import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;/**
 * 流式布局
 * Created by zhangxutong on 2016/1/17.
 */
public class FlowViewGroup extends ViewGroup {private static final String TAG = "zxt/FlowViewGroup";public FlowViewGroup(Context context) {this(context, null);}public FlowViewGroup(Context context, AttributeSet attrs) {this(context, attrs, 0);}public FlowViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}//在onMeasure里，测量所有子View的宽高，以及确定Viewgroup自己的宽高。
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {//获取系统传递过来测量出的宽度 高度，以及相应的测量模式。
        //如果测量模式为 EXACTLY( 确定的dp值，match_parent)，则可以调用setMeasuredDimension()设置，
        //如果测量模式为 AT_MOST(wrap_content),则需要经过计算再去调用setMeasuredDimension()设置
        int widthMeasure = MeasureSpec.getSize(widthMeasureSpec);int widthMode = MeasureSpec.getMode(widthMeasureSpec);int heightMeasure = MeasureSpec.getSize(heightMeasureSpec);int heightMode = MeasureSpec.getMode(heightMeasureSpec);//计算宽度 高度 //wrap_content测量模式下会使用到:
        //存储最后计算出的宽度，
        int maxLineWidth = 0;//存储最后计算出的高度
        int totalHeight = 0;//存储当前行的宽度
        int curLineWidth = 0;//存储当前行的高度
        int curLineHeight = 0;// 得到内部元素的个数
        int count = getChildCount();//存储子View
        View child =null;//存储子View的LayoutParams
        MarginLayoutParams params =null;//子View Layout需要的宽高(包含margin)，用于计算是否越界
        int childWidth;int childHeight;//遍历子View 计算父控件宽高
        for (int i = 0; i < count; i++) {child = getChildAt(i);//如果gone，不测量了
            if (View.GONE == child.getVisibility()) {continue;}//先测量子View
            measureChild(child, widthMeasureSpec, heightMeasureSpec);//获取子View的LayoutParams，(子View的LayoutParams的对象类型，取决于其ViewGroup的generateLayoutParams()方法的返回的对象类型，这里返回的是MarginLayoutParams)
            params = (MarginLayoutParams) child.getLayoutParams();//子View需要的宽度 为 子View 本身宽度+marginLeft + marginRight
            childWidth = child.getMeasuredWidth() + params.leftMargin + params.rightMargin;childHeight = child.getMeasuredHeight() + params.topMargin + params.bottomMargin;Log.i(TAG, "子View Layout需要的宽高(包含margin)：childWidth:" + childWidth + "   ,childHeight:" + childHeight);//如果当前的行宽度大于 父控件允许的最大宽度 则要换行
            //父控件允许的最大宽度 如果要适配 padding 这里要- getPaddingLeft() - getPaddingRight()
            //即为测量出的宽度减去父控件的左右边距
            if (curLineWidth + childWidth > widthMeasure - getPaddingLeft() - getPaddingRight()) {//通过比较 当前行宽 和以前存储的最大行宽,得到最新的最大行宽,用于设置父控件的宽度
                maxLineWidth = Math.max(maxLineWidth, curLineWidth);//父控件的高度增加了，为当前高度+当前行的高度
                totalHeight += curLineHeight;//换行后 刷新 当前行 宽高数据： 因为新的一行就这一个View，所以为当前这个view占用的宽高(要加上View 的 margin)
                curLineWidth = childWidth;curLineHeight = childHeight;} else {//不换行：叠加当前行宽 和 比较当前行高:
                curLineWidth += childWidth;curLineHeight = Math.max(curLineHeight, childHeight);}//如果已经是最后一个View,要比较当前行的 宽度和最大宽度，叠加一共的高度
            if (i == count - 1) {maxLineWidth = Math.max(maxLineWidth, curLineWidth);totalHeight += childHeight;}}Log.i(TAG, "系统测量允许的尺寸最大值：widthMeasure:" + widthMeasure + "   ,heightMeasure:" + heightMeasure);Log.i(TAG, "经过我们测量实际的尺寸(不包括父控件的padding)：maxLineWidth:" + maxLineWidth + "   ,totalHeight:" + totalHeight);Log.i(TAG, "heightMode == MeasureSpec.AT_MOST:" +(heightMode == MeasureSpec.AT_MOST));Log.i(TAG, "heightMode == MeasureSpec.EXACTLY:" +(heightMode == MeasureSpec.EXACTLY));Log.i(TAG, "heightMode == MeasureSpec.UNSPECIFIED:" +(heightMode == MeasureSpec.UNSPECIFIED));//适配padding,如果是wrap_content,则除了子控件本身占据的控件，还要在加上父控件的padding
        setMeasuredDimension(widthMode != MeasureSpec.EXACTLY ? maxLineWidth + getPaddingLeft() + getPaddingRight() : widthMeasure,heightMode != MeasureSpec.EXACTLY ? totalHeight + getPaddingTop() + getPaddingBottom() : heightMeasure);//fix by zhangxutong 有些页面太长了
    }//布局父控件位置以及子控件的位置
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {Log.i(TAG, "changed:" + changed + "   ,l:" + l + "  t:" + t + "  r:" + r + "  b:" + b);//子控件的个数
        int count = getChildCount();//ViewParent宽度(包含padding)
        int width = getWidth();//ViewParent 的右边x的布局限制值
        int rightLimit =  width - getPaddingRight();//存储基准的left top (子类.layout(),里的坐标是基于父控件的坐标，所以 x应该是从0+父控件左内边距开始，y从0+父控件上内边距开始)
        int baseLeft = 0 + getPaddingLeft();int baseTop = 0 + getPaddingTop();//存储现在的left top
        int curLeft = baseLeft;int curTop = baseTop;//子View
        View child = null;//子view用于layout的 l t r b
        int viewL,viewT,viewR,viewB;//子View的LayoutParams
        MarginLayoutParams params = null;//子View Layout需要的宽高(包含margin)，用于计算是否越界
        int childWidth;int childHeight;//子View 本身的宽高
        int childW,childH;//临时增加一个temp 存储上一个View的高度 解决过长的两行View导致显示不正确的bug
        int lastChildHeight =0;//
        for (int i = 0; i < count; i++) {child = getChildAt(i);//如果gone，不布局了
            if (View.GONE == child.getVisibility()) {continue;}//获取子View本身的宽高:
            childW = child.getMeasuredWidth();childH = child.getMeasuredHeight();//获取子View的LayoutParams，用于获取其margin
            params = (MarginLayoutParams) child.getLayoutParams();//子View需要的宽高 为 本身宽高+marginLeft + marginRight
            childWidth =  childW + params.leftMargin + params.rightMargin;childHeight = childH + params.topMargin + params.bottomMargin;//这里要考虑padding，所以右边界为 ViewParent宽度(包含padding) -ViewParent右内边距
            if (curLeft + childWidth > rightLimit ) {//如果当前行已经放不下该子View了 需要换行放置：
                //在新的一行布局子View，左x就是baseLeft，上y是 top +前一行高(这里假设的是每一行行高一样)，
                curTop = curTop + lastChildHeight;//layout时要考虑margin
                viewL = baseLeft +params.leftMargin;viewT = curTop + params.topMargin;viewR = viewL + childW;viewB = viewT + childH;//child.layout(baseLeft + params.leftMargin, curTop + params.topMargin, baseLeft + params.leftMargin + child.getMeasuredWidth(), curTop + params.topMargin + child.getMeasuredHeight());
                //Log.i(TAG,"新的一行:" +"   ,baseLeft:"+baseLeft +"  curTop:"+curTop+"  baseLeft+childWidth:"+(baseLeft+childWidth)+"  curTop+childHeight:"+ ( curTop+childHeight));
                curLeft = baseLeft + childWidth;} else {//当前行可以放下子View:
                viewL = curLeft +params.leftMargin;viewT = curTop + params.topMargin;viewR = viewL + childW;viewB = viewT + childH;//child.layout(curLeft + params.leftMargin, curTop + params.topMargin, curLeft + params.leftMargin + child.getMeasuredWidth(), curTop + params.topMargin + child.getMeasuredHeight());
                //Log.i(TAG,"当前行:"+changed +"   ,curLeft:"+curLeft +"  curTop:"+curTop+"  curLeft+childWidth:"+(curLeft+childWidth)+"  curTop+childHeight:"+(curTop+childHeight));
                curLeft = curLeft + childWidth;}lastChildHeight = childHeight;//布局子View
            child.layout(viewL,viewT,viewR,viewB);}}/**
     * @return 当前ViewGroup返回的Params的类型
     */
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {return new MarginLayoutParams(getContext(), attrs);}
}

最后： MainActivity.java

import android.content.Context;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class MainActivity extends AppCompatActivity {TextView tv;private ArrayList<String> list=new ArrayList<String>();private FlowViewGroup mFlowViewGroup;private EditText et_search;private TextView tv_tip;private TextView tv_clear;private RecordSQLiteOpenHelper helper = new RecordSQLiteOpenHelper(this);;private SQLiteDatabase db;private ImageButton Pib01;public MainActivity() {}@Override
    public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 初始化控件
        initView();Intent intent = getIntent();// 清空搜索历史
        tv_clear.setOnClickListener(new View.OnClickListener() {@Override
            public void onClick(View v) {deleteData();initDatas("");mFlowViewGroup.setVisibility(View.INVISIBLE);finish();Intent intent = new Intent(MainActivity.this, MainActivity.class);startActivity(intent);overridePendingTransition(0,0);}});// 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_(String.valueOf(et_search.getText()));}finish();Intent intent = new Intent(MainActivity.this,MainActivity.class);intent.putExtra("ss",et_search.getText().toString().trim());startActivity(intent);}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) {String tempName = et_search.getText().toString();// 根据tempName去模糊查询数据库中有没有数据
                //initDatas(tempName);

            }});// 插入数据，便于测试，否则第一次进入没有数据怎么测试呀？
        insertData(null);/*// 第一次进入查询所有的历史记录
        queryData("");*/
        initDatas("");}/**
     * 插入数据
     */
    private void insertData(String tempName) {if (tempName!=null) {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);if (cursor.moveToNext()) {cursor.moveToFirst();int a=0;do {String name = cursor.getString(cursor.getColumnIndex("name"));Log.i("TAG", "表searchHisTab的name=" + name);if (name != null && !name.equals("")) {list.add(name);}} while (cursor.moveToNext());cursor.close();}}/**
     * 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() {mFlowViewGroup = (FlowViewGroup) findViewById(R.id.flowlayout);et_search = (EditText) findViewById(R.id.et_search);tv_clear = (TextView) findViewById(R.id.tv_clear);et_search.setOnEditorActionListener(new TextView.OnEditorActionListener() {@Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {if (actionId == EditorInfo.IME_ACTION_SEARCH) {Log.i("---","搜索操作执行");/* jsonArray1=null;
                    init2(null);*/
                }return false;}});}/**
     * 隐藏软键盘
     *
     * @param ev
     * @return
     */
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {if (ev.getAction() == MotionEvent.ACTION_DOWN) {View v = getCurrentFocus();if (isShouldHideInput(v, ev)) {InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);if (imm != null) {imm.hideSoftInputFromWindow(v.getWindowToken(), 0);}}return super.dispatchTouchEvent(ev);}// 必不可少，否则所有的组件都不会有TouchEvent了
        if (getWindow().superDispatchTouchEvent(ev)) {return true;}return onTouchEvent(ev);}public boolean isShouldHideInput(View v, MotionEvent event) {if (v != null && (v instanceof EditText)) {int[] leftTop = {0, 0};//获取输入框当前的location位置
            v.getLocationInWindow(leftTop);int left = leftTop[0];int top = leftTop[1];int bottom = top + v.getHeight();int right = left + v.getWidth();if (event.getX() > left && event.getX() < right&& event.getY() > top && event.getY() < bottom) {// 点击的是输入框区域，保留点击EditText的事件
                return false;} else {return true;}}return false;}private void initDatas(String name) {queryData_(name);for (int i=0;i<list.size();i++){tv= (TextView) LayoutInflater.from(this).inflate(R.layout.item_flow,mFlowViewGroup,false);tv.setText(list.get(i));tv.setOnClickListener(new View.OnClickListener() {@Override
                public void onClick(View v) {//Toast.makeText(Pdd_search.this,""+((TextView)v).getText(),Toast.LENGTH_SHORT).show();
                    et_search.setText(((TextView)v).getText());}});mFlowViewGroup.addView(tv);}}
}