自定义Textview显示自动换行

package com.sanbanhui.helper.widget;

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

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

/**
* 自定义流布局
* @author zhouyou
*/
public class ZFlowLayout extends ViewGroup {

// 存储所有子View
private List<List<View>> mAllChildViews = new ArrayList<>();
// 每一行的高度
private List<Integer> mLineHeight = new ArrayList<>();
public ZFlowLayout(Context context) {
this(context, null);
}

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

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

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 父控件传进来的宽度和高度以及对应的测量模式
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

// 如果当前ViewGroup的宽高为wrap_content的情况
int width = 0;// 自己测量的 宽度
int height = 0;// 自己测量的高度
// 记录每一行的宽度和高度
int lineWidth = 0;
int lineHeight = 0;

// 获取子view的个数
int childCount = getChildCount();
for(int i = 0;i < childCount; i++){
View child = getChildAt(i);
// 测量子View的宽和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
// 得到LayoutParams
MarginLayoutParams lp = (MarginLayoutParams) 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;
// 换行时候
if(lineWidth + childWidth > sizeWidth){
// 对比得到最大的宽度
width = Math.max(width, lineWidth);
// 重置lineWidth
lineWidth = childWidth;
// 记录
4000
行高
height += lineHeight;
lineHeight = childHeight;
}else{// 不换行情况
// 叠加行宽
lineWidth += childWidth;
// 得到最大行高
lineHeight = Math.max(lineHeight, childHeight);
}
// 处理最后一个子View的情况
if(i == childCount -1){
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
// wrap_content
setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width,
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height);
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mAllChildViews.clear();
mLineHeight.clear();
// 获取当前ViewGroup的宽度
int width = getWidth();

int lineWidth = 0;
int lineHeight = 0;
// 记录当前行的view
List<View> lineViews = new ArrayList<View>();
int childCount = getChildCount();
for(int i = 0;i < childCount; 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){
// 记录LineHeight
mLineHeight.add(lineHeight);
// 记录当前行的Views
mAllChildViews.add(lineViews);
// 重置行的宽高
lineWidth = 0;
lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
// 重置view的集合
lineViews = new ArrayList();
}
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin);
lineViews.add(child);
}
// 处理最后一行
mLineHeight.add(lineHeight);
mAllChildViews.add(lineViews);

// 设置子View的位置
int left = 0;
int top = 0;
// 获取行数
int lineCount = mAllChildViews.size();
for(int i = 0; i < lineCount; i ++){
// 当前行的views和高度
lineViews = mAllChildViews.get(i);
lineHeight = mLineHeight.get(i);
for(int j = 0; j < lineViews.size(); j ++){
View child = lineViews.get(j);
// 判断是否显示
if(child.getVisibility() == View.GONE){
continue;
}
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int cLeft = left + lp.leftMargin;
int cTop = top + lp.topMargin;
int cRight = cLeft + child.getMeasuredWidth();
int cBottom = cTop + child.getMeasuredHeight();
// 进行子View进行布局
child.layout(cLeft, cTop, cRight, cBottom);
left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
}
left = 0;
top += lineHeight;
}

}

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

public void loadInfo() {

ViewGroup.MarginLayoutParams layoutParams = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(0, 0, 8, 8);// 设置边距
listName.clear();
hyContent.removeAllViews();
for (int i = 0; i < list_show.size(); i++) {
if (list_show.get(i).isFlg() == true) {
final RelativeLayout relativeLayout = (RelativeLayout) LayoutInflater.from(this).inflate(R.layout.item_hangye_type, null);
tvTitle = (TextView) relativeLayout.findViewById(R.id.hangye_type_tv);
img = (ImageView) relativeLayout.findViewById(R.id.hangye_type_image);

tvTitle.setText(list_show.get(i).getName());
hyContent.addView(relativeLayout, layoutParams);

}
}

}