Implement very basic media library rescanning for Android

Author: Martchus

README.md

@@ -373,6 +373,9 @@ additional remarks:
   also be changed later (in contrast to IDs).
 * If you have already another Syncthing app installed or you have an existing configuration from
   another device, read the next sections for testing/migrating.
+* The app does not automatically trigger media library rescans yet, so e.g. synchronized music
+  might not show up immediately in your music app. However, you can trigger a rescan manually if
+  needed. You can do this per folder from the context menu on the folders page.
 
 ### Testing the app without migrating
 To only test the app without migrating your setup you can follow the steps of this section. Note

tray/android/src/io/github/martchus/syncthingtray/Activity.java

@@ -2,6 +2,7 @@
 
 import android.content.ActivityNotFoundException;
 import android.content.Intent;
+import android.media.MediaScannerConnection;
 import android.os.Build;
 import android.os.Bundle;
 import android.provider.DocumentsContract;
@@ -69,6 +70,16 @@ public boolean openPath(String path) {
         return true;
     }
 
+    public boolean scanPath(String path) {
+        MediaScannerConnection.scanFile(this, new String[]{path}, null, new MediaScannerConnection.OnScanCompletedListener() {
+            public void onScanCompleted(String path, Uri uri) {
+                showToast("Rescan of " + path + " completed");
+            }
+        });
+        showToast("Triggered rescan of " + path);
+        return true;
+    }
+
     public String resolveUri(String uri) {
         return Util.getAbsolutePathFromStorageAccessFrameworkUri(this, Uri.parse(uri));
     }

tray/gui/qml/DirDelegate.qml

@@ -60,6 +60,12 @@ ExpandableDelegate {
                 text: qsTr("Advanced config")
                 icon.source: App.faUrlBase + "cogs"
                 onTriggered: (source) => mainView.stackView.push("AdvancedDirConfigPage.qml", {dirName: modelData.name, dirId: modelData.dirId, stackView: mainView.stackView}, StackView.PushTransition)
+            },
+            Action {
+                text: qsTr("Trigger media rescan")
+                icon.source: App.faUrlBase + "music"
+                enabled: App.scanSupported
+                onTriggered: (source) => App.scanPath(modelData.path)
             }
         ]
     }

tray/gui/quick/app.cpp

@@ -339,6 +339,20 @@ bool App::openPath(const QString &dirId, const QString &relativePath)
     return false;
 }
 
+bool App::scanPath(const QString &path)
+{
+#ifdef Q_OS_ANDROID
+    if (QJniObject(QNativeInterface::QAndroidApplication::context())
+            .callMethod<jboolean>("scanPath", "(Ljava/lang/String;)Z", QJniObject::fromString(path))) {
+        return true;
+    }
+#else
+    Q_UNUSED(path)
+#endif
+    emit error(tr("Scanning is not supported."));
+    return false;
+}
+
 bool App::copyText(const QString &text)
 {
     if (auto *const clipboard = QGuiApplication::clipboard()) {

tray/gui/quick/app.h

@@ -67,6 +67,7 @@ class App : public QObject {
     Q_PROPERTY(QString statusText READ statusText NOTIFY statusInfoChanged)
     Q_PROPERTY(QIcon statusIcon READ statusIcon NOTIFY statusInfoChanged)
     Q_PROPERTY(QString additionalStatusText READ additionalStatusText NOTIFY statusInfoChanged)
+    Q_PROPERTY(bool scanSupported READ isScanSupported CONSTANT)
     QML_ELEMENT
     QML_SINGLETON
 
@@ -187,6 +188,14 @@ class App : public QObject {
     {
         return m_statusInfo.additionalStatusText();
     }
+    bool isScanSupported() const
+    {
+#ifdef Q_OS_ANDROID
+        return true;
+#else
+        return false;
+#endif
+    }
 
     // helper functions invoked from QML
     Q_INVOKABLE bool loadMain();
@@ -204,6 +213,7 @@ class App : public QObject {
     Q_INVOKABLE bool exportSettings(const QUrl &url, const QJSValue &callback = QJSValue());
     Q_INVOKABLE bool openPath(const QString &path);
     Q_INVOKABLE bool openPath(const QString &dirId, const QString &relativePath);
+    Q_INVOKABLE bool scanPath(const QString &path);
     Q_INVOKABLE bool copyText(const QString &text);
     Q_INVOKABLE bool copyPath(const QString &dirId, const QString &relativePath);
     Q_INVOKABLE QString getClipboardText() const;