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长按图片保存到相册是一个常用的功能，目前华为快应用还没有现成的接口可以实现，但可以通过通用事件longpress来实现。 实现方法 使用image组件渲染图片，然后在image组件上实现longpress事件，从而触发将图片保存到手机相机的功能。 详细示例代码如下： <template>
<div class="doc-page">
<div class="page-title-wrap">
<text class="page-title">{{componentName}}</text>
</div>
<div class="item-container">
<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:"Touch and hold the following picture to save to the album:",
inputImageURL: 'https: //tse1-mm.cn.bing.net/th/id/OIP.QFyNrABM6FhaY_0TCuUZqgHaFj?pid=Api&rs=1'
},
onInit(){
this.$page.setTitleBar({text: 'Demo'});
},
onImageLongpress(){
var that=this;
prompt.showDialog({
message: 'Touch and hold to save the picture?',
buttons: [{
text: 'OK',
color: '#33dd44'
},
{
text: 'Cancel',
color: '#33dd44'
}],
success: function(data){
console.log("handling callback",data);
if(data.index===0)
{
that.$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>
更多案例可参考https://developer.huawei.com/consumer/cn/doc/development/quickApp-Guides/quickapp-case-0000001082020374#section1198213111817 | 
