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
     */
    @Overridepublic 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();}
}

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Android自定义View实现流式布局TextView

2016年12月30日 18KB 下载

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