java
/
jMonkeyEngine-wiki
peilaus alkaen https://github.com/jMonkeyEngine/wiki.git


			
				
					
						
						
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<body class="article toc2 toc-left">
<div id="header">
<h1>Android Support in the jMonkeyEngine</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#requirements">Requirements</a>
<ul class="sectlevel2">
<li><a href="#developer-requirements">Developer Requirements</a></li>
<li><a href="#user-requirements">User Requirements</a></li>
</ul>
</li>
<li><a href="#features">Features</a>
<ul class="sectlevel2">
<li><a href="#jmonkeyengine3-android-integration">jMonkeyEngine3 Android Integration</a></li>
<li><a href="#jmonkeyengine-sdk-android-integration">jMonkeyEngine SDK Android Integration</a></li>
</ul>
</li>
<li><a href="#instructions">Instructions</a>
<ul class="sectlevel3">
<li><a href="#activate-android-deployment">Activate Android Deployment</a></li>
<li><a href="#build-and-run">Build and Run</a></li>
<li><a href="#installing-nbandroid">Installing NBAndroid</a></li>
<li><a href="#notes">Notes</a></li>
</ul>
</li>
<li><a href="#android-considerations">Android Considerations</a></li>
<li><a href="#using-android-specific-functions">Using Android specific functions</a></li>
<li><a href="#signing-an-apk">Signing an APK</a></li>
<li><a href="#more-info">More Info</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>jMonkeyEngine supports android deployment, and it&#8217;s fully integrated in the SDK.
The android support is in constant enhancement so if you have questions or suggestions, please leave a comment on the <a href="http://jmonkeyengine.org/groups/android/forum/topic/android-deployment-via-checkbox-is-here">Android forum thread</a>!</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="requirements">Requirements</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="developer-requirements">Developer Requirements</h3>
<div class="ulist">
<ul>
<li>
<p>Install <a href="documentation.html">jMonkeyEngine SDK</a> (Remember to install <a href="http://www.oracle.com/technetwork/java/javase/downloads/index.html">JDK</a>)</p>
</li>
<li>
<p>Install <a href="http://developer.android.com/sdk/index.html">Android SDK Manager 22.6.2</a> or newer.</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>(You don&#8217;t need the ADT Bundle for Windows. Choose “USE AN EXISTING IDE and download the SDK Tools)</p>
</li>
<li>
<p>It&#8217;s recommended to choose another destination folder.</p>
</li>
<li>
<p>Start the SDK Manager and install the default selected 13 packages (accept licenses)</p>
</li>
</ol>
</div>
</li>
</ul>
</div>
<div class="paragraph">
<p><span class="image"><img src="images/jme3/android_sdk_manager.png" alt="android_sdk_manager.png" height=""></span></p>
</div>
<div class="ulist">
<ul>
<li>
<p>(Optional) Install NBAndroid in the jMonkeyEngine SDK:</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>Go to Tools→Plugins→Available Plugins.</p>
</li>
<li>
<p>Install the “Android plugin.</p>
</li>
</ol>
</div>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="user-requirements">User Requirements</h3>
<div class="ulist">
<ul>
<li>
<p>Android 2.3 device or better with development mode (“USB-Debugging) enabled</p>
</li>
<li>
<p>Graphic card that supports OpenGL ES 2.0 or better</p>
</li>
<li>
<p><a href="http://jmonkeyengine.org/groups/android/forum/topic/does-my-phone-meet-the-requirements-necessary-to-run-jmonkeyengine-3/">Does my phone meet the requirements necessary to run jMonkeyEngine 3?</a></p>
</li>
<li>
<p>Remember to install the driver software on your computer</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="features">Features</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="jmonkeyengine3-android-integration">jMonkeyEngine3 Android Integration</h3>
<div class="ulist">
<ul>
<li>
<p>JME app encapsulated in an Android activity (the AndroidHarness).</p>
</li>
<li>
<p>JME display in a GlSurfaceView.</p>
</li>
<li>
<p>Android touch events are encapsulated into JME touch event or translated into mouse events.</p>
</li>
<li>
<p>Errors are handled universally in the Harness.</p>
</li>
<li>
<p>Lifecycle management</p>
<div class="ulist">
<ul>
<li>
<p>Leaving the activity with the Back key destroys the app (quit).</p>
</li>
<li>
<p>Leaving the activity with the Home key freezes the app in the background. When you return, the app is in the same state as when you left it (pause).</p>
</li>
</ul>
</div>
</li>
<li>
<p>Currently supports all jmetests except:</p>
<div class="ulist">
<ul>
<li>
<p>Post processing filters. Functional but most of the time very slow</p>
</li>
<li>
<p>Shadows. Functional but most of the time very slow</p>
</li>
<li>
<p>Water. Functional but very slow.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="jmonkeyengine-sdk-android-integration">jMonkeyEngine SDK Android Integration</h3>
<div class="paragraph">
<p>Mobile deployment is a “one-click option next to Desktop/WebStart/Applet deployment in the jMonkeyEngine SDK.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Automatic creation of Android harness and settings.</p>
<div class="ulist">
<ul>
<li>
<p>Ant script build target creates APK file.</p>
</li>
<li>
<p>Ant script run target executes APK on Android Emulator or mobile device.</p>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="instructions">Instructions</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Make sure you have installed the Android Project Support into the jMonkeyEngine SDK.</p>
</li>
<li>
<p>Open the jMonkeyEngine SDK Options&gt;Mobile and enter the path to your Android SDK directory, and click OK. E.g. <code>C:\Program Files\android-sdk</code></p>
</li>
</ol>
</div>
<div class="sect3">
<h4 id="activate-android-deployment">Activate Android Deployment</h4>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Open an existing JME3 project, or create a new JME3 project.</p>
</li>
<li>
<p>Right-click the project node in the Projects Window and open the Properties.</p>
</li>
<li>
<p>In the Application&gt;Android Properties, enable Android Deployment, and select an Android target. E.g. <code>Android 4.2.2</code><br>
This creates a “mobile folder in your projects directory. This folder contains a complete android project with correct settings to run the application using the AndroidHarness.</p>
</li>
<li>
<p>(Restart the jMonkeyEngine)</p>
</li>
<li>
<p>A Mobile Files node appears in the Project window.<br>
It lets you edit the MainActivitity.java, the AndroidManifest.xml, and build.properties.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p><span class="image"><img src="images/jme3/nvyyd.png" alt="nvyyd.png" height=""></span></p>
</div>
<div class="paragraph">
<p>The Android deployment option creates a separate sub-project for android and makes the main project and associated libraries available to the sub-project as libraries. The sub-project can be edited using NBAndroid (see below) or using Eclipse or any other IDE that supports standard android projects. Normally you do not need to edit the android project files. Exceptions are described further below. <em>The libraries are first added to the android sub-project when the main project is built for the first time.</em></p>
</div>
</div>
<div class="sect3">
<h4 id="build-and-run">Build and Run</h4>
<div class="paragraph">
<p>Open your game project in the jMonkeyEngine SDK.</p>
</div>
<div class="paragraph">
<p><strong>Building</strong></p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Right-click the project node to build your project.<br>
An APK file is created in the “dist folder.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p><strong>Running</strong></p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Right-click the project node and choose Set Main Project.</p>
</li>
<li>
<p>Select the “Android Device build configuration next to the Run toolbar button.</p>
</li>
<li>
<p><em>Make sure “Compile on Save is disabled in your project preferences.</em></p>
</li>
<li>
<p>Run the application on a connected phone by right-clicking it and selecting “Run or press the “Play button in the toolbar.</p>
</li>
<li>
<p>The application will run and output its log to the “Output window of the SDK.</p>
</li>
<li>
<p>When finished testing, click the “x next to the run status in the lower right to quit the logging output.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>The default android run target uses the default device set in the Android configuration utility. If you set that to a phone you can run the application directly on your phone, the emulator does not support OpenGLES 2.0 and cannot run the engine.</p>
</div>
<div class="paragraph">
<p><strong>will significantly lower performance</strong></p>
</div>
<div class="paragraph">
<p>Optionally, download <a href="http://code.google.com/p/jmonkeyengine/downloads/detail?name=Jme3Beta1Demo.apk&amp;can=1&amp;q=">Jme3Beta1Demo.apk</a></p>
</div>
<div class="paragraph">
<p>During build, the libraries and main jar file from the main project are copied to the android project libs folder for access. During this operation the desktop-specific libraries are replaced with android specific JARs.</p>
</div>
<div class="paragraph">
<p><strong>Be aware that logging has been identified as having a significant performance hit in Android applications. If getting poor performance please try turning logging either down or off and retesting.</strong></p>
</div>
</div>
<div class="sect3">
<h4 id="installing-nbandroid">Installing NBAndroid</h4>
<div class="paragraph">
<p>Activating the nbandroid plugin in the jMonkeyEngine SDK is optional, but recommended. You do not need the nbandroid plugin for Android support to work, however nbandroid will not interfere and will in fact allow you to edit the android source files and project more conveniently. To be able to edit, extend and code android-specific code in Android projects, install NBAndroid from the update center:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Open Tools→Plugins→Settings</p>
</li>
<li>
<p>Go to Tools→Plugins→Available Plugins.</p>
</li>
<li>
<p>Install the NbAndroid plugin. (Will show up as Android)</p>
</li>
</ol>
</div>
<div class="paragraph">
<p><strong>If the android plugin is not in that list follow <a href="http://www.nbandroid.org/p/installation.html">these instructions</a>.</strong></p>
</div>
</div>
<div class="sect3">
<h4 id="notes">Notes</h4>
<div class="ulist">
<ul>
<li>
<p>The package name parameter is only used when creating the project and only sets the android MainActivity package name</p>
</li>
<li>
<p>The needed android.jar comes with the plugin and is automatically added to the android build</p>
</li>
<li>
<p>All non-android project libraries are automatically excluded from the android build. This is currently hard-coded in the build script, check nbproject/mobile-impl.xml for the details.</p>
</li>
<li>
<p>The main application class parameter for the AndroidHarness is taken from the jme3 project settings when enabling android deployment. Currently it is not updated when you change the main class package or name.</p>
</li>
<li>
<p>When you disable the mobile deployment option, the whole “mobile” folder is deleted.</p>
</li>
<li>
<p>The “errors shown in the MainActivity are wrongly displayed only in the editor and will disappear when you install NBAndroid (see below).</p>
</li>
<li>
<p>To sign your application, edit the mobile/build.properties file to point at valid keystore files.</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="android-considerations">Android Considerations</h2>
<div class="sectionbody">
<div class="paragraph">
<p>You can use the jMonkeyEngine SDK to save (theoretically) any jMonkeyEngine app as Android app. But the application has to be prepared for the fact that Android devices have a smaller screen resolution, touchscreens instead of mouse buttons, and (typically) no keyboards.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>Inputs:</strong> Devise an alternate control scheme that works for Android users (e.g. using com.jme3.input.controls.TouchListener). This mobile scheme is likely quite different from the desktop scheme.</p>
</li>
<li>
<p><strong>Effects:</strong> Android devices do no support 3D features as well as PCs – or even not at all. This restriction includes post-processor filters (depth-of-field blur, bloom, light scattering, cartoon, etc), drop shadows, water effects, 3D Audio. Be prepared that these effects will (at best) slow down the application or (in the worst case) not work at all. Provide the option to switch to a low-fi equivalent!</p>
</li>
<li>
<p><strong>Nifty <abbr title="Graphical User Interface">GUI</abbr>:</strong> Use different base UI layout XML files for the mobile version of your app to account for a different screen resolution.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p><strong>Best Practice:</strong> Ideally, you write the core application code in a way that it checks for the environment it&#8217;s being run on, and automatically adapts the device&#8217;s limitations by switching off effects, changing input mechanisms etc. Learn how to <a href="jme3/advanced/read_graphic_card_capabilites.html">read graphic card capabilites</a> here.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="using-android-specific-functions">Using Android specific functions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>As described above, you should always try to design your application as platform independent as possible. If your game becomes a sudden hit on android, why not release it on Facebook as an applet as well? When your application is designed in a platform independent way, you don&#8217;t have to do much more but check a checkbox to deploy your application as an applet. But what if you want to for example access the camera of an android device? Inevitably you will have to use android specific api to access the camera.</p>
</div>
<div class="paragraph">
<p>Since the main project is not configured to access the android api directly, you have to install NBAndroid (see above) to be able to edit the created android project in the SDK. After installing, click the “open project button and navigate to the “mobile folder inside the main project folder (it should show up with an android “a icon) and open it.</p>
</div>
<div class="imageblock" style="text-align: right">
<div class="content">
<img src="images/jme3/android_access.png" alt="android_access.png" height="">
</div>
</div>
<div class="paragraph">
<p>Although you will use android specific api, using a camera is not exactly android specific and so you should try to design this part of the application as platform independent as possible as well. As an example, if you want to use the phones camera as an image input stream for a texture, you can create e.g. the AppState that manages the image and makes it available to the application inside the main project (no android code is needed). Then in the android part of the code you make a connection to the camera and update the image in the AppState. This also allows you to easily support cameras on other platforms in the same way or fallback to something else in case the platform doesn&#8217;t support a camera.</p>
</div>
<div class="paragraph">
<p>Note that you have to build the whole project once to make (new) classes in the main project available to the android part.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="signing-an-apk">Signing an APK</h2>
<div class="sectionbody">
<div class="paragraph">
<p>When you have a mobile project in the “important files” section you have an “Android Properties” file.+</p>
</div>
<div class="paragraph">
<p>There are 2 entries in this file :+</p>
</div>
<div class="paragraph">
<p>key.store=path/to/your/keystore/on/your/drive/mykeystore.keystore+</p>
</div>
<div class="paragraph">
<p>key.alias=mykeystorealias+</p>
</div>
<div class="paragraph">
<p>If those entries are filled, the apk will be signed during the build.+</p>
</div>
<div class="paragraph">
<p>You’ll be prompted when building to enter the password (twice). It will generate a signed apk in the dist folder of your project.+</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="more-info">More Info</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There is currently no proper guidance of running on android.
The SDK will later provide tools to adapt the materials and other graphics settings of the Android deployment version automatically.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://www.youtube.com/watch?feature=player_embedded&amp;v=np3N4pCCTPo">Youtube Video on Android deployment</a></p>
</li>
<li>
<p><a href="http://jmonkeyengine.org/groups/android/forum/topic/android-deployment-via-checkbox-is-here">Android Forum Thread (beta)</a></p>
</li>
<li>
<p><a href="http://jmonkeyengine.org/groups/android/forum/topic/how-to-run-your-jme3-application-on-android-androidharness">Android Forum Thread (alpha)</a>
&lt;tags&gt;&lt;tag target="documentation" /&gt;&lt;tag target="sdk" /&gt;&lt;tag target="android" /&gt;&lt;tag target="deployment" /&gt;&lt;tag target="tool" /&gt;&lt;/tags&gt;</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2016-05-21 23:44:18 UTC
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