native.js分享文件报错

var main = plus.android.runtimeMainActivity();
var Intent = plus.android.importClass("android.content.Intent");
var Uri = plus.android.importClass("android.net.Uri");
var File = plus.android.importClass("java.io.File");
var shareIntent = new Intent(Intent.ACTION_SEND);
var filePath=plus.io.convertLocalFileSystemURL("_doc/s/a.jpg"); //把应用内的文件路径转化为手机绝对路径
shareIntent.putExtra(Intent.EXTRA_STREAM,Uri.fromFile(new File(filePath)));
shareIntent.setType("/");//此处可发送多种文件
main.startActivity(Intent.createChooser(shareIntent,"分享文件"));

运行后报如下错误：Uncaught android.os.FileUriExposedException: file:///storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/doc/s/a.jpg exposed beyond app through ClipData.Item.getUri();at io.dcloud.PandoraEntryActivity.startActivity at index.html:1
请问如何解决？