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To write an app you are going to need to download and install Android Studio. Included in the download are the Software Development Kit, with all the Android libraries and bits that you need to develop an app; and the Android emulator, so that you can initially test you app on your PC without needing to install it on a real device.

However, first you are going to need to download and install the Java Development Kit (JDK) from Oracle. Look for the section called “Java SE Development Kit 7u79” and download the version for your PC. It is important that you download the right version (32-bit or 64-bit) because if you don’t you can have problems with Android Studio not finding the Java Runtime Environment (JRE).