1. Run Ionic Cordova build Android times wrong: Could not find a installed version of Gradle either in Android Studio.
2. Problem reason: Cordova after 6.4.0 (cordova-android in 6.1.2), will be asked to install Gradle, based on Gradle to compile, pack Android.
3. Workaround:
1) go to gradle official website: https://gradle.org/install
2) Download gradle:https://gradle.org/releases, I download here is the latest 4.0.2 version (Gradle-4.0.2-bin.zip);
3) Unzip, place the position oneself to decide;
4) Configure environment variables: System Variables--path--EDIT:
5) Check whether the installation succeeded: Gradle-v (need to reopen command-line tool)
6) Continue Ionic Cordova build Android
4. Then continue to encounter this problem:
1) IONIC3 Packaging error Ionic Cordova build Android (Series II): Your project path contains non-ascii characters:failed to apply plugin [id ' C Om.android.application ']
Reference Original: http://www.cnblogs.com/crazyprogrammer/p/6958462.html
IONIC3 Packaging Error Ionic Cordova build Android (series one): Could not find a installed version of Gradle either in Android Studio