android/usb: simply restart the download after receiving permission

If the user tries to download from a device that he hasn't given the app
permission to read from, Android will pop up a dialogue asking for that
permission. With this after giving the permission we continue (well,
technically, restart) the download which is likely the expected behavior.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

android-mobile/src/org/subsurfacedivelog/mobile/SubsurfaceMobileActivity.java

@@ -28,6 +28,7 @@ public class SubsurfaceMobileActivity extends QtActivity
 	public static boolean isInitialized;
 	private static final String TAG = "subsurfacedivelog.mobile";
 	public static native void setUsbDevice(UsbDevice usbDevice);
+	public static native void restartDownload(UsbDevice usbDevice);
 	private static Context appContext;
 
 	// we need to provide two endpoints:
@@ -116,8 +117,13 @@ public class SubsurfaceMobileActivity extends QtActivity
 			if ("org.subsurfacedivelog.mobile.USB_PERMISSION".equals(action)) {
 				synchronized (this) {
 					if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
-						Log.d(TAG, "USB device permission granted");
+						UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
-						setUsbDevice(null);
+						if (device == null) {
+							Log.i(TAG, " permission granted but null device");
+							return;
+						}
+						Log.d(TAG, "USB device permission granted for " + device.getDeviceName());
+						restartDownload(device);
 					} else {
 						Log.d(TAG, "USB device permission denied");
 					}

core/android.cpp

@@ -181,7 +181,7 @@ Java_org_subsurfacedivelog_mobile_SubsurfaceMobileActivity_setUsbDevice(JNIEnv *
 	if (usbDevice.isValid()) {
 		android_usb_serial_device_descriptor descriptor = getDescriptor(usbDevice);
 
-		LOG(QString("called by intent for device %1").arg(QString::fromStdString(descriptor.uiRepresentation)));
+		LOG(QString("called by connect intent for device %1").arg(QString::fromStdString(descriptor.uiRepresentation)));
 	}
 #if defined(SUBSURFACE_MOBILE)
 	QMLManager::instance()->showDownloadPage(usbDevice);
@@ -189,6 +189,25 @@ Java_org_subsurfacedivelog_mobile_SubsurfaceMobileActivity_setUsbDevice(JNIEnv *
 	return;
 }
 
+JNIEXPORT void JNICALL
+Java_org_subsurfacedivelog_mobile_SubsurfaceMobileActivity_restartDownload(JNIEnv *env,
+	jobject obj,
+	jobject javaUsbDevice)
+{
+	Q_UNUSED (obj)
+	Q_UNUSED (env)
+	QAndroidJniObject usbDevice(javaUsbDevice);
+	if (usbDevice.isValid()) {
+		android_usb_serial_device_descriptor descriptor = getDescriptor(usbDevice);
+
+		LOG(QString("called by permission granted intent for device %1").arg(QString::fromStdString(descriptor.uiRepresentation)));
+	}
+#if defined(SUBSURFACE_MOBILE)
+	QMLManager::instance()->restartDownload(usbDevice);
+#endif
+	return;
+}
+
 /* NOP wrappers to comform with windows.c */
 int subsurface_rename(const char *path, const char *newpath)
 {

mobile-widgets/qml/DownloadFromDiveComputer.qml

@@ -293,6 +293,24 @@ Kirigami.Page {
 			Layout.fillWidth: true
 			Layout.topMargin: Kirigami.Units.smallSpacing
 			spacing: Kirigami.Units.smallSpacing
+
+
+			function doDownload() {
+				var message = "DCDownloadThread started for " + manager.DC_vendor + " " + manager.DC_product + " on " + manager.DC_devName;
+				message += " downloading " + (manager.DC_forceDownload ? "all" : "only new" ) + " dives";
+				manager.appendTextToLog(message)
+				progressBar.visible = true
+				divesDownloaded = false // this allows the progressMessage to be displayed
+				importModel.startDownload()
+			}
+
+			Connections {
+				target: manager
+				onRestartDownloadSignal: {
+					buttonBar.doDownload()
+				}
+			}
+
 			TemplateButton {
 				id: download
 				text: qsTr("Download")
@@ -322,12 +340,7 @@ Kirigami.Page {
 						manager.DC_bluetoothMode = false;
 						manager.DC_devName = connectionString;
 					}
-					var message = "DCDownloadThread started for " + manager.DC_vendor + " " + manager.DC_product + " on " + manager.DC_devName;
+					buttonBar.doDownload()
-					message += " downloading " + (manager.DC_forceDownload ? "all" : "only new" ) + " dives";
-					manager.appendTextToLog(message)
-					progressBar.visible = true
-					divesDownloaded = false // this allows the progressMessage to be displayed
-					importModel.startDownload()
 				}
 			}
 			TemplateButton {

mobile-widgets/qmlmanager.cpp

@@ -2120,9 +2120,8 @@ void QMLManager::androidUsbPopoulateConnections()
 void QMLManager::showDownloadPage(QAndroidJniObject usbDevice)
 {
 	if (!usbDevice.isValid()) {
-		// this happens if we get called by the permission granted intent
+		// this really shouldn't happen anymore, but just in case...
-		// if that happens, just make sure the DownloadPage is reopened
+		m_pluggedInDeviceName = "";
-		m_pluggedInDeviceName = QString("reopen");
 	} else {
 		// repopulate the connection list
 		rescanConnections();
@@ -2135,6 +2134,25 @@ void QMLManager::showDownloadPage(QAndroidJniObject usbDevice)
 	}
 	emit pluggedInDeviceNameChanged();
 }
+
+void QMLManager::restartDownload(QAndroidJniObject usbDevice)
+{
+	// this gets called if we received a permission intent after
+	// already trying to download from USB
+	if (!usbDevice.isValid()) {
+		appendTextToLog("permission intent with invalid UsbDevice - ignoring");
+	} else {
+		// inform that QML code that it should retry downloading
+		// we get the usbDevice again and could verify that this is
+		// still the same - but I don't see how this could change while we are waiting
+		// for permission
+		android_usb_serial_device_descriptor usbDeviceDescriptor = getDescriptor(usbDevice);
+		appendTextToLog(QString("got permission from Android, restarting download for %1")
+				.arg(QString::fromStdString(usbDeviceDescriptor.uiRepresentation)));
+		emit restartDownloadSignal();
+	}
+}
+
 #endif
 
 void QMLManager::setFilter(const QString filterText, int index)

mobile-widgets/qmlmanager.h

@@ -235,6 +235,7 @@ public slots:
 	void rescanConnections();
 #if defined(Q_OS_ANDROID)
 	void showDownloadPage(QAndroidJniObject usbDevice);
+	void restartDownload(QAndroidJniObject usbDevice);
 	void androidUsbPopoulateConnections();
 	QString getProductVendorConnectionIdx(android_usb_serial_device_descriptor descriptor);
 #endif
@@ -307,6 +308,7 @@ signals:
 	void oldStatusChanged();
 	void undoTextChanged();
 	void redoTextChanged();
+	void restartDownloadSignal();
 
 	// From upload process
 	void uploadFinish(bool success, const QString &text);