自定义 FlowLayout流式布局搜索框加 GreenDao存取搜索记录，使用RecyclerView展示

最新推荐文章于 2024-05-08 12:09:02 发布

原创最新推荐文章于 2024-05-08 12:09:02 发布 · 693 阅读

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文章标签：

# FlowLayout流式布局搜索框 #GreenDao增删查搜索记录 #RecyclerView展示数据 #自定义view继承ViewGroup #shape

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输入框布局的shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
   <corners android:radius="30dp"/>
   <stroke android:width="2dp" android:color="@color/darkgray"/>
   <solid android:color="@color/color_white"/>
   <padding android:top="8dp" android:bottom="8dp" android:left="5dp"/>
</shape>

热搜流式布局的shape

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<!--    <solid
        android:color="@android:color/white"/>-->

    <corners
        android:radius="28dp"/>

    <stroke
        android:width="1dp"
        android:color="#3799f4"/>

    <padding
        android:left="5dp"
        android:right="5dp"
        android:top="5dp"
        android:bottom="5dp"
        />
</shape>

自定义流式布局View的主体内容

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;

/**
 * Created   by   Dewey .
 * 自定义流式布局显示搜索框
 */
public class FlowLayout extends ViewGroup {

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

    public FlowLayout(Context context, AttributeSet attrs) {
            this(context, attrs, 0);
    }

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

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

        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        // 如果是warp_content情况下，记录宽和高
        int width = 0;
        int height = 0;

        // 记录每一行的宽度与高度
        int lineWidth = 0;
        int lineHeight = 0;

        // 得到内部元素的个数
        int cCount = getChildCount();

        for (int i = 0; i < cCount; i++)
        {
            // 通过索引拿到每一个子view
            View child = getChildAt(i);
            // 测量子View的宽和高,系统提供的measureChild
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            // 得到LayoutParams
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            // 子View占据的宽度
            int childWidth = child.getMeasuredWidth() + lp.leftMargin
                    + lp.rightMargin;
            // 子View占据的高度
            int childHeight = child.getMeasuredHeight() + lp.topMargin
                    + lp.bottomMargin;

            // 换行 判断 当前的宽度大于 开辟新行
            if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight())
            {
                // 对比得到最大的宽度
                width = Math.max(width, lineWidth);
                // 重置lineWidth
                lineWidth = childWidth;
                // 记录行高
                height += lineHeight;
                lineHeight = childHeight;
            }
            else
            // 未换行
            {
                // 叠加行宽
                lineWidth += childWidth;
                // 得到当前行最大的高度
                lineHeight = Math.max(lineHeight, childHeight);
            }
            // 特殊情况,最后一个控件
            if (i == cCount - 1)
            {
                width = Math.max(lineWidth, width);
                height += lineHeight;
            }
        }
        setMeasuredDimension(
                modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),
                modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//
        );

    }

    /**
     * 存储所有的View
     */
    private List<List<View>>    mAllViews   = new ArrayList<List<View>>();
    /**
     * 每一行的高度
     */
    private List<Integer> mLineHeight = new ArrayList<Integer>();

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b)
    {
        mAllViews.clear();
        mLineHeight.clear();

        // 当前ViewGroup的宽度
        int width = getWidth();

        int lineWidth = 0;
        int lineHeight = 0;

        // 存放每一行的子view
        List<View> lineViews = new ArrayList<View>();

        int cCount = getChildCount();

        for (int i = 0; i < cCount; i++)
        {
            View child = getChildAt(i);
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            // 如果需要换行
            if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight())
            {
                // 记录LineHeight
                mLineHeight.add(lineHeight);
                // 记录当前行的Views
                mAllViews.add(lineViews);

                // 重置我们的行宽和行高
                lineWidth = 0;
                lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
                // 重置我们的View集合
                lineViews = new ArrayList<View>();
            }
            lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
            lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
                    + lp.bottomMargin);
            lineViews.add(child);

        }// for end

        // 处理最后一行
        mLineHeight.add(lineHeight);
        mAllViews.add(lineViews);

        // 设置子View的位置

        int left = getPaddingLeft();
        int top = getPaddingTop();

        // 行数
        int lineNum = mAllViews.size();

        for (int i = 0; i < lineNum; i++)
        {
            // 当前行的所有的View
            lineViews = mAllViews.get(i);
            lineHeight = mLineHeight.get(i);

            for (int j = 0; j < lineViews.size(); j++)
            {
                View    child = lineViews.get(j);
                // 判断child的状态
                if (child.getVisibility() == View.GONE)
                {
                    continue;
                }

                MarginLayoutParams lp = (MarginLayoutParams) child
                        .getLayoutParams();

                int lc = left + lp.leftMargin;
                int tc = top + lp.topMargin;
                int rc = lc + child.getMeasuredWidth();
                int bc = tc + child.getMeasuredHeight();

                // 为子View进行布局
                child.layout(lc, tc, rc, bc);

                left += child.getMeasuredWidth() + lp.leftMargin
                        + lp.rightMargin;
            }
            left = getPaddingLeft();
            top += lineHeight;
        }

    }

    /**
     * 与当前ViewGroup对应的LayoutParams
     */
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs)
    {
        return new MarginLayoutParams(getContext(), attrs);
    }

}

主MainActivity布局

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

        <LinearLayout
            android:layout_marginTop="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            >
            <ImageView
                android:layout_gravity="center_vertical"
                android:layout_marginLeft="8dp"
                android:layout_width="50dp"
                android:layout_height="50dp"
                android:src="@drawable/left"
                android:id="@+id/backJian"
                />

            <LinearLayout
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="wrap_content" >

                <EditText
                    android:id="@+id/edit_input"
                    android:layout_gravity="center_vertical"
                    android:layout_margin="10dp"
                    android:drawableLeft="@drawable/search_icon"
                    android:drawablePadding="5dp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@drawable/search_edittext_shape"
                    android:textSize="16sp"
                    android:imeOptions="actionSearch"
                    android:inputType="text"
                    android:hint="请输入关键字"/>

            </LinearLayout>

            <ImageView
                android:src="@drawable/right"
                android:id="@+id/search_btn"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_marginTop="10dp"
                android:layout_marginBottom="10dp"
                android:layout_gravity="center_vertical"
                android:layout_width="50dp"
                android:layout_height="50dp"/>
        </LinearLayout>

        <TextView
            android:layout_width="match_parent"
            android:layout_marginTop="10dp"
            android:layout_height="1dp"
            android:background="#050505"  />

        <!-- 流式布局 -->
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:textStyle="bold"
            android:textSize="18sp"
            android:text="热搜"
            />

    <!--自定义的flowlayout,引用的是自己的包名-->
    <com.example.custom.FlowLayout
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:id="@+id/id_flowlayout"  >
    </com.example.custom.FlowLayout>


    <TextView
        android:layout_width="match_parent"
        android:layout_marginTop="10dp"
        android:layout_height="1dp"
        android:background="#050505"  />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="10dp"
        android:textStyle="bold"
        android:textSize="18sp"
        android:text="搜索记录"
        />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/history_recyclerView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"></android.support.v7.widget.RecyclerView>

    <Button
        android:layout_width="match_parent"
        android:layout_marginRight="60dp"
        android:layout_marginLeft="60dp"
        android:layout_height="40dp"
        android:background="#ffffff"
        android:text="清空历史搜索"
        android:id="@+id/clearbtn"/>

</LinearLayout>

主 MainActivity功能代码

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast; 
import org.greenrobot.greendao.query.Query;
import java.util.ArrayList;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

/*
   搜索框页面：
    1. 搜索框输入内容
    2. 自定义流式布局，展示搜索的菜名记录
    3. 使用GreenDao操作数据库，保存搜索记录，当下次进入搜索页面，能展示记录
    4. 点击清除按钮清除数据库内容
    5. 点击搜索，根据搜索内容，请求数据
 */
public class MainActivity extends Activity {
    @BindView(R.id.edit_input)
    EditText editInput;
    @BindView(R.id.search_btn)
    ImageView searchBtn;
    @BindView(R.id.history_recyclerView)
    RecyclerView historyRecyclerView;
    @BindView(R.id.id_flowlayout)
    FlowLayout flowlayout;
    private HistoryAdapter historyAdapter;
    List<String> list = new ArrayList<>(); //历史搜索输入数据集合
    private Query<SearchDaoBean> queryDao;  //历史搜索查询数据集合
    private SearchDaoBeanDao dao;
    private String flows[] = {
            "应急启动电源", "餐桌", "粽子散装",
            "智能手表", "摩托车配件", "批发方便面",
            "王中王火腿", "手机", "桶装矿泉水",
            "U盘64G", "机械革命电脑", "洗发水",
            "护发素", "奶粉", "search", "logcat"
    };

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        //自定义流式布局初始化视图
        initChildViews();

        //设置搜索记录布局视图
        initHistoryResultData();

        //获取数据库实例,把历史记录显示在页面上
        dao = MyApplication.session.getSearchDaoBeanDao();
        queryDao = dao.queryBuilder().orderAsc(SearchDaoBeanDao.Properties.Id).build();
        List<SearchDaoBean> daoBeanList = queryList();
        for (int i = 0; i < daoBeanList.size(); i++) {
            list.add(daoBeanList.get(i).getSelectGoods());
        }

    }

    //流式布局
    public void initChildViews() {
        ViewGroup.MarginLayoutParams lp = new ViewGroup.MarginLayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        //下面为  热搜流式布局子条目间距
        lp.leftMargin = 10;
        lp.rightMargin = 10;
        lp.topMargin = 10;
        lp.bottomMargin = 10;
        for(int i = 0; i < flows.length; i ++){
            TextView view = new TextView(this);
            view.setText(flows[i]);
            view.setTextSize(21);
            //view.setTextColor(Color.WHITE);
            view.setBackgroundDrawable(getResources().getDrawable(R.drawable.label_bg));

            //添加到父View
            flowlayout.addView(view,lp);
        }
    }

    private void initHistoryResultData() {
        //设置搜索结果适配器以及布局管理器
         historyRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false));
        historyAdapter = new HistoryAdapter(MainActivity.this, list);
        historyRecyclerView.setAdapter(historyAdapter);
    }

    @OnClick({R.id.search_btn,  R.id.clearbtn , R.id.backJian})
    public void onViewClicked(View view) {
        switch (view.getId()) {

            //点击搜索按钮,传递数据RecyclerView显示，并存入数据库
            case R.id.search_btn:
                //判断输入为空情况下
                 String string = editInput.getText().toString().trim();
                if (TextUtils.isEmpty(string) || string.length() == 0) {
                    Toast.makeText(this, "输入内容不能为空", Toast.LENGTH_SHORT).show();
                    return;
                }

                //保存搜索历史到数据库
                  String trim = editInput.getText().toString().trim();
                SearchDaoBean daoBean = new SearchDaoBean(null, "1775", "TheScar", trim);
                dao.insert(daoBean);
                historyAdapter.notifyDataSetChanged();

                break;

            //清空历史搜索集合,，清空数据库，刷新数据
            case R.id.clearbtn:
                list.clear();
                deleteAllData();
                historyAdapter.notifyDataSetChanged();
                break;

            //销毁当前页面
            case R.id.backJian:
                finish();
                break;

            default:
                break;
        }
    }

    //查询全部数据的方法
    private List<SearchDaoBean> queryList() {
        List<SearchDaoBean> daoBeans = queryDao.list();
        return daoBeans;
    }

    //删除所有数据，即清空历史记录
    public void deleteAllData() {
        dao.deleteAll();
    }
}

历史搜索记录布局适配器 HistoryAdapter

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.example.duhongwang20180601.R;
import java.util.List;

/**
 * 历史搜索记录数据 适配器
 */

public class HistoryAdapter extends RecyclerView.Adapter<HistoryAdapter.ViewHolder>{
    private Context context;
    private List<String> list;

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

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(context, R.layout.layout_history, null);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.tv.setText(list.get(position));
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        private TextView tv;

        public ViewHolder(View itemView) {
            super(itemView);
            tv = (TextView)itemView.findViewById(R.id.history_text);
        }
    }
}

适配器对应的布局 layout_history.xml

<?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="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/history_text"
        android:layout_margin="7dp"
        android:textSize="15sp"
        android:text="" />

</LinearLayout>

GreenDao全局配置初始化 MyApplication

import android.app.Application;
import com.example.duhongwang20180601.dao.DaoMaster;
import com.example.duhongwang20180601.dao.DaoSession;
import com.facebook.drawee.backends.pipeline.Fresco;
import org.greenrobot.greendao.database.Database;

/**
 * Fresco  GreenDao  的初始化全局配置类
 */
public class MyApplication extends Application {
    //抽取为全局变量
    public static DaoSession session;

    @Override
    public void onCreate() {
        super.onCreate();

        //1. Fresco
        Fresco.initialize(this);

        //2. GreenDao
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, "rikao");
        Database db = helper.getWritableDb();
        session = new DaoMaster(db).newSession();
    }
}

搜索框输入数据封装为 GreenDao bean 类

import org.greenrobot.greendao.annotation.Entity;
import org.greenrobot.greendao.annotation.Id;
import org.greenrobot.greendao.annotation.Generated;

/**
 * Created   by   Dewey .
 * 搜索框输入数据封装为 DreenDao bean 类
 */
@Entity
public class SearchDaoBean {
    @Id(autoincrement = true)
    private Long id;
    private String uid;
    private String uname;
    private String selectGoods;
    @Generated(hash = 1024397953)
    public SearchDaoBean(Long id, String uid, String uname, String selectGoods) {
        this.id = id;
        this.uid = uid;
        this.uname = uname;
        this.selectGoods = selectGoods;
    }
    @Generated(hash = 1406499419)
    public SearchDaoBean() {
    }
    public Long getId() {
        return this.id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getUid() {
        return this.uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }
    public String getUname() {
        return this.uname;
    }
    public void setUname(String uname) {
        this.uname = uname;
    }
    public String getSelectGoods() {
        return this.selectGoods;
    }
    public void setSelectGoods(String selectGoods) {
        this.selectGoods = selectGoods;
    }


}

布局用到的图片

left.png

right.png

search_icon.png

功能依赖

//1. Recycycleview
compile 'com.android.support:recyclerview-v7:26.+'

//2.添加GreenDao及数据库database的依赖
compile 'org.greenrobot:greendao:3.2.2'
compile 'org.greenrobot:greendao-generator:3.0.0'
compile 'net.zetetic:android-database-sqlcipher:3.5.7@aar'  //数据库加密（较新版本）

//7.ButtonKnife
//butterknife在Studio3.0版本上需使用以下8.8.1版本（下面2行代码都要加）
compile 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'