1.创建FlowLayout类
public class FlowLayout extends ViewGroup {
private List<Line> mLines = new ArrayList<Line>(); // 用来记录描述有多少行View
private Line mCurrrenLine; // 用来记录当前已经添加到了哪一行
private int mHorizontalSpace = 40;
private int mVerticalSpace = mHorizontalSpace;
private int mMaxLines = -1;
public int getMaxLines() {
return mMaxLines;
}
public void setMaxLines(int maxLines) {
mMaxLines = maxLines;
}
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public FlowLayout(Context context) {
super(context);
}
public void setSpace(int horizontalSpace, int verticalSpace) {
this.mHorizontalSpace = horizontalSpace;
this.mVerticalSpace = verticalSpace;
}
public void clearAll(){
mLines.clear();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 清空
mLines.clear();
mCurrrenLine = null;
int layoutWidth = MeasureSpec.getSize(widthMeasureSpec);
// 获取行最大的宽度
int maxLineWidth = layoutWidth - getPaddingLeft() - getPaddingRight();
// 测量孩子
int count = getChildCount();
for (int i = 0; i < count; i++)
{
View view = getChildAt(i);
// 如果孩子不可见
if (view.getVisibility() == View.GONE)
{
continue;
}
// 测量孩子
measureChild(view, widthMeasureSpec, heightMeasureSpec);
// 往lines添加孩子
if (mCurrrenLine == null)
{
// 说明还没有开始添加孩子
mCurrrenLine = new Line(maxLineWidth, mHorizontalSpace);
// 添加到 Lines中
mLines.add(mCurrrenLine);
// 行中一个孩子都没有
mCurrrenLine.addView(view);
}
else
{
// 行不为空,行中有孩子了
boolean canAdd = mCurrrenLine.canAdd(view);
if (canAdd) {
// 可以添加
mCurrrenLine.addView(view);
}
else {
// 不可以添加,装不下去
// 换行
if (mMaxLines >0){
if (mLines.size()<mMaxLines){
// 新建行
mCurrrenLine = new Line(maxLineWidth, mHorizontalSpace);
// 添加到lines中
mLines.add(mCurrrenLine);
// 将view添加到line
mCurrrenLine.addView(view);
}
}else {
// 新建行
mCurrrenLine = new Line(maxLineWidth, mHorizontalSpace);
// 添加到lines中
mLines.add(mCurrrenLine);
// 将view添加到line
mCurrrenLine.addView(view);
}
}
}
}
// 设置自己的宽度和高度
int measuredWidth = layoutWidth;
// paddingTop + paddingBottom + 所有的行间距 + 所有的行的高度
float allHeight = 0;
for (int i = 0; i < mLines.size(); i++)
{
float mHeigth = mLines.get(i).mHeigth;
// 加行高
allHeight += mHeigth;
// 加间距
if (i != 0)
{
allHeight += mVerticalSpace;
}
}
int measuredHeight = (int) (allHeight + getPaddingTop() + getPaddingBottom() + 0.5f);
setMeasuredDimension(measuredWidth, measuredHeight);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
// 给Child 布局---> 给Line布局
int paddingLeft = getPaddingLeft();
int offsetTop = getPaddingTop();
for (int i = 0; i < mLines.size(); i++)
{
Line line = mLines.get(i);
// 给行布局
line.layout(paddingLeft, offsetTop);
offsetTop += line.mHeigth + mVerticalSpace;
}
}
class Line
{
// 属性
private List<View> mViews = new ArrayList<View>(); // 用来记录每一行有几个View
private float mMaxWidth; // 行最大的宽度
private float mUsedWidth; // 已经使用了多少宽度
private float mHeigth; // 行的高度
private float mMarginLeft;
private float mMarginRight;
private float mMarginTop;
private float mMarginBottom;
private float mHorizontalSpace; // View和view之间的水平间距
// 构造
public Line(int maxWidth, int horizontalSpace) {
this.mMaxWidth = maxWidth;
this.mHorizontalSpace = horizontalSpace;
}
// 方法
/**
* 添加view，记录属性的变化
*
* @param view
*/
public void addView(View view)
{
// 加载View的方法
int size = mViews.size();
int viewWidth = view.getMeasuredWidth();
int viewHeight = view.getMeasuredHeight();
// 计算宽和高
if (size == 0)
{
// 说还没有添加View
if (viewWidth > mMaxWidth)
{
mUsedWidth = mMaxWidth;
}
else
{
mUsedWidth = viewWidth;
}
mHeigth = viewHeight;
}
else
{
// 多个view的情况
mUsedWidth += viewWidth + mHorizontalSpace;
mHeigth = mHeigth < viewHeight ? viewHeight : mHeigth;
}
// 将View记录到集合中
mViews.add(view);
}
/**
* 用来判断是否可以将View添加到line中
*
* @param view
* @return
*/
public boolean canAdd(View view)
{
// 判断是否能添加View
int size = mViews.size();
if (size == 0) { return true; }
int viewWidth = view.getMeasuredWidth();
// 预计使用的宽度
float planWidth = mUsedWidth + mHorizontalSpace + viewWidth;
if (planWidth > mMaxWidth)
{
// 加不进去
return false;
}
return true;
}
/**
* 给孩子布局
*
* @param offsetLeft
* @param offsetTop
*/
public void layout(int offsetLeft, int offsetTop)
{
// 给孩子布局
int currentLeft = offsetLeft;
int size = mViews.size();
// 判断已经使用的宽度是否小于最大的宽度
float extra = 0;
float widthAvg = 0;
if (mMaxWidth > mUsedWidth)
{
extra = mMaxWidth - mUsedWidth;
widthAvg = extra / size;
}
for (int i = 0; i < size; i++)
{
View view = mViews.get(i);
int viewWidth = view.getMeasuredWidth();
int viewHeight = view.getMeasuredHeight();
// 判断是否有富余
if (widthAvg != 0)
{
// 改变宽度,变为不改变,避免最后一行因label不足,单个label变宽
//int newWidth = (int) (viewWidth + widthAvg + 0.5f);
int newWidth = viewWidth;
int widthMeasureSpec = MeasureSpec.makeMeasureSpec(newWidth, MeasureSpec.EXACTLY);
int heightMeasureSpec = MeasureSpec.makeMeasureSpec(viewHeight, MeasureSpec.EXACTLY);
view.measure(widthMeasureSpec, heightMeasureSpec);
viewWidth = view.getMeasuredWidth();
viewHeight = view.getMeasuredHeight();
}
// 布局
int left = currentLeft;
int top = (int) (offsetTop + (mHeigth - viewHeight) / 2 +
0.5f);
// int top = offsetTop;
int right = left + viewWidth;
int bottom = top + viewHeight;
view.layout(left, top, right, bottom);
currentLeft += viewWidth + mHorizontalSpace;
}
}
}
}
2.布局
<com.example.administrator.day04.widgit.FlowLayout
android:id="@+id/fl"
android:layout_width="match_parent"
android:layout_height="match_parent"></com.example.administrator.day04.widgit.FlowLayout>
3.创建xml文件
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:maxLines="1"
android:ellipsize="end"
android:gravity="center"
android:paddingLeft="12dp"
android:paddingRight="12dp"
<!--创建drawable-->
android:background="@drawable/bg_e7e7e7_r30"
android:paddingTop="2dp"
android:paddingBottom="2dp"
<!--颜色-->
android:textColor="@color/c_636363"
android:textSize="14sp"/>
4.创建的drawable
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp" />
<solid android:color="@color/c_e7e7e7"/>
</shape>
for (int i = 0; i < list.size(); i++) {
TextView label = (TextView) View.inflate(getActivity(), R.layout.item_label, null);
//绑定数据
final String data = list.get(i);
//绑定数据
label.setText(data);
label.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(), finalData, Toast.LENGTH_SHORT).show();
}
});
//加到容器中,parent是FlowLayout
mFl.addView(label);
}
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