Android自定义ViewGroup实现流式布局

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  allLines.clear();
  //测量容器的宽和高
  int cOntainerMeasuredWidth= MeasureSpec.getSize(widthMeasureSpec);
  //这个集合用于保存单行
  ArrayList OneLine= null;
  for (int i = 0; i  getUsablewWidth(containerMeasuredWidth, oneLine,oneLine.size())) {
    OneLine= new ArrayList();
    allLines.add(oneLine);
   }
   oneLine.add(child);
 
  }
 
  int lineNumber = allLines.size();
  int allLinesHeight = getChildAt(0).getMeasuredHeight() * lineNumber;
  int verticalTotalpadding = getPaddingBottom() + getPaddingTop();
  //垂直总的spcing
  int verticalTotalSpcing = 8 * (lineNumber - 1);
  //容器的高 = 所有View的高 + 垂直方向的Padding + 垂直总的spcing
  int cOntainerMeasureHeight= allLinesHeight + verticalTotalpadding + verticalTotalSpcing;
  setMeasuredDimension(containerMeasuredWidth, containerMeasureHeight);
 }

private int getUsablewWidth(int containerMeasuredWidth, ArrayList oneLine,int needSpacingCount) {
  int OneLineWidth= 0;
  for (View view : oneLine) {
   oneLineWidth += view.getMeasuredWidth();
  }
  //水平方向两边的padding
  int horizotalPadding = getPaddingLeft() + getPaddingRight();
  int horizOntalTotalSpcing= horizotalPadding * needSpacingCount;
  int usablewWidth = containerMeasuredWidth - oneLineWidth - horizotalPadding - horizontalTotalSpcing;
  return usablewWidth;
 }

protected void onLayout(boolean changed, int l, int t, int r, int b) {
  int tempRight = 0;//保存一行中上一个View的Right
  int tempBottom = 0;//保存上一行View的Bottom位置
  ///遍历第一排
  for (int row = 0; row  OneLines= allLines.get(row);
   //计算一行中每个Veiw可以分到的平均宽度
   int totalUsableWidth= getUsablewWidth(getMeasuredWidth(), oneLines,oneLines.size()-1);
   int averageUsablewWidth = totalUsableWidth/oneLines.size();
   //遍历的是一行的内容
   for (int column = 0; column 

public class MainActivity extends Activity {
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 FlowLayout flowLayout = new FlowLayout(this);
 flowLayout.setPadding(6, 6, 6, 6);
 
 for (String text : list) {
    TextView textView = new TextView(this);
    textView.setBackgroundResource(R.drawable.bg_text);
    textView.setGravity(Gravity.CENTER);
    textView.setPadding(6, 6, 6, 6);
    textView.setText(text);
    textView.setTextSize(20);
    flowLayout.addView(textView);
   }
 
 setContentView(flowLayout);
 } 
 }