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。

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