场景描述
微信小程序中，存在一个很方便的功能，即长按图片可以保存到手机相册，目前华为快应用没有直接的接口可以实现，如下介绍如何通过事件触发来实现该功能。
实现思路
快应用组件均支持通用事件longpress（长按），于是考虑用image组件渲染图片，然后在image组件上实现longpress事件，触发图片保存到手机相册的功能。
解决方法
代码如下：
<template>
<div class="doc-page">
<div class="page-title-wrap">
<text class="page-title">{{componentName}}</text>
</div>
<div class="item-container">
<text class="item-title">Remote
image:https://tse1-mm.cn.bing.net/th/id/OIP.QFyNrABM6FhaY_0TCuUZqgHaFj?pid=Api&rs=1</text>
<div class="item-content">
<image src="https://tse1-mm.cn.bing.net/th/id/OIP.QFyNrABM6FhaY_0TCuUZqgHaFj?pid=Api&rs=1" id="image" style="object-fit:cover" onlongpress="onImageLongpress"></image>
</div>
</div>
</div>
</template>
<style>
.doc-page {
flex: 1;
flex-direction: column;
}
.item-container {
margin-top: 40px;
margin-bottom: 40px;
flex-direction: column;
}
.item-title {
padding-left: 30px;
padding-bottom: 20px;
color: #aaaaaa;
}
.item-content {
height: 200px;
justify-content: center;
}
#image {
width: 240px;
height: 160px;
object-fit: contain;
}
</style>
<script>
import prompt from\'@system.prompt\'
import media from \'@system.media\'
export default{
private: {
componentName:"长按如下图片保存",
inputImageURL: \'https: //tse1-mm.cn.bing.net/th/id/OIP.QFyNrABM6FhaY_0TCuUZqgHaFj?pid=Api&rs=1\'
},
onInit(){
this.$page.setTitleBar({text: \'长按图片保存示例\'});
},
onImageLongpress(){
var that=this;
prompt.showDialog({
message: \'长按是否保存图片\',
buttons: [{
text: \'确定\',
color: \'#33dd44\'
},
{
text: \'取消\',
color: \'#33dd44\'
}],
success: function(data){
console.log("handling callback",data);
if(data.index===0)
{
that.$element("image").toTempFilePath({
fileType: \'jpg\',
quality: 1.0,
success: function (ret) {
console.log(\'toTempFilePath success:tempFilePath=\' + ret.tempFilePath)
media.saveToPhotosAlbum ({
uri: ret.tempFilePath,
success:function(data)
{
console.log("save picture success");
},
fail: function(data, code) {
console.log("handling fail, code=" + code);
}
})
},
fail: function (msg, code) {
console.log(\'toTempFilePath failed:code=\' + code + \'; msg=\' + msg);
}, complete: function (ret) {
console.log(\'toTempFilePath complete\');
}
})
}
},
cancel: function(){
console.log("cancel");
}
})
}
}
</script>
更多参考
快应用API文档参考：
原文链接：https://developer.huawei.com/...
原作者：Mayism