radio.cpp Example File
radio/radio.cpp

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    #include "radio.h"

    #include <QtGui>

    Radio::Radio()
    {
        radio = new QRadioTuner;
        connect(radio,SIGNAL(frequencyChanged(int)),this,SLOT(freqChanged(int)));
        connect(radio,SIGNAL(signalStrengthChanged(int)),this,SLOT(signalChanged(int)));

        if(radio->isBandSupported(QRadioTuner::FM))
            radio->setBand(QRadioTuner::FM);

        QWidget *window = new QWidget;
        QVBoxLayout* layout = new QVBoxLayout;
        QHBoxLayout* buttonBar = new QHBoxLayout;
    #if defined Q_OS_SYMBIAN // this is so that we can see all buttons also in 3.1 devices, where the screens are smaller..
        QHBoxLayout* buttonBar2 = new QHBoxLayout;
    #endif
        QHBoxLayout* topBar = new QHBoxLayout;

        layout->addLayout(topBar);

        freq = new QLabel;
        freq->setText(QString("%1 kHz").arg(radio->frequency()/1000));
        topBar->addWidget(freq);

        signal = new QLabel;
        if (radio->isAvailable())
            signal->setText(tr("No Signal"));
        else
            signal->setText(tr("No radio found"));
        topBar->addWidget(signal);
    #if defined Q_WS_MAEMO_5
        QSpacerItem *spacer = new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Minimum);
        topBar->addItem(spacer);
        volumeSlider = new QSlider(Qt::Horizontal,this);
    #else
        volumeSlider = new QSlider(Qt::Vertical,this);
    #endif
        volumeSlider->setRange(0,100);
        volumeSlider->setValue(50);
        connect(volumeSlider,SIGNAL(valueChanged(int)),this,SLOT(updateVolume(int)));
        topBar->addWidget(volumeSlider);

        layout->addLayout(buttonBar);
    #if defined Q_OS_SYMBIAN
        layout->addLayout(buttonBar2);
    #endif

        searchLeft = new QPushButton;
        searchLeft->setText(tr("scan Down"));
        connect(searchLeft,SIGNAL(clicked()),SLOT(searchDown()));
        buttonBar->addWidget(searchLeft);

        left = new QPushButton;
        left->setText(tr("Freq Down"));
        connect(left,SIGNAL(clicked()),SLOT(freqDown()));
    #if defined Q_OS_SYMBIAN
        buttonBar2->addWidget(left);
    #else
        buttonBar->addWidget(left);
    #endif

        right = new QPushButton;
        connect(right,SIGNAL(clicked()),SLOT(freqUp()));
        right->setText(tr("Freq Up"));
    #if defined Q_OS_SYMBIAN
        buttonBar2->addWidget(right);
    #else
        buttonBar->addWidget(right);
    #endif

        searchRight = new QPushButton;
        searchRight->setText(tr("scan Up"));
        connect(searchRight,SIGNAL(clicked()),SLOT(searchUp()));
        buttonBar->addWidget(searchRight);

        window->setLayout(layout);
        setCentralWidget(window);
        window->show();

        radio->start();
    }

    Radio::~Radio()
    {
    }

    void Radio::freqUp()
    {
        int f = radio->frequency();
        f = f + radio->frequencyStep(QRadioTuner::FM);
        radio->setFrequency(f);
    }

    void Radio::freqDown()
    {
        int f = radio->frequency();
        f = f - radio->frequencyStep(QRadioTuner::FM);
        radio->setFrequency(f);
    }

    void Radio::searchUp()
    {
        radio->searchForward();
    }

    void Radio::searchDown()
    {
        radio->searchBackward();
    }

    void Radio::freqChanged(int)
    {
        freq->setText(QString("%1 kHz").arg(radio->frequency()/1000));
    }

    void Radio::signalChanged(int)
    {
        if(radio->signalStrength() > 25)
            signal->setText(tr("Got Signal"));
        else
            signal->setText(tr("No Signal"));
    }

    void Radio::updateVolume(int v)
    {
        radio->setVolume(v);
    }