.. index:: single: Building RingQt Applications for Mobile; Introduction ======================================= Building RingQt Applications for Mobile ======================================= In this chapter we will learn about Building RingQt Applications for Mobile. .. index:: pair: Building RingQt Applications for Mobile; Download Requirements Download Requirements ===================== Check the next link : http://doc.qt.io/qt-5/androidgs.html Download * The Android SDK Tools https://developer.android.com/studio/index.html * The Android NDK (Tested using android-ndk-r10c) https://developer.android.com/ndk/index.html * Apache Ant v1.8 or later http://ant.apache.org/bindownload.cgi * Java SE Development Kit (JDK) v6 or later http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html .. index:: pair: Building RingQt Applications for Mobile; Update the Android SDK Update the Android SDK ====================== Update the Android SDK to get the API and tools packages required for development Tested using Android 4.4.2 (API 19) * In Windows - Define the next Environment Variables based on your system. (1) JAVA_HOME .. code-block:: ring For Example : C:\Program Files (x86)\Java\jdk1.8.0_05 (2) ANDROID_HOME .. code-block:: ring For Example : B:\mahmoud\Tools\Java-Android\adt-bundle-windows-x86-20140702\sdk .. index:: pair: Building RingQt Applications for Mobile; Install Qt for Android Install Qt for Android ====================== * You can install Qt for Android from the next link https://download.qt.io/archive/qt/5.5/5.5.1/ * Run Qt Creator, Select Tools > Options > Android to add the Android NDK and SDK paths. http://doc.qt.io/qtcreator/creator-developing-android.html .. index:: pair: Building RingQt Applications for Mobile; Using Ring2EXE Using Ring2EXE ============== Starting from Ring 1.6 we can use Ring2EXE to quickly prepare Qt project for our application Example: .. code-block:: none ring2exe myapp.ring -dist -mobileqt .. note:: We can use the Distribute Menu in Ring Notepad .. tip:: The option ( Prepare Qt project for Mobile devices ) in the Distribute Menu .. index:: pair: Building RingQt Applications for Mobile; The Qt project for your Ring application The Qt project for your Ring application ======================================== After using Ring2EXE or the Distribute Menu in Ring Notepad * Using the Qt Creator Open the generated Qt project Folder : target/mobile/qtproject Project file : project.pro * Using Qt Creator, You will find the compiled Ring application in the resources (YourAppName.ringo) This file (Ring Object File) is generated by the Ring compiler using .. code-block:: none ring YourAppName.ring -go -norun * You can build your application using Qt Creator (1) You can add your application images to the resources Or You can use any text editor (Notepad) and modify : project.qrc (2) To find images from your Ring application, You need to use the file name in resources Example .. code-block:: ring if isandroid() mypic = new QPixmap(":/cards.jpg") else mypic = new QPixmap("cards.jpg") ok .. index:: pair: Building RingQt Applications for Mobile; Comments about developing for Android using RingQt Comments about developing for Android using RingQt ================================================== (1) The main project file is main.cpp This file load Ring Compiler/Virtual Machine and RingQt Then get the Ring Object File during the runtime from the resources Then run the Ring Object File (ringapp.ringo) using the Ring VM Through main.cpp you can extract more files from the resources to temp. folder once you add them (create projects with many files). (2) The next functions are missing from this Ring edition * Database (ODBC, SQLite & MySQL) * Security and Internet functions (LibCurl & OpenSSL) * RingAllegro (Allegro Library) * RingLibSDL (LibSDL Library) Just use Qt Classes through RingQt. For database access use the QSqlDatabase Class .. note:: All of the missing libraries ((LibCurl, OpenSSL & Allegro) can be compiled for Android, but they are not included in this Qt project. (3) use if isandroid() when you want to modify the code just for android Example: .. code-block:: ring if isandroid() // Android code else // other platforms ok (4) Sometimes you will find that the button text/image is repeated in drawing ! it's Qt problem that you can avoid using the next code. .. code-block:: ring if isandroid() setStyleSheet(" border-style: outset; border-width: 2px; border-radius: 4px; border-color: black; padding: 6px;") ok (5) Always use Layouts instead of manual setting of controls position and size. This is the best way to get the expected user interface to avoid problems like (controls with small/extra size) (6) When you deal with Qt Classes you can determine the images from resources (you don't need to copy them using main.cpp) Example: .. code-block:: ring if isandroid() mypic = new QPixmap(":/cards.jpg") else mypic = new QPixmap("cards.jpg") ok Now RingQt comes with the AppFile() function to determine the file name Example: .. code-block:: ring mypic = new QPixmap(AppFile("cards.jpg")) # Desktop or Android (7) When you update your project code, You don't have to use Ring2EXE to generate the Qt project again Just use the Distribute Menu in Ring Notepad and select (Generate Ring Object File) Then copy the YourAppName.ringo file to target/mobile/qtproject folder and accept replacing files. (8) If your application folder contains a Qt resource file (project.qrc) Then when you use Ring2EXE or Ring Notepad (Distribute - Prepare Qt project for Mobile devices) the resource file will be used See ring/applications/cards game as an example.