WIP: basename on android

TODO:
- Integrate for file transfers (let UI pass target filename)
- Refresh elsewhere as well
- Provide fallback if permission expired
- Expose proper API

core/os/os-android.cpp

@@ -2,6 +2,7 @@
 #include <QAndroidJniObject>
 #include <QAndroidJniEnvironment>
 #include <QAndroidActivityResultReceiver>
+#include <QScopeGuard>
 
 #include "os.h"
 
@@ -78,3 +79,53 @@ FILE *fopen_utf8(const char *path, const char *mode)
 
     return fdopen(fd, mode);
 }
+
+char *android_basename(const char *path)
+{
+    const char pattern[] = "content:";
+    if(strncmp(pattern, path, sizeof(pattern)-1) != 0)
+        return nullptr;
+
+    QAndroidJniObject jpath = QAndroidJniObject::fromString(QString::fromUtf8(path));
+    QAndroidJniObject uri = QAndroidJniObject::callStaticObjectMethod(
+                "android/net/Uri", "parse", "(Ljava/lang/String;)Landroid/net/Uri;",
+                jpath.object<jstring>());
+
+    QAndroidJniObject contentResolver = QtAndroid::androidActivity()
+            .callObjectMethod("getContentResolver",
+                              "()Landroid/content/ContentResolver;");
+
+    QAndroidJniEnvironment env;
+    QAndroidJniObject col = QAndroidJniObject::getStaticObjectField("android/provider/OpenableColumns", "DISPLAY_NAME", "Ljava/lang/String;");
+    QAndroidJniObject proj = env->NewObjectArray(1, env->FindClass("java/lang/String"), col.object<jstring>());
+
+    QAndroidJniObject cursor = contentResolver.callObjectMethod("query", "(Landroid/net/Uri;[Ljava/lang/String;Landroid/os/Bundle;Landroid/os/CancellationSignal;)Landroid/database/Cursor;", uri.object<jobject>(), proj.object<jobject>(), nullptr, nullptr);
+    if (env->ExceptionCheck())
+    {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+        return nullptr;
+    }
+
+    if(!cursor.isValid())
+        return nullptr;
+
+    auto closeCursor = qScopeGuard([&] { cursor.callMethod<void>("close", "()V"); });
+
+    bool hasContent = cursor.callMethod<jboolean>("moveToFirst", "()Z");
+    if (env->ExceptionCheck())
+    {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+        return nullptr;
+    }
+
+    if(!hasContent)
+        return nullptr;
+
+    QAndroidJniObject name = cursor.callObjectMethod("getString", "(I)Ljava/lang/String;", 0);
+    if (!name.isValid())
+        return nullptr;
+
+    return strdup(name.toString().toUtf8().data());
+}

qml/Firebird/UIComponents/FileSelect.qml

@@ -46,7 +46,7 @@ RowLayout {
             Layout.preferredWidth: 100
 
             font.italic: filePath === ""
-            text: filePath === "" ? qsTr("(none)") : Emu.basename(filePath)
+            text: { forceRefresh; return filePath === "" ? qsTr("(none)") : Emu.basename(filePath); }
             color: { forceRefresh; return ((!selectExisting && Emu.saveDialogSupported()) || filePath === "" || Emu.fileExists(filePath)) ? paletteActive.text : "red"; }
         }
 

qmlbridge.cpp

@@ -286,14 +286,12 @@ QString QMLBridge::basename(QString path)
     if(path.isEmpty())
         return tr("None");
 
-    if(path.startsWith(QStringLiteral("content://")))
-    {
-        auto parts = path.splitRef(QStringLiteral("%2F"), QString::SkipEmptyParts, Qt::CaseInsensitive);
-        if(parts.length() > 1)
-            return parts.last().toString();
-
-        return tr("(Android File)");
-    }
+#ifdef Q_OS_ANDROID
+    extern char *android_basename(const char *path);
+    QScopedPointer<char, QScopedPointerPodDeleter> android_bn{android_basename(path.toUtf8().data())};
+    if(android_bn)
+        return QString::fromUtf8(android_bn.data());
+#endif
 
     return QFileInfo(path).fileName();
 }