如何在Ubuntu QML应用中播放音乐

昨天我看见一个开发者发了一个问题，询问如何播放声音。目前由于一些原因在模拟器中没法测试。其实，播放声音很容易。如果使用qmake的话，可能需要做一些修改才可以正确地在手机上播放。

我们首先使用SDK来创建一个简单的项目（QML app with Simple UI "qmake")。我们记得修改我们的Main.qml如下：

import QtQuick 2.0
import Ubuntu.Components 1.1
import QtMultimedia 5.0

/*!
    \brief MainView with a Label and Button elements.
*/

MainView {
    // objectName for functional testing purposes (autopilot-qt5)
    objectName: "mainView"

    // Note! applicationName needs to match the "name" field of the click manifest
    applicationName: "audio.liu-xiao-guo"

    /*
     This property enables the application to change orientation
     when the device is rotated. The default is false.
    */
    //automaticOrientation: true

    // Removes the old toolbar and enables new features of the new header.
    useDeprecatedToolbar: false

    width: units.gu(100)
    height: units.gu(75)

    Page {
        title: i18n.tr("Audio")

        SoundEffect {
            id: bubblepop
            source: "bubblepop.wav"
            volume: 1.0
        }

        MediaPlayer {
            id: backgroundMusic
            source: "background.mp3"
            autoPlay: true
            loops: MediaPlayer.Infinite
            volume: 0.3
        }

        Row {
            anchors.centerIn: parent
            Button {
                text: "Play bubble"

                onClicked: {
                    bubblepop.play();
                }
            }
        }

    }
}

import QtMultimedia 5.0

添加“audio” security policy。由于我们使用qmake，所以在我们的应用中需要修改我们的.pro文件来包含我们的声音文件：

TEMPLATE = aux
TARGET = audio

RESOURCES += audio.qrc

QML_FILES += $$files(*.qml,true)              $$files(*.js,true)              $$files(sounds/*.mp3,true)              $$files(sounds/*.wav,true)

CONF_FILES +=  audio.apparmor                audio.desktop                audio.png

OTHER_FILES += $${CONF_FILES}                $${QML_FILES}

#specify where the qml/js files are installed to
qml_files.path = /audio
qml_files.files += $${QML_FILES}

#specify where the config files are installed to
config_files.path = /audio
config_files.files += $${CONF_FILES}

INSTALLS+=config_files qml_files

所有的源码在： git clone https://gitcafe.com/ubuntu/audio.git