HarmonyOS

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来源:https://blog.csdn.net/forever_wj/category_11128883.html

HarmonyOS之深入解析自定义组件与布局的实现

x33g5p2x  于2022-03-07 转载在 其他  
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一、概述
  • HarmonyOS 提供了一套复杂且强大的 Java UI 框架,其中 Component 提供内容显示,是界面中所有组件的基类。ComponentContainer 作为容器容纳 Component 或 ComponentContainer 对象,并对它们进行布局。
  • Java UI 框架也提供了一部分 Component 和 ComponentContainer 的具体子类,即常用的组件(比如:Text、Button、Image 等)和常用的布局(比如:DirectionalLayout、DependentLayout 等)。如果现有的组件和布局无法满足设计需求,例如仿遥控器的圆盘按钮、可滑动的环形控制器等,可以通过自定义组件和自定义布局来实现。
  • 自定义组件是由开发者定义的具有一定特性的组件,通过扩展 Component 或其子类实现,可以精确控制屏幕元素的外观,也可响应用户的点击、触摸、长按等操作。
  • 自定义布局是由开发者定义的具有特定布局规则的容器类组件,通过扩展 ComponentContainer 或其子类实现,可以将各子组件摆放到指定的位置,也可响应用户的滑动、拖拽等事件。
二、自定义组件
  • 当 Java UI 框架提供的组件无法满足设计需求时,可以创建自定义组件,根据设计需求添加绘制任务,并定义组件的属性及事件响应,完成组件的自定义。
① 常用接口
  • Component 类相关接口如下表所示:
接口名作用
setEstimateSizeListener设置测量组件的侦听器
onEstimateSize测量组件的大小以确定宽度和高度
setEstimatedSize将测量的宽度和高度设置给组件
EstimateSpec.getChildSizeWithMode基于指定的大小和模式为子组件创建度量规范
EstimateSpec.getSize从提供的度量规范中提取大小
EstimateSpec.getMode获取该组件的显示模式
addDrawTask添加绘制任务
onDraw通过绘制任务更新组件时调用
② 如何实现自定义组件
  • 以自定义圆环组件为例:在屏幕中绘制蓝色圆环,并实现点击变化圆环颜色的功能,自定义圆环组件如下所示:

  • 创建自定义组件的类,并继承 Component 或其子类,添加构造方法。示例代码如下:
public class CustomComponent extends Component{
	    public CustomComponent(Context context) {
	        super(context);
	    }
	}
  • 实现 Component.EstimateSizeListener 接口,在 onEstimateSize 方法中进行组件测量,并通过 setEstimatedSize 方法将测量的宽度和高度设置给组件。示例代码如下:
public class CustomComponent extends Component implements Component.EstimateSizeListener {
	    public CustomComponent(Context context) {
	        super(context);
	
	        ...
	
	        // 设置测量组件的侦听器
	        setEstimateSizeListener(this);
	    }
	
	    ...
	
	    @Override
	    public boolean onEstimateSize(int widthEstimateConfig, int heightEstimateConfig) {
	        int width = Component.EstimateSpec.getSize(widthEstimateConfig);
	        int height = Component.EstimateSpec.getSize(heightEstimateConfig);
	        setEstimatedSize(
	            Component.EstimateSpec.getChildSizeWithMode(width, width, Component.EstimateSpec.NOT_EXCEED),
	            Component.EstimateSpec.getChildSizeWithMode(height, height, Component.EstimateSpec.NOT_EXCEED));
	        return true;
	    }
	}
  • 需要注意:
    • 自定义组件测量出的大小需通过 setEstimatedSize 设置给组件,并且必须返回 true 使测量值生效。
    • setEstimatedSize 方法的入参携带模式信息,可使用 Component.EstimateSpec.getChildSizeWithMode 方法进行拼接。
  • 测量模式:测量组件的宽高需要携带模式信息,不同测量模式下的测量结果也不相同,需要根据实际需求选择适合的测量模式。测量模式信息如下表所示:
模式作用
UNCONSTRAINT父组件对子组件没有约束,表示子组件可以任意大小
PRECISE父组件已确定子组件的大小
NOT_EXCEED已为子组件确定了最大大小,子组件不能超过指定大小
  • 实现 Component.DrawTask 接口,在 onDraw 方法中执行绘制任务,该方法提供的画布 Canvas,可以精确控制屏幕元素的外观。在执行绘制任务之前,需要定义画笔 Paint。示例代码如下:
public class CustomComponent extends Component implements Component.DrawTask,Component.EstimateSizeListener {
	    // 圆环宽度
	    private static final float CIRCLE_STROKE_WIDTH = 100f;
	
	    // 绘制圆环的画笔
	    private Paint circlePaint;    
	    
	    public CustomComponent(Context context) {
	        super(context);
	
	        // 初始化画笔
	        initPaint();
	
	        // 添加绘制任务
	        addDrawTask(this);
	    }
	
	    private void initPaint(){
	        circlePaint = new Paint();
	        circlePaint.setColor(Color.BLUE);
	        circlePaint.setStrokeWidth(CIRCLE_STROKE_WIDTH);
	        circlePaint.setStyle(Paint.Style.STROKE_STYLE);
	    }
	
	    @Override
	    public void onDraw(Component component, Canvas canvas) {
	
	        // 在界面中绘制一个圆心坐标为(500,500),半径为400的圆
	        canvas.drawCircle(500,500,400,circlePaint);
	    }
	
	    ...
	}
  • 实现 Component.TouchEventListener 或其他事件的接口,使组件可响应用户输入。示例代码如下:
public class CustomComponent extends Component implements Component.DrawTask, Component.EstimateSizeListener, Component.TouchEventListener {
	    ...
	    public CustomComponent(Context context) {
	        ...
	
	        // 设置TouchEvent响应事件
	        setTouchEventListener(this);
	    }
	    
	    ...
	
	    @Override
	    public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
	        switch (touchEvent.getAction()) {
	            case TouchEvent.PRIMARY_POINT_DOWN:
	                circlePaint.setColor(Color.GREEN);
	                invalidate();
	                break;
	            case TouchEvent.PRIMARY_POINT_UP:
	                circlePaint.setColor(Color.YELLOW);
	                invalidate();
	                break;
	        }
	        return false;
	    }
	}
  • 需要注意:
    • 需要更新 UI 显示时,可调用 invalidate() 方法。
    • 示例中展示 TouchEventListener 为响应触摸事件,除此之外还可实现 ClickedListener 响应点击事件、LongClickedListener 响应长按事件等。
  • 在 onStart() 方法中,将自定义组件添加至 UI 界面中:
@Override
	protected void onStart(Intent intent) {
	    super.onStart(intent);
	    DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(
	        DirectionalLayout.LayoutConfig.MATCH_PARENT, DirectionalLayout.LayoutConfig.MATCH_PARENT);
	    myLayout.setLayoutConfig(config);
	
	    CustomComponent customComponent = new CustomComponent(this);
	    DirectionalLayout.LayoutConfig layoutConfig = new DirectionalLayout.LayoutConfig(1080, 1000);
	    customComponent.setLayoutConfig(layoutConfig);
	
	    myLayout.addComponent(customComponent);
	    super.setUIContent(myLayout);
	}
③ 场景示例
  • 利用自定义组件,绘制环形进度控制器,可通过滑动改变当前进度,也可响应进度的改变,UI 显示的样式也可通过设置属性进行调整。自定义环形进度控制器如下所示:

  • 示例代码如下:
public class CustomControlBar extends Component implements Component.DrawTask,
	    Component.EstimateSizeListener, Component.TouchEventListener {
	    private final static float CIRCLE_ANGLE = 360.0f;
	
	    private final static int DEF_UNFILL_COLOR = 0xFF808080;
	
	    private final static int DEF_FILL_COLOR = 0xFF1E90FF;
	
	    // 圆环轨道颜色
	    private Color unFillColor;
	
	    // 圆环覆盖颜色
	    private Color fillColor;
	
	    // 圆环宽度
	    private int circleWidth;
	
	    // 画笔
	    private Paint paint;
	
	    // 个数
	    private int count;
	
	    // 当前进度
	    private int currentCount;
	
	    // 间隙值
	    private int splitSize;
	
	    // 内圆的正切方形
	    private RectFloat centerRectFloat;
	
	    // 中心绘制的图片
	    private PixelMap image;
	
	    // 原点坐标
	    private Point centerPoint;
	
	    // 进度改变的事件响应
	    private ProgressChangeListener listener;
	
	    public CustomControlBar(Context context) {
	        super(context);
	        paint = new Paint();
	        initData();
	        setEstimateSizeListener(this);
	        setTouchEventListener(this);
	        addDrawTask(this);
	    }
	
	    // 初始化属性值
	    private void initData() {
	        unFillColor = new Color(DEF_UNFILL_COLOR);
	        fillColor = new Color(DEF_FILL_COLOR);
	        count = 10;
	        currentCount = 2;
	        splitSize = 15;
	        circleWidth = 60;
	        centerRectFloat = new RectFloat();
	        image = Utils.createPixelMapByResId(ResourceTable.Media_icon, getContext()).get();
	        listener = null;
	    }
	
	    @Override
	    public boolean onEstimateSize(int widthEstimateConfig, int heightEstimateConfig) {
	        int width = Component.EstimateSpec.getSize(widthEstimateConfig);
	        int height = Component.EstimateSpec.getSize(heightEstimateConfig);
	        setEstimatedSize(
	            Component.EstimateSpec.getChildSizeWithMode(width, width, Component.EstimateSpec.PRECISE),
	            Component.EstimateSpec.getChildSizeWithMode(height, height, Component.EstimateSpec.PRECISE)
	        );
	        return true;
	    }
	
	    @Override
	    public void onDraw(Component component, Canvas canvas) {
	        paint.setAntiAlias(true);
	        paint.setStrokeWidth(circleWidth);
	        paint.setStrokeCap(Paint.StrokeCap.ROUND_CAP);
	        paint.setStyle(Paint.Style.STROKE_STYLE);
	
	        int width = getWidth();
	        int center = width / 2;
	        centerPoint = new Point(center, center);
	        int radius = center - circleWidth / 2;
	        drawCount(canvas, center, radius);
	
	        int inRadius = center - circleWidth;
	        double length = inRadius - Math.sqrt(2) * 1.0f / 2 * inRadius;
	        centerRectFloat.left = (float) (length + circleWidth);
	        centerRectFloat.top = (float) (length + circleWidth);
	        centerRectFloat.bottom = (float) (centerRectFloat.left + Math.sqrt(2) * inRadius);
	        centerRectFloat.right = (float) (centerRectFloat.left + Math.sqrt(2) * inRadius);
	
	        // 如果图片比较小,那么根据图片的尺寸放置到正中心
	        Size imageSize = image.getImageInfo().size;
	        if (imageSize.width < Math.sqrt(2) * inRadius) {
	            centerRectFloat.left = (float) (centerRectFloat.left + Math.sqrt(2) * inRadius * 1.0f / 2 - imageSize.width * 1.0f / 2);
	            centerRectFloat.top = (float) (centerRectFloat.top + Math.sqrt(2) * inRadius * 1.0f / 2 - imageSize.height * 1.0f / 2);
	            centerRectFloat.right = centerRectFloat.left + imageSize.width;
	            centerRectFloat.bottom = centerRectFloat.top + imageSize.height;
	        }
	        canvas.drawPixelMapHolderRect(new PixelMapHolder(image), centerRectFloat, paint);
	    }
	
	    private void drawCount(Canvas canvas, int centre, int radius) {
	        float itemSize = (CIRCLE_ANGLE - count * splitSize) / count;
	
	        RectFloat oval = new RectFloat(centre - radius, centre - radius, centre + radius, centre + radius);
	
	        paint.setColor(unFillColor);
	        for (int i = 0; i < count; i++) {
	            Arc arc = new Arc((i * (itemSize + splitSize)) - 90, itemSize, false);
	            canvas.drawArc(oval, arc, paint);
	        }
	
	        paint.setColor(fillColor);
	        for (int i = 0; i < currentCount; i++) {
	            Arc arc = new Arc((i * (itemSize + splitSize)) - 90, itemSize, false);
	            canvas.drawArc(oval, arc, paint);
	        }
	    }
	
	    @Override
	    public boolean onTouchEvent(Component component, TouchEvent touchEvent) {
	        switch (touchEvent.getAction()) {
	            case TouchEvent.PRIMARY_POINT_DOWN:
	            case TouchEvent.POINT_MOVE: {
	                this.getContentPositionX();
	                MmiPoint absPoint = touchEvent.getPointerPosition(touchEvent.getIndex());
	                Point point = new Point(absPoint.getX() - getContentPositionX(),
	                    absPoint.getY() - getContentPositionY());
	                double angle = calcRotationAngleInDegrees(centerPoint, point);
	                double multiple = angle / (CIRCLE_ANGLE / count);
	                if ((multiple - (int) multiple) > 0.4) {
	                    currentCount = (int) multiple + 1;
	                } else {
	                    currentCount = (int) multiple;
	                }
	                if (listener != null) {
	                    listener.onProgressChangeListener(currentCount);
	                }
	                invalidate();
	                break;
	            }
	        }
	        return false;
	    }
	
	    public interface ProgressChangeListener {
	        void onProgressChangeListener(int Progress);
	    }
	
	    // 计算centerPt到targetPt的夹角,单位为度。返回范围为[0, 360),顺时针旋转。
	    private double calcRotationAngleInDegrees(Point centerPt, Point targetPt) {
	        double theta = Math.atan2(targetPt.getPointY()
	            - centerPt.getPointY(), targetPt.getPointX()
	            - centerPt.getPointX());
	        theta += Math.PI / 2.0;
	        double angle = Math.toDegrees(theta);
	        if (angle < 0) {
	            angle += CIRCLE_ANGLE;
	        }
	        return angle;
	    }
	
	    public Color getUnFillColor() {
	        return unFillColor;
	    }
	
	    public CustomControlBar setUnFillColor(Color unFillColor) {
	        this.unFillColor = unFillColor;
	        return this;
	    }
	
	    public Color getFillColor() {
	        return fillColor;
	    }
	
	    public CustomControlBar setFillColor(Color fillColor) {
	        this.fillColor = fillColor;
	        return this;
	    }
	
	    public int getCircleWidth() {
	        return circleWidth;
	    }
	
	    public CustomControlBar setCircleWidth(int circleWidth) {
	        this.circleWidth = circleWidth;
	        return this;
	    }
	
	    public int getCount() {
	        return count;
	    }
	
	    public CustomControlBar setCount(int count) {
	        this.count = count;
	        return this;
	    }
	
	    public int getCurrentCount() {
	        return currentCount;
	    }
	
	    public CustomControlBar setCurrentCount(int currentCount) {
	        this.currentCount = currentCount;
	        return this;
	    }
	
	    public int getSplitSize() {
	        return splitSize;
	    }
	
	    public CustomControlBar setSplitSize(int splitSize) {
	        this.splitSize = splitSize;
	        return this;
	    }
	
	    public PixelMap getImage() {
	        return image;
	    }
	
	    public CustomControlBar setImage(PixelMap image) {
	        this.image = image;
	        return this;
	    }
	
	    public void build() {
	        invalidate();
	    }
	
	    public void setProgressChangerListener(ProgressChangeListener listener) {
	        this.listener = listener;
	    }
	}
  • 在绘制图片时使用到 Utils 工具类:
public class Utils {
	    private static final HiLogLabel TAG = new HiLogLabel(3, 0xD001100, "Utils");
	
	    private static byte[] readResource(Resource resource) {
	        final int bufferSize = 1024;
	        final int ioEnd = -1;
	        byte[] byteArray;
	        byte[] buffer = new byte[bufferSize];
	        try (ByteArrayOutputStream output = new ByteArrayOutputStream()) {
	            while (true) {
	                int readLen = resource.read(buffer, 0, bufferSize);
	                if (readLen == ioEnd) {
	                    HiLog.error(TAG, "readResource finish");
	                    byteArray = output.toByteArray();
	                    break;
	                }
	                output.write(buffer, 0, readLen);
	            }
	        } catch (IOException e) {
	            HiLog.debug(TAG, "readResource failed " + e.getLocalizedMessage());
	            return new byte[0];
	        }
	        HiLog.debug(TAG, "readResource len: " + byteArray.length);
	        return byteArray;
	    }
	
	    /**
	     * Creates a {@code PixelMap} object based on the image resource ID.
	     * <p>
	     * This method only loads local image resources. If the image file does not exist or the loading fails,
	     * {@code null} is returned.
	     *
	     * @param resourceId Indicates the image resource ID.
	     * @param slice      Indicates the Context.
	     * @return Returns the image.
	     */
	    public static Optional<PixelMap> createPixelMapByResId(int resourceId, Context slice) {
	        ResourceManager manager = slice.getResourceManager();
	        if (manager == null) {
	            return Optional.empty();
	        }
	        try (Resource resource = manager.getResource(resourceId)) {
	            if (resource == null) {
	                return Optional.empty();
	            }
	            ImageSource.SourceOptions srcOpts = new ImageSource.SourceOptions();
	            srcOpts.formatHint = "image/png";
	            ImageSource imageSource = ImageSource.create(readResource(resource), srcOpts);
	            if (imageSource == null) {
	                return Optional.empty();
	            }
	            ImageSource.DecodingOptions decodingOpts = new ImageSource.DecodingOptions();
	            decodingOpts.desiredSize = new Size(0, 0);
	            decodingOpts.desiredRegion = new Rect(0, 0, 0, 0);
	            decodingOpts.desiredPixelFormat = PixelFormat.ARGB_8888;
	
	            return Optional.of(imageSource.createPixelmap(decodingOpts));
	        } catch (NotExistException | IOException e) {
	            return Optional.empty();
	        }
	    }
	}
  • 在 onStart() 方法里将此组件添加到界面中,并可自由设置其事件响应、颜色、大小等属性:
@Override
	protected void onStart(Intent intent) {
	    super.onStart(intent);
	    DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(
	        DirectionalLayout.LayoutConfig.MATCH_PARENT, DirectionalLayout.LayoutConfig.MATCH_PARENT);
	    myLayout.setLayoutConfig(config);
	
	    // 在此创建自定义组件,并可设置其属性
	    CustomControlBar controlBar = new CustomControlBar(this);
	    controlBar.setClickable(true);
	    DirectionalLayout.LayoutConfig layoutConfig = new DirectionalLayout.LayoutConfig(
	        600, 600);
	    controlBar.setLayoutConfig(layoutConfig);
	    ShapeElement element = new ShapeElement();
	    element.setRgbColor(new RgbColor(0, 0, 0));
	    controlBar.setBackground(element);
	
	    // 将此组件添加至布局,并在界面中显示
	    myLayout.addComponent(controlBar);
	    super.setUIContent(myLayout);
	}
三、自定义布局
  • 当 Java UI 框架提供的布局无法满足设计需求时,可以创建自定义布局,根据需求自定义布局规则。
① 常用接口
  • Component 类相关接口如下表所示:
接口名作用
setEstimateSizeListener设置测量组件的侦听器
onEstimateSize测量组件的大小以确定宽度和高度
setEstimatedSize将测量的宽度和高度设置给组件
EstimateSpec.getChildSizeWithMode基于指定的大小和模式为子组件创建度量规范
EstimateSpec.getSize从提供的度量规范中提取大小
EstimateSpec.getMode获取该组件的显示模式
arrange相对于容器组件设置组件的位置和大小
  • ComponentContainer 类相关接口如下表所示:
接口名作用
setArrangeListener设置容器组件布局子组件的侦听器
onArrange通知容器组件在布局时设置子组件的位置和大小
② 如何实现自定义布局
  • 使用自定义布局,将各子组件摆放到指定的位置。自定义布局的使用效果如下所示:

  • 创建自定义布局的类,并继承 ComponentContainer,添加构造方法:
public class CustomLayout extends ComponentContainer {
	    public CustomLayout(Context context) {
	        super(context);
	    }
	}
  • 实现 ComponentContainer.EstimateSizeListener 接口,在 onEstimateSize 方法中进行测量:
public class CustomLayout extends ComponentContainer
	    implements ComponentContainer.EstimateSizeListener {
	
	    ...
	
	    public CustomLayout(Context context) {
	
	        ...
	        setEstimateSizeListener(this);
	    }
	
	    @Override
	    public boolean onEstimateSize(int widthEstimatedConfig, int heightEstimatedConfig) {
	
	        // 通知子组件进行测量
	        measureChildren(widthEstimatedConfig, heightEstimatedConfig);
	        int width = Component.EstimateSpec.getSize(widthEstimatedConfig);
	
	        // 关联子组件的索引与其布局数据
	        for (int idx = 0; idx < getChildCount(); idx++) {
	            Component childView = getComponentAt(idx);
	            addChild(childView, idx, width);
	        }
	
	        setEstimatedSize(
	            Component.EstimateSpec.getChildSizeWithMode(maxWidth, widthEstimatedConfig, 0),
	            Component.EstimateSpec.getChildSizeWithMode(maxHeight, heightEstimatedConfig, 0));
	        return true;
	    }
	
	    private void measureChildren(int widthEstimatedConfig, int heightEstimatedConfig) {
	        for (int idx = 0; idx < getChildCount(); idx++) {
	            Component childView = getComponentAt(idx);
	            if (childView != null) {
	                measureChild(childView, widthEstimatedConfig, heightEstimatedConfig);
	            }
	        }
	    }
	
	    private void measureChild(Component child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) {
	        ComponentContainer.LayoutConfig lc = child.getLayoutConfig();
	        int childWidthMeasureSpec = EstimateSpec.getChildSizeWithMode(
	            lc.width, parentWidthMeasureSpec, EstimateSpec.UNCONSTRAINT);
	        int childHeightMeasureSpec = EstimateSpec.getChildSizeWithMode(
	            lc.height, parentHeightMeasureSpec, EstimateSpec.UNCONSTRAINT);
	        child.estimateSize(childWidthMeasureSpec, childHeightMeasureSpec);
	    }
	}
  • 需要注意:
    • 容器类组件在自定义测量过程不仅要测量自身,也要递归的通知各子组件进行测量。
    • 测量出的大小需通过 setEstimatedSize 设置给组件,并且必须返回 true 使测量值生效。
  • 测量时,需要确定每个子组件大小和位置的数据,并保存这些数据:
private int xx = 0;

    private int yy = 0;

    private int maxWidth = 0;

    private int maxHeight = 0;

    private int lastHeight = 0;

    // 子组件索引与其布局数据的集合
    private final Map<Integer, Layout> axis = new HashMap<>();

    private static class Layout {
        int positionX = 0;
        int positionY = 0;
        int width = 0;
        int height = 0;
    }

    ...

    private void invalidateValues() {
        xx = 0;
        yy = 0;
        maxWidth = 0;
        maxHeight = 0;
        axis.clear();
    }

    private void addChild(Component component, int id, int layoutWidth) {
        Layout layout = new Layout();
        layout.positionX = xx + component.getMarginLeft();
        layout.positionY = yy + component.getMarginTop();
        layout.width = component.getEstimatedWidth();
        layout.height = component.getEstimatedHeight();
        if ((xx + layout.width) > layoutWidth) {
            xx = 0;
            yy += lastHeight;
            lastHeight = 0;
            layout.positionX = xx + component.getMarginLeft();
            layout.positionY = yy + component.getMarginTop();
        }
        axis.put(id, layout);
        lastHeight = Math.max(lastHeight, layout.height + component.getMarginBottom());
        xx += layout.width + component.getMarginRight();
        maxWidth = Math.max(maxWidth, layout.positionX + layout.width);
        maxHeight = Math.max(maxHeight, layout.positionY + layout.height);
    }
  • 在 onStart 方法中添加此布局,在布局中添加若干子组件,并在界面中显示:
@Override
	protected void onStart(Intent intent) {
	    super.onStart(intent);
	    DirectionalLayout.LayoutConfig config = new DirectionalLayout.LayoutConfig(
	        DirectionalLayout.LayoutConfig.MATCH_PARENT, DirectionalLayout.LayoutConfig.MATCH_PARENT);
	    myLayout.setLayoutConfig(config);
	    CustomLayout customLayout = new CustomLayout(this);
	    for (int idx = 0; idx < 15; idx++) {
	        customLayout.addComponent(getComponent(idx + 1));
	    }
	    ShapeElement shapeElement = new ShapeElement();
	    shapeElement.setRgbColor(COLOR_LAYOUT_BG);
	    customLayout.setBackground(shapeElement);
	    LayoutConfig layoutConfig = new LayoutConfig(LayoutConfig.MATCH_PARENT,
	        LayoutConfig.MATCH_CONTENT);
	    customLayout.setLayoutConfig(layoutConfig);
	    myLayout.addComponent(customLayout);
	    super.setUIContent(myLayout);
	}
	
	// 创建子组件
	private Component getComponent(int idx) {
	    Button button = new Button(getContext());
	    ShapeElement shapeElement = new ShapeElement();
	    shapeElement.setRgbColor(COLOR_BTN_BG);
	    button.setBackground(shapeElement);
	    button.setTextColor(Color.WHITE);
	    LayoutConfig layoutConfig = new LayoutConfig(300, 100);
	    if (idx == 1) { 
	        layoutConfig = new LayoutConfig(1080, 200);
	        button.setText("1080 * 200");
	    } else if (idx == 6) { 
	        layoutConfig = new LayoutConfig(500, 100);
	        button.setText("500 * 100");
	    } else if (idx == 8) { 
	        layoutConfig = new LayoutConfig(600, 600);
	        button.setText("600 * 600");
	    } else {
	        button.setText("Item" + idx);
	    }
	    layoutConfig.setMargins(10, 10, 10, 10);
	    button.setLayoutConfig(layoutConfig);
	    return button;
	}
四、完整示例

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