linearlayout>

 </scrollview>

</linearlayout>

完整代码下载 demo

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