android - 使用 fileprovider 加载文本文件时出现 ERR_UNKNOWN_URL_SCHEME

Question

ma​​nifest.xml 中的提供者

<!-- File Provider -->
    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.example.test.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
    </provider>

资源文件

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>

文件提供者的使用

Uri uri = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".fileprovider", file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "*/*");
intent.startActivity(intent);

引用:here

描述: 我无法使用此文件提供程序打开图像、文本文件和 pdf。 当我打开文件文本文件时，它会给我 ERR_UNKNOWN_URL_SCHEME。 如果我打开图像或 pdf，它什么也没有显示

Answer 1

您需要将“FLAG_GRANT_READ_URI_PERMISSION”标志添加到您的 Intent 中:

Uri uri = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".fileprovider", file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(uri, "*/*");
intent.addFlags(FLAG_GRANT_READ_URI_PERMISSION);
intent.startActivity(intent);

https://developer.android.com/reference/android/content/Intent.html#FLAG_GRANT_READ_URI_PERMISSION

FLAG_GRANT_READ_URI_PERMISSION If set, the recipient of this Intent will be granted permission to perform read operations on the URI in the Intent's data and any URIs specified in its ClipData. When applying to an Intent's ClipData, all URIs as well as recursive traversals through data or other ClipData in Intent items will be granted; only the grant flags of the top-level Intent are used.