十年网站开发经验 + 多家企业客户 + 靠谱的建站团队
量身定制 + 运营维护+专业推广+无忧售后,网站问题一站解决
想了解更多内容,请访问:

创新互联长期为上千客户提供的网站建设服务,团队从业经验10年,关注不同地域、不同群体,并针对不同对象提供差异化的产品和服务;打造开放共赢平台,与合作伙伴共同营造健康的互联网生态环境。为龙胜企业提供专业的网站设计、做网站,龙胜网站改版等技术服务。拥有10年丰富建站经验和众多成功案例,为您定制开发。
和华为官方合作共建的鸿蒙技术社区
https://harmonyos.
现在很多的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。在消息通讯类的app中十分实用。
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,并且每个徽章都具有拖拽超范围即可消除,范围内即可回到原位置。模拟机效果图如下
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,作为一个har包导入到自己的项目中即可。下面则详细介绍BGABadgeView 的使用以及开发指南。
Ø 新建工程, 添加组件Har包依赖
在应用模块中添加HAR,只需要将verificationcodeview-debug.har复制到entry\libs目录下即可
Ø 修改配置文件
1. 修改主页面的布局文件:
- xmlns:ohos="http://schemas.huawei.com/res/ohos"
 - ohos:height="match_parent"
 - ohos:width="match_parent"
 - ohos:id="$+id:layout1"
 - ohos:orientation="vertical">
 - ohos:id="$+id:dependent1"
 - ohos:height="200vp"
 - ohos:width="match_parent">
 - 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="$id:title"
 - ohos:left_margin="30vp"/>
 - ohos:top_margin="15vp"
 - ohos:right_margin="10vp"
 - ohos:bottom_margin="10vp"
 - ohos:height="80vp"
 - ohos:width="80vp"
 - ohos:scale_mode="zoom_center"
 - ohos:image_src="$media:avator"
 - ohos:id="$+id:image2"
 - ohos:end_of="$id:image1"
 - ohos:below="$id:title"
 - ohos:left_margin="10vp"/>
 - ohos:left_margin="30vp"
 - ohos:id="$+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"/>
 
2.修改MainAbilitySlice中的UI加载代码
在MainAbilitySlince类的onStart函数中,增加如下代码:
- @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
 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;
 - }
 - });
 - }
 
复制通过以上两个步骤,就实现了简单的徽章组件,接下来在一起看下徽章组件是如何实现的。
新建一个Module,类型选择HarmonyOS Library,模块名为VerificationCodeView,如图:
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。
利用Gradle可以将HarmonyOS Library库模块构建为HAR包,构建HAR包的方法如下:
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,可以在工程目录中的VerificationCodeView> bulid > outputs > har目录中,获取生成的HAR包。
想了解更多内容,请访问:
和华为官方合作共建的鸿蒙技术社区
https://harmonyos.