Android

Popular posts from this blog

Dalvik Virtual machine VS Java Virtual Machine:

Dalvik Virtual machine :          (DVM) is Register Architecture, designed to run on low memory, uses its own byte code and runs .Dex file (Dalvik Executable File) Java Virtual Machine :         (JVM) is Stack Architecture, uses java byte code and runs .class file having JIT. Java  source code is compiled by the Java compiler into .class files. Then the dx (dexer) tool, part of the Android SDK processes the .class files into a proprietary file format called DEX that contains Dalvik bytecode. Difference between .class and .dex file format           ● In DEX all the classes of the application are packed into one file.           ● All th e classes in the same DEX file share field, method, etc if they are same.           ● Classes from the same DEX file are l...
Read more

How To Run Compatibility Test Suite (CTS) ?

Image
How does the CTS work? The CTS is an automated testing harness that includes two major software components: The CTS test harness runs on your desktop machine and manages test execution. Individual test cases are executed on attached mobile devices or on an emulator. The test cases are written in Java as JUnit tests and packaged as Android .apk files to run on the actual device target. Pre-Requirements : Linux System  Mobile or Emulator with User Build. Download   latest CTS. Download   CTS Media files. Download   Android SDK for Linux and keep it ready.  Setup the System for CTS: 1.Create 3 folders in your system root directory.  CTS CTS_Media ADT 2. Extract and  Copy   downloaded CTS files into the   CTS   folder which you have created now . It will have below folder structure             android-cts               ...
Read more

What is the directory structure of android AOSP root tree?

Image
  This is short version of what you will find when you download the Android source. I will leave out some minor directories and dig deeper into a couple of the important ones. Basically what you will get (based on the (Kit Kat - 4.4.4), in alphabetical order: Bionic   - the C-runtime for Android. Note that Android is not using glibc like most Linux distributions. Instead the c-library is called bionic and is based mostly on BSD-derived sources. In this folder you will find the source for the c-library, math and other core runtime libraries. Bootable   - boot and startup related code. Some of it is legacy, the fastboot protocol info could be interesting since it is implemented by boot loaders in a number of devices such as the Nexus ones. Build   - the build system implementation including all the core make file templates. An important file here is the envsetup.sh script that will help you a lot when working with the platform source. Running this scrip...
Read more