Add the layout of the child view can automatically wrap

AutoLineFeedLayout

public class AutoLineFeedLayout extends RelativeLayout {
    // Space between child views.
    private final static int PAD_H = 5, PAD_V = 5;
     
    private int mHeight;
    /**
     * 
     * <p>Description: 构造方法</p>
     *@param context 上下文
     *
     * @since 2012-8-14 上午11:44:58
     * @author inferjay
     */
    public AutoLineFeedLayout(Context context) {
        super(context);
    }
    /**
     * 
     * <p>Description: 构造方法</p>
     *
     *@param context 上下文
     *@param attrs	 属性集
     *
     * @since 2012-8-14 上午11:44:58
     * @author inferjay
     */
    public AutoLineFeedLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    /**
     * 
     * <p>Description: 测量控件大小</p>
     * @param widthMeasureSpec 宽
     * @param heightMeasureSpec 高
     *
     * @since 2012-10-25 下午03:17:16
     * @author inferjay
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        assert (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED);
        final int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
        int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
        final int count = getChildCount();//获取子元素个数
        int xpos = getPaddingLeft();//获取左内边距
        int ypos = getPaddingTop();//获取top内边距
        int childHeightMeasureSpec;
        if(MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST)
            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
        else
            childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
        mHeight = 0;
        for(int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if(child.getVisibility() != GONE) {
                child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), childHeightMeasureSpec);
                final int childw = child.getMeasuredWidth();
                mHeight = Math.max(mHeight, child.getMeasuredHeight() + PAD_V);
                if(xpos + childw > width) {
                    xpos = getPaddingLeft();
                    ypos += mHeight;
                }
                xpos += childw + PAD_H;
            }
        }
        if(MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
            height = ypos + mHeight;
        } else if(MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
            if(ypos + mHeight < height) {
                height = ypos + mHeight;
            }
        }
//        height += 5; // Fudge to avoid clipping bottom of last row.
//        Logger.print("recipitents", "height =" + height);
        setMeasuredDimension(width, height);
    } 
    
    /**
     * 
     * <p>Description: 绘制子控件布局</p>
     * @param changed  是否改变
     * @param l 左
     * @param t 上
     * @param r 右
     * @param b 底
     *
     * @since 2012-10-25 下午03:18:01
     * @author inferjay
     */
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        final int width = r - l;
        int xpos = getPaddingLeft();
        int ypos = getPaddingTop();
        for(int i = 0; i < getChildCount(); i++) {
            final View child = getChildAt(i);
            if(child.getVisibility() != GONE) {
                final int childw = child.getMeasuredWidth();
                final int childh = child.getMeasuredHeight();
                if(xpos + childw > width) {
                    xpos = getPaddingLeft();
                    ypos += mHeight;
                }
                child.layout(xpos, ypos, xpos + childw, ypos + childh);
                xpos += childw + PAD_H;
            }
        }
    } 
}