我有以下kotlin代码来发送带附件的电子邮件:
val file = File(directory, filename)
file.createNewFile()
file.writeText("My Text", Charsets.UTF_8)
// ---- file is written succesfully, now let us
// try to get the URI and pass it for the intent
val fileURI = FileProvider.getUriForFile(this, "com.mydomain.myapp", file!!)
val emailIntent = Intent(Intent.ACTION_SEND).apply {
putExtra(Intent.EXTRA_SUBJECT, "My subject"))
putExtra(Intent.EXTRA_TEXT, "My message")
putExtra(Intent.EXTRA_STREAM, fileURI)
}
emailIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
emailIntent.type = "text/plain"
startActivity(emailIntent)
现在,当我运行上面的代码时,我收到一个错误:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
用于fileURI分配行。如果我使用:
而不是FileProviderputExtra(Intent.EXTRA_STREAM, file!!.toURI())
作为额外的intent参数,然后我收到一个错误:
W/Bundle: Key android.intent.extra.STREAM expected Parcelable but value was a java.net.URI. The default value <null> was returned.
03-22 11:39:06.625 9620-9620 / com.secretsapp.secretsapp W / Bundle:尝试转换生成的内部异常:
W/Bundle: Key android.intent.extra.STREAM expected Parcelable but value was a java.net.URI. The default value <null> was returned.
W/Bundle: Attempt to cast generated internal exception:
java.lang.ClassCastException: java.net.URI cannot be cast to android.os.Parcelable
at android.os.Bundle.getParcelable(Bundle.java:945)
该文件是在全局Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS)
目录下的子目录下创建的,该应用程序也具有Manifest.permission.WRITE_EXTERNAL_STORAGE
权限。有关如何获取文件的URI并将其附加到电子邮件意图的任何指示?
答案 0 :(得分:1)
对于您的第一次尝试 - 这是正确的方法 - 您的<provider>
没有权限值com.mydomain.myapp
。清单中<provider>
元素中的权限字符串必须与传递给getUriForFile()
的第二个参数匹配。这包含在the documentation for FileProvider
。
对于第二次尝试,toURI()
会返回URI
,而不是Uri
。虽然您可以将其切换为Uri.fromFile()
,但一旦targetSdkVersion
攀升至24或更高,您就会在Android 7.0+上崩溃。使用FileProvider
方法。
答案 1 :(得分:0)
使用以下代码在Kotlin中发送电子邮件:
UILabel
答案 2 :(得分:0)
清单:
<application>
...
<provider
android:name="android.support.v4.content.FileProvider" <- or use your provider implementation
android:authorities="com.your.package.fileprovider" <- must end with .fileprovider
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>
...
</application
res / xml / provider_paths.xml
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path path="Android/data/" name="files_root" />
<external-path path="." name="external_storage_root" />
</paths>
使用Sankar'实现,但是要获取文件uri,权限必须等于清单中声明的权限:
val fileURI = FileProvider.getUriForFile(context, "$packageName.fileprovider", yourFile)