AndroidTestRunner: check if any device is running at start

Check if any or specified device is running and fail with
appropriate message instead of attempting to run other adb
commands that might fail with other reasons that hide the
actual root cause.

Pick-to: 6.8
Change-Id: I61078ca988f381e834b41140e36b0e4a5f77714f
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>

src/tools/androidtestrunner/main.cpp

@@ -509,6 +509,20 @@ static void obtainSdkVersion()
         qCritical() << "Unable to obtain the SDK version of the target.";
 }
 
+static QStringList runningDevices()
+{
+    QByteArray output;
+    execAdbCommand({ "devices"_L1 }, &output, false);
+
+    QStringList devices;
+    for (const QByteArray &line : output.split(u'\n')) {
+        if (line.contains("\tdevice"_L1))
+            devices.append(QString::fromUtf8(line.split(u'\t').first()));
+    }
+
+    return devices;
+}
+
 static bool pullFiles()
 {
     bool ret = true;
@@ -755,6 +769,16 @@ int main(int argc, char *argv[])
         return 1;
     }
 
+    const QStringList devices = runningDevices();
+    if (devices.isEmpty()) {
+        qCritical("No connected devices or running emulators can be found.");
+        return 1;
+    } else if (!g_options.serial.isEmpty() && !devices.contains(g_options.serial)) {
+        qCritical("No connected device or running emulator with serial '%s' can be found.",
+                  qPrintable(g_options.serial));
+        return 1;
+    }
+
     obtainSdkVersion();
 
     QString manifest = g_options.buildPath + "/AndroidManifest.xml"_L1;