Get Google map API key: before using Google map API, you must generate Google map API key. & nbsp; to generate Google map API key, you need to use two tools: JDK keytool and Android debug mode keystore. &The keytool of JDK is usually located in% Java_ In the home% / bin directory, for example, under windows, in C: / / program files / Java / jdk1.6.0_ The keystore keystore in Android debug mode is located in the directory of C: / / users / Yang \. Android (Yang is the computer user name).