用qt的qml写的安卓摄像头程序

#include <QGuiApplication>
#include <QQmlApplicationEngine>
int main(int argc, char *argv[])
{QGuiApplication app(argc, argv);QQmlApplicationEngine engine;engine.load(QUrl(QStringLiteral("qrc:/main.qml")));return app.exec();
}

程序的大部分源码是照着《qt quick核心编程》书中的摄像头程序写的，但是源程序只是后置摄像头，我添加了调用前置摄像头，一点点改进

首先 FlatButton.qml 自定义有了一个按钮

import QtQuick 2.2
import QtQuick.Controls 1.2
Rectangle
{id:bkgnd;implicitWidth: 120;implicitHeight: 50color:"transparent";property  alias iconSource:icon.source;property  alias iconWidth:icon.width;property  alias  iconHeight:icon.height;property  alias textcolor:btnText.color;property  alias font:btnText.font;property  alias text:btnText.text;radius:6property bool hovered: false;border.color: "#949494";border.width: hovered ? 2:0;signal clicked;Image{id:icon;anchors.top: parent.top;anchors.topMargin: 5;//  anchors.margins: 4;anchors.horizontalCenter: parent.horizontalCenter;}Text{id:btnText;anchors.top: icon.bottom;anchors.horizontalCenter: icon.horizontalCenter;anchors.margins: 2;color: ma.pressed ? "blue" : (parent.hovered ? "#0000a0" : "white");}MouseArea{id:ma;anchors.fill:parent;hoverEnabled:true;onEntered: {bkgnd.hovered=true;}onExited: {bkgnd.hovered=false;}onClicked: {if(Qt.platform.os == "android"){bkgnd.hovered = false;}bkgnd.clicked();}}
}
main.qml实现了相机程序
import QtQuick 2.4
import QtQuick.Window 2.2
import QtMultimedia 5.4
import QtQuick.Controls 1.3
import QtQuick.Layouts 1.1
Window {visible: truewidth:  Qt.platform.os === "android"? Screen.width: 640height:  Qt.platform.os === "android"? Screen.height: 480color:"black";property var cameras: QtMultimedia.availableCamerasproperty int currentCamera: 0FlatButton {id:qiehuananchors.right: parent.right;anchors.rightMargin: 2;anchors.top: parent.top;iconSource: "res/11.png";width:Qt.platform.os === "android"? Screen.width/8:70;height: Qt.platform.os === "android"? Screen.width/8:70;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;visible: true;z:1onClicked: {currentCamera++if (currentCamera >= cameras.length)currentCamera = 0camera.deviceId = cameras[currentCamera].deviceId}}Camera{id:camera;captureMode: Camera.CaptureStillImage;//捕获静态图像focus{focusMode:Camera.FocusAuto;//自动变焦focusPointMode: Camera.FocusPointCenter;//中心焦点}imageProcessing{whiteBalanceMode:CameraImageProcessing.WhiteBalanceAuto;//白平衡自动}flash.mode:Camera.FlashAuto;//闪光灯自动imageCapture{resolution: Qt.size(1920,1080);onImageCaptured: {camera.stop();photoPreview.visible=true;actionBar.visible=false;viewfinder.visible=false;photoPreview.source=preview;qiehuan.visible=false;}onImageSaved: {console.log(path);}}onLockStatusChanged:{switch(lockStatus){case Camera.Locked:imageCapture.captureToLocation("camera.jpg");unlock();break;case Camera.Searching:console.log("searching");break;case Camera.unlocked:console.log("unlocked");break;}}}VideoOutput{id:viewfinder;source: camera;focus:visible;anchors.fill:parent;autoOrientation: true;
}
Image{id:photoPreview;anchors.fill:parent;visible: false;fillMode: Image.PreserveAspectFit;FlatButton{iconSource: "res/ic_launcher_camera.png";width: Qt.platform.os === "android"? Screen.width/8: 76  ;height:  Qt.platform.os === "android"? Screen.width/8: 76  ;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;anchors.left: parent.left;anchors.bottom: parent.bottom;anchors.margins: 4;onClicked: {camera.start();actionBar.visible=true;viewfinder.visible=true;photoPreview.visible=false;qiehuan.visible=true;}}
}
Image
{id:actionBar;source:"res/control_bar.png";width:Qt.platform.os === "android"? Screen.width: 640;height:Qt.platform.os === "android"? Screen.height/10: 80;anchors.bottom: parent.bottom;anchors.bottomMargin: 8;anchors.horizontalCenter: parent.horizontalCenter;visible: true;z:1;FlatButton{id:shutter;anchors.centerIn: parent;iconSource: "res/ic_cam_shutter.png";width:Qt.platform.os === "android"? Screen.width/7:88;height: Qt.platform.os === "android"? Screen.width/7:88;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;onClicked: {camera.searchAndLock();//计算并锁定图像，触发锁定信号}}FlatButton{id:zoomout;anchors.verticalCenter: shutter.verticalCenter;anchors.right: shutter.left;anchors.rightMargin: 4;width:Qt.platform.os === "android"? Screen.width/7:70;height: Qt.platform.os === "android"? Screen.width/7:70;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;text:"缩小";font.pointSize: 12;iconSource: "res/ic_zoom_out.png";onClicked: {if(camera.digitalZoom>1)camera.digitalZoom=-0.5;}}
FlatButton{id:zoomin;anchors.verticalCenter: shutter.verticalCenter;anchors.right: zoomout.left;anchors.rightMargin: 4;width:Qt.platform.os === "android"? Screen.width/7:70;height: Qt.platform.os === "android"? Screen.width/7:70;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;text:"放大";font.pointSize: 12;iconSource: "res/ic_zoom_in.png";onClicked: {if(camera.digitalZoom<camera.maximumDigitalZoom)camera.digitalZoom+=0.5;}
}
FlatButton{id:currentFlath;anchors.verticalCenter: shutter.verticalCenter;anchors.left: shutter.right;anchors.leftMargin: 4;width:Qt.platform.os === "android"? Screen.width/7:70;height: Qt.platform.os === "android"? Screen.width/7:70;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;font.pointSize: 12;property var   moderIcon:["res/ic_menu_stat_flash_auto.png","res/ic_menu_stat_flash.png","res/ic_menu_stat_flash_off.png"]property var  moderDesc:["自动","打开","关闭"]property var flashMode: [Camera.FlashAuto, Camera.FlashOn, Camera.FlashOff]property int mode: 0;text: moderDesc[mode];iconSource: moderIcon[mode];onClicked: {mode = (mode + 1)%3;camera.flash.mode = flashMode[mode];}}
FlatButton{id:currentScense;anchors.verticalCenter: shutter.verticalCenter;anchors.left: currentFlath.right;anchors.leftMargin: 4;width:Qt.platform.os === "android"? Screen.width/7:70;height: Qt.platform.os === "android"? Screen.width/7:70;iconHeight: Qt.platform.os === "android"? Screen.width/10:84;iconWidth: Qt.platform.os === "android"? Screen.width/10:84;font.pointSize: 12;property var  modeIcon: ["res/ic_menu_stat_auto.png","res/ic_menu_stat_portrait.png","res/ic_menu_stat_landscape.png","res/ic_menu_stat_night.png","res/ic_menu_stat_action.png"]property var modeDesc:["自动","人物","风景","夜间","运动"]property var exposureMode:[Camera.ExposureAuto,Camera.ExposurePortrait,Camera.ExposureBeach,Camera.ExposureNight,Camera.ExposureSports]property int  mode:0;text:modeDesc[mode];iconSource: modeIcon[mode];onClicked: {mode=(mode+1)%5;camera.exposure.exposureMode=exposureMode[mode];}}}
}

main.cpp函数

#include <QGuiApplication>

#include <QQmlApplicationEngine>

int main(int argc, char *argv[])

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();

在程序中加入了安卓程序启动画面

在andriod重点xml中加入

 <meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/splash"/>

找到res/drawble文件夹中的splash照片是自己设置的开机启动图片

源码下载链接我的qt版本是5.6 http://download.csdn.net/detail/qq_28637193/9610336

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