as written below I was able to get Content URIs from FileDialog using a
small test app:
content://com.android.externalstorage.documents/document/primary%3ADocuments%2Fekke.txt
now I wanted to implement this in my customer app. unfortunately now the
Content URIs from FileDialog look different:
content://com.android.providers.media.documents/document/document%3A1000000020
this URI also gives me access to the file content, but I'm missing the
name and suffix
any idea what could cause this different behavior ?
same environment, same QML FileDialog from QtQuick.Dialogs1.3 inside a
QQC2 app
only difference: customer app is using user 10 (Business app)
thx
ekke
Am 23.11.22 um 10:02 schrieb ekke:
In one of my apps the user must be able to select one or more files
from shared data and also to create a new file in a selected directory.
Up to API 29 I did this using QStandardPathes, per ex. for
PicturesLocation and DocumentsLocation and have built my own
CustomFileDialog.
With API30 QStandardPathes only work with AppDataLocation, but not
with external shared data because of ScopedStorage.
Qt support for ScopedStorage is still work-in-progress
(https://bugreports.qt.io/browse/QTBUG-98974
<https://bugreports.qt.io/browse/QTBUG-98974>)
Tried to use MANAGE_EXTERNAL_STORAGE, because the app is a
DropBox-like app to manage files from shared network drives or
SharePoints.
cpp:
#define PACKAGE_NAME "package:org.company.package_name"
jboolean value =
QAndroidJniObject::callStaticMethod<jboolean>("android/os/Environment",
"isExternalStorageManager");
if( value == false )
{
QAndroidJniObject ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION =
QAndroidJniObject::getStaticObjectField( "android/provider/Settings",
"ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION","Ljava/lang/String;" );
QAndroidJniObject intent("android/content/Intent",
"(Ljava/lang/String;)V",
ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION.object());
QAndroidJniObject jniPath = QAndroidJniObject::fromString(PACKAGE_NAME);
QAdroidJniObject jniUri =
QAndroidJniObject::callStaticObjectMethod("android/net/Uri", "parse",
"(Ljava/lang/String;)Landroid/net/Uri;", jniPath.object<jstring>());
QAndroidJniObject jniResult = intent.callObjectMethod("setData",
"(Landroid/net/Uri;)Landroid/content/Intent;", jniUri.object<jobject>() );
QtAndroid::startActivity(intent, 0);
}
Manifest:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission
android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
App asks for permission and sets permission – controlled at
settings-apps-special apps-apps with all files access.
But nothing changed – QStandardPathes still gives no access to files –
only for internal AppDataLocation.
Any idea what could be missed to get the “old” behaviour back using
MANAGE_EXTERNAL_STORAGE permission ?
Looked for workarounds and tried KDAB SharedStorage Library:
https://www.kdab.com/android-shared-storage-qt-wrapper/
<https://www.kdab.com/android-shared-storage-qt-wrapper/>
https://github.com/KDAB/android/tree/master/shared_storage
<https://github.com/KDAB/android/tree/master/shared_storage>
YEP - it works, but there’s a drawback:
selecting files only selects one file – haven’t found a way to select
multiple files using KDABs SharedStorage library and this is essential
for users.
Selecting a folder and then creating a file inside the folder works great.
Then I found out, that QDir and QFile not only support file pathes,
but also Content URIs
(https://developer.android.com/reference/android/content/ContentUris).
This is not documented yet, because full ScopedStorage support not
ready yet (https://bugreports.qt.io/browse/QTBUG-99664
<https://bugreports.qt.io/browse/QTBUG-99664>)
But the current implementation helps if using the QML FileDialog on
Android
Select multi files: Using the QML FileDialog I can see the files from
different external locations and I can select multi files, what was
missing from KDABs SharedStorage. I’m getting a list of ContentUris
and can then use QFile directly using the ContentUris
Create File in folder: I can select a folder, was asked for
permission, but then trying to create a file inside the selected
folder, I’m getting errors:
E Qt JAVA : openFdForContentUrl(): No permissions to open Uri
and “Unknown error” from QFile, per ex. using
"content://com.android.externalstorage.documents/tree/primary%3ADocuments/ekke.txt"
Unfortunately using the QML FileDialog I’m getting some warnings:
W libenbwDOCS_x_arm64-v8a.so:
qrc:/android_rcc_bundle/qml/QtQuick/Controls/Styles/Android/LabelStyle.qml:94:
TypeError: Cannot read property 'ENABLED_SELECTED_STATE_SET' of undefined
W libenbwDOCS_x_arm64-v8a.so:
qrc:/android_rcc_bundle/qml/QtQuick/Controls/Styles/Android/LabelStyle.qml:89:
TypeError: Cannot read property 'ENABLED_STATE_SET' of undefined
Conclusion:
Selecting a folder and creating a file I can do using KDABs SharedStorage,
Selecting multiple files I can do using QML FileDialog and have to
live with the warnings.
Any better ideas?
Thx
ekke
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