AndroidManifest.xml在</application>标签上加入

<provider

            android:name="androidx.core.content.FileProvider"

            android:authorities="com.example.myapplication.fileprovider"

            android:exported="false"

            android:grantUriPermissions="true">

            <meta-data

                android:name="android.support.FILE_PROVIDER_PATHS"

                android:resource="@xml/filepath" />

        </provider>

在app\src\main\res\xml中加入文件filepath.xml

<?xml version="1.0" encoding="utf-8"?>

<paths xmlns:android="http://schemas.android.com/apk/res/android">

    <root-path name="root" path="." />

    <files-path name="files" path="." />

    <external-path name="external" path="." />

    <external-cache-path name="external_cache" path="." />

    <external-files-path name="external_file" path="." />

</paths>