Camera not switching to active state in qt6 android

[iSolve_Tech]

I CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_OPEN for client no.ablecon.ablemobile API Level 2 User Id 0
I CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_CLOSED for client no.ablecon.ablemobile API Level 2 User Id 0
I CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_OPENING for client no.ablecon.ablemobile API Level 2 User Id 0
D AbleCenter: isActive false
D AbleCenter: isAvailable true why the camera is not switching to active state

[SGaist]

Hi,

You should give more information:

• Exact Qt version
• Exact Androïd version
• Device in use

[iSolve_Tech]

@SGaist Qt Version: 6.5.3, Android version: 13, 14, Device: Samsung, Poco, the same code is working for iOS, Windows & particularly on android it's not working.

For your reference am giving the log here

I CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_CLOSED for client no.ablecon.ablemobile API Level 2 User Id 0
I CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_OPENING for client no.ablecon.ablemobile API Level 2 User Id 0
I CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_OPEN for client no.ablecon.ablemobile API Level 2 User Id 0

The camera state is not switching to active why?

[jack_study_qt]

@iSolve_Tech Because Android requires permissions, you need to address the permission issue to access the camera. The problem I am currently trying to solve is the recording file saving issue.

[iSolve_Tech]

@jack_study_qt Camera permission & Write external storage permission already there & am asking run time permission. The same code which is working for windows & iOS

[jack_study_qt]

@iSolve_Tech If you try setting it up on your phone, you'll notice it's not there; that part requires dynamic requests. Try setting it up directly on your phone without writing any code.

[jack_study_qt]

@iSolve_Tech I'll show you the permissions necessary for running on Android later

[jack_study_qt]

@iSolve_Tech <uses-feature android:name="android.hardware.camera" android:required="true"/>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MANAGE_DOCUMENTS"/>
<uses-permission android:name="android.permission.CAMERA" /> ui->setupUi(this);

labDuration=new QLabel("录制时间: ");
labDuration->setMinimumWidth(120);
ui->statusBar->addWidget(labDuration);

labFormatInfo=new QLabel("图片分辨率: ");
labFormatInfo->setMinimumWidth(150);
ui->statusBar->addWidget(labFormatInfo);

labInfo=new QLabel("信息");
ui->statusBar->addPermanentWidget(labInfo);

//1. 发现摄像头
QCameraDevice defaultCameraDevice= QMediaDevices::defaultVideoInput();
if (defaultCameraDevice.isNull())
{
QMessageBox::critical(this,"提示","没有发现摄像头");
return;
}
QByteArray defaultCameraID=defaultCameraDevice.id();
ui->actStartCamera->setEnabled(true);

// disconnect(ui->comboCam_List); //解除与comboCam_List连接的所有槽函数
int index=0;
for(int i=0; i<QMediaDevices::videoInputs().size(); i++)
{
QCameraDevice device=QMediaDevices::videoInputs().at(i);
if (device.id() == defaultCameraID)
{
ui->comboCam_List->addItem(device.description()+"(默认)",QVariant::fromValue(device));
index=i;
}
else
ui->comboCam_List->addItem(device.description(),QVariant::fromValue(device));
}

if (ui->comboCam_List->currentIndex() != index)
    ui->comboCam_List->setCurrentIndex(index);

// foreach(QCameraDevice device, QMediaDevices::videoInputs())
// {
// if (device.isDefault()) //是默认设备
// ui->comboCam_List->addItem(device.description()+"(默认)",QVariant::fromValue(device));
// else
// ui->comboCam_List->addItem(device.description(),QVariant::fromValue(device));
// }

// ui->comboCam_List->addItem(cameraDevice.description());
// showCameraDeviceInfo(&cameraDevice);

// ui->comboCam_List->addItem(cameraDevice.description());

//2. 创建抓取管理器session和各个设备
session = new QMediaCaptureSession(this); //抓取管理器
session->setVideoOutput(ui->videoPreview); //设置视频输出组件，用于视频预览
//2.1 创建QAudioInput对象，用用音频输入
QAudioInput *audioInput=new QAudioInput(this);
audioInput->setDevice(QMediaDevices::defaultAudioInput());
session->setAudioInput(audioInput); //设置音频输入设备

//2.2 创建QCamera对象,用于控制摄像头
camera = new QCamera(this); //摄像头
camera->setCameraDevice(defaultCameraDevice); //
session->setCamera(camera); //为session设置摄像头
connect(camera, &QCamera::activeChanged,this, &MainWindow::do_camera_activeChanged);
connect(ui->comboCam_List,&QComboBox::currentIndexChanged,
this, &MainWindow::do_camera_changed);
do_camera_changed(ui->comboCam_List->currentIndex());

//2.3 创建QImageCapture对象,用于拍照
imageCapture = new QImageCapture(this); //抓图器
imageCapture->setQuality(QImageCapture::VeryHighQuality);
session->setImageCapture(imageCapture); //为session设置抓图器
connect(imageCapture,&QImageCapture::readyForCaptureChanged,
this, &MainWindow::do_image_readyForCapture);
connect(imageCapture,&QImageCapture::imageCaptured,
this,&MainWindow::do_image_captured);
connect(imageCapture, &QImageCapture::imageSaved,
this, &MainWindow::do_image_saved);

soundEffect =new QSoundEffect(this);     //用于播放音效，拍照时的快门声音
QString filename=":/sound/images/shutter.wav";
soundEffect->setSource(QUrl::fromLocalFile(filename));

//2.4 创建QMediaRecorder对象，用于录制视频
recorder = new QMediaRecorder(this); //创建recorder
session->setRecorder(recorder); //为session设置recorder
connect(recorder, &QMediaRecorder::durationChanged,
this, &MainWindow::do_recorder_duration);
connect(recorder, &QMediaRecorder::recorderStateChanged,
this, &MainWindow::do_recorder_stateChanged);
connect(recorder, &QMediaRecorder::errorOccurred,
this, &MainWindow::do_recorder_error);

//3. 视频编码和文件格式，添加到录像设置的下拉列表框里，用于选择
QMediaFormat format;
foreach(QMediaFormat::VideoCodec codec, format.supportedVideoCodecs(QMediaFormat::Encode))
ui->comboVideo_Codec->addItem(QMediaFormat::videoCodecDescription(codec),
QVariant::fromValue(codec));
foreach(QMediaFormat::FileFormat fileFormat, format.supportedFileFormats(QMediaFormat::Encode))
ui->comboVideo_FileFormat->addItem(QMediaFormat::fileFormatDescription(fileFormat),
QVariant::fromValue(fileFormat));

[jack_study_qt]

@iSolve_Tech The real challenge of your program is how to save video recordings on Android. Opening the camera is not an issue! I couldn't find any usable QT6 APIs for this purpose, so in the end, I had to resort to calling the native Android API to allow users to specify the destination and file name for saving!