鸿蒙入门指南,小白速来!0基础学习路线分享,高效学习方法,重点答疑解惑--->【课程入口】
目录:
1. SwipeLayout组件功能介绍
2. SwipeLayout使用方法
3. SwipeLayout开发实现
4.《HarmonyOS三方件开发指南》系列文章合集
1. SwipeLayout组件功能介绍
1.1.功能介绍:
SwipeLayout组件是一个侧滑删除组件。
1.2. 模拟器上运行效果:

2. SwipeLayout使用方法
2.1. 新建工程,增加组件Har包依赖
在应用模块中添加HAR,只需要将SwipeLayout.har复制到entry\libs目录下即可(由于build.gradle中已经依赖的libs目录下的*.har,因此不需要再做修改)。
2.2. 修改主页面的布局文件
修改主页面的布局文件ability_main.xml,将自定义的SwipeLayout添加到xml中,将初始状态下展示的视图添加到SwipeLayout作为index为0的子视图:
1<?xml version="1.0" encoding="utf-8"?> 2<DirectionalLayout 3 xmlns:ohos="http://schemas.huawei.com/res/ohos" 4 ohos:id="$+id:total1" 5 ohos:height="match_parent" 6 ohos:width="match_parent" 7 ohos:background_element="gray" 8 ohos:orientation="vertical"> 9 <com.isoftstone.swipelayout.SwipeLayout 10 ohos:id="$+id:sample2" 11 ohos:height="80vp" 12 ohos:width="match_parent" 13 ohos:orientation="horizontal"> 14 <Text 15 ohos:id="$+id:bottom_layout1" 16 ohos:height="match_parent" 17 ohos:width="match_parent" 18 ohos:background_element="white" 19 ohos:multiple_lines="true" 20 ohos:padding="10" 21 ohos:text="要有最樸素的生活和最遙遠的夢想,即使明天天寒地凍,山高水遠,路遠馬亡。" 22 ohos:text_alignment="left" 23 ohos:text_size="14fp" 24 ohos:visibility="visible"> 25 </Text> 26 <DirectionalLayout 27 ohos:id="$+id:bottom_wrapper1" 28 ohos:height="match_parent" 29 ohos:width="360px" 30 ohos:background_element="#ddff00" 31 ohos:orientation="horizontal" 32 ohos:visibility="visible"> 33 <Text 34 ohos:id="$+id:Texts1" 35 ohos:height="match_parent" 36 ohos:width="180px" 37 ohos:background_element="#7B1FA2" 38 ohos:left_padding="25" 39 ohos:right_padding="25" 40 ohos:text="收藏" 41 ohos:text_alignment="center" 42 ohos:text_color="#DC143C" 43 ohos:text_size="14fp" 44 ohos:visibility="visible" 45 /> 46 <Text 47 ohos:id="$+id:texts2" 48 ohos:height="match_parent" 49 ohos:width="180px" 50 ohos:background_element="#C7C7CC" 51 ohos:left_padding="25" 52 ohos:right_padding="25" 53 ohos:text="删除" 54 ohos:text_alignment="center" 55 ohos:text_color="#DC143C" 56 ohos:text_size="14fp" 57 ohos:visibility="visible" 58 /> 59 </DirectionalLayout> 60 <Image 61 ohos:id="$+id:images3" 62 ohos:height="match_parent" 63 ohos:width="match_parent" 64 ohos:background_element="gray" 65 ohos:image_src="$media:star" 66 /> 67 <DirectionalLayout 68 ohos:id="$+id:bottom_fronts" 69 ohos:height="match_parent" 70 ohos:width="match_content" 71 ohos:background_element="#ddff00" 72 ohos:orientation="horizontal" 73 ohos:visibility="visible"> 74 <Image 75 ohos:id="$+id:images1" 76 ohos:height="match_parent" 77 ohos:width="180px" 78 ohos:background_element="green" 79 ohos:image_src="$media:star"/> 80 <Image 81 ohos:id="$+id:images2" 82 ohos:height="match_parent" 83 ohos:width="180px" 84 ohos:background_element="red" 85 ohos:image_src="$media:trash"/> 86 </DirectionalLayout> 87 </com.isoftstone.swipelayout.SwipeLayout> 88 <Image 89 ohos:id="$+id:images" 90 ohos:height="match_content" 91 ohos:width="match_content" 92 ohos:background_element="green" 93 ohos:image_src="$media:star" 94 ohos:layout_alignment="horizontal_center" 95 ohos:top_margin="100vp"/> 96</DirectionalLayout>
2.3. 初始化SwipeLayout
在MainAbilitySlince类的onStart函数中,增加如下代码。
1SwipeLayout swipeLayout = (SwipeLayout) findComponentById(ResourceTable.Id_sample1); 2DirectionalLayout right = (DirectionalLayout) findComponentById(ResourceTable.Id_bottom_wrapper); 3//初始化 4swipeLayout.initializeSwipe(); 5DirectionalLayout left = (DirectionalLayout) findComponentById(ResourceTable.Id_bottom_front); 6Image image3 = (Image) findComponentById(ResourceTable.Id_image3); 7//将各个方向拖拽时对应展示的视图添加到swipeLayout 8swipeLayout.addDrag(SwipeLayout.DragEdge.Left, right); 9swipeLayout.addDrag(SwipeLayout.DragEdge.Right, left); 10swipeLayout.addDrag(SwipeLayout.DragEdge.Bottom, image3);
3. SwipeLayout开发实现
3.1. 新建一个Module
新建一个Module,类型选择HarmonyOS Library,模块名为SwipeLayout,如图

3.2. 新建一个SwipeLayout类
新建一个SwipeLayout类,继承自PositionLayout类
SwipeLayout的主要流程:
1. 首先通过xml的构造方法,为SwipeLayout添加拖拽监听;
2. 将LinkedHashMap<DragEdge, Component> mDragEdges初始化为空,并确定主界面的显示位置;
3. 通过public void addDrag(DragEdge dragEdge, Component child) 方法将可拖拽的方向和对应展示的视图添加到mDragEdges,并设置其初始的ContentPosition;
1public void addDrag(DragEdge dragEdge, Component child) { 2 mDragEdges.put(dragEdge, child); 3 switch (dragEdge) { 4 case Left: 5 child.setContentPosition(getWidth(), 0); 6 break; 7 case Right: 8 HiLog.info(label, "Log_addDrag" + child.getHeight()); 9 child.setContentPosition(-child.getWidth(), 0); 10 break; 11 case Top: 12 child.setContentPosition(0, getHeight()); 13 break; 14 case Bottom: 15 child.setContentPosition(0, -child.getHeight()); 16 break; 17 } 18 child.setVisibility(INVISIBLE); 19 addComponent(child, 0); 20}
4.在拖拽动作的监听回调方法中完成对视图的更新
A.在update回调中设置打开和关闭的边界以及边界内的位置刷新
1if (getSurfaceView().getContentPositionY() + dragInfo.yOffset <= 0) { 2 close(); 3} else if (getSurfaceView().getContentPositionY() + dragInfo.yOffset >= getHeight()) { 4 open(); 5} else { 6 getSurfaceView().setContentPositionY(getSurfaceView().getContentPositionY() + (float) dragInfo.yOffset); 7 getCurrentBottomView().setContentPositionY(getCurrentBottomView().getContentPositionY() + (float) dragInfo.yOffset); 8}
B.在end中判断滑动的距离,如果大于设定的滑动距离则直接将控件展开或者关闭
1if (isCloseBeforeDrag && mDragDistanceY < 0) { 2 if (Math.abs(mDragDistanceY) >= mWillOpenPercentAfterClose * getBottomViewHeight()) { 3 open(); 4 } else { 5 close(); 6 } 7} 8if (!isCloseBeforeDrag && mDragDistanceY > 0) { 9 if (Math.abs(mDragDistanceY) >= mWillOpenPercentAfterClose * getBottomViewHeight()) { 10 close(); 11 } else { 12 open(); 13 } 14}
3.3. 编译HAR包
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loadingview> bulid > outputs > har目录中,获取生成的HAR包。
项目源代码地址:https://github.com/isoftstone-dev/SwipeBackLayout
作者:软通田可辉
想了解更多内容,请访问: 51CTO和华为官方战略合作共建的鸿蒙技术社区https://harmonyos.51cto.com