欲实现如下效果：
思路很简单就2步：
1、测量出ViewGroup的大小
2、找出子View的位置
若要实现动态添加标签view，就要实现ViewGroup的onMeasure（）、onLayout（）方法，这两个方法可由该ViewGroup的requestLayout（）方法触发，
onMeasure是对ViewGroup的大小计算，onLayout是针对View（可以是子View也可以是本View）的位置设置
关于这几个方法的流程图如下：
/**
* 流式标签(动态的，根据传入的数据动态添加标签)
*/
public class CustomerFlowLayout extends ViewGroup { private List<String> mTags = new ArrayList<String>(); public CustomerFlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
} public CustomerFlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
} public CustomerFlowLayout(Context context) {
super(context);
} @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec); //当前ViewGroup的总高度
int totalHeight= 0;
//所有行中的最大宽度
int maxLineWidth = 0; //当前行的最大高度
int lineMaxHeight = 0;
//当前行的总宽度
int currentLineWidth = 0; //每个childView所占用的宽度
int childViewWidthSpace = 0;
//每个childView所占用的高度
int childViewHeightSpace = 0; int count = getChildCount();
MarginLayoutParams layoutParams; for(int i = 0; i < count; i++){
View child = getChildAt(i); if(child.getVisibility() != View.GONE){//只有当这个View能够显示的时候才去测量
//测量每个子View，以获取子View的宽和高
measureChild(child, widthMeasureSpec, heightMeasureSpec); layoutParams = (MarginLayoutParams) child.getLayoutParams(); childViewWidthSpace = child.getMeasuredWidth() + layoutParams.leftMargin + layoutParams.rightMargin;
childViewHeightSpace = child.getMeasuredHeight() + layoutParams.topMargin + layoutParams.bottomMargin; if(currentLineWidth + childViewWidthSpace > widthSize){//表示如果当前行再加上现在这个子View，就会超出总的规定宽度，需要另起一行
totalHeight += lineMaxHeight;
if(maxLineWidth < currentLineWidth){//如果行的最长宽度发生了变化，更新保存的最长宽度
maxLineWidth = currentLineWidth;
}
currentLineWidth = childViewWidthSpace;//另起一行后，需要重置当前行宽
lineMaxHeight = childViewHeightSpace;
}else{//表示当前行可以继续添加子元素
currentLineWidth += childViewWidthSpace;
if(lineMaxHeight < childViewHeightSpace){
lineMaxHeight = childViewHeightSpace;
}
}
}
} setMeasuredDimension(widthMode == MeasureSpec.EXACTLY ? widthSize : maxLineWidth, heightMode == MeasureSpec.EXACTLY ? heightSize : totalHeight); } @Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
//当前是第几行
int currentLine = 1;
//存放每一行的最大高度
List<Integer> lineMaxHeightList = new ArrayList<Integer>(); //每个childView所占用的宽度
int childViewWidthSpace = 0;
//每个childView所占用的高度
int childViewHeightSpace = 0; //当前行的最大高度
int lineMaxHeight = 0;
//当前行的总宽度
int currentLineWidth = 0; int count = getChildCount();
MarginLayoutParams layoutParams; for(int i = 0; i < count; i++){
int cl= 0, ct = 0, cr = 0, cb = 0;
View child = getChildAt(i);
if(child.getVisibility() != View.GONE){//只有当这个View能够显示的时候才去测量 layoutParams = (MarginLayoutParams) child.getLayoutParams();
childViewWidthSpace = child.getMeasuredWidth() + layoutParams.leftMargin + layoutParams.rightMargin;
childViewHeightSpace = child.getMeasuredHeight() + layoutParams.topMargin + layoutParams.bottomMargin; System.out.println("getWidth()---->"+getWidth()); if(currentLineWidth + childViewWidthSpace > getWidth()){//表示如果当前行再加上现在这个子View，就会超出总的规定宽度，需要另起一行
lineMaxHeightList.add(lineMaxHeight);//此时先将这一行的最大高度加入到集合中
//新的一行，重置一些参数
currentLine++;
currentLineWidth = childViewWidthSpace;
lineMaxHeight = childViewHeightSpace; cl = layoutParams.leftMargin;
if(currentLine > 1){
for(int j = 0; j < currentLine - 1; j++){
ct += lineMaxHeightList.get(j);
}
ct += layoutParams.topMargin ;
}else{
ct = layoutParams.topMargin;
}
}else{//表示当前行可以继续添加子元素
cl = currentLineWidth + layoutParams.leftMargin;
if(currentLine > 1){
for(int j = 0; j < currentLine - 1; j++){
ct += lineMaxHeightList.get(j);
}
ct += layoutParams.topMargin;
}else{
ct = layoutParams.topMargin;
}
currentLineWidth += childViewWidthSpace;
if(lineMaxHeight < childViewHeightSpace){
lineMaxHeight = childViewHeightSpace;
}
} cr = cl + child.getMeasuredWidth();
cb = ct + child.getMeasuredHeight(); child.layout(cl, ct, cr, cb); }
}
} @Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
} public void setTags(List<String> tags){
if(tags!= null){
mTags.clear();
mTags.addAll(tags);
for(int i = 0; i < mTags.size(); i++){
TextView tv = new TextView(getContext());
MarginLayoutParams lp = new MarginLayoutParams(MarginLayoutParams.WRAP_CONTENT, MarginLayoutParams.WRAP_CONTENT);
lp.setMargins(15, 15, 15, 15);
// lp.width = MarginLayoutParams.WRAP_CONTENT;
// lp.height = MarginLayoutParams.WRAP_CONTENT;
tv.setLayoutParams(lp);
tv.setBackgroundResource(R.drawable.tv_bg);
/*
* setPadding一定要在setBackgroundResource后面使用才有效！！！
* http://*.com/questions/18327498/setting-padding-for-textview-not-working
*/
tv.setPadding(15, 15, 15, 15);
tv.setTextColor(Color.WHITE); tv.setText(mTags.get(i)); tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(listener != null){
listener.onClick(v);
}
}
}); addView(tv);
}
requestLayout();
}
} private OnTagItemClickListener listener;
public interface OnTagItemClickListener{
public void onClick(View v);
}
public void setOnTagItemClickListener(OnTagItemClickListener l){
listener = l;
} }
针对在Activity中的使用：
public class MainActivity extends Activity {
private CustomerFlowLayout customerFlowLayout;
List<String> tags = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dynamic_tagflowlayout);
CustomerFlowLayout = (CustomerFlowLayout) findViewById(R.id.dynamic_tag);
customerFlowLayout.setOnTagItemClickListener(new OnTagItemClickListener() {
@Override
public void onClick(View v) {
TextView tv = (TextView) v;
Toast.makeText(MainActivity.this, tv.getText().toString(), Toast.LENGTH_SHORT).show();
}
});
initData();
customerFlowLayout.setTags(tags);
}
private void initData() {
tags.add("阳哥你好！");
tags.add("Android开发");
tags.add("新闻热点");
tags.add("热水进宿舍啦！");
tags.add("I love you");
tags.add("成都妹子");
tags.add("新余妹子");
tags.add("仙女湖");
tags.add("创新工厂");
tags.add("孵化园");
tags.add("神州100发射");
tags.add("有毒疫苗");
tags.add("顶你阳哥阳哥");
tags.add("Hello World");
tags.add("闲逛的蚂蚁");
tags.add("闲逛的蚂蚁");
tags.add("闲逛的蚂蚁");
tags.add("闲逛的蚂蚁");
tags.add("闲逛的蚂蚁");
tags.add("闲逛的蚂蚁");
}
}
上述的ViewGroup中可以添加 对标签的处理（例如：点击、选中）
参考资料：
https://blog.csdn.net/shakespeare001/article/details/51089128