HarmonyOS三方件开发指南(19)-BGABadgeView徽章组件

目录：java

引言布局

如今不少的APP会有新消息/未接来电/未读消息/新通知圆球红点提示，典型的以微信、QQ新消息提示为例，当微信朋友圈有新的朋友更新/发布朋友圈消息后，在微信的底部切换卡上会有一个红色的小圆球红点，表示有新消息，提示用户查看。在消息通信类的app中十分实用。post

功能介绍测试

鸿蒙BGABadgeView 徽章组件，主要功能包括：传入图片生成徽章，设置文本生成文本徽章，而且每一个徽章都具备拖拽超范围便可消除，范围内便可回到原位置。模拟机效果图以下this

1.图片徽章：

2.文字徽章:

3.拖动徽章爆炸:

使用时候，直接将其下载，做为一个har包导入到本身的项目中便可。下面则详细介绍BGABadgeView 的使用以及开发指南。

BGABadgeView 使用指南

Ø 新建工程，添加组件Har包依赖

在应用模块中添加HAR，只须要将verificationcodeview-debug.har复制到entry\libs目录下便可

Ø 修改配置文件

1. 修改主页面的布局文件：

<?xml version="1.0" encoding="utf-8"?> <DependentLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:height="match_parent" ohos:width="match_parent" ohos:id="$+id:layout1" ohos:orientation="vertical"> <DependentLayout ohos:id="$+id:dependent1" ohos:height="200vp" ohos:width="match_parent"> <com.example.bgabadgecomp_library.BAGDragBadgeImage ohos:top_margin="15vp" ohos:right_margin="10vp" ohos:bottom_margin="10vp" ohos:height="80vp" ohos:width="80vp" ohos:scale_mode="zoom_center" ohos:image_src="$media:avator" ohos:id="$+id:image1" ohos:below="$id:title" ohos:left_margin="30vp"/> <Image ohos:top_margin="15vp" ohos:right_margin="10vp" ohos:bottom_margin="10vp" ohos:height="80vp" ohos:width="80vp" ohos:scale_mode="zoom_center" ohos:image_src="$media:avator" ohos:id="$+id:image2" ohos:end_of="$id:image1" ohos:below="$id:title" ohos:left_margin="10vp"/> </DependentLayout> <Text ohos:left_margin="30vp" ohos:id="$+id:text1" ohos:top_margin="10vp" ohos:right_margin="15vp" ohos:bottom_margin="10vp" ohos:height="40vp" ohos:width="match_parent" ohos:text="测试1" ohos:below="$id:dependent1" ohos:text_size="20vp"/> </DependentLayout>

2.修改MainAbilitySlice中的UI加载代码

在MainAbilitySlince类的onStart函数中，增长以下代码：

@Override
public void onStart(Intent intent) {
    super.onStart(intent);
    super.setUIContent(ResourceTable.Layout_ability_main);

    BAGDragBadgeImage bagDragBadgeImage = (BAGDragBadgeImage) findComponentById(ResourceTable.Id_image1);
    bagDragBadgeImage.setCornerRadius(bagDragBadgeImage.getWidth() / 2); // 圆形边框
    DependentLayout stackLayout = (DependentLayout) findComponentById(ResourceTable.Id_layout1);

    Image image2 = (Image) findComponentById(ResourceTable.Id_image2);
    image2.setCornerRadius(20);

    DependentLayout.LayoutConfig config = new DependentLayout.LayoutConfig(DependentLayout.LayoutConfig.MATCH_PARENT, DependentLayout.LayoutConfig.MATCH_PARENT);

    RoundRectImage roundRectImage = RoundRectImage.attach2Window(this, stackLayout, image2, config, BGABadgeViewHelper.getPixelMap(this, ResourceTable.Media_avatar_vip));

    RoundRectText roundRectText = RoundRectText.attach2Window(this, stackLayout, image3, config);

    Text text1  = (Text) findComponentById(ResourceTable.Id_text1);
    RoundRectText roundText1 = RoundRectText.attach2Window(this, stackLayout, text1, config);
    roundText1.setBadgeText("qqqqqqqq");
    List<Component> componentList = new ArrayList<>(); componentList.add(roundRectText); componentList.add(roundText1); stackLayout.setTouchEventListener(new Component.TouchEventListener() { @Override public boolean onTouchEvent(Component component, TouchEvent event) { switch (event.getAction()) { case TouchEvent.PRIMARY_POINT_DOWN:// 手指第一次触摸到屏幕 int startX = (int) event.getPointerPosition(event.getIndex()).getX(); int startY = (int) event.getPointerPosition(event.getIndex()).getY(); if (startX < roundRectImage.getCircleLeft() + 2 * roundRectImage.getCircleRadius() && startX > roundRectImage.getCircleLeft() && startY < roundRectImage.getCircleTop() + 2 * roundRectImage.getCircleRadius() && startY > roundRectImage.getCircleTop()) { roundRectImage.setDraggedListener(DRAG_HORIZONTAL_VERTICAL, roundRectImage ); for (Component component1 : componentList) { component1.setDraggedListener(DRAG_HORIZONTAL_VERTICAL,null); } } else { roundRectImage.setDraggedListener(DRAG_HORIZONTAL_VERTICAL, null ); for (Component component1 : componentList) { RoundRectText rectText = (RoundRectText) component1; if (startX < rectText.getCircleLeft() + 2 * rectText.getRadius() && startX > rectText.getCircleLeft() && startY < rectText.getCircleTop() + 2 * rectText.getRadius() && startY > rectText.getCircleTop()) { component1.setDraggedListener(DRAG_HORIZONTAL_VERTICAL, (Component.DraggedListener) component1); } else { component1.setDraggedListener(DRAG_HORIZONTAL_VERTICAL,null); } } } break; case TouchEvent.PRIMARY_POINT_UP: case TouchEvent.POINT_MOVE: default: break; } return true; } }); }

经过以上两个步骤，就实现了简单的徽章组件，接下来在一块儿看下徽章组件是如何实现的。

BGABadgeView 开发指南

新建一个Module

新建一个Module，类型选择HarmonyOS Library，模块名为VerificationCodeView，如图:

新建一个RoundRectText类

1.实现自定义RoundRectText绘制

@Override public void onDraw(Component component, Canvas canvas){ length = mBadgeText.length(); Paint mTextPain = new Paint(); mTextPain.setColor(Color.WHITE); mTextPain.setStyle(Paint.Style.FILL_STYLE); mTextPain.setTextSize(30); mTextPain.setFont(Font.DEFAULT); Rect textBounds = mTextPain.getTextBounds(mBadgeText); Paint mBadgePaint = new Paint(); mBadgePaint.setColor(Color.RED); mBadgePaint.setStyle(Paint.Style.FILL_STYLE); mBadgePaint.setStrokeWidth(5); if (mBadgeRectF == null) { switch (mBadgeGravity) { case RightTop: int left = mComponent.getLeft(); int top = mComponent.getTop(); circleLeft = mComponent.getWidth() + left - 2 * radius - 15 * (length - 2); circleTop = top; mBadgeRectF = new RectFloat( circleLeft, circleTop, circleLeft + 2 * radius + 15 * (length - 2) , circleTop + 2 * radius); break; case RightCenter: left = mComponent.getLeft(); top = mComponent.getTop(); circleLeft = mComponent.getWidth() + left - 2 * radius - 15 * (length - 2); circleTop = top + (float)mComponent.getHeight() / 2 - radius; mBadgeRectF = new RectFloat( circleLeft, circleTop, circleLeft + 2 * radius + 15 * (length - 2) , circleTop + 2 * radius); break; case RightBottom: mBadgeRectF = new RectFloat(); left = mComponent.getLeft(); top = mComponent.getTop(); circleLeft = mComponent.getWidth() + left - 2 * radius - 15 * (length - 2) ; circleTop = top + mComponent.getHeight() - 2 * radius; mBadgeRectF = new RectFloat( circleLeft, circleTop, circleLeft + 2 * radius + 15 * (length - 2) , circleTop + 2 * radius); break; default: break; } } path = (float) Math.sqrt((mBadgeRectF.left - circleLeft) * (mBadgeRectF.left - circleLeft) + (mBadgeRectF.top - circleTop) * (mBadgeRectF.top - circleTop)); isOverPath = path > overPath; float offSet = (float) (textBounds.top + textBounds.bottom) / 2; float boundsX = 0 ; if( 15 * length < (mBadgeRectF.right - mBadgeRectF.left)){ float temp = mBadgeRectF.right - mBadgeRectF.left - 15 * length; boundsX = temp / 2; } float roundNum = 2 * radius / (mBadgeRectF.right - mBadgeRectF.left) ; canvas.drawRoundRect(mBadgeRectF,roundNum * radius ,roundNum * radius, mBadgePaint); canvas.drawText(mTextPain, mBadgeText, mBadgeRectF.left + boundsX, mBadgeRectF.top + radius - offSet); }

2.生成拖拽事件

@Override public void onDragDown(Component component, DragInfo dragInfo) { pointX = dragInfo.downPoint.getPointX(); pointY = dragInfo.downPoint.getPointY(); if (pointX <= circleLeft || pointX >= circleLeft + 2 * radius + 15 * (length - 2) || pointY <= circleTop || pointY >= circleTop + 2 * radius) { onDragCancel(component, dragInfo); } } @Override public void onDragStart(Component component, DragInfo dragInfo) { } @Override public void onDragUpdate(Component component, DragInfo dragInfo) { float left = mBadgeRectF.left; float right = mBadgeRectF.right; float top = mBadgeRectF.top; float bottom = mBadgeRectF.bottom; if (pointX <= circleLeft || pointX >= circleLeft + 2 * radius + 15 * (length - 2) || pointY <= circleTop || pointY >= circleTop + 2 * radius) { onDragCancel(component, dragInfo); } else { mBadgeRectF.left = (float) (left + dragInfo.xOffset); mBadgeRectF.right = (float) (right + dragInfo.xOffset); mBadgeRectF.top = (float) (top + dragInfo.yOffset); mBadgeRectF.bottom = (float) (bottom + dragInfo.yOffset); invalidate(); } } @Override public void onDragEnd(Component component, DragInfo dragInfo) { if (isOverPath) { explosionField.explode(component, mBadgeRectF, explosionFieldColor); } else { mBadgeRectF = new RectFloat(circleLeft, circleTop , circleLeft + 2 * radius + 15 * (length - 2), circleTop + 2 * radius); invalidate(); } } @Override public void onDragCancel(Component component, DragInfo dragInfo) { mBadgeRectF = new RectFloat(circleLeft, circleTop , circleLeft + 2 * radius + 15 * (length - 2), circleTop + 2 * radius); invalidate(); }

具体代码请下载项目查看。

编译HAR包

利用Gradle能够将HarmonyOS Library库模块构建为HAR包，构建HAR包的方法以下：

在Gradle构建任务中，双击PackageDebugHar或PackageReleaseHar任务，构建Debug类型或Release类型的HAR。

待构建任务完成后，能够在工程目录中的VerificationCodeView> bulid > outputs > har目录中，获取生成的HAR包。

更多原创，请关注：软通动力HarmonyOS学院https://harmonyos.51cto.com/column/30

做者：软通田可辉

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