理ろぐ

private int _widthMeasureSpec = 0;
private int _heightMeasureSpec = 0;


@Override
protected void onLayout(boolean changed, int left, int top, int right,
		int bottom) {

	ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(
				ViewGroup.LayoutParams.FILL_PARENT
				, ViewGroup.LayoutParams.FILL_PARENT);
	
	//inflaterを使ってxmlのレイアウトをViewに反映する
	LayoutInflater inflater = (LayoutInflater)getContext()
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	View v = inflater.inflate(R.layout.layout, null);
	addViewInLayout(v, -1, lp);

	//子要素に必要な大きさを計測させる
	int padding = 0;
	int childWidthSpec = ViewGroup.getChildMeasureSpec(_widthMeasureSpec, padding * 2, lp.width);
	int childHeightSpec = ViewGroup.getChildMeasureSpec(_heightMeasureSpec, padding * 2, lp.height);
	v.measure(childWidthSpec, childHeightSpec);

	//子要素の描画範囲でレイアウトを作成する
	v.layout(padding, padding, padding + v.getMeasuredWidth(), padding + v.getMeasuredHeight());

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	_widthMeasureSpec = widthMeasureSpec;
	_heightMeasureSpec = heightMeasureSpec;
}