Android(安卓)space控件：间隙留白

Space is a lightweight View subclass that may be used to create gaps between components in general purpose layouts.

Space 是一个轻量级的 View 子类，可用于在通用布局中的组件之间创建间隙。

public final class Space extends View {    /**     * {@inheritDoc}     */    public Space(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);        if (getVisibility() == VISIBLE) {            setVisibility(INVISIBLE);        }    }    /**     * {@inheritDoc}     */    public Space(Context context, AttributeSet attrs, int defStyleAttr) {        this(context, attrs, defStyleAttr, 0);    }    /**     * {@inheritDoc}     */    public Space(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    /**     * {@inheritDoc}     */    public Space(Context context) {        //noinspection NullableProblems        this(context, null);    }    /**     * Draw nothing.     *     * @param canvas an unused parameter.     */    @Override    public void draw(Canvas canvas) {    }    /**     * Compare to: {@link View#getDefaultSize(int, int)}     * If mode is AT_MOST, return the child size instead of the parent size     * (unless it is too big).     */    private static int getDefaultSize2(int size, int measureSpec) {        int result = size;        int specMode = MeasureSpec.getMode(measureSpec);        int specSize = MeasureSpec.getSize(measureSpec);        switch (specMode) {            case MeasureSpec.UNSPECIFIED:                result = size;                break;            case MeasureSpec.AT_MOST:                result = Math.min(size, specSize);                break;            case MeasureSpec.EXACTLY:                result = specSize;                break;        }        return result;    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        setMeasuredDimension(                getDefaultSize2(getSuggestedMinimumWidth(), widthMeasureSpec),                getDefaultSize2(getSuggestedMinimumHeight(), heightMeasureSpec));    }}

draw方法没有任何声明，不需要进行渲染，可以进行控件之间的间隙。

参考：

https://blog.csdn.net/dajian35/article/details/74842681

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