[platform/android] Add native file dialog

Add basic native file open dialog on Android. Not all features of QFileDialog can be mapped to the
Android file dialog.

Most notably there is no "Save" dialog. The dialog returns a content:// URL. Patch 251038 adds
support for those to QFile.

Change-Id: I13d02103edcd9a089afcce8193432f24b2e0fe43
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

4 files changed, 239 insertions, 2 deletions

diff --git a/src/plugins/platforms/android/android.pro b/src/plugins/platforms/android/android.pro
index 73db9e93a3..f91db1ab5f 100644
--- a/src/plugins/platforms/android/android.pro
+++ b/src/plugins/platforms/android/android.pro
@@ -46,7 +46,8 @@ SOURCES += $$PWD/androidplatformplugin.cpp \
            $$PWD/qandroidplatformopenglcontext.cpp \
            $$PWD/qandroidplatformforeignwindow.cpp \
            $$PWD/qandroideventdispatcher.cpp \
-           $$PWD/qandroidplatformoffscreensurface.cpp
+           $$PWD/qandroidplatformoffscreensurface.cpp \
+           $$PWD/qandroidplatformfiledialoghelper.cpp
 
 HEADERS += $$PWD/qandroidplatformintegration.h \
            $$PWD/androiddeadlockprotector.h \
@@ -75,7 +76,8 @@ HEADERS += $$PWD/qandroidplatformintegration.h \
            $$PWD/qandroidplatformopenglcontext.h \
            $$PWD/qandroidplatformforeignwindow.h \
            $$PWD/qandroideventdispatcher.h \
-           $$PWD/qandroidplatformoffscreensurface.h
+           $$PWD/qandroidplatformoffscreensurface.h \
+           $$PWD/qandroidplatformfiledialoghelper.h
 
 qtConfig(android-style-assets): SOURCES += $$PWD/extract.cpp
 else: SOURCES += $$PWD/extract-dummy.cpp
diff --git a/src/plugins/platforms/android/qandroidplatformfiledialoghelper.cpp b/src/plugins/platforms/android/qandroidplatformfiledialoghelper.cpp
new file mode 100644
index 0000000000..4fb271a75c
--- /dev/null
+++ b/src/plugins/platforms/android/qandroidplatformfiledialoghelper.cpp
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB)
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qandroidplatformfiledialoghelper.h"
+
+#include <androidjnimain.h>
+#include <private/qjni_p.h>
+#include <jni.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtAndroidFileDialogHelper {
+
+#define RESULT_OK -1
+#define REQUEST_CODE 1305 // Arbitrary
+
+QAndroidPlatformFileDialogHelper::QAndroidPlatformFileDialogHelper()
+    : QPlatformFileDialogHelper()
+    , m_selectedFile()
+{
+}
+
+bool QAndroidPlatformFileDialogHelper::handleActivityResult(jint requestCode, jint resultCode, jobject data)
+{
+    if (requestCode != REQUEST_CODE)
+        return false;
+
+    if (resultCode == RESULT_OK) {
+        const QJNIObjectPrivate intent = QJNIObjectPrivate::fromLocalRef(data);
+        const QJNIObjectPrivate uri = intent.callObjectMethod("getData", "()Landroid/net/Uri;");
+        const QString uriStr = uri.callObjectMethod("toString", "()Ljava/lang/String;").toString();
+        m_selectedFile = QUrl(uriStr);
+        Q_EMIT fileSelected(m_selectedFile);
+        Q_EMIT accept();
+    } else {
+        Q_EMIT reject();
+    }
+
+    return true;
+}
+
+bool QAndroidPlatformFileDialogHelper::show(Qt::WindowFlags windowFlags, Qt::WindowModality windowModality, QWindow *parent)
+{
+    Q_UNUSED(windowFlags)
+    Q_UNUSED(windowModality)
+    Q_UNUSED(parent)
+
+    if (options()->fileMode() != QFileDialogOptions::FileMode::ExistingFile)
+        return false;
+
+    QtAndroidPrivate::registerActivityResultListener(this);
+
+    const QJNIObjectPrivate ACTION_OPEN_DOCUMENT = QJNIObjectPrivate::getStaticObjectField("android/content/Intent", "ACTION_OPEN_DOCUMENT", "Ljava/lang/String;");
+    QJNIObjectPrivate intent("android/content/Intent", "(Ljava/lang/String;)V", ACTION_OPEN_DOCUMENT.object());
+    const QJNIObjectPrivate CATEGORY_OPENABLE = QJNIObjectPrivate::getStaticObjectField("android/content/Intent", "CATEGORY_OPENABLE", "Ljava/lang/String;");
+    intent.callObjectMethod("addCategory", "(Ljava/lang/String;)Landroid/content/Intent;", CATEGORY_OPENABLE.object());
+    intent.callObjectMethod("setType", "(Ljava/lang/String;)Landroid/content/Intent;", QJNIObjectPrivate::fromString(QStringLiteral("*/*")).object());
+
+    const QJNIObjectPrivate activity(QtAndroid::activity());
+    activity.callMethod<void>("startActivityForResult", "(Landroid/content/Intent;I)V", intent.object(), REQUEST_CODE);
+
+    return true;
+}
+
+void QAndroidPlatformFileDialogHelper::exec()
+{
+}
+
+void QAndroidPlatformFileDialogHelper::hide()
+{
+}
+
+QString QAndroidPlatformFileDialogHelper::selectedNameFilter() const
+{
+    return QString();
+}
+
+void QAndroidPlatformFileDialogHelper::selectNameFilter(const QString &filter)
+{
+    Q_UNUSED(filter)
+}
+
+void QAndroidPlatformFileDialogHelper::setFilter()
+{
+}
+
+QList<QUrl> QAndroidPlatformFileDialogHelper::selectedFiles() const
+{
+    return {m_selectedFile};
+}
+
+void QAndroidPlatformFileDialogHelper::selectFile(const QUrl &file)
+{
+    Q_UNUSED(file)
+}
+
+QUrl QAndroidPlatformFileDialogHelper::directory() const
+{
+    return QUrl();
+}
+
+void QAndroidPlatformFileDialogHelper::setDirectory(const QUrl &directory)
+{
+    Q_UNUSED(directory)
+}
+
+bool QAndroidPlatformFileDialogHelper::defaultNameFilterDisables() const
+{
+    return false;
+}
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/platforms/android/qandroidplatformfiledialoghelper.h b/src/plugins/platforms/android/qandroidplatformfiledialoghelper.h
new file mode 100644
index 0000000000..e445aa2fef
--- /dev/null
+++ b/src/plugins/platforms/android/qandroidplatformfiledialoghelper.h
@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB)
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QANDROIDPLATFORMFILEDIALOGHELPER_H
+#define QANDROIDPLATFORMFILEDIALOGHELPER_H
+
+#include <jni.h>
+#include <qpa/qplatformdialoghelper.h>
+#include <QtCore/private/qjnihelpers_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtAndroidFileDialogHelper {
+
+class QAndroidPlatformFileDialogHelper: public QPlatformFileDialogHelper, public QtAndroidPrivate::ActivityResultListener
+{
+    Q_OBJECT
+
+public:
+    QAndroidPlatformFileDialogHelper();
+    void exec() override;
+
+    bool show(Qt::WindowFlags windowFlags,
+              Qt::WindowModality windowModality,
+              QWindow *parent) override;
+    void hide() override;
+
+    QString selectedNameFilter() const override;
+    void selectNameFilter(const QString &filter) override;
+    void setFilter() override;
+    QList<QUrl> selectedFiles() const override;
+    void selectFile(const QUrl &file) override;
+    QUrl directory() const override;
+    void setDirectory(const QUrl &directory) override;
+    bool defaultNameFilterDisables() const override;
+    bool handleActivityResult(jint requestCode, jint resultCode, jobject data) override;
+
+private:
+    QUrl m_selectedFile;
+};
+
+}
+QT_END_NAMESPACE
+
+#endif // QANDROIDPLATFORMFILEDIALOGHELPER_H
diff --git a/src/plugins/platforms/android/qandroidplatformtheme.cpp b/src/plugins/platforms/android/qandroidplatformtheme.cpp
index b891407c44..a78a62337f 100644
--- a/src/plugins/platforms/android/qandroidplatformtheme.cpp
+++ b/src/plugins/platforms/android/qandroidplatformtheme.cpp
@@ -44,6 +44,7 @@
 #include "qandroidplatformmenu.h"
 #include "qandroidplatformmenuitem.h"
 #include "qandroidplatformdialoghelpers.h"
+#include "qandroidplatformfiledialoghelper.h"
 
 #include <QCoreApplication>
 #include <QDebug>
@@ -512,6 +513,8 @@ bool QAndroidPlatformTheme::usePlatformNativeDialog(QPlatformTheme::DialogType t
 {
     if (type == MessageDialog)
         return qEnvironmentVariableIntValue("QT_USE_ANDROID_NATIVE_DIALOGS") == 1;
+    if (type == FileDialog)
+        return true;
     return false;
 }
 
@@ -520,6 +523,8 @@ QPlatformDialogHelper *QAndroidPlatformTheme::createPlatformDialogHelper(QPlatfo
     switch (type) {
     case MessageDialog:
         return new QtAndroidDialogHelpers::QAndroidPlatformMessageDialogHelper;
+    case FileDialog:
+        return new QtAndroidFileDialogHelper::QAndroidPlatformFileDialogHelper;
     default:
         return 0;
     }