search history

package com.rain.search;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

package com.rain.search;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * Created by Carson_Ho on 16/11/15.
 */
//SQLiteOpenHelper子類用于打開數(shù)據(jù)庫并進(jìn)行對(duì)用戶搜索歷史記錄進(jìn)行增刪減除的操作
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) {
        //打開數(shù)據(jù)庫，建立了一個(gè)叫records的表，里面只有一列name來存儲(chǔ)歷史記錄：
        db.execSQL("create table records(id integer primary key autoincrement,name varchar(200))");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}


package com.rain.search;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

/**
 * Created by Carson_Ho on 16/11/15.
 */
//解決ListView和ScrollView的沖突
public class Search_Listview extends ListView {
    public Search_Listview(Context context) {
        super(context);
    }

    public Search_Listview(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public Search_Listview(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    //通過復(fù)寫其onMeasure方法、達(dá)到對(duì)ScrollView適配的效果

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }

}

package com.rain.search;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by Carson_Ho on 16/11/15.
 */
public class Search_View extends LinearLayout {

    private Context context;

    /*UI組件*/
    private TextView tv_clear;
    private EditText et_search;
    private TextView tv_tip;
    private ImageView iv_search;

    /*列表及其適配器*/
    private Search_Listview listView;
    private BaseAdapter adapter;

    /*數(shù)據(jù)庫變量*/
    private RecordSQLiteOpenHelper helper ;
    private SQLiteDatabase db;


    /*三個(gè)構(gòu)造函數(shù)*/
    //在構(gòu)造函數(shù)里直接對(duì)搜索框進(jìn)行初始化 - init()
    public Search_View(Context context) {
        super(context);
        this.context = context;
        init();
    }

    public Search_View(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        init();
    }

    public Search_View(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context = context;
        init();
    }


    /*初始化搜索框*/
    private void init(){

        //初始化UI組件
        initView();


        //實(shí)例化數(shù)據(jù)庫SQLiteOpenHelper子類對(duì)象
        helper = new RecordSQLiteOpenHelper(context);

        // 第一次進(jìn)入時(shí)查詢所有的歷史記錄
        queryData("");

        //"清空搜索歷史"按鈕
        tv_clear.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                //清空數(shù)據(jù)庫
                deleteData();
                queryData("");
            }
        });

        //搜索框的文本變化實(shí)時(shí)監(jiān)聽
        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) {

            }

            //輸入后調(diào)用該方法
            @Override
            public void afterTextChanged(Editable s) {

                if (s.toString().trim().length() == 0) {
                    //若搜索框?yàn)榭?則模糊搜索空字符,即顯示所有的搜索歷史
                    tv_tip.setText("搜索歷史");
                } else {
                    tv_tip.setText("搜索結(jié)果");
                }

                //每次輸入后都查詢數(shù)據(jù)庫并顯示
                //根據(jù)輸入的值去模糊查詢數(shù)據(jù)庫中有沒有數(shù)據(jù)
                String tempName = et_search.getText().toString();
                queryData(tempName);

            }
        });


        // 搜索框的鍵盤搜索鍵
        // 點(diǎn)擊回調(diào)
        et_search.setOnKeyListener(new OnKeyListener() {// 輸入完后按鍵盤上的搜索鍵


            // 修改回車鍵功能
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {
                    // 隱藏鍵盤，這里getCurrentFocus()需要傳入Activity對(duì)象，如果實(shí)際不需要的話就不用隱藏鍵盤了，免得傳入Activity對(duì)象，這里就先不實(shí)現(xiàn)了
//                    ((InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(
//                            getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);

                    // 按完搜索鍵后將當(dāng)前查詢的關(guān)鍵字保存起來,如果該關(guān)鍵字已經(jīng)存在就不執(zhí)行保存
                    boolean hasData = hasData(et_search.getText().toString().trim());
                    if (!hasData) {
                        insertData(et_search.getText().toString().trim());

                        queryData("");
                    }
                    //根據(jù)輸入的內(nèi)容模糊查詢商品，并跳轉(zhuǎn)到另一個(gè)界面，這個(gè)需要根據(jù)需求實(shí)現(xiàn)
                    Toast.makeText(context, "點(diǎn)擊搜索", Toast.LENGTH_SHORT).show();

                }
                return false;
            }
        });



        //列表監(jiān)聽
        //即當(dāng)用戶點(diǎn)擊搜索歷史里的字段后,會(huì)直接將結(jié)果當(dāng)作搜索字段進(jìn)行搜索
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                //獲取到用戶點(diǎn)擊列表里的文字,并自動(dòng)填充到搜索框內(nèi)
                TextView textView = (TextView) view.findViewById(android.R.id.text1);
                String name = textView.getText().toString();
                et_search.setText(name);
                Toast.makeText(context, name, Toast.LENGTH_SHORT).show();

            }
        });

//        // 插入數(shù)據(jù)，便于測(cè)試，否則第一次進(jìn)入沒有數(shù)據(jù)怎么測(cè)試呀？
//        Date date = new Date();
//        long time = date.getTime();
//        insertData("Leo" + time);

        //點(diǎn)擊搜索按鈕后的事件
        iv_search.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                boolean hasData = hasData(et_search.getText().toString().trim());
                if (!hasData) {
                    insertData(et_search.getText().toString().trim());

                    //搜索后顯示數(shù)據(jù)庫里所有搜索歷史是為了測(cè)試
                    queryData("");
                }
                //根據(jù)輸入的內(nèi)容模糊查詢商品，并跳轉(zhuǎn)到另一個(gè)界面，這個(gè)根據(jù)需求實(shí)現(xiàn)
                Toast.makeText(context, "clicked!", Toast.LENGTH_SHORT).show();
            }
        });




    }





    /**
     * 封裝的函數(shù)
     */

    /*初始化組件*/
    private void initView(){
        LayoutInflater.from(context).inflate(R.layout.search_layout,this);
        et_search = (EditText) findViewById(R.id.et_search);
        tv_clear = (TextView) findViewById(R.id.tv_clear);
        tv_tip = (TextView) findViewById(R.id.tv_tip);
        listView = (Search_Listview) findViewById(R.id.listView);
        iv_search = (ImageView) findViewById(R.id.iv_search);
    }

    /*插入數(shù)據(jù)*/
    private void insertData(String tempName) {
        db = helper.getWritableDatabase();
        db.execSQL("insert into records(name) values('" + tempName + "')");
        db.close();
    }

    /*模糊查詢數(shù)據(jù) 并顯示在ListView列表上*/
    private void queryData(String tempName) {

        //模糊搜索
        Cursor cursor = helper.getReadableDatabase().rawQuery(
                "select id as _id,name from records where name like '%" + tempName + "%' order by id desc ", null);
        // 創(chuàng)建adapter適配器對(duì)象,裝入模糊搜索的結(jié)果
        adapter = new SimpleCursorAdapter(context, android.R.layout.simple_list_item_1, cursor, new String[] { "name" },
                new int[] { android.R.id.text1 }, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
        // 設(shè)置適配器
        listView.setAdapter(adapter);
        adapter.notifyDataSetChanged();
    }

    /*檢查數(shù)據(jù)庫中是否已經(jīng)有該條記錄*/
    private boolean hasData(String tempName) {
        //從Record這個(gè)表里找到name=tempName的id
        Cursor cursor = helper.getReadableDatabase().rawQuery(
                "select id as _id,name from records where name =?", new String[]{tempName});
        //判斷是否有下一個(gè)
        return cursor.moveToNext();
    }

    /*清空數(shù)據(jù)*/
    private void deleteData() {
        db = helper.getWritableDatabase();
        db.execSQL("delete from records");
        db.close();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:focusableInTouchMode="true"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

    <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="50dp"
            android:background="#F6F6F6"
            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:drawablePadding="8dp"
                android:gravity="start|center_vertical"
                android:hint="輸入查詢的關(guān)鍵字"
                android:imeOptions="actionSearch"
                android:singleLine="true"
                android:textColor="@android:color/white"
                android:textSize="16sp"/>

        <ImageView
                android:layout_width="45dp"
                android:layout_height="45dp"
                android:src="@drawable/search"
                android:layout_gravity="center_vertical"
                android:id="@+id/iv_search"/>

    </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="搜索歷史"/>

                <View
                        android:layout_width="match_parent"
                        android:layout_height="1dp"
                        android:background="#EEEEEE"/>

                <com.rain.search.Search_Listview
                        android:id="@+id/listView"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                </com.rain.search.Search_Listview>


            </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="清除搜索歷史"/>

            <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:layout_marginBottom="20dp"
                    android:background="#EEEEEE"/>
        </LinearLayout>

    </ScrollView>
</LinearLayout>
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