@Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    // 獲得它的父容器為它設(shè)置的測量模式和大小
    int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
    int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
    int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
    int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

    // 如果是warp_content情況下，記錄寬和高
    int width = 0;
    int height = 0;

    //記錄每一行的寬度，width不斷取最大寬度
    int lineWidth = 0;
    //記錄每一行的寬度，不斷累加每行最大高度獲取height
    int lineHeight = 0;

    //獲取子View的數(shù)量
    int childCount = getChildCount();
    //遍歷每個子元素
    for (int i = 0; i < childCount; i++) {
      //獲取每一個子View
      View childView = getChildAt(i);
      //測量每一個子View的寬和高
      measureChild(childView,widthMeasureSpec,heightMeasureSpec);
      //得到子View的lp
      LayoutParam lp = (LayoutParam) childView.getLayoutParams();
      //當(dāng)前子View實際占據(jù)的寬度
      int childWidth = childView.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
      //當(dāng)前子View實際占據(jù)的高度
      int childHeight = childView.getMeasuredHeight() + lp.bottomMargin + lp.topMargin;

      //如果加入當(dāng)前childView，超出最大寬度，則得到目前最大寬度給width，類加height 然后開啟新行
      if (lineWidth + childWidth > sizeWidth) {
        // 取最大的寬度
        width = Math.max(lineWidth, childWidth);
        //重新開啟新行，重新計算
        lineWidth = childWidth;
        //疊加當(dāng)前高度
        height += childHeight;
        //記錄下一行高度
        lineHeight = childHeight;
      }else {
        // 累加值lineWidth,lineHeight取最大高度
        lineWidth += childWidth;
        lineHeight = Math.max(lineHeight,childHeight);
      }
      // 如果是最后一個，則將當(dāng)前記錄的最大寬度和當(dāng)前l(fā)ineWidth做比較
      if (i == childCount - 1) {
        width = Math.max(width,lineWidth);
        height += lineHeight;
      }
    }
    setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY?sizeWidth:width,modeHeight == MeasureSpec.EXACTLY?sizeHeight:height);
  }

  //存儲所有的View，按行記錄
  private List<List<View>> mAllViews = new ArrayList<>();
  //記錄每一行的最大高度
  private List<Integer> mLineHeight = new ArrayList<>();
  @Override
  protected void onLayout(boolean changed, int l, int t, int r, int b) {
    mAllViews.clear();
    mLineHeight.clear();

    int lineWidth = 0;
    int lineHeight = 0;

    int width = getWidth();

    int childCount = getChildCount();
    // 存儲每一行所有的childView
    List<View> lineViews = new ArrayList<>();
    for (int i = 0; i < childCount; i++) {
      View childView = getChildAt(i);
      LayoutParam lp = (LayoutParam) childView.getLayoutParams();
      int childWidth = childView.getMeasuredWidth() + lp.rightMargin + lp.leftMargin;
      int childHeight = childView.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;

      if (lineWidth + childWidth > width) {
        // 記錄這一行所有的View以及最大高度
        mLineHeight.add(lineHeight);
        // 將當(dāng)前行的childView保存，然后開啟新的ArrayList保存下一行的childView
        mAllViews.add(lineViews);
        lineWidth = 0;
        lineViews = new ArrayList<>();
      }
      //如果不需要換行，則累加
      lineWidth += childWidth;
      lineHeight = Math.max(lineHeight,childHeight);
      lineViews.add(childView);
    }
    // 記錄最后一行
    mAllViews.add(lineViews);
    mLineHeight.add(lineHeight);

    int left = 0;
    int top = 0;

    // 得到總行數(shù)
    int size = mAllViews.size();

    for (int i = 0; i < size; i++) {
      // 每一行的所有的views
      lineViews = mAllViews.get(i);
      // 當(dāng)前行的最大高度
      lineHeight = mLineHeight.get(i);

      for (View view : lineViews) {
        LayoutParam lp = (LayoutParam) view.getLayoutParams();
        //計算childView的left,top,right,bottom
        int lc = left + lp.leftMargin;
        int tc = top + lp.topMargin;
        int rc = lc + view.getMeasuredWidth();
        int bc = tc + view.getMeasuredHeight();
        view.layout(lc,tc,rc,bc);
        left += view.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
      }
      left = 0;
      top += lineHeight;
    }
  }

public class MainActivity extends AppCompatActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    FlowLayout flowLayout = ((FlowLayout) findViewById(R.id.flowLayout));
    FlowLayout.LayoutParam params = new    FlowLayout.LayoutParam(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    params.setMargins(10,10,10,10);
    for (int i = 0; i < 10; i++) {
      TextView textView = new TextView(this);
      textView.setPadding(i * 10,10,i * 10,10);
      textView.setBackgroundColor(Color.BLUE);
      textView.setText("哈哈哈哈");
      textView.setTextColor(Color.WHITE);
      textView.setLayoutParams(params);
      flowLayout.addView(textView);
    }
  }
}

@Override
  protected LayoutParams generateDefaultLayoutParams() {
    return new LayoutParam(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
  }

  @Override
  public LayoutParams generateLayoutParams(AttributeSet attrs) {
    return new LayoutParam(getContext(),attrs);
  }

  @Override
  protected LayoutParams generateLayoutParams(LayoutParams p) {
    return new LayoutParam(p);
  }

  public static class LayoutParam extends MarginLayoutParams{

    public LayoutParam(Context c, AttributeSet attrs) {
      super(c, attrs);
    }

    public LayoutParam(@Px int width, @Px int height) {
      super(width, height);
    }

    public LayoutParam(MarginLayoutParams source) {
      super(source);
    }

    public LayoutParam(LayoutParams source) {
      super(source);
    }
  }