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mainWndClass
view.engine ()->rootContext ()->setContextProperty (QLatin1String("mainWndClass"),w); //c++调用qml中的js方法
//参数必须转换为QVariant
QMetaObject::invokeMethod (qmlObj,"showRight",Q_ARG(QVariant,));
//调用子项的js方法
qmlPlayer = qmlObj->findChild<QObject*>("playerArea");
QMetaObject::invokeMethod (qmlPlayer,"setVideoFile",Q_ARG(QVariant,currentVideoFile));
//MainView.qml Rectangle {
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",); //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