Android: Replace occurrences of FilePath::toString

Use FilePath capabilities instead of QFile/QDir where applicable.
More informative error messages.
Add a helper function in androidconfigurations.cpp to reduce amount of repeated code.

Change-Id: I02457461713caf8355601af34679fb6c2f4090a7
Reviewed-by: Alessandro Portale <[email protected]>

19 files changed, 176 insertions, 149 deletions

diff --git a/src/plugins/android/androidbuildapkstep.cpp b/src/plugins/android/androidbuildapkstep.cpp
index 8a21d17b84f..8ed611b19c4 100644
--- a/src/plugins/android/androidbuildapkstep.cpp
+++ b/src/plugins/android/androidbuildapkstep.cpp
@@ -413,10 +413,10 @@ bool AndroidBuildApkWidget::isOpenSslLibsIncluded()
 
 QString AndroidBuildApkWidget::openSslIncludeFileContent(const FilePath &projectPath)
 {
-    QString openSslPath = AndroidConfig::openSslLocation().toString();
-    if (projectPath.endsWith(".pro"))
+    QString openSslPath = AndroidConfig::openSslLocation().path();
+    if (projectPath.suffixView() == u"pro")
         return "android: include(" + openSslPath + "/openssl.pri)";
-    if (projectPath.endsWith("CMakeLists.txt"))
+    if (projectPath.fileNameView() == u"CMakeLists.txt")
         return "if (ANDROID)\n    include(" + openSslPath + "/CMakeLists.txt)\nendif()";
     return {};
 }
@@ -747,7 +747,7 @@ Tasking::GroupItem AndroidBuildApkStep::runRecipe()
         QString applicationBinary;
         if (!version->supportsMultipleQtAbis()) {
             QTC_ASSERT(androidAbis.size() == 1, return false);
-            applicationBinary = buildSystem()->buildTarget(buildKey).targetFilePath.toString();
+            applicationBinary = buildSystem()->buildTarget(buildKey).targetFilePath.path();
             FilePath androidLibsDir = androidBuildDir / "libs" / androidAbis.first();
             for (const FilePath &target : targets) {
                 if (!copyFileIfNewer(target, androidLibsDir.pathAppended(target.fileName()))) {
@@ -804,16 +804,20 @@ Tasking::GroupItem AndroidBuildApkStep::runRecipe()
 
         QString qmlRootPath = bs->extraData(buildKey, "QML_ROOT_PATH").toString();
         if (qmlRootPath.isEmpty())
-            qmlRootPath = target()->project()->rootProjectDirectory().toString();
+            qmlRootPath = target()->project()->rootProjectDirectory().path();
         deploySettings["qml-root-path"] = qmlRootPath;
 
-        QFile f{m_inputFile.toString()};
-        if (!f.open(QIODevice::WriteOnly)) {
-            reportWarningOrError(Tr::tr("Cannot open androiddeployqt input file \"%1\" for writing.")
-                                     .arg(m_inputFile.toUserOutput()), Task::Error);
+        const expected_str<qint64> result = m_inputFile.writeFileContents(QJsonDocument{deploySettings}.toJson());
+        if (!result) {
+            reportWarningOrError(
+                Tr::tr("Cannot open androiddeployqt input file \"%1\" for writing.")
+                    .arg(m_inputFile.toUserOutput())
+                    .append(' ')
+                    .append(result.error()),
+                Task::Error);
             return false;
         }
-        f.write(QJsonDocument{deploySettings}.toJson());
+
         return true;
     };
 
diff --git a/src/plugins/android/androidconfigurations.cpp b/src/plugins/android/androidconfigurations.cpp
index ccdee4190a3..6cb65e4eed6 100644
--- a/src/plugins/android/androidconfigurations.cpp
+++ b/src/plugins/android/androidconfigurations.cpp
@@ -64,6 +64,23 @@ using namespace Utils;
 
 namespace {
 static Q_LOGGING_CATEGORY(avdConfigLog, "qtc.android.androidconfig", QtWarningMsg)
+
+std::optional<FilePath> tryGetFirstDirectory(const FilePath &path, const QStringList &nameFilters)
+{
+    std::optional<FilePath> ret;
+    path.iterateDirectory(
+        [&ret](const FilePath &p) {
+            if (p.exists()) {
+                ret = p;
+                return IterationPolicy::Stop;
+            }
+
+            return IterationPolicy::Continue;
+        },
+        FileFilter{nameFilters, QDir::Dirs});
+
+    return ret;
+}
 }
 
 namespace Android {
@@ -120,9 +137,9 @@ const Key changeTimeStamp("ChangeTimeStamp");
 const char sdkToolsVersionKey[] = "Pkg.Revision";
 const char ndkRevisionKey[] = "Pkg.Revision";
 
-static QString sdkSettingsFileName()
+static FilePath sdkSettingsFileName()
 {
-    return Core::ICore::installerResourcePath("android.xml").toString();
+    return Core::ICore::installerResourcePath("android.xml");
 }
 
 static QString ndkPackageMarker()
@@ -316,14 +333,18 @@ void AndroidConfigData::load(const QtcSettings &settings)
     m_sdkFullyConfigured = settings.value(SdkFullyConfiguredKey, false).toBool();
 
     PersistentSettingsReader reader;
-    if (reader.load(FilePath::fromString(sdkSettingsFileName()))
-            && settings.value(changeTimeStamp).toInt() != QFileInfo(sdkSettingsFileName()).lastModified().toMSecsSinceEpoch() / 1000) {
+    if (reader.load(sdkSettingsFileName())
+            && settings.value(changeTimeStamp).toInt() != sdkSettingsFileName().lastModified().toMSecsSinceEpoch() / 1000) {
         // persisten settings
-        m_sdkLocation = FilePath::fromUserInput(reader.restoreValue(SDKLocationKey, m_sdkLocation.toString()).toString()).cleanPath();
+        m_sdkLocation = FilePath::fromSettings(
+                            reader.restoreValue(SDKLocationKey, m_sdkLocation.toSettings()))
+                            .cleanPath();
         m_customNdkList = reader.restoreValue(CustomNdkLocationsKey).toStringList();
         m_sdkManagerToolArgs = reader.restoreValue(SDKManagerToolArgsKey, m_sdkManagerToolArgs).toStringList();
-        m_openJDKLocation = FilePath::fromString(reader.restoreValue(OpenJDKLocationKey, m_openJDKLocation.toString()).toString());
-        m_openSslLocation = FilePath::fromString(reader.restoreValue(OpenSslPriLocationKey, m_openSslLocation.toString()).toString());
+        m_openJDKLocation = FilePath::fromSettings(
+            reader.restoreValue(OpenJDKLocationKey, m_openJDKLocation.toSettings()));
+        m_openSslLocation = FilePath::fromSettings(
+            reader.restoreValue(OpenSslPriLocationKey, m_openSslLocation.toSettings()));
         m_automaticKitCreation = reader.restoreValue(AutomaticKitCreationKey, m_automaticKitCreation).toBool();
         m_sdkFullyConfigured = reader.restoreValue(SdkFullyConfiguredKey, m_sdkFullyConfigured).toBool();
         // persistent settings
@@ -340,17 +361,17 @@ void AndroidConfigData::load(const QtcSettings &settings)
 
 void AndroidConfigData::save(QtcSettings &settings) const
 {
-    QFileInfo fileInfo(sdkSettingsFileName());
-    if (fileInfo.exists())
-        settings.setValue(changeTimeStamp, fileInfo.lastModified().toMSecsSinceEpoch() / 1000);
+    const FilePath sdkSettingsFile = sdkSettingsFileName();
+    if (sdkSettingsFile.exists())
+        settings.setValue(changeTimeStamp, sdkSettingsFile.lastModified().toMSecsSinceEpoch() / 1000);
 
     // user settings
-    settings.setValue(SDKLocationKey, m_sdkLocation.toString());
+    settings.setValue(SDKLocationKey, m_sdkLocation.toSettings());
     settings.setValue(CustomNdkLocationsKey, m_customNdkList);
-    settings.setValue(DefaultNdkLocationKey, m_defaultNdk.toString());
+    settings.setValue(DefaultNdkLocationKey, m_defaultNdk.toSettings());
     settings.setValue(SDKManagerToolArgsKey, m_sdkManagerToolArgs);
-    settings.setValue(OpenJDKLocationKey, m_openJDKLocation.toString());
-    settings.setValue(OpenSslPriLocationKey, m_openSslLocation.toString());
+    settings.setValue(OpenJDKLocationKey, m_openJDKLocation.toSettings());
+    settings.setValue(OpenSslPriLocationKey, m_openSslLocation.toSettings());
     settings.setValue(EmulatorArgsKey, m_emulatorArgs);
     settings.setValue(AutomaticKitCreationKey, m_automaticKitCreation);
     settings.setValue(SdkFullyConfiguredKey, m_sdkFullyConfigured);
@@ -373,13 +394,17 @@ void AndroidConfigData::parseDependenciesJson()
         sdkConfigFile.copyFile(sdkConfigUserFile);
     }
 
-    QFile jsonFile(sdkConfigUserFile.toString());
-    if (!jsonFile.open(QIODevice::ReadOnly)) {
-        qCDebug(avdConfigLog, "Couldn't open JSON config file %s.", qPrintable(jsonFile.fileName()));
+    const expected_str<QByteArray> result = sdkConfigUserFile.fileContents();
+    if (!result) {
+        qCDebug(
+            avdConfigLog,
+            "Couldn't open JSON config file %s. %s",
+            qPrintable(sdkConfigUserFile.fileName()),
+            qPrintable(result.error()));
         return;
     }
 
-    QJsonObject jsonObject = QJsonDocument::fromJson(jsonFile.readAll()).object();
+    QJsonObject jsonObject = QJsonDocument::fromJson(*result).object();
 
     if (jsonObject.contains(CommonKey) && jsonObject[CommonKey].isObject()) {
         QJsonObject commonObject = jsonObject[CommonKey].toObject();
@@ -449,14 +474,11 @@ static QList<int> availableNdkPlatformsLegacy(const FilePath &ndkLocation)
 {
     QList<int> availableNdkPlatforms;
 
-    ndkLocation
-        .pathAppended("platforms")
+    ndkLocation.pathAppended("platforms")
         .iterateDirectory(
             [&availableNdkPlatforms](const FilePath &filePath) {
-                availableNdkPlatforms.push_back(
-                    filePath.toString()
-                        .mid(filePath.path().lastIndexOf('-') + 1)
-                        .toInt());
+                const QString fileName = filePath.fileName();
+                availableNdkPlatforms.push_back(fileName.mid(fileName.lastIndexOf('-') + 1).toInt());
                 return IterationPolicy::Continue;
             },
             {{"android-*"}, QDir::Dirs});
@@ -576,17 +598,14 @@ void setTemporarySdkToolsPath(const FilePath &path)
 
 FilePath toolchainPathFromNdk(const FilePath &ndkLocation, OsType hostOs)
 {
-    const FilePath tcPath = ndkLocation / "toolchains/";
-    FilePath toolchainPath;
-    QDirIterator llvmIter(tcPath.toString(), {"llvm*"}, QDir::Dirs);
-    if (llvmIter.hasNext()) {
-        llvmIter.next();
-        toolchainPath = tcPath / llvmIter.fileName() / "prebuilt/";
-    }
+    const FilePath tcPath = ndkLocation / "toolchains";
 
-    if (toolchainPath.isEmpty())
+    const std::optional<FilePath> llvmDir = tryGetFirstDirectory(tcPath, {"llvm*"});
+    if (!llvmDir)
         return {};
 
+    const FilePath prebuiltDir = *llvmDir / "prebuilt";
+
     // detect toolchain host
     QStringList hostPatterns;
     switch (hostOs) {
@@ -602,13 +621,11 @@ FilePath toolchainPathFromNdk(const FilePath &ndkLocation, OsType hostOs)
     default: /* unknown host */ return {};
     }
 
-    QDirIterator iter(toolchainPath.toString(), hostPatterns, QDir::Dirs);
-    if (iter.hasNext()) {
-        iter.next();
-        return toolchainPath / iter.fileName();
-    }
+    const std::optional<FilePath> toolchainDir = tryGetFirstDirectory(prebuiltDir, hostPatterns);
+    if (!toolchainDir)
+        return {};
 
-    return {};
+    return *toolchainDir;
 }
 
 FilePath toolchainPath(const QtVersion *qtVersion)
@@ -751,7 +768,7 @@ bool isValidNdk(const QString &ndkLocation)
 
     const FilePath ndkPlatformsDir = ndkPath.pathAppended("platforms");
     if (version.majorVersion() <= 22
-            && (!ndkPlatformsDir.exists() || ndkPlatformsDir.toString().contains(' ')))
+        && (!ndkPlatformsDir.exists() || ndkPlatformsDir.pathView().contains(' ')))
         return false;
     return true;
 }
@@ -799,7 +816,7 @@ QVersionNumber sdkToolsVersion()
         return {};
 
     const FilePath sdkToolsPropertiesPath = sdkToolsVersionPath();
-    const QSettings settings(sdkToolsPropertiesPath.toString(), QSettings::IniFormat);
+    const QSettings settings(sdkToolsPropertiesPath.toFSPathString(), QSettings::IniFormat);
     return QVersionNumber::fromString(settings.value(sdkToolsVersionKey).toString());
 }
 
@@ -807,9 +824,8 @@ QVersionNumber buildToolsVersion()
 {
     //TODO: return version according to qt version
     QVersionNumber maxVersion;
-    QDir buildToolsDir(config().m_sdkLocation.pathAppended("build-tools").toString());
-    const auto files = buildToolsDir.entryInfoList(QDir::Dirs|QDir::NoDotAndDotDot);
-    for (const QFileInfo &file: files)
+    const FilePath buildToolsPath = config().m_sdkLocation.pathAppended("build-tools");
+    for (const FilePath &file : buildToolsPath.dirEntries(QDir::Dirs | QDir::NoDotAndDotDot))
         maxVersion = qMax(maxVersion, QVersionNumber::fromString(file.fileName()));
     return maxVersion;
 }
@@ -842,7 +858,7 @@ QVersionNumber ndkVersion(const FilePath &ndkPath)
     const FilePath ndkPropertiesPath = ndkPath.pathAppended("source.properties");
     if (ndkPropertiesPath.exists()) {
         // source.properties files exists in NDK version > 11
-        QSettings settings(ndkPropertiesPath.toString(), QSettings::IniFormat);
+        QSettings settings(ndkPropertiesPath.toFSPathString(), QSettings::IniFormat);
         auto versionStr = settings.value(ndkRevisionKey).toString();
         version = QVersionNumber::fromString(versionStr);
     } else {
@@ -1000,7 +1016,6 @@ QString toolchainHost(const QtVersion *qtVersion)
 QString toolchainHostFromNdk(const FilePath &ndkPath)
 {
     // detect toolchain host
-    QString toolchainHost;
     QStringList hostPatterns;
     switch (HostOsInfo::hostOs()) {
     case OsTypeLinux:
@@ -1013,18 +1028,15 @@ QString toolchainHostFromNdk(const FilePath &ndkPath)
         hostPatterns << QLatin1String("darwin*");
         break;
     default: /* unknown host */
-        return toolchainHost;
+        return {};
     }
 
-    QDirIterator jt(ndkPath.pathAppended("prebuilt").toString(),
-                    hostPatterns,
-                    QDir::Dirs);
-    if (jt.hasNext()) {
-        jt.next();
-        toolchainHost = jt.fileName();
-    }
+    const std::optional<FilePath> toolchainDir
+        = tryGetFirstDirectory(ndkPath.pathAppended("prebuilt"), hostPatterns);
+    if (!toolchainDir)
+        return {};
 
-    return toolchainHost;
+    return toolchainDir->fileName();
 }
 
 QString emulatorArgs() { return config().m_emulatorArgs; }
@@ -1366,8 +1378,9 @@ void AndroidConfigurations::updateAutomaticKitList()
         if (DeviceTypeKitAspect::deviceTypeId(k) == Constants::ANDROID_DEVICE_TYPE) {
             if (k->value(Constants::ANDROID_KIT_NDK).isNull() || k->value(Constants::ANDROID_KIT_SDK).isNull()) {
                 if (QtVersion *qt = QtKitAspect::qtVersion(k)) {
-                    k->setValueSilently(Constants::ANDROID_KIT_NDK, AndroidConfig::ndkLocation(qt).toString());
-                    k->setValue(Constants::ANDROID_KIT_SDK, AndroidConfig::sdkLocation().toString());
+                    k->setValueSilently(
+                        Constants::ANDROID_KIT_NDK, AndroidConfig::ndkLocation(qt).toSettings());
+                    k->setValue(Constants::ANDROID_KIT_SDK, AndroidConfig::sdkLocation().toSettings());
                 }
             }
         }
@@ -1438,8 +1451,10 @@ void AndroidConfigurations::updateAutomaticKitList()
                 k->setUnexpandedDisplayName(Tr::tr("Android %1 Clang %2")
                                                 .arg(versionStr)
                                                 .arg(getMultiOrSingleAbiString(abis)));
-                k->setValueSilently(Constants::ANDROID_KIT_NDK, AndroidConfig::ndkLocation(qt).toString());
-                k->setValueSilently(Constants::ANDROID_KIT_SDK, AndroidConfig::sdkLocation().toString());
+                k->setValueSilently(
+                    Constants::ANDROID_KIT_NDK, AndroidConfig::ndkLocation(qt).toSettings());
+                k->setValueSilently(
+                    Constants::ANDROID_KIT_SDK, AndroidConfig::sdkLocation().toSettings());
             };
 
             if (existingKit) {
diff --git a/src/plugins/android/androidcreatekeystorecertificate.cpp b/src/plugins/android/androidcreatekeystorecertificate.cpp
index 8e1ff1ea2e2..555dd6de855 100644
--- a/src/plugins/android/androidcreatekeystorecertificate.cpp
+++ b/src/plugins/android/androidcreatekeystorecertificate.cpp
@@ -263,15 +263,17 @@ void AndroidCreateKeystoreCertificate::buttonBoxAccepted()
     if (!m_stateNameLineEdit->text().isEmpty())
         distinguishedNames += QLatin1String(", S=") + m_stateNameLineEdit->text().replace(',', QLatin1String("\\,"));
 
+    // clang-format off
     const CommandLine command(AndroidConfig::keytoolPath(),
                              {"-genkey", "-keyalg", "RSA",
-                              "-keystore",  m_keystoreFilePath.toString(),
+                              "-keystore",  m_keystoreFilePath.path(),
                               "-storepass", keystorePassword(),
                               "-alias", certificateAlias(),
                               "-keysize", m_keySizeSpinBox->text(),
                               "-validity", m_validitySpinBox->text(),
                               "-keypass", certificatePassword(),
                               "-dname", distinguishedNames});
+    // clang-format off
 
     Process genKeyCertProc;
     genKeyCertProc.setCommand(command);
diff --git a/src/plugins/android/androiddeployqtstep.cpp b/src/plugins/android/androiddeployqtstep.cpp
index 9882ece4dc6..f8551e7a971 100644
--- a/src/plugins/android/androiddeployqtstep.cpp
+++ b/src/plugins/android/androiddeployqtstep.cpp
@@ -308,7 +308,7 @@ bool AndroidDeployQtStep::init()
             AndroidManager::setManifestPath(target(),
                 FilePath::fromString(node->data(Constants::AndroidManifest).toString()));
         } else {
-            QString jsonFile = AndroidQtVersion::androidDeploymentSettings(target()).toString();
+            FilePath jsonFile = AndroidQtVersion::androidDeploymentSettings(target());
             if (jsonFile.isEmpty()) {
                 reportWarningOrError(Tr::tr("Cannot find the androiddeployqt input JSON file."),
                                      Task::Error);
@@ -323,10 +323,12 @@ bool AndroidDeployQtStep::init()
 
             m_workingDirectory = AndroidManager::androidBuildDirectory(target());
 
+            // clang-format off
             m_androiddeployqtArgs.addArgs({"--verbose",
-                                           "--output", m_workingDirectory.toString(),
+                                           "--output", m_workingDirectory.path(),
                                            "--no-build",
-                                           "--input", jsonFile});
+                                           "--input", jsonFile.path()});
+            // clang-format on
 
             m_androiddeployqtArgs.addArg("--gradle");
 
@@ -476,7 +478,7 @@ Group AndroidDeployQtStep::deployRecipe()
         } else {
             QTC_ASSERT(target()->activeRunConfiguration(), return SetupResult::StopWithError);
             cmd.addArgs(AndroidDeviceInfo::adbSelector(m_serialNumber));
-            cmd.addArgs({"install", "-r", m_apkPath.toString()});
+            cmd.addArgs({"install", "-r", m_apkPath.nativePath()});
         }
 
         process.setCommand(cmd);
diff --git a/src/plugins/android/androiddevice.cpp b/src/plugins/android/androiddevice.cpp
index 3fc78006edd..de164f03c49 100644
--- a/src/plugins/android/androiddevice.cpp
+++ b/src/plugins/android/androiddevice.cpp
@@ -761,7 +761,7 @@ static void handleAvdListChange(const AndroidDeviceInfoList &avdList)
             // of the device has changed, remove it and register it again with the new name.
             // Also account for the case of an AVD registered through old QC which might have
             // invalid data by checking if the avdPath is not empty.
-            if (dev->displayName() != displayName || androidDev->avdPath().toString().isEmpty()) {
+            if (dev->displayName() != displayName || androidDev->avdPath().isEmpty()) {
                 devMgr->removeDevice(dev->id());
             } else {
                 // Find the state of the AVD retrieved from the AVD watcher
@@ -907,7 +907,7 @@ void AndroidDeviceManagerInstance::setupDevicesWatcher()
 
     // Setup AVD filesystem watcher to listen for changes when an avd is created/deleted,
     // or started/stopped
-    m_avdFileSystemWatcher.addPath(avdFilePath().toString());
+    m_avdFileSystemWatcher.addPath(avdFilePath().toFSPathString());
     connect(&m_avdFileSystemWatcher, &QFileSystemWatcher::directoryChanged, this, [this] {
         if (!m_avdPathGuard.isLocked())
             AndroidDeviceManager::updateAvdList();
diff --git a/src/plugins/android/androidmanager.cpp b/src/plugins/android/androidmanager.cpp
index b50fd6887d3..d34dc453827 100644
--- a/src/plugins/android/androidmanager.cpp
+++ b/src/plugins/android/androidmanager.cpp
@@ -53,13 +53,16 @@ static Q_LOGGING_CATEGORY(androidManagerLog, "qtc.android.androidManager", QtWar
 
 static std::optional<QDomElement> documentElement(const FilePath &fileName)
 {
-    QFile file(fileName.toString());
-    if (!file.open(QIODevice::ReadOnly)) {
-        MessageManager::writeDisrupting(Tr::tr("Cannot open \"%1\".").arg(fileName.toUserOutput()));
+    const expected_str<QByteArray> result = fileName.fileContents();
+    if (!result) {
+        MessageManager::writeDisrupting(Tr::tr("Cannot open \"%1\".")
+                                            .arg(fileName.toUserOutput())
+                                            .append(' ')
+                                            .append(result.error()));
         return {};
     }
     QDomDocument doc;
-    if (!doc.setContent(file.readAll())) {
+    if (!doc.setContent(*result)) {
         MessageManager::writeDisrupting(Tr::tr("Cannot parse \"%1\".").arg(fileName.toUserOutput()));
         return {};
     }
@@ -183,8 +186,8 @@ int minimumSDK(const Kit *kit)
     int minSdkVersion = -1;
     QtSupport::QtVersion *version = QtSupport::QtKitAspect::qtVersion(kit);
     if (version && version->targetDeviceTypes().contains(Constants::ANDROID_DEVICE_TYPE)) {
-        const FilePath stockManifestFilePath = FilePath::fromUserInput(
-            version->prefix().toString() + "/src/android/templates/AndroidManifest.xml");
+        const FilePath stockManifestFilePath = version->prefix().pathAppended(
+            "src/android/templates/AndroidManifest.xml");
 
         const auto element = documentElement(stockManifestFilePath);
         if (element)
@@ -236,19 +239,18 @@ QJsonObject deploymentSettings(const Target *target)
         return {};
     QJsonObject settings;
     settings["_description"] = qtcSignature;
-    settings["qt"] = qt->prefix().toString();
-    settings["ndk"] = AndroidConfig::ndkLocation(qt).toString();
-    settings["sdk"] = AndroidConfig::sdkLocation().toString();
+    settings["qt"] = qt->prefix().toFSPathString();
+    settings["ndk"] = AndroidConfig::ndkLocation(qt).toFSPathString();
+    settings["sdk"] = AndroidConfig::sdkLocation().toFSPathString();
     if (!qt->supportsMultipleQtAbis()) {
         const QStringList abis = applicationAbis(target);
         QTC_ASSERT(abis.size() == 1, return {});
-        settings["stdcpp-path"] = (AndroidConfig::toolchainPath(qt)
-                                      / "sysroot/usr/lib"
-                                      / archTriplet(abis.first())
-                                      / "libc++_shared.so").toString();
+        settings["stdcpp-path"] = (AndroidConfig::toolchainPath(qt) / "sysroot/usr/lib"
+                                   / archTriplet(abis.first()) / "libc++_shared.so")
+                                      .toFSPathString();
     } else {
         settings["stdcpp-path"]
-            = AndroidConfig::toolchainPath(qt).pathAppended("sysroot/usr/lib").toString();
+            = AndroidConfig::toolchainPath(qt).pathAppended("sysroot/usr/lib").toFSPathString();
     }
     settings["toolchain-prefix"] =  "llvm";
     settings["tool-prefix"] = "llvm";
@@ -259,10 +261,10 @@ QJsonObject deploymentSettings(const Target *target)
 
 bool isQtCreatorGenerated(const FilePath &deploymentFile)
 {
-    QFile f{deploymentFile.toString()};
-    if (!f.open(QIODevice::ReadOnly))
+    const expected_str<QByteArray> result = deploymentFile.fileContents();
+    if (!result)
         return false;
-    return QJsonDocument::fromJson(f.readAll()).object()["_description"].toString() == qtcSignature;
+    return QJsonDocument::fromJson(*result).object()["_description"].toString() == qtcSignature;
 }
 
 FilePath androidBuildDirectory(const Target *target)
diff --git a/src/plugins/android/androidmanifesteditoriconwidget.cpp b/src/plugins/android/androidmanifesteditoriconwidget.cpp
index fd0935a7b02..5e2b7ae095c 100644
--- a/src/plugins/android/androidmanifesteditoriconwidget.cpp
+++ b/src/plugins/android/androidmanifesteditoriconwidget.cpp
@@ -121,7 +121,7 @@ void AndroidManifestEditorIconWidget::setIconFromPath(const FilePath &iconPath)
         return;
     m_iconPath = iconPath;
     FilePath baseDir = manifestDir(m_textEditorWidget);
-    QImage original(iconPath.toString());
+    QImage original(iconPath.toFSPathString());
     if (!original.isNull() && m_scaledToOriginalAspectRatio) {
         if ((original.width() > original.height() && m_buttonSize.height() > m_buttonSize.width())
                 || (original.height() > original.width() && m_buttonSize.width() > m_buttonSize.height())) {
@@ -138,7 +138,7 @@ void AndroidManifestEditorIconWidget::setIconFromPath(const FilePath &iconPath)
     }
     copyIcon();
     FilePath iconFile = baseDir / m_targetIconPath / m_targetIconFileName;
-    m_button->setIcon(QIcon(iconFile.toString()));
+    m_button->setIcon(QIcon(iconFile.toFSPathString()));
 }
 
 void AndroidManifestEditorIconWidget::selectIcon()
@@ -254,7 +254,7 @@ void AndroidManifestEditorIconWidget::copyIcon()
         qCDebug(androidManifestEditorLog) << "Icon target path empty, cannot copy icon.";
         return;
     }
-    QImage original(m_iconPath.toString());
+    QImage original(m_iconPath.toFSPathString());
     if (m_iconPath != targetPath)
         removeIcon();
     if (original.isNull()) {
@@ -277,7 +277,7 @@ void AndroidManifestEditorIconWidget::copyIcon()
         else
             scaled = scaleWithoutStretching(original, m_iconSize);
         setScaleWarningLabelVisible(scaled.width() > original.width() || scaled.height() > original.height());
-        scaled.save(targetPath.toString());
+        scaled.save(targetPath.toFSPathString());
         m_iconPath = targetPath;
     } else {
         m_iconPath.clear();
diff --git a/src/plugins/android/androidpackageinstallationstep.cpp b/src/plugins/android/androidpackageinstallationstep.cpp
index 8f1d4b01d57..3c8621d4d4a 100644
--- a/src/plugins/android/androidpackageinstallationstep.cpp
+++ b/src/plugins/android/androidpackageinstallationstep.cpp
@@ -103,7 +103,7 @@ bool AndroidPackageInstallationStep::init()
 
 QString AndroidPackageInstallationStep::nativeAndroidBuildPath() const
 {
-    QString buildPath = AndroidManager::androidBuildDirectory(target()).toString();
+    QString buildPath = AndroidManager::androidBuildDirectory(target()).toFSPathString();
     if (HostOsInfo::isWindowsHost())
         if (buildEnvironment().searchInPath("sh.exe").isEmpty())
             buildPath = QDir::toNativeSeparators(buildPath);
diff --git a/src/plugins/android/androidrunnerworker.cpp b/src/plugins/android/androidrunnerworker.cpp
index aefe2ba351d..0b1f9e4d518 100644
--- a/src/plugins/android/androidrunnerworker.cpp
+++ b/src/plugins/android/androidrunnerworker.cpp
@@ -659,8 +659,8 @@ static ExecutableItem uploadDebugServerRecipe(RunnerStorage *storage, const QStr
     };
 
     const auto onServerUploadSetup = [storage, tempDebugServerPathStorage](Process &process) {
-        process.setCommand(
-            storage->adbCommand({"push", storage->m_debugServerPath.toString(), *tempDebugServerPathStorage}));
+        process.setCommand(storage->adbCommand(
+            {"push", storage->m_debugServerPath.path(), *tempDebugServerPathStorage}));
     };
 
     const auto onServerCopySetup = [storage, tempDebugServerPathStorage, debugServerFileName](Process &process) {
diff --git a/src/plugins/android/androidsdkdownloader.cpp b/src/plugins/android/androidsdkdownloader.cpp
index 8f0993363e0..e8a51d1299f 100644
--- a/src/plugins/android/androidsdkdownloader.cpp
+++ b/src/plugins/android/androidsdkdownloader.cpp
@@ -65,22 +65,23 @@ static FilePath sdkFromUrl(const QUrl &url)
 // TODO: Make it a separate async task in a chain?
 static std::optional<QString> saveToDisk(const FilePath &filename, QIODevice *data)
 {
-    QFile file(filename.toString());
-    if (!file.open(QIODevice::WriteOnly)) {
+    const expected_str<qint64> result = filename.writeFileContents(data->readAll());
+    if (!result) {
         return Tr::tr("Could not open \"%1\" for writing: %2.")
-            .arg(filename.toUserOutput(), file.errorString());
+            .arg(filename.toUserOutput(), result.error());
     }
-    file.write(data->readAll());
+
     return {};
 }
 
 static void validateFileIntegrity(QPromise<void> &promise, const FilePath &fileName,
                                   const QByteArray &sha256)
 {
-    QFile file(fileName.toString());
-    if (file.open(QFile::ReadOnly)) {
+    const expected_str<QByteArray> result = fileName.fileContents();
+    if (result) {
         QCryptographicHash hash(QCryptographicHash::Sha256);
-        if (hash.addData(&file) && hash.result() == sha256)
+        hash.addData(*result);
+        if (hash.result() == sha256)
             return;
     }
     promise.future().cancel();
diff --git a/src/plugins/android/androidsdkmanager.cpp b/src/plugins/android/androidsdkmanager.cpp
index be9bd06e763..1a7db4ea49f 100644
--- a/src/plugins/android/androidsdkmanager.cpp
+++ b/src/plugins/android/androidsdkmanager.cpp
@@ -115,7 +115,7 @@ private:
 
 static QString sdkRootArg()
 {
-    return "--sdk_root=" + AndroidConfig::sdkLocation().toString();
+    return "--sdk_root=" + AndroidConfig::sdkLocation().path();
 }
 
 const QRegularExpression &assertionRegExp()
diff --git a/src/plugins/android/androidsdkmanagerdialog.cpp b/src/plugins/android/androidsdkmanagerdialog.cpp
index 8ae1cfd77b5..c4c7da5755b 100644
--- a/src/plugins/android/androidsdkmanagerdialog.cpp
+++ b/src/plugins/android/androidsdkmanagerdialog.cpp
@@ -41,8 +41,9 @@ public:
         m_argumentDetailsEdit->setReadOnly(true);
 
         m_process.setEnvironment(AndroidConfig::toolsEnvironment());
-        m_process.setCommand({AndroidConfig::sdkManagerToolPath(),
-                              {"--help", "--sdk_root=" + AndroidConfig::sdkLocation().toString()}});
+        m_process.setCommand(
+            {AndroidConfig::sdkManagerToolPath(),
+             {"--help", "--sdk_root=" + AndroidConfig::sdkLocation().path()}});
         connect(&m_process, &Process::done, this, [this] {
             const QString output = m_process.allOutput();
             QString argumentDetails;
diff --git a/src/plugins/android/androidsettingswidget.cpp b/src/plugins/android/androidsettingswidget.cpp
index cdfdd5c029a..cdc80f91e9d 100644
--- a/src/plugins/android/androidsettingswidget.cpp
+++ b/src/plugins/android/androidsettingswidget.cpp
@@ -711,16 +711,14 @@ void AndroidSettingsWidget::downloadOpenSslRepo(const bool silent)
         return;
     }
 
-    QDir openSslDir(openSslPath.toString());
-    const bool isEmptyDir = openSslDir.isEmpty(QDir::AllEntries | QDir::NoDotAndDotDot
-                                               | QDir::Hidden | QDir::System);
-    if (openSslDir.exists() && !isEmptyDir) {
+    if (openSslPath.exists() && !openSslPath.isEmpty()) {
         QMessageBox::information(
             this,
             openSslCloneTitle,
-            Tr::tr("The selected download path (%1) for OpenSSL already exists and the directory is "
-                   "not empty. Select a different path or make sure it is an empty directory.")
-            .arg(QDir::toNativeSeparators(openSslPath.toString())));
+            Tr::tr(
+                "The selected download path (%1) for OpenSSL already exists and the directory is "
+                "not empty. Select a different path or make sure it is an empty directory.")
+                .arg(openSslPath.toUserOutput()));
         return;
     }
 
@@ -733,8 +731,8 @@ void AndroidSettingsWidget::downloadOpenSslRepo(const bool silent)
 
     const QString openSslRepo("https://github.com/KDAB/android_openssl.git");
     Process *gitCloner = new Process(this);
-    const CommandLine gitCloneCommand("git", {"clone", "--depth=1", openSslRepo,
-                                              openSslPath.toString()});
+    const CommandLine
+        gitCloneCommand("git", {"clone", "--depth=1", openSslRepo, openSslPath.path()});
     gitCloner->setCommand(gitCloneCommand);
 
     qCDebug(androidsettingswidget) << "Cloning OpenSSL repo: " << gitCloneCommand.toUserOutput();
diff --git a/src/plugins/android/androidtoolchain.cpp b/src/plugins/android/androidtoolchain.cpp
index 02da5692eff..ede99938e25 100644
--- a/src/plugins/android/androidtoolchain.cpp
+++ b/src/plugins/android/androidtoolchain.cpp
@@ -68,7 +68,7 @@ AndroidToolchain::~AndroidToolchain() = default;
 bool AndroidToolchain::isValid() const
 {
     if (m_ndkLocation.isEmpty()) {
-        QStringList ndkParts(compilerCommand().toString().split("toolchains/llvm/prebuilt/"));
+        QStringList ndkParts(compilerCommand().toFSPathString().split("toolchains/llvm/prebuilt/"));
         if (ndkParts.size() > 1) {
             QString ndkLocation(ndkParts.first());
             if (ndkLocation.endsWith('/'))
diff --git a/src/plugins/android/avdmanageroutputparser.cpp b/src/plugins/android/avdmanageroutputparser.cpp
index 7a91b99f19d..8309fee7810 100644
--- a/src/plugins/android/avdmanageroutputparser.cpp
+++ b/src/plugins/android/avdmanageroutputparser.cpp
@@ -60,7 +60,7 @@ static std::optional<AndroidDeviceInfo> parseAvd(const QStringList &deviceInfo)
             if (avdPath.exists()) {
                 // Get ABI.
                 const Utils::FilePath configFile = avdPath.pathAppended("config.ini");
-                QSettings config(configFile.toString(), QSettings::IniFormat);
+                QSettings config(configFile.toFSPathString(), QSettings::IniFormat);
                 value = config.value(avdInfoAbiKey).toString();
                 if (!value.isEmpty())
                     avd.cpuAbi << value;
@@ -71,13 +71,13 @@ static std::optional<AndroidDeviceInfo> parseAvd(const QStringList &deviceInfo)
                 const QString avdInfoFileName = avd.avdName + ".ini";
                 const Utils::FilePath avdInfoFile = avdPath.parentDir().pathAppended(
                     avdInfoFileName);
-                QSettings avdInfo(avdInfoFile.toString(), QSettings::IniFormat);
+                QSettings avdInfo(avdInfoFile.toFSPathString(), QSettings::IniFormat);
                 value = avdInfo.value(avdInfoTargetKey).toString();
                 if (!value.isEmpty())
                     avd.sdk = platformNameToApiLevel(value);
                 else
                     qCDebug(avdOutputParserLog)
-                        << "Avd Parsing: Cannot find sdk API:" << avdInfoFile.toString();
+                        << "Avd Parsing: Cannot find sdk API:" << avdInfoFile.toUserOutput();
             }
         }
     }
diff --git a/src/plugins/android/createandroidmanifestwizard.cpp b/src/plugins/android/createandroidmanifestwizard.cpp
index 8d2226f3790..60423c9d4a0 100644
--- a/src/plugins/android/createandroidmanifestwizard.cpp
+++ b/src/plugins/android/createandroidmanifestwizard.cpp
@@ -306,9 +306,9 @@ void CreateAndroidManifestWizard::createAndroidTemplateFiles()
         if (androidPackageDir.isEmpty()) {
             // and now time for some magic
             const BuildTargetInfo bti = target->buildTarget(m_buildKey);
-            const QString value = "$$PWD/"
-                                  + bti.projectFilePath.toFileInfo().absoluteDir().relativeFilePath(
-                                      m_directory.toString());
+            const QString value
+                = "$$PWD/"
+                  + bti.projectFilePath.absoluteFilePath().relativePathFrom(m_directory).path();
             bool result = node->setData(Android::Constants::AndroidPackageSourceDir, value);
 
             if (!result) {
diff --git a/src/plugins/android/javalanguageserver.cpp b/src/plugins/android/javalanguageserver.cpp
index 90d536dcaef..c4bfd9bfd6d 100644
--- a/src/plugins/android/javalanguageserver.cpp
+++ b/src/plugins/android/javalanguageserver.cpp
@@ -120,7 +120,7 @@ bool JLSSettings::applyFromSettingsWidget(QWidget *widget)
             configDir.cd("config_mac");
     }
     if (configDir.exists()) {
-        arguments = arguments.arg(m_languageServer.toString(), configDir.absolutePath());
+        arguments = arguments.arg(m_languageServer.path(), configDir.absolutePath());
         changed |= m_arguments != arguments;
         m_arguments = arguments;
     }
@@ -219,7 +219,7 @@ static void generateProjectFile(const FilePath &projectDir,
                                 const QString &projectName)
 {
     const FilePath projectFilePath = projectDir.pathAppended(".project");
-    QFile projectFile(projectFilePath.toString());
+    QFile projectFile(projectFilePath.toFSPathString());
     if (projectFile.open(QFile::Truncate | QFile::WriteOnly)) {
         QXmlStreamWriter writer(&projectFile);
         writer.setAutoFormatting(true);
@@ -249,7 +249,7 @@ static void generateClassPathFile(const FilePath &projectDir,
                                   const FilePaths &libs)
 {
     const FilePath classPathFilePath = projectDir.pathAppended(".classpath");
-    QFile classPathFile(classPathFilePath.toString());
+    QFile classPathFile(classPathFilePath.toFSPathString());
     if (classPathFile.open(QFile::Truncate | QFile::WriteOnly)) {
         QXmlStreamWriter writer(&classPathFile);
         writer.setAutoFormatting(true);
@@ -259,14 +259,14 @@ static void generateClassPathFile(const FilePath &projectDir,
         writer.writeStartElement("classpath");
         writer.writeEmptyElement("classpathentry");
         writer.writeAttribute("kind", "src");
-        writer.writeAttribute("path", sourceDir.toString());
+        writer.writeAttribute("path", sourceDir.toUserOutput());
         writer.writeEmptyElement("classpathentry");
         writer.writeAttribute("kind", "src");
         writer.writeAttribute("path", "qtSrc");
         for (const FilePath &lib : libs) {
             writer.writeEmptyElement("classpathentry");
             writer.writeAttribute("kind", "lib");
-            writer.writeAttribute("path", lib.toString());
+            writer.writeAttribute("path", lib.toUserOutput());
         }
         writer.writeEndElement(); // classpath
         writer.writeEndDocument();
@@ -286,7 +286,7 @@ void JLSClient::updateProjectFiles()
             QtSupport::QtVersion *version = QtSupport::QtKitAspect::qtVersion(kit);
             if (!version)
                 return;
-            const QString qtSrc = version->prefix().toString() + "/src/android/java/src";
+            const FilePath qtSrc = version->prefix().pathAppended("src/android/java/src");
             const FilePath &projectDir = project()->rootProjectDirectory();
             if (!projectDir.exists())
                 return;
@@ -315,7 +315,7 @@ void JLSClient::updateProjectFiles()
             for (const QString &path : classPaths)
                 libs << FilePath::fromString(path);
 
-            generateProjectFile(projectDir, qtSrc, project()->displayName());
+            generateProjectFile(projectDir, qtSrc.path(), project()->displayName());
             generateClassPathFile(projectDir, sourceDir, libs);
         }
     }
diff --git a/src/plugins/android/javaparser.cpp b/src/plugins/android/javaparser.cpp
index 65ddfba9ad6..a6b6146f1d2 100644
--- a/src/plugins/android/javaparser.cpp
+++ b/src/plugins/android/javaparser.cpp
@@ -47,11 +47,11 @@ OutputLineParser::Result JavaParser::handleLine(const QString &line, OutputForma
     FilePath file = FilePath::fromUserInput(match.captured(2));
     if (file.isChildOf(m_buildDirectory)) {
         FilePath relativePath = file.relativeChildPath(m_buildDirectory);
-        file = m_sourceDirectory.pathAppended(relativePath.toString());
+        file = m_sourceDirectory.resolvePath(relativePath);
     }
     if (file.toFileInfo().isRelative()) {
         for (int i = 0; i < m_fileList.size(); i++)
-            if (m_fileList[i].endsWith(file.toString())) {
+            if (m_fileList[i].endsWith(file.path())) {
                 file = m_fileList[i];
                 break;
             }
diff --git a/src/plugins/android/splashscreencontainerwidget.cpp b/src/plugins/android/splashscreencontainerwidget.cpp
index 351fcd1a448..22ea3a1738d 100644
--- a/src/plugins/android/splashscreencontainerwidget.cpp
+++ b/src/plugins/android/splashscreencontainerwidget.cpp
@@ -225,7 +225,7 @@ void SplashScreenWidget::setImageFromPath(const FilePath &imagePath, bool resize
         qCDebug(androidManifestEditorLog) << "Image target path is empty, cannot set image.";
         return;
     }
-    QImage image = QImage(imagePath.toString());
+    QImage image = QImage(imagePath.toFSPathString());
     if (image.isNull()) {
         qCDebug(androidManifestEditorLog) << "Image '" << imagePath << "' not found or invalid format.";
         return;
@@ -239,7 +239,7 @@ void SplashScreenWidget::setImageFromPath(const FilePath &imagePath, bool resize
                                  (float(image.height()) / float(m_maxScalingRatio)) * float(m_scalingRatio));
         image = image.scaled(size);
     }
-    QFile file(targetPath.toString());
+    QFile file(targetPath.toFSPathString());
     if (file.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
         image.save(&file, "PNG");
         file.close();
@@ -296,7 +296,7 @@ void SplashScreenWidget::loadImage()
         qCDebug(androidManifestEditorLog) << "Image target path empty, cannot load image.";
         return;
     }
-    QImage image = QImage(targetPath.toString());
+    QImage image = QImage(targetPath.toFSPathString());
     if (image.isNull()) {
         qCDebug(androidManifestEditorLog).noquote()
                 << "Cannot load image." << targetPath.toUserOutput();
@@ -655,7 +655,7 @@ void SplashScreenContainerWidget::loadImages()
 void SplashScreenContainerWidget::loadSplashscreenDrawParams(const QString &name)
 {
     const FilePath filePath = manifestDir(m_textEditorWidget).pathAppended("res/drawable/" + name + ".xml");
-    QFile file(filePath.toString());
+    QFile file(filePath.toFSPathString());
     if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
         QXmlStreamReader reader(&file);
         reader.setNamespaceProcessing(false);
@@ -773,13 +773,13 @@ void SplashScreenContainerWidget::setImageShowMode(const QString &mode)
 
 void SplashScreenContainerWidget::createSplashscreenThemes()
 {
-    const QString baseDir = manifestDir(m_textEditorWidget).toString();
-    const QStringList splashscreenThemeFiles = {"/res/values/splashscreentheme.xml",
-                                                "/res/values-port/splashscreentheme.xml",
-                                                "/res/values-land/splashscreentheme.xml"};
-    const QStringList splashscreenDrawableFiles = {QString("/res/drawable/%1.xml").arg(splashscreenName),
-                                                   QString("/res/drawable/%1.xml").arg(splashscreenPortraitName),
-                                                   QString("/res/drawable/%1.xml").arg(splashscreenLandscapeName)};
+    const FilePath baseDir = manifestDir(m_textEditorWidget);
+    const QStringList splashscreenThemeFiles = {"res/values/splashscreentheme.xml",
+                                                "res/values-port/splashscreentheme.xml",
+                                                "res/values-land/splashscreentheme.xml"};
+    const QStringList splashscreenDrawableFiles = {QString("res/drawable/%1.xml").arg(splashscreenName),
+                                                   QString("res/drawable/%1.xml").arg(splashscreenPortraitName),
+                                                   QString("res/drawable/%1.xml").arg(splashscreenLandscapeName)};
     QStringList splashscreens[3];
 
     if (hasImages())
@@ -790,9 +790,11 @@ void SplashScreenContainerWidget::createSplashscreenThemes()
         splashscreens[2] << splashscreenLandscapeName << splashscreenLandscapeFileName;
 
     for (int i = 0; i < 3; i++) {
+        const FilePath splashscreenThemeFile = baseDir.pathAppended(splashscreenThemeFiles[i]);
+        const FilePath splashscreenDrawableFile = baseDir.pathAppended(splashscreenDrawableFiles[i]);
         if (!splashscreens[i].isEmpty()) {
             QDir dir;
-            QFile themeFile(baseDir + splashscreenThemeFiles[i]);
+            QFile themeFile(splashscreenThemeFile.toFSPathString());
             dir.mkpath(QFileInfo(themeFile).absolutePath());
             if (themeFile.open(QFile::WriteOnly | QFile::Truncate)) {
                 QXmlStreamWriter stream(&themeFile);
@@ -810,7 +812,7 @@ void SplashScreenContainerWidget::createSplashscreenThemes()
                 stream.writeEndDocument();
                 themeFile.close();
             }
-            QFile drawableFile(baseDir + splashscreenDrawableFiles[i]);
+            QFile drawableFile(splashscreenDrawableFile.toFSPathString());
             dir.mkpath(QFileInfo(drawableFile).absolutePath());
             if (drawableFile.open(QFile::WriteOnly | QFile::Truncate)) {
                 QXmlStreamWriter stream(&drawableFile);
@@ -836,8 +838,8 @@ void SplashScreenContainerWidget::createSplashscreenThemes()
             }
         }
         else {
-            QFile::remove(baseDir + splashscreenThemeFiles[i]);
-            QFile::remove(baseDir + splashscreenDrawableFiles[i]);
+            QFile::remove(splashscreenThemeFile.toFSPathString());
+            QFile::remove(splashscreenDrawableFile.toFSPathString());
         }
     }
 }