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<div class="section" id="building-ringqt-applications-for-mobile">
<span id="index-0"></span><h1>Building RingQt Applications for Mobile<a class="headerlink" href="#building-ringqt-applications-for-mobile" title="Permalink to this headline">¶</a></h1>
<p>In this chapter we will learn about Building RingQt Applications for Mobile.</p>
<div class="section" id="download-requirements">
<span id="index-1"></span><h2>Download Requirements<a class="headerlink" href="#download-requirements" title="Permalink to this headline">¶</a></h2>
<p>Check the next link : <a class="reference external" href="http://doc.qt.io/qt-5/androidgs.html">http://doc.qt.io/qt-5/androidgs.html</a></p>
<p>Download</p>
<ul>
<li><p>The Android SDK Tools</p>
<blockquote>
<div><p><a class="reference external" href="https://developer.android.com/sdk/index.html">https://developer.android.com/sdk/index.html</a></p>
</div></blockquote>
</li>
<li><p>The Android NDK (Tested using android-ndk-r21)</p>
<blockquote>
<div><p><a class="reference external" href="http://developer.android.com/tools/sdk/ndk/index.html">http://developer.android.com/tools/sdk/ndk/index.html</a></p>
</div></blockquote>
</li>
<li><p>Java SE Development Kit (JDK) v6 or later</p>
<blockquote>
<div><p><a class="reference external" href="https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html">https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html</a></p>
</div></blockquote>
</li>
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<div class="section" id="update-the-android-sdk">
<span id="index-2"></span><h2>Update the Android SDK<a class="headerlink" href="#update-the-android-sdk" title="Permalink to this headline">¶</a></h2>
<p>Update the Android SDK to get the API and tools packages required for development</p>
<blockquote>
<div><p>Tested using Android 4.4.2 (API 19)</p>
</div></blockquote>
<ul class="simple">
<li><p>In Windows - Define the next Environment Variables based on your system.</p></li>
</ul>
<ol class="arabic simple">
<li><p>JAVA_HOME</p></li>
</ol>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">For</span> <span class="n">Example</span> <span class="p">:</span> <span class="n">C</span><span class="p">:</span><span class="o">\</span><span class="n">Program</span> <span class="n">Files</span> <span class="p">(</span><span class="n">x86</span><span class="p">)</span><span class="o">\</span><span class="n">Java</span><span class="o">\</span><span class="n">jdk1</span><span class="p">.</span><span class="mf">8.0_05</span>
</pre></div>
</div>
<ol class="arabic simple" start="2">
<li><p>ANDROID_HOME</p></li>
</ol>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">For</span> <span class="n">Example</span> <span class="p">:</span> <span class="n">C</span><span class="p">:</span><span class="o">\</span><span class="n">JavaAndroid</span><span class="o">\</span><span class="n">AndroidSDK</span>
</pre></div>
</div>
</div>
<div class="section" id="install-qt-for-android">
<span id="index-3"></span><h2>Install Qt for Android<a class="headerlink" href="#install-qt-for-android" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p>You can install Qt for Android from the next link</p>
<blockquote>
<div><p><a class="reference external" href="https://download.qt.io/archive/qt/5.12/5.12.6/">https://download.qt.io/archive/qt/5.12/5.12.6/</a></p>
</div></blockquote>
</li>
<li><dl>
<dt>Run Qt Creator, Select Tools > Options > Android to add the</dt><dd><p>Android NDK and SDK paths.</p>
<blockquote>
<div><p><a class="reference external" href="http://doc.qt.io/qtcreator/creator-developing-android.html">http://doc.qt.io/qtcreator/creator-developing-android.html</a></p>
</div></blockquote>
</dd>
</dl>
</li>
</ul>
</div>
<div class="section" id="using-ring2exe">
<span id="index-4"></span><h2>Using Ring2EXE<a class="headerlink" href="#using-ring2exe" title="Permalink to this headline">¶</a></h2>
<p>We can use Ring2EXE to quickly prepare Qt project for our application</p>
<p>Example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>ring2exe myapp.ring -dist -mobileqt
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>We can use the Distribute Menu in Ring Notepad</p>
</div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>The option ( Prepare Qt project for Mobile devices ) in the Distribute Menu</p>
</div>
</div>
<div class="section" id="the-qt-project-for-your-ring-application">
<span id="index-5"></span><h2>The Qt project for your Ring application<a class="headerlink" href="#the-qt-project-for-your-ring-application" title="Permalink to this headline">¶</a></h2>
<p>After using Ring2EXE or the Distribute Menu in Ring Notepad</p>
<ul>
<li><p>Using the Qt Creator Open the generated Qt project</p>
<blockquote>
<div><p>Folder : target/mobile/qtproject</p>
<p>Project file : project.pro</p>
</div></blockquote>
</li>
<li><p>Using Qt Creator, You will find the compiled Ring application in the resources (YourAppName.ringo)</p>
<blockquote>
<div><p>This file (Ring Object File) is generated by the Ring compiler using</p>
</div></blockquote>
</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>ring YourAppName.ring -go -norun
</pre></div>
</div>
<ul class="simple">
<li><p>You can build your application using Qt Creator</p></li>
</ul>
<ol class="arabic">
<li><p>You can add your application images to the resources</p>
<blockquote>
<div><p>Or You can use any text editor (Notepad) and modify : project.qrc</p>
</div></blockquote>
</li>
<li><p>To find images from your Ring application, You need to use the file name in resources</p>
<blockquote>
<div><p>Example</p>
</div></blockquote>
</li>
</ol>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">isandroid</span><span class="p">()</span>
<span class="n">mypic</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QPixmap</span><span class="p">(</span><span class="s">":/cards.jpg"</span><span class="p">)</span>
<span class="k">else</span>
<span class="n">mypic</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QPixmap</span><span class="p">(</span><span class="s">"cards.jpg"</span><span class="p">)</span>
<span class="k">ok</span>
</pre></div>
</div>
</div>
<div class="section" id="comments-about-developing-for-android-using-ringqt">
<span id="index-6"></span><h2>Comments about developing for Android using RingQt<a class="headerlink" href="#comments-about-developing-for-android-using-ringqt" title="Permalink to this headline">¶</a></h2>
<ol class="arabic">
<li><p>The main project file is main.cpp</p>
<blockquote>
<div><p>This file load Ring Compiler/Virtual Machine and RingQt</p>
<p>Then get the Ring Object File during the runtime from the resources</p>
<p>Then run the Ring Object File (ringapp.ringo) using the Ring VM</p>
<p>Through main.cpp you can extract more files from the resources to temp. folder once you
add them (create projects with many files).</p>
</div></blockquote>
</li>
<li><p>The next functions are missing from this Ring edition</p>
<blockquote>
<div><ul class="simple">
<li><p>Database (ODBC, SQLite & MySQL)</p></li>
<li><p>Security and Internet functions (LibCurl & OpenSSL)</p></li>
<li><p>RingAllegro (Allegro Library)</p></li>
<li><p>RingLibSDL (LibSDL Library)</p></li>
</ul>
<p>Just use Qt Classes through RingQt.</p>
<p>For database access use the QSqlDatabase Class</p>
</div></blockquote>
</li>
</ol>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>All of the missing libraries ((LibCurl, OpenSSL & Allegro) can be compiled for Android, but they are not included in this Qt project.</p>
</div>
<ol class="arabic simple" start="3">
<li><p>use if isandroid() when you want to modify the code just for android</p></li>
</ol>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">isandroid</span><span class="p">()</span>
<span class="o">//</span> <span class="n">Android</span> <span class="n">code</span>
<span class="k">else</span>
<span class="o">//</span> <span class="k">other</span> <span class="n">platforms</span>
<span class="k">ok</span>
</pre></div>
</div>
<p>(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.</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span>if isandroid()
setStyleSheet("
border-style: outset;
border-width: 2px;
border-radius: 4px;
border-color: black;
padding: 6px;")
ok
</pre></div>
</div>
<ol class="arabic simple" start="5">
<li><p>Always use Layouts instead of manual setting of controls position and size.</p></li>
</ol>
<p>This is the best way to get the expected user interface to avoid problems like (controls with small/extra size)</p>
<ol class="arabic simple" start="6">
<li><p>When you deal with Qt Classes you can determine the images from resources (you don’t need to copy them using main.cpp)</p></li>
</ol>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">isandroid</span><span class="p">()</span>
<span class="n">mypic</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QPixmap</span><span class="p">(</span><span class="s">":/cards.jpg"</span><span class="p">)</span>
<span class="k">else</span>
<span class="n">mypic</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QPixmap</span><span class="p">(</span><span class="s">"cards.jpg"</span><span class="p">)</span>
<span class="k">ok</span>
</pre></div>
</div>
<p>Now RingQt comes with the AppFile() function to determine the file name</p>
<p>Example:</p>
<div class="highlight-ring notranslate"><div class="highlight"><pre><span></span><span class="n">mypic</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QPixmap</span><span class="p">(</span><span class="n">AppFile</span><span class="p">(</span><span class="s">"cards.jpg"</span><span class="p">))</span> <span class="c"># Desktop or Android</span>
</pre></div>
</div>
<ol class="arabic simple" start="7">
<li><p>When you update your project code, You don’t have to use Ring2EXE to generate the Qt project again</p></li>
</ol>
<p>Just use the Distribute Menu in Ring Notepad and select (Generate Ring Object File)</p>
<p>Then copy the YourAppName.ringo file to target/mobile/qtproject folder and accept replacing files.</p>
<ol class="arabic simple" start="8">
<li><p>If your application folder contains a Qt resource file (project.qrc)</p></li>
</ol>
<p>Then when you use Ring2EXE or Ring Notepad (Distribute - Prepare Qt project for Mobile devices) the
resource file will be used</p>
<p>See ring/applications/cards game as an example.</p>
</div>
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