#qt creator

Сегодня я сделал обновление для “Color Rain”. Устранил небольшие ошибки, добавил стартовый экран, режим паузы и фоновую музыку. При добавлении музыки я заметил интересную особенность. 

По умолчанию, android-приложение “замораживается” при сворачивании, то есть останавливаются все таймеры, анимация, но не музыка. :) Музыка продолжает проигрываться в фоне.

Для того, чтобы приложение корректно работало в фоне, нам нужно изменить файл AndoidManifest.xml. При создании нового android приложения Qt Creator не создает AndoidManifest.xml автоматически, при этом во время сборки и установки под android он использует собственный “шаблон” AndroidManifest’a.

Создадим AndoidManifest.xml, который включает в себя “шаблон” AndroidManifest’a от Qt:

Проекты -> Добавить сборку под Andoid -> Открываем вкладку “Сборка” -> Нажимаем “Подробнее” в "Собрать Android APK” -> Нажимаем “Создать шаблоны”.

Далее нам нужно найти и заменить 

<meta-data android:name="android.app.background_running" android:value="false"/>

на

<meta-data android:name="android.app.background_running" android:value="true"/>

Всё, теперь наше приложение работает в фоне. 

Для остановки проигрывания музыки нам поможет следующая переменная:

property bool active: Qt.application.state !== Qt.ApplicationSuspended

При изменении значения переменной active c true на false останавливаем всю музыку.

Audio {    id: music

Usando OpenCV no Ubuntu

Galera, sejam bem vindos a este tutorial. Nós do blog da robótica estamos utilizando o QT Creator da empresa Digia para executar o OpenCV no Ubuntu.

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"Чистый" C++ в Qt Creator?

The welfare habrovechera?

/* Вопрос «Qt Creator-знатокам»: */

As in Qt Creator to write-compile-debug-collect-run programs written ++ without using library Qt?

Nu and v dogonku, as Qt Creator friends with Python and PyQt? Original post

I have been working on the Smartphone Brain Scanner code a bit and one of the extra non-public repositories with Arek's program for real-time source reconstruction. There are explanations on how to setup a development environment and I have previously described issues around the setup of the Smartphone Brain Scanner. There are still a few things I forget about, so I note them here.

On the Nexus 7 tablet device:

Settings -> About tablet -> Press a number of times on "Build Number". This enables developer mode on the device.

Allow USB debugging in the settings on the device to allow the development PC to connect to the device

On the development PC:

Open Necessitas QT Creator

Load, e.g., sbs2-HelloWorld

Select appropriate build target on the Android logo in the left panel

Hook the device to the development computer

Press the "Run" triangle ctrl+R

On the device:

Install Ministro II when the device ask about it and the also download the extra libraries (The QT libraries) when the program ask for it.

A few popup windows appear: One asks for Google to check applications. I answered no there. The other is for granting access to the the hidraw device on the Linux device. I press Grant there.

sbs2-Brain3D/android/local.properties should maybe be edited to something like "sdk.dir=/opt/NecessitasQtSDK/android-sdk/" and sbs2-Brain3D/android/project.properties=android-8.

Data should be copied to the device. Data is available in smartphonebrainscanner2-core/sbs2_data

/opt/NecessitasQtSDK/android-sdk/platform-tools/adb shell mkdir /sdcard/smartphonebrainscanner2_data /opt/NecessitasQtSDK/android-sdk/platform-tools/adb push ~/projects/smartphonebrainscanner2-core/sbs2_data /sdcard/smartphonebrainscanner2_data find -type f -exec /opt/NecessitasQtSDK/android-sdk/platform-tools/adb push {} /sdcard/smartphonebrainscanner2_data/ \; /opt/NecessitasQtSDK/android-sdk/platform-tools/adb push mesh_ctx_5124_normals.obj /sdcard/smartphonebrainscanner2_data/

The logging application output is available in QT Creator. However, the Nexus 7 device only have one USB connection so if the Emotiv dongle is hooked up one cannot see the logging. Retrospectively, it can been seen with:

/opt/NecessitasQtSDK/android-sdk/platform-tools/adb logcat

As I have previously reported I have been setting up a git repository and now begun to work with the code in ti.

I have been changing a bit in a directory called sbs2-Brain3D (an application related to the Smartphone Brain Scanner project), and now got it under git, so I will move the old directory

mv sbs2-Brain3D sbs2-Brain3D-nogit git clone [email protected]:sbs2-Brain3D diff -r sbs2-Brain3D-nogit sbs2-Brain3D # or perhaps better sudo aptitude install xxdiff xxdiff -r sbs2-Brain3D-nogit sbs2-Brain3D

There are several changes that needs to be made.

Instead of changing in the original Arek code I will work on my own line of code by Branching with git:

cd sbs2-Brain3D git checkout -b fnielsen

The "git checkout -b" changes branch which can be verified with "git branch" that lists "fnielsen" and "master".

After local changes with commit the branch is not available on the remote repository: A cloning in another directly with "$ git clone -b fnielsen [email protected]:sbs2-Brain3D" will generate "warning: Remote branch fnielsen not found in upstream origin, using HEAD instead". But the local branch (here 'fnielsen') can be pushed to a remote branch (here 'fnielsen') by "$ git push -u origin fnielsen" and then the remote branch is clonable with "$ git clone -b fnielsen [email protected]:sbs2-Brain3D".

To help me getting an overview of the C++ code I tried several programs.

sudo aptitude install cflow sudo aptitude install clang sudo aptitude install doxygen doxygen-gui doxywizard

The doxywizard GUI program turned out to be straightforward for me to understand and it produces a configuration file and a button to invoke doxygen that makes nice graphviz call and class hierarchy graphs. But oops, the doxywizard cannot read its saved file...

The Necessitas QT Creator supports doxygen documentation in the code.