Google Android has many features which make it special, but one important feature is Dalvik virtual machine (DVM). Which is a major component of the Android platform? It is optimized for low memory requirements and is designed to allow multiple VM instances to run at the same time.
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The DVM runs Java applications. However, it is different from a standard Java virtual machine in some ways. First, most virtual machines use a stack-based architecture, but Dalvik is a register-based architecture. Second, Dalvik runs Java applications which have been transformed into the Dalvik Executable (.dex) format which is optimized for minimal memory footprint The Dalvik VM relies on the Linux kernel for underlying functionality such as threading and low-level memory management. Java virtual machine tool interface (JVM TI) is a native programming interface on Java virtual machine. The interface provides functionalities to inspect the state of a virtual machine, gather information during runtime, and also control the execution of applications running on the Java virtual machine. Android has a built-in integrated browser based on the open source
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WebKit engine & built-in powerful SQL database engine called SQLite, use for structured data storage. Android support for common audio, video, and still image formats such as AAC, MPEG4, H.264, MP3, AMR, & contains Rich development environment including a device emulator, tools for debugging, & a plug-in for the Eclipse.
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