The following is the first few sections of a chapter from Exploring Android, plus headings for the remaining major sections, to give you an idea about the content of the chapter.
First, let us get you set up with the pieces and parts necessary to build an Android app. Specifically, in this tutorial, we will set up Android Studio.
Compiling and building an Android application, on its own, can be a hardware-intensive process, particularly for larger projects. Beyond that, your IDE and the Android emulator will stress your development machine further. Of the two, the emulator poses the bigger problem.
The more RAM you have, the better. 8GB or higher is a very good idea if you intend to use an IDE and the emulator together. If you can get an SSD for your data storage, instead of a conventional hard drive, that too can dramatically improve the IDE performance.
A faster CPU is also a good idea. The Android SDK emulator, as of 2016, supports CPUs with multiple cores — previously, it only supported a single core. However, other processes on your development machine will be competing with the emulator for CPU time, and so the faster your CPU is, the better off you will be. Ideally, your CPU has 2 to 4 cores, each 2.5GHz or faster at their base speed.
There are two types of emulator: x86 and ARM. These are the two major types of CPUs used for Android devices. You really want to be able to use the x86 emulator, as the ARM emulator is extremely slow. However, to do that, you need a CPU with certain features:
|Development OS||CPU Requirements|
|Windows||an Intel CPU with support for VT-x, EM64T, and “Execute Disable” (XD)|
|Linux||an Intel CPU with support for VT-x, EM64T, and “Execute Disable” (XD), or an AMD CPU with support for AMD-V|
Also, at least for newer API levels, your CPU must support SSSE3 extensions, though the details of this requirement are not documented as of October 2017.
If your CPU does not meet those requirements, you will want to have 1+ Android devices available to you, so that you can test on hardware.
Also, if you are running Windows or Linux, you need to ensure that your computer’s BIOS is set up to support Intel’s virtualization extensions. Unfortunately, many PC manufacturers disable this by default. The details of how to get into your BIOS settings will vary by PC, but usually it involves rebooting your computer and pressing some function key on the initial boot screen. In the BIOS settings, you are looking for references to “virtualization” or “VT-x”. Enable them if they are not already enabled. macOS machines come with virtualization extensions pre-enabled.
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