{"id":84628,"date":"2021-09-18T09:00:47","date_gmt":"2021-09-18T03:30:47","guid":{"rendered":"https:\/\/techvidvan.com\/tutorials\/?p=84628"},"modified":"2024-08-05T22:22:48","modified_gmt":"2024-08-05T16:52:48","slug":"android-dalvik-virtual-machine","status":"publish","type":"post","link":"https:\/\/techvidvan.com\/tutorials\/android-dalvik-virtual-machine\/","title":{"rendered":"Android Dalvik Virtual Machine"},"content":{"rendered":"<p>In this article, we will delve into the Android Dalvik Virtual Machine. Understanding the Dalvik Virtual Machine is crucial for any Android developer, as it plays a vital role in how your build projects run on various devices. These devices are not limited to mobile phones but also include Android televisions, smartwatches, tablets, and more.<\/p>\n<p>Our goal is to familiarize you with the processes that enable your apps to execute seamlessly on Android devices. By understanding the Dalvik Virtual Machine, you will gain insights into the underlying mechanisms that drive your applications, enhancing your development skills and ensuring your apps perform optimally across different platforms.<\/p>\n<h3>About Android Dalvik Virtual Machine<\/h3>\n<p>Android Dalvik Virtual Machine got its name after the name of Dalvik, which is the name of a place in Iceland. Dan Bornstein developed it. Android Dalvik Virtual Machine is very similar to Java Virtual Machine(JVM).<\/p>\n<p>JVM itself is widely used and provides quite a high performance and better memory management. However, JVM is not compatible with working optimally with low-powered handheld devices like smartphones, tablets, smartwatches, etc.<\/p>\n<p>Due to this reason, the Android Dalvik Virtual Machine came into existence. A virtual machine is a software representation of an actual physical device. It implies that you don\u2019t have a physical device but have a model in your system. The representation works quite similarly to how an actual physical device would work.<\/p>\n<p>Dalvik Virtual Machine is configured to work on low-powered devices optimally. Dalvik Virtual Machine provides high-performance features, better memory management, and battery life for low-powered handheld devices. It was developed exclusively for android devices and allowed several apps to execute on the virtual machine.<\/p>\n<h3>Role of Android Dalvik Virtual Machine<\/h3>\n<p>There are several roles which a Dalvik Virtual Machine has to play on an android device.<\/p>\n<ul>\n<li>Providing better performance and memory management<\/li>\n<li>Working optimally with any low-powered devices and also optimizing the battery life.<\/li>\n<li>Converting java class files to .dex file through Dex Compiler which can inturn execute in the Dalvik Virtual Machines<\/li>\n<li>Allowing multiple instances of the applications to run at the same time<\/li>\n<li>Allowing each application to have their instances<\/li>\n<li>Providing faster execution without affecting the battery life<\/li>\n<\/ul>\n<h3>Working of Dex Compiler<\/h3>\n<p><a href=\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/sites\/2\/2021\/08\/Working-of-Dex-Compiler-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-84794\" src=\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/sites\/2\/2021\/08\/Working-of-Dex-Compiler-1.jpg\" alt=\"Working of Dex Compiler\" width=\"720\" height=\"502\" \/><\/a><\/p>\n<p>Dex Compiler is a part of the Dalvik Virtual Machine and helps convert the java class to executable .dex files. We need to understand the whole process of how the source code is finally converted to a runnable APK file.<br \/>\nThe below figure describes the working of the Dalvik Virtual machine along with the Dex Compiler.<\/p>\n<p>Whenever you write your codes, they are immediately converted to a .class file using the Java Compiler. After that, the Dex Compiler comes into the picture. The dex compiler task converts the generated .class file into a .dex file (Dalvik Byte Code). This .dex file is then converted to the .apk file with the help of AAPT packaging.<\/p>\n<h3>Difference between Android Dalvik Virtual Machine and Android Runtime(ART)<\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Android Dalvik Virtual Machine\u00a0<\/b><\/td>\n<td><b>Android Runtime(ART)<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">It(DVM) converts the bytecode whenever you start a specific application<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime(ART) converts the bytecode only once that too during the installation of that application<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">It is slower than Android Runtime<\/span><\/td>\n<td><span style=\"font-weight: 400;\">It is faster than Android Dalvik Virtual Machine<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">When we consider Booting, then Android Dalvik Virtual Machine is fast<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime is lagging in terms of booting<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">The Cache is built fast over time and hence reduces boot time<\/span><\/td>\n<td><span style=\"font-weight: 400;\">The Cache time is made at the first boot and thus takes time while booting<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Dalvik Virtual Machine works better with low space capacity devices<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime requires a large amount of space as it stores both the compiled app as well as the APK<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">It is a tested and stable virtual machine<\/span><\/td>\n<td><span style=\"font-weight: 400;\">It is currently new and is experimental<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Dalvik Virtual Machine uses less space as it uses JIT (Just In Time) Compiler<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime uses more space as it uses the AOT (Ahead Of Time) compiler<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Dalvik Virtual Machine doesn\u2019t provide optimized battery life as it consumes more power<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime provides optimized battery performance as it consumes less power.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Dalvik Virtual Machine has a poor garbage collection compared to Android Runtime<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime has a better garbage collection compared to Dalvik Virtual Machine<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Dalvik Virtual Machine based apps are less responsive compared to Android Runtime<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime based apps are more responsive compared to Android Dalvik Virtual Machine<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">This is old and is now replaced by Android Runtime<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Android Runtime can be thought of as an upgraded version of Android Dalvik Virtual Machine and provides a lot of improvements<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Advantages of Dalvik Virtual Machine<\/h3>\n<ul>\n<li>The execution is faster in Android Dalvik Virtual Machine<\/li>\n<li>The Dalvik Virtual Machine has a lower boot time<\/li>\n<li>Dalvik Virtual Machine is specifically designed to work on Android devices<\/li>\n<li>Every Application can have their instance<\/li>\n<li>Android Dalvik Virtual Machine supports running of multiple instances<\/li>\n<li>It uses Just in Time (JIT) compiler due to which it consumes less space<\/li>\n<li>It is capable of executing APK files<\/li>\n<\/ul>\n<h3>Disadvantages of Dalvik Virtual Machine<\/h3>\n<ul>\n<li>Dalvik Virtual Machine is only supportive for Android Operating System<\/li>\n<li>Dalvik Virtual Machine has a poor garbage collection system<\/li>\n<li>The installation of the app takes more time due to the presence of Dex<\/li>\n<li>You require more instructions than register machine to implement the same high-level code<\/li>\n<\/ul>\n<h3>Summary<\/h3>\n<p>You came across what Dalvik Virtual Machine is and why it is used in Android through this article. You saw the working of Dex Compiler and came across the steps through which your source code is converted to an executable APK file. Then you also saw the roles and applications of the Dalvik Virtual Machine.<\/p>\n<p>Moving further, you came across the difference between Android Dalvik Virtual Machine(DVM) and Android Runtime(ART). Finally, you saw the advantages and disadvantages of the Android Dalvik Virtual Machine.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we will delve into the Android Dalvik Virtual Machine. Understanding the Dalvik Virtual Machine is crucial for any Android developer, as it plays a vital role in how your build projects&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":84793,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2791],"tags":[4284,4285,3543,4286],"class_list":["post-84628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android","tag-advantages-of-dalvik-virtual-machine","tag-android-dalvik-virtual-machine","tag-android-runtime","tag-disadvantages-of-dalvik-virtual-machine"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Android Dalvik Virtual Machine - TechVidvan<\/title>\n<meta name=\"description\" content=\"See what is Dalvik Virtual Machine &amp; its use Android. 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