Открыть файл из своего приложения - приложением по умолчанию под андроид 7

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    ...
    <application
        ...
        <provider
            android:name=".GenericFileProvider"
            android:authorities="${applicationId}.my.package.name.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>
    </application>
</manifest>

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

  <provider android:name="android.support.v4.content.FileProvider" android:authorities="<к примеру имя пакета>.fileprovider" android:exported="false" android:grantUriPermissions="true">

            <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths"/>
        </provider>

E AndroidRuntime: FATAL EXCEPTION: main
E AndroidRuntime: Process: org.adm.esd, PID: 8470
E AndroidRuntime: java.lang.RuntimeException: Unable to get provider android.support.v4.content.FileProvider: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.FileProvider" on path: DexPathList[[zip file "/data/app/org.adm.esd-2/base.apk"],nativeLibraryDirectories=[/data/app/org.adm.esd-2/lib/arm, /data/app/org.adm.esd-2/base.apk!/lib/armeabi-v7a, /system/lib, /vendor/lib]]

compile 'com.android.support:appcompat-v7:27.1.0'

> Could not find method compile() for arguments [com.android.support:support-core-utils:27.1.0] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

Вариант с

.GenericFileProvider

E AndroidRuntime: Process: org.adm.esd, PID: 11116

E AndroidRuntime: java.lang.RuntimeException: Unable to get provider org.adm.esd.GenericFileProvider: java.lang.ClassNotFoundException: Didn't find class "org.adm.esd.GenericFileProvider" on path: DexPathList[[zip file "/data/app/org.adm.esd-2/base.apk"],nativeLibraryDirectories=[/data/app/org.adm.esd-2/lib/arm, /data/app/org.adm.esd-2/base.apk!/lib/armeabi-v7a, /system/lib, /vendor/lib]]

requires com.google.android.gm.permission.READ_GMAIL

<user-permission android :name="com.google.android.gm.permission.WRITE_GMAIL">
<user-permission android :name="com.google.android.gm.permission.AUTO_SEND">

<provider android:name="android.support.v4.content.FileProvider" android:authorities="com.example.fileprovider" android:exported="false" android:grantUriPermissions="true">

            <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths"/>
        </provider>

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-files-path name="my_folder" path="folder"/>
</paths>

QString c_pathFolder = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation);
c_pathFolder += "/Android/data/com.example/files/folder/"
QDir t_dir;
t_dir.mkpath(c_pathFolder);
c_pathFolder += "text.txt";
QFile t_file(c_pathFolder);
t_file.open.....

compile "com.android.support:support-core-utils:27.1.0"

1. Defining a FileProvider
2. Specifying Available Files
3. Retrieving the Content URI for a File
4. Granting Temporary Permissions to a URI
5. Serving a Content URI to Another App

1. Defining a FileProvider
2. Specifying Available Files
3. Retrieving the Content URI for a File
4. Granting Temporary Permissions to a URI
5. Serving a Content URI to Another App