自定义流式布局控件FlowLayout

/** * 流式布局 FlowLayout 用法和LineLayout一样,可自动换行 */public class FlowLayout extends ViewGroup {    private static final int DEFAULT_HORIZONTAL_SPACING = 5;    private static final int DEFAULT_VERTICAL_SPACING = 5;    private int mVerticalSpacing;    private int mHorizontalSpacing;        public FlowLayout(Context context) {        super(context);    }    public FlowLayout(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout);        try {            mHorizontalSpacing = a.getDimensionPixelSize(                    R.styleable.FlowLayout_horizontal_spacing, DEFAULT_HORIZONTAL_SPACING);            mVerticalSpacing = a.getDimensionPixelSize(                    R.styleable.FlowLayout_vertical_spacing, DEFAULT_VERTICAL_SPACING);        } finally {            a.recycle();        }    }    public void setHorizontalSpacing(int pixelSize) {        mHorizontalSpacing = pixelSize;    }    public void setVerticalSpacing(int pixelSize) {        mVerticalSpacing = pixelSize;    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int myWidth = resolveSize(0, widthMeasureSpec);        int paddingLeft = getPaddingLeft();        int paddingTop = getPaddingTop();        int paddingRight = getPaddingRight();        int paddingBottom = getPaddingBottom();        int childLeft = paddingLeft;        int childTop = paddingTop;        int lineHeight = 0;        // Measure each child and put the child to the right of previous child        // if there's enough room for it, otherwise, wrap the line and put the child to next line.        for (int i = 0, childCount = getChildCount(); i < childCount; ++i) {            View child = getChildAt(i);            if (child.getVisibility() != View.GONE) {                measureChild(child, widthMeasureSpec, heightMeasureSpec);            } else {                continue;            }            int childWidth = child.getMeasuredWidth();            int childHeight = child.getMeasuredHeight();            lineHeight = Math.max(childHeight, lineHeight);            if (childLeft + childWidth + paddingRight > myWidth) {                childLeft = paddingLeft;                childTop += mVerticalSpacing + lineHeight;                lineHeight = childHeight;            } else {                childLeft += childWidth + mHorizontalSpacing;            }        }        int wantedHeight = childTop + lineHeight + paddingBottom;        setMeasuredDimension(myWidth, resolveSize(wantedHeight, heightMeasureSpec));    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        int myWidth = r - l;        int paddingLeft = getPaddingLeft();        int paddingTop = getPaddingTop();        int paddingRight = getPaddingRight();        int childLeft = paddingLeft;        int childTop = paddingTop;        int lineHeight = 0;        for (int i = 0, childCount = getChildCount(); i < childCount; ++i) {            View childView = getChildAt(i);            if (childView.getVisibility() == View.GONE) {                continue;            }            int childWidth = childView.getMeasuredWidth();            int childHeight = childView.getMeasuredHeight();            lineHeight = Math.max(childHeight, lineHeight);            if (childLeft + childWidth + paddingRight > myWidth) {                childLeft = paddingLeft;                childTop += mVerticalSpacing + lineHeight;                lineHeight = childHeight;            }            childView.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);            childLeft += childWidth + mHorizontalSpacing;        }    }}

需要添加的style

<declare-styleable name="FlowLayout">    <attr name="horizontal_spacing" format="dimension" />    <attr name="vertical_spacing" format="dimension" /></declare-styleable>