package com.hyang.administrator.studentproject.widget;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.view.View;

import android.view.ViewGroup;

import java.util.ArrayList;

import java.util.List;

/**

 * Created by Administrator on 2017/6/20.

 */

public class FlowGroupView extends ViewGroup {

    /**

     * 储存所有的view 按行记录

     */

    private List<List<View>> mAllViews = new ArrayList<List<View>>();

    /**

     * 记录每一行的高度

     */

    private List<Integer> mLineHeight = new ArrayList<Integer>();

    private String TAG = "TAG";

    public FlowGroupView(Context context, AttributeSet attrs,

                         int defStyleAttr) {

        super(context, attrs, defStyleAttr);

    }

    public FlowGroupView(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    public FlowGroupView(Context context) {

        super(context);

    }

    @Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        // 置空 view 容器 和 lineHeight 容器  重新赋值

        //因为OnMeasure方法会走两次，第一次是实例化这个对象的时候高度和宽度都是0

        //之后走了OnSizeChange()方法后 又走了一次OnMeasure，所以要把第一次加进去的数据清空。

        mAllViews.clear();

        mLineHeight.clear();

        //得到上级容器为其推荐的宽高和计算模式

        int specWidthMode = MeasureSpec.getMode(widthMeasureSpec);

        int specHeighMode = MeasureSpec.getMode(heightMeasureSpec);

        int specWidthSize = MeasureSpec.getSize(widthMeasureSpec);

        int specHeighSize = MeasureSpec.getSize(heightMeasureSpec);

        // 计算出所有的 child 的 宽和高

//      measureChildren(specWidthSize, specHeighSize);

        // 记录如果是 warp_content 是设置的宽和高

        int width = 0;

        int height = 0;

        // 得到子view的个数

        int cCount = getChildCount();

        /**

         * 记录每一行的宽度，width不断取最大宽度

         */

        int lineWidth = 0;

        /**

         * 每一行的高度，累加至height

         */

        int lineHeight = 0;

        // 存储每一行所有的childView

        List<View> lineViews = new ArrayList<View>();

        for (int i = 0; i < cCount; i++) {

            // 得到每个子View

            View child = getChildAt(i);

            // 测量每个子View的宽高

            measureChild(child, widthMeasureSpec, heightMeasureSpec);

            // 当前子view的lp

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

            // 子view的宽和高

            int cWidth = 0;

            int cheight = 0;

            // 当前子 view 实际占的宽

            cWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;

            // 当前子View 实际占的高

            cheight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;

            lineHeight=cheight;

            // 需要换行

            if(lineWidth + cWidth > specWidthSize){

                width = Math.max(lineWidth, cWidth);// 取最大值

                lineWidth = cWidth; // 开启新行的时候重新累加width

                // 开启新行时累加 height

//              lineHeight = cheight; // 记录下一行的高度

                mAllViews.add(lineViews);

                mLineHeight.add(cheight);

                lineViews = new ArrayList<>();

                // 换行的时候把该 view 放进 集合里

                lineViews.add(child);// 这个  view(child) 是下一行的第一个view

                height += cheight; //每个View高度是一样的，直接累加

                Log.e("需要换行", "hight--" + height);

                Log.e("onMeasure", "AllViews.size()  --  > " + mAllViews.size());

            }else {

                // 不需要换行

                lineWidth += cWidth;//

                Log.e("不需要换行","hight--"+height);

                // 不需要换行时 把子View add 进集合

                lineViews.add(child);

            }

            if(i == cCount-1){

                // 如果是最后一个view

                width = Math.max(lineWidth, cWidth);

                height += cheight;

                Log.e("最后一个view","hight--"+height);

            }

        }

        // 循环结束后 把最后一行内容add进集合中

        mLineHeight.add(lineHeight); // 记录最后一行

        mAllViews.add(lineViews);

        // MeasureSpec.EXACTLY 表示设置了精确的值

        // 如果 mode 是 MeasureSpec.EXACTLY 时候，则不是 warp_content 用计算来的值，否则则用上级布局分给它的值

        setMeasuredDimension(

                specWidthMode == MeasureSpec.EXACTLY ? specWidthSize : width,

                specHeighMode == MeasureSpec.EXACTLY ? specHeighSize : height

        );

        Log.e("onMeasure", "mAllViews.size() -- > " + mAllViews.size() + "   mLineHeight.size() -- > " + mLineHeight.size() + "Height -- > "+height);

    }

    /**

     * 所有childView的位置的布局

     */

    @Override

    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        // 当前行的最大高度

        int lineHeight = 0;

        // 存储每一行所有的childView

        List<View> lineViews = new ArrayList<View>();

        int left = 0;

        int top = 0;

        // 得到总行数

        int lineNums = mAllViews.size();

        for (int i = 0; i < lineNums; i++)

        {

            // 每一行的所有的views

            lineViews = mAllViews.get(i);

            // 当前行的最大高度

            lineHeight = mLineHeight.get(i);

            Log.e("onLayout" , "第" + i + "行 ：" + lineViews.size()+"-------lineHeight"+ lineHeight);

            // 遍历当前行所有的View

            for (int j = 0; j < lineViews.size(); j++)

            {

                View child = lineViews.get(j);

                if (child.getVisibility() == View.GONE)

                {

                    continue;

                }

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

                //计算childView的left,top,right,bottom

                int lc = left + lp.leftMargin;

                int tc = top + lp.topMargin;

                int rc =lc + child.getMeasuredWidth();

                int bc = tc + child.getMeasuredHeight();

                child.layout(lc, tc, rc, bc);

                left += child.getMeasuredWidth() + lp.rightMargin + lp.leftMargin;

            }

            left = 0;

            top += lineHeight;

        }

        Log.v("onLayout", "onLayout   mAllViews.size() -- > " + mAllViews.size() + "   mLineHeight.size() -- > "+ mLineHeight.size());

    }

    /**

     * 这个一定要设置，否则会包强转错误

     * 设置它支持 marginLayoutParams

     */

    @Override

    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {

        return new MarginLayoutParams(getContext(),attrs);

    }

}

 <com.hyang.administrator.studentproject.widget.FlowGroupView

     android:id="@+id/flow_view_group"

     android:layout_width="match_parent"

     android:layout_height="wrap_content">

 </com.hyang.administrator.studentproject.widget.FlowGroupView>

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <solid android:color="#E7E7E7" >

    </solid>

    <corners

        android:radius="30dp"

        />

    <padding

        android:bottom="2dp"

        android:left="10dp"

        android:right="10dp"

        android:top="2dp" />

</shape>

 package com.hyang.administrator.studentproject.activity;

 import android.graphics.Color;

 import android.os.Bundle;

 import android.support.v7.app.AppCompatActivity;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.Button;

 import android.widget.TextView;

 import android.widget.Toast;

 import com.hyang.administrator.studentproject.R;

 import com.hyang.administrator.studentproject.widget.FlowGroupView;

 import org.xutils.view.annotation.ViewInject;

 import org.xutils.x;

 import java.util.ArrayList;

 public class FlowLayoutActivity extends AppCompatActivity {

     @ViewInject(R.id.flow_button)

     private Button addTextButton;

     @ViewInject(R.id.flow_view_group)

     private FlowGroupView flowView;

     private ArrayList<String> names;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_flow_layout);

         x.view().inject(this);

         setTwoFlowLayout();

         addTextButton.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 addTextView("添加1");

             }

         });

     }

     private void setTwoFlowLayout() {

         //添加数据

         names = new ArrayList<String>();

         names.add("降龙十八掌");

         names.add("黯然销魂掌");

         names.add("左右互搏术");

         names.add("七十二路空明拳");

         names.add("小无相功");

         names.add("拈花指");

         names.add("打狗棍法");

         names.add("蛤蟆功");

         names.add("九阴白骨爪");

         names.add("一招半式闯江湖");

         names.add("醉拳");

         names.add("龙蛇虎豹");

         names.add("葵花宝典");

         names.add("吸星大法");

         names.add("如来神掌警示牌");

         //为布局添加内容

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

             addTextView(names.get(i));

         }

     }

     /**

      * 动态添加布局

      * @param str

      */

     private void addTextView(String str) {

         TextView child = new TextView(this);

         ViewGroup.MarginLayoutParams params = new ViewGroup.MarginLayoutParams(ViewGroup.MarginLayoutParams.WRAP_CONTENT, ViewGroup.MarginLayoutParams.WRAP_CONTENT);

         params.setMargins(5, 5, 5, 5);

         child.setLayoutParams(params);

         child.setBackgroundResource(R.drawable.flag);

         child.setText(str);

         child.setTextColor(Color.WHITE);

         initEvents(child);//监听

         flowView.addView(child);

     }

     /**

      * 为每个view 添加点击事件

      */

     private void initEvents(final TextView tv){

         tv.setOnClickListener(new View.OnClickListener() {

             @Override

             public void onClick(View v) {

                 Toast.makeText(FlowLayoutActivity.this, tv.getText().toString(), Toast.LENGTH_SHORT).show();

             }

         });

     }

 }