public class SquareLayout extends RelativeLayout { public SquareLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); }
public SquareLayout(Context context, AttributeSet attrs) { super(context, attrs); } public SquareLayout(Context context) { super(context); } @SuppressWarnings("unused") @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // For simple implementation, or internal size is always 0. // We depend on the container to specify the layout size of // our view. We can't really know what it is since we will be // adding and removing different arbitrary views and do not // want the layout to change as this happens. setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec)); // Children are just made to fill our space. int childWidthSize = getMeasuredWidth(); int childHeightSize = getMeasuredHeight(); //高度和宽度一样 heightMeasureSpec = widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY); super.onMeasure(widthMeasureSpec, heightMeasureSpec); }}
