Android自定义ViewGroup中LayoutParam的应用

在自定义ViewGroup中,也需要传递一些特殊布局参数,可以通过继承ViewGroup.LayoutParam来实现,不如:

public class MyViewGroup extends ViewGroup {

    private int mWidth;

    private int mHeight;


    public static class LayoutParams extends ViewGroup.LayoutParams {

        public int mX;

        public int mY;


        public LayoutParams(int width, int height, int x, int y) {

            super(width, height);


            mX = x;

            mY = y;

        }

    }


在上面的例子中,我们加入了x,y参数,如何使用这些参数?

    @Override

    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        int count = getChildCount();

        for ( int i = 0; i < count; ++i ) {

            View v = this.getChildAt(i);

            LayoutParams lp = (LayoutParams)v.getLayoutParams();

            v.layout(lp.mX, lp.mY, lp.mX + lp.width, lp.mY + lp.height);

        }

    }



在什么地方传递这些参数呢?

MyViewGroup mvg = new MyViewGroup(this)

MyViewGroup.LayoutParams param = new MyViewGroup.LayoutParams(20,34, 12, 11);

mvg.addView(v, param);


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