Android开发类似微信九格宫图片

一些动态，心情，晒单都有可能用到九宫格形式显示图片

自定义控件：NineGridLayout

public class NineGridLayout extends ViewGroup {

    /**
     * 图片之间的间隔
     */
    private int gap;
    private int columns;//
    private int rows;//
    private List listData;
    private int totalWidth;
    private ArrayList<PhotoInfo> ttImageInfoListS;
    private Context mContext;
    /**
     * 图片选择工具
     */
    private PhotoUtils utils = null;

    public NineGridLayout(Context context) {
        super(context);
    }

    public NineGridLayout(Context context, AttributeSet attrs) {

        super(context, attrs);

        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.nineGridLayout);

        int marginWidth = typedArray.getInt(R.styleable.nineGridLayout_marginWidth,34);
        LogUtils.i("marginWidth",marginWidth+"");
        totalWidth = Utils.getScreenWidthPx(context) - Utils.dip2px(context, marginWidth);

        typedArray.recycle();

        gap = Utils.dip2px(context, 5);
        mContext = context;

    }


    //计算出ChildView的大小
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);
        setMeasuredDimension(widthSpecSize, heightSpecSize);
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);