自定义控件实现微博图片九宫格效果

1：自定义GridView

public class NineGridlayout extends ViewGroup {

    private NineGridAdapter adapter;
    private OnItemClickListerner onItemClickListerner;

    // 行间距
    private int lineSpace;
    //列间距
    private int gap;

    private final int DEFAULT_WIDTH = 140;

    private int columns;//
    private int rows;//
    private int totalWidth;
    private Context context;
    int singleWidth = 0, singleHeight = 0;
    private int defaultWidth, defaultHeight;

    private int oldCount;

    public NineGridlayout(Context context) {
        this(context, null);
    }

    public NineGridlayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public NineGridlayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context = context;
        gap = dip2px(context, 10);
        lineSpace = dip2px(context,10);
        defaultWidth = defaultHeight = dip2px(context, DEFAULT_WIDTH);
    }

    public void setDefaultWidth(int defaultWidth) {
        this.defaultWidth = defaultWidth;
    }

    public void setDefaultHeight(int defaultHeight) {
        this.defaultHeight = defaultHeight;
    }

    public void setAdapter(NineGridAdapter adapter) {
        this.adapter = adapter;
        if (adapter == null) {
            return;
        }
        //初始化布局形状
        generateChildrenLayout(adapter.getCount());
        //这里做一个重用view的处理
//        if (oldCount == 0) {
        removeAllViews();
        for (int i = 0; i < adapter.getCount(); i++) {
            View itemView = adapter.getView(i, null);
            addView(itemView, generateDefaultLayoutParams());
        }
//        }
         /*else {
            //以前添加过view
            int newViewCount = adapter.getCount();
            if (oldCount > newViewCount) {
                removeViews(newViewCount - 1, oldCount - newViewCount);