搜索历史

其他 2018-06-24 05:13:33 阅读次数: 2

布局====================================================================

main_activity=============================================================

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <com.example.liushibuju.View.MySearchView
                android:id="@+id/mySearchView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"></com.example.liushibuju.View.MySearchView>

            <TextView
                android:id="@+id/sousuo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="搜索"
                android:textSize="20sp" />
        </LinearLayout>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="20px"
            android:text="热门搜索"
            android:textSize="36px" />

        <com.example.liushibuju.View.MyFlowLayout
            android:id="@+id/flow_hot_search"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="#F00"
                android:text="电饭煲" />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="#F00"
                android:text="手机" />


        </com.example.liushibuju.View.MyFlowLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="20px">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="历史搜索"
                android:textSize="36px" />



        </LinearLayout>

        <com.example.liushibuju.View.MyListView
            android:id="@+id/lv_search"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </com.example.liushibuju.View.MyListView>
        <Button
        android:id="@+id/iv_delete"
            android:layout_gravity="center"
            android:layout_marginTop="30dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="清初历史记录"/>
    </LinearLayout>

</ScrollView>

searchview_layout===============================================

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

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="#FFFFFF"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:padding="6px">

        <ImageView
            android:layout_width="30dp"
            android:layout_height="50dp"
           android:src="@mipmap/ic_launcher"/>

        <EditText
            android:id="@+id/et_search"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_gravity="center_vertical"
            android:layout_margin="6px"
            android:layout_weight="1"
            android:background="@null"
            android:hint="   请输入要搜索的关键词"
            android:paddingBottom="10px"
            android:paddingLeft="30px"
            android:paddingTop="10px"
            android:textColor="#333"
            android:textColorHint="#666"
            android:textSize="12sp" />
    </LinearLayout>
</LinearLayout>

Mian_Actvity============================================================

package com.example.liushibuju.View.activity;

import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.liushibuju.Modle.handele.MyOpenHelper;
import com.example.liushibuju.R;
import com.example.liushibuju.View.MyFlowLayout;
import com.example.liushibuju.View.MyListView;
import com.example.liushibuju.View.MySearchView;
import com.example.liushibuju.View.adapter.MyAdapter;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private MySearchView mySearchView;
    private MyFlowLayout myFlowLayout;
    private MyListView myListView;
    private TextView sousuo;
    private MyOpenHelper myOpenHelper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化页面
        initViews();
        //初始化数据库
        initDatabase();
    }

    private void initDatabase() {
        myOpenHelper = new MyOpenHelper(this);
        SQLiteDatabase database = myOpenHelper.getReadableDatabase();
    }

    private void initViews() {
        mySearchView = findViewById(R.id.mySearchView);
        myFlowLayout = findViewById(R.id.flow_hot_search);
        myListView = findViewById(R.id.lv_search);
        sousuo = findViewById(R.id.sousuo);
        sousuo.setOnClickListener(this);
        Button dele = findViewById(R.id.iv_delete);
        dele.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.sousuo:
                //获取数据
                String con = mySearchView.getContent();
                //存入数据库
                SQLiteDatabase db = myOpenHelper.getReadableDatabase();
                ContentValues contentValues = new ContentValues();
                contentValues.put("content", con);
                db.insert("history", null, contentValues);
                db.close();
                //展示在列表
//                查询数据
                SQLiteDatabase db1 = myOpenHelper.getReadableDatabase();
                Cursor cursor = db1.query("history", null, null, null, null, null, null);
                List<String> list = new ArrayList<>();
                while (cursor.moveToNext()) {
                    String content = cursor.getString(cursor.getColumnIndex("content"));
                    list.add(content);
                }
                db1.close();
                //设置适配器
                MyAdapter myAdapter = new MyAdapter(MainActivity.this, list);
                myListView.setAdapter(myAdapter);
                break;
            case R.id.iv_delete:
                SQLiteDatabase db2 = myOpenHelper.getReadableDatabase();
                db2.delete("history",null,null);
                db2.close();


                SQLiteDatabase db3 = myOpenHelper.getReadableDatabase();
                Cursor cursor3 = db3.query("history", null, null, null, null, null, null);
                List<String> list1 = new ArrayList<>();
                while (cursor3.moveToNext()) {
                    String content = cursor3.getString(cursor3.getColumnIndex("content"));
                    list1.add(content);
                }
                db3.close();
                //设置适配器
                MyAdapter myAdapter2 = new MyAdapter(MainActivity.this, list1);
                myListView.setAdapter(myAdapter2);
                break;
        }
    }
}

Adapter=========================================================

package com.example.liushibuju.View.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

/**
 * Created by 你家大林哥 on 2018/5/3.
 */

public class MyAdapter extends BaseAdapter {
    private final Context context;
    private final List<String> list;

    public MyAdapter(Context context, List<String> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView textView = new TextView(context);
        textView.setText(list.get(position));
        textView.setTextSize(20);
        return textView;
    }
}

MyFlowLayout========================================================

package com.example.liushibuju.View;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;

/**
 * Created by 你家大林哥 on 2018/5/3.
 */

public class MyFlowLayout extends ViewGroup {
    private int useWidth;

    private int MaxHeight;

    private int HorizonytalSpace = 5;

    private int VerticalSpaace = 5;

    private Line mLine;

    private int MaxLine = 100;

    private ArrayList<Line> LineList = new ArrayList<Line>();
//    private  int

    public MyFlowLayout(Context context) {
        super(context);
    }

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

    public MyFlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        //获取控件的具体尺寸
        int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();//获取空间的宽度
        int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();//获取控件的高度
        //获取控件的测量模式
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);//宽度的测量模式
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);//高度的测量模式

        //开始遍历所有的子控件
        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View childView = getChildAt(i);
            //获取子控件的尺寸，与测量模式
            int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width,widthMode == MeasureSpec.EXACTLY?MeasureSpec.AT_MOST:widthMode);
            int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height,heightMode == MeasureSpec.EXACTLY?MeasureSpec.AT_MOST:heightMode);
            //测量子控件
            childView.measure(childWidthMeasureSpec,childHeightMeasureSpec);

            int childWidth = childView.getMeasuredWidth();//子控件的宽度
            int childHeight = childView.getMeasuredHeight();//子控件的高度

            useWidth += childWidth;

            if(mLine == null){
                mLine = new Line();
            }

            if(useWidth < width){
                //未超过最大限度，可以添加到当前行
                mLine.addView(childView);
                useWidth += HorizonytalSpace;

                if(useWidth >= width){
                    if(!newLine()){
                        break;//创建失败，结束for循环
                    }
                }
            }else {
                //2.但前行没有控件，必须加入到当前行，然后换行
                if(mLine.getLineCount() == 0){
                    //添加到当前行，然后换行
                    mLine.addView(childView);
                    LineList.add(mLine);
                    if(!newLine()){
                        break;
                    }

                }else {
                    //超过最大高度，
                    //1.当前行有控件，需要新建一行
                    if(!newLine()){
                        break;
                    }
                    mLine.addView(childView);
                    useWidth += HorizonytalSpace + childWidth;
                }
            }
            if (mLine != null && mLine.getLineCount() > 0
                    && !LineList.contains(mLine)) {
                // 由于前面采用判断长度是否超过最大宽度来决定是否换行，则最后一行可能因为还没达到最大宽度，所以需要验证后加入集合中
                LineList.add(mLine);
            }

        }
        //为控件设置宽度，高度
        int Totalwidth = MeasureSpec.getSize(widthMeasureSpec);
        int TotalHeight = 0;
        for (int i = 0; i <LineList.size() ; i++) {
            TotalHeight += LineList.get(i).MaxHeight;
        }
        TotalHeight += (LineList.size() - 1)*VerticalSpaace + getPaddingTop() + getPaddingBottom();
        setMeasuredDimension(Totalwidth,TotalHeight);
//        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        //遍历行集合(LineList)，
        int Top = getPaddingTop();
        int Left = getPaddingLeft();
        for (int i = 0; i < LineList.size(); i++) {
            Line line = LineList.get(i);

            line.layoutView(Left,Top);

            Top += line.MaxHeight + VerticalSpaace;
        }
    }

    private boolean newLine(){
        //判断是否超过最大行数
        if(LineList.size() < MaxLine){
            //将上一行添加到，LineList中
            LineList.add(mLine);
            mLine = new Line();//创建一个新的行
            //新的一行，使用的数据为0
            useWidth = 0;
            MaxHeight = 0;
            return true;//创建成功返回true
        }
        return false;
    }

    //创建一个类，用来处理每一行的数据
    class Line{

        private int mLineWidth = 0;

        private int MaxHeight = 0;

        private ArrayList<View> viewlist = new ArrayList<View>();

        public void addView(View view){

            viewlist.add(view);
            mLineWidth += view.getMeasuredWidth();
            int childHeight = view.getMeasuredHeight();
            MaxHeight = MaxHeight < childHeight?childHeight:MaxHeight;

        }

        public int getLineCount(){
            return viewlist.size();
        }

        public void layoutView(int l,int t){
            //对此行的数据进行布局
            int Left = l;
            int Top = t;

            int childCount = viewlist.size();
            int width = getMeasuredWidth() - getPaddingLeft() - getPaddingRight() -(childCount-1) * HorizonytalSpace;

            //计算剩余宽度
            int surplusWidth  = width - mLineWidth;
            if(surplusWidth > 0){
                //计算每个布局的添加量
                int widthOffSet = (int) (surplusWidth * 1.0f/viewlist.size() + 0.5f);

                for (int i = 0; i < viewlist.size(); i++) {

                    View view = viewlist.get(i);
                    int childWidth = view.getMeasuredWidth();
                    int childHeight = view.getMeasuredHeight();

                    childWidth += widthOffSet;//重新分配控件的高度

                    int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidth,MeasureSpec.EXACTLY);
                    int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeight,MeasureSpec.EXACTLY);

                    view.measure(childWidthMeasureSpec,childHeightMeasureSpec);
                    //分配布局控件时的偏移量
                    int TopOffSet = (MaxHeight - childHeight) / 2;
                    TopOffSet = TopOffSet>0?TopOffSet:0;//如果TopOffSet（竖直方向的偏移量）小于0，则设置为0;
                    view.layout(Left,Top+ TopOffSet,Left +childWidth,Top + TopOffSet + childHeight);

                    Left += HorizonytalSpace + childWidth;
                }
            }else{
            }
        }
    }

    public void setHorizontalSpacing(int horizonytalSpace) {
        HorizonytalSpace = horizonytalSpace;
    }

    public void setVerticalSpacing(int verticalSpaace) {
        VerticalSpaace = verticalSpaace;
    }
}

MyListView============================================================

package com.example.liushibuju.View;

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

/**
 * Created by 你家大林哥 on 2018/5/3.
 */

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 defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int heightMea = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);

        super.onMeasure(widthMeasureSpec, heightMea);
    }
}

MySearchView============================================================

package com.example.liushibuju.View;

import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;

import com.example.liushibuju.R;

/**
 * Created by 你家大林哥 on 2018/5/3.
 */

public class MySearchView extends LinearLayout {
    private EditText et_search;

    public MySearchView(Context context) {
        this(context, null);
    }

    public MySearchView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MySearchView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        View view = View.inflate(context, R.layout.searchview_layout, this);

        et_search = view.findViewById(R.id.et_search);

    }

    //获取信息
    public String getContent() {
        return et_search.getText().toString();
    }
}

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