Is a Dalvik virtual machine instance created for each application? –

Development issue/problem:

Is a Dalvik virtual machine instance created for each application, or do all Android applications have the same Dalvik virtual machine instance?

How can I solve this problem?

Solution 1:

Each Android application runs on its own process, with its own copy of Dalvik’s virtual machine. Dalvik is written to work effectively with multiple VMs.

The Dalvik VM runs files in the Dalvik Executable (.dex) format, which is optimized for minimal memory usage.

The VM is based on a registry and runs classes compiled with the Java compiler and converted to the .dex format with the included dx tool.

And look what… Dalvik Virtual Machine for a detailed description of the VDD.

Solution 2:

  1. Dalvik’s virtual machine is made especially for Android. It is designed with battery life and processing power in mind and is free of charge.
  2. We use the Dalvik VM instead of the Java Virtual Machine (JVM) because the Java compiler and tools are free, but the JVM is not free. The Android developers of Google have therefore developed their own virtual machine and offer it as free of charge.
  3. A virtual machine is necessary because it helps with debugging, like a virtual computer, so that my applications can run the same way on different devices.

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Solution 3:

The .java file is passed to the Java compiler (javac) to generate the .class file.

All .class files are passed to the dx tool to create a single dex file.

The dex file is sent to Dalvik’s virtual machine to generate the final machine code.

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The final machine code is sent to the processor for execution.

Solution 4:

All basic apk source code is written in Java. When creating this project all .java files are converted to .class, now the adk dx tool converts all .class files to a class.dex file, and this class.dex file is executed on the dalvik virtual machine.

More information about dalvik’s virtual machine: http://www.slideshare.net/jserv/understanding-the-dalvik-virtual-machine

The Dalvik Virtual Machine is designed to run multiple virtual machines simultaneously.
For example, each application runs in its own process, with its own copy of Dalvik’s virtual machine, as specified in @sahilMahajanMj.

And this class.dex file is further optimized for the odex file and stored in /dalvik/dalvik-cache
To learn more about odex, click this button.

If you want to know why DVM for Android, why not JVM click this button

Solution No 5:

Dalvik is the virtual machine that runs all Android applications. Thanks to Dalvik, the device can work with several virtual machines thanks to better memory management, as Dalvik’s VMs are register-based and therefore memory-based.

Each Android application runs on its own process, with its own copy of VM Dalvik.
Java files are first converted to a .class file by the Java compiler
The .class files are passed to the dx tool, which converts them to .dex format
The .dex file is passed to DVM to get the machine code
The machine code is executed by the processor

The .apk file contains a .dex file in zip format that can be run on virtual Dalvik machines.

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Why Dalvik?
1. The DVM’s are designed to run on battery power, with computing power and free
2 sound. We use DVM instead of JVM because JVM is not the free Dalvik
VM that ensures consistency across all mobile devices, i.e. an application works the same on different devices.

Good luck!

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