簡介

基于上篇 [Qt for android 獲取USB設備列表（一）Java方式 獲取]， 這篇就純粹多了， 直接將上篇代碼轉換成JNI方式即可。即所有的設備連接與上篇一致。 (https://listentome.blog.csdn.net/article/details/139205850)

關鍵代碼

void MainWindow::getDeviceList()
{QJniObject usbService = QJniObject::getStaticObjectField("android/content/Context","USB_SERVICE","Ljava/lang/String;");if (!usbService.isValid()){logger("fail to get usb service");return;}QJniObject activity = QJniObject(QNativeInterface::QAndroidApplication::context());QJniObject usbManager = activity.callObjectMethod("getSystemService","(Ljava/lang/String;)Ljava/lang/Object;",usbService.object<jstring>());if (!usbManager.isValid()){logger("fail to get usb manager");return;}QJniObject usbDeviceListHashMap = usbManager.callObjectMethod("getDeviceList","()Ljava/util/HashMap;");QJniObject devListKeySet = usbDeviceListHashMap.callObjectMethod("keySet","()Ljava/util/Set;");QJniObject devListIter = devListKeySet.callObjectMethod("iterator","()Ljava/util/Iterator;");jint devListSize = usbDeviceListHashMap.callMethod<jint>("size", "()I");QJniObject usbDevObj;QJniObject usbDevObjIter;int vid = 0, pid = 0;QString devName;for (int i = 0; i < devListSize; ++i){usbDevObjIter = devListIter.callObjectMethod("next","()Ljava/lang/Object;");usbDevObj = usbDeviceListHashMap.callObjectMethod("get","(Ljava/lang/Object;)Ljava/lang/Object;",usbDevObjIter.object());vid = usbDevObj.callMethod<jint>("getVendorId", "()I");pid = usbDevObj.callMethod<jint>("getProductId", "()I");devName = usbDevObj.callMethod<jstring>("getDeviceName", "()Ljava/lang/String;").toString();logger(QString("Name: %1, VID: %2, PID: %3").arg(devName).arg(vid).arg(pid));}}

展示

其他

Qt for android 獲取USB設備列表（一）Java方式 獲取