首页 > 代码库 > Qt for Android开发总结

Qt for Android开发总结

近段时间,本人使用Qt5.3.0开发了Android应用,由于官方资料较少,在此记录开发过程遇到的问题及解决方法

1.Android平台的视频播放,只能使用qml的MediaPlayer

2.qml中控件的路径必须加file://  例如:

  Image{            source: "file:///mnt/usbhost1/Config/logo.png"        }

3.C++与qml中js的方法互调

QQuickView view;view.setSource(QUrl(QStringLiteral("qrc:///qml/MainView.qml")));QObject *qmlObj =(QObject*) view.rootObject();MainWnd *w=new MainWnd(object);
//暴露C++类给qml供其调用,别名mainWndClassview.engine ()
->rootContext ()->setContextProperty (QLatin1String("mainWndClass"),w);//c++调用qml中的js方法//参数必须转换为QVariantQMetaObject::invokeMethod (qmlObj,"showRight",Q_ARG(QVariant,1));//调用子项的js方法qmlPlayer = qmlObj->findChild<QObject*>("playerArea");QMetaObject::invokeMethod (qmlPlayer,"setVideoFile",Q_ARG(QVariant,currentVideoFile));
//MainView.qmlRectangle {    anchors.fill: parent    property int leftAreaWidth: this.width/5*4    property int rightAreaWidth: this.width/5    property int queueFontSize    function showRight(isShow){        ....    }    Player{        id:playerArea        //设置objectName,在c++中才能找到它        objectName: "playerArea"        width: parent.width        height: parent.height    }

4.c++调用java Android api

在项目目录下建立目录\android\src\org\rophie\ProjectName\JavaClass.java  

org\rophie\ProjectName即为java类的包名package org.rophie.ProjectName;

如我调用Android API调节系统音量

package org.rophie.ProjectName;import org.qtproject.qt5.android.bindings.QtActivity;import android.widget.Toast;import android.media.AudioManager;import android.content.Context;public class JavaClass extends QtActivity{    private static JavaClass m_instance;    private static AudioManager mAudioManager;    public JavaClass()    {        //构造函数必须        m_instance = this;    }     public static void setVolume(int vol){     if(mAudioManager==null){         mAudioManager = (AudioManager)m_instance.getSystemService(Context.AUDIO_SERVICE);     }         mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, vol, 0);     }}

C++调用

QAndroidJniObject::callStaticMethod<void>("org/rophie/ProjectName/JavaClass","setVolume","(I)V",3);//具体参照QAndroidJniObject类

 5.BroadcastReceiver实现开机自启,和Android一模一样

public void onReceive(Context context, Intent intent) { ...... //JavaClass为继承QtActivity的java主类 Intent intent2 = new Intent(context, JavaClass.class); ......}

 6.调用第三方jar包,在src同级目录下新建目录libs,将.jar拷入即可使用

Qt for Android开发总结