Can't seem to generate an APK from ionic proje

i am new to ionic, trying to get an apk for debugging i used the following commands inside the project directory:

ionic cordova platform add android

i did get "platforms/android" directory

and then i used:

ionic cordova build android

this is what i get after:

     ionic-app-scripts build --target cordova --platform android
[23:57:19]  ionic-app-scripts 3.1.10
[23:57:19]  build dev started ...
[23:57:19]  clean started ...
[23:57:19]  clean finished in 10 ms
[23:57:19]  copy started ...
[23:57:19]  deeplinks started ...
[23:57:19]  deeplinks finished in 36 ms
[23:57:19]  transpile started ...
[23:57:27]  transpile finished in 8.13 s
[23:57:27]  preprocess started ...
[23:57:27]  preprocess finished in less than 1 ms
[23:57:27]  webpack started ...
[23:57:28]  copy finished in 8.97 s
[23:57:35]  webpack finished in 7.63 s
[23:57:35]  sass started ...
Without `from` option PostCSS could generate wrong source map and will not find Browserslist config. Set it to CSS file path or to `undefined` to prevent this warning.
[23:57:40]  sass finished in 4.83 s
[23:57:40]  postprocess started ...
[23:57:40]  postprocess finished in 28 ms
[23:57:40]  lint started ...
[23:57:40]  build dev finished in 20.79 s
[23:57:44]  lint finished in 3.91 s
> cordova build android

You have been opted out of telemetry. To change this, run: cordova telemetry on.
Android Studio project detected
(node:12696) UnhandledPromiseRejectionWarning: CordovaError: Failed to find 'ANDROID_HOME' environment variable. Try setting it manually.
Failed to find 'android' command in your 'PATH'. Try update your 'PATH' to include path to valid SDK directory.
    at C:\Users\h2001\Desktop\myApp\platforms\android\cordova\lib\check_reqs.js:305:19
    at _fulfilled (C:\Users\h2001\Desktop\myApp\platforms\android\cordova\node_modules\q\q.js:854:54)
    at self.promiseDispatch.done (C:\Users\h2001\Desktop\myApp\platforms\android\cordova\node_modules\q\q.js:883:30)
    at Promise.promise.promiseDispatch (C:\Users\h2001\Desktop\myApp\platforms\android\cordova\node_modules\q\q.js:816:13)
    at C:\Users\h2001\Desktop\myApp\platforms\android\cordova\node_modules\q\q.js:877:14
    at runSingle (C:\Users\h2001\Desktop\myApp\platforms\android\cordova\node_modules\q\q.js:137:13)
    at flush (C:\Users\h2001\Desktop\myApp\platforms\android\cordova\node_modules\q\q.js:125:13)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)
(node:12696) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:12696) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

but i didn't get the promised \build\outputs\apk, what is the problem?

UPDATE: i installed android studio and updated it, still getting

(node:12696) UnhandledPromiseRejectionWarning

UPDATE: the problem was solved, turns out i had java10 which wont work with android, simply installing java8 solved the problem

回答1:

btw, i dont have android sdk installed if that makes any difference?

You have answered your own question. To make an Android APK

You need Java SDK 1.8.
Android SDK with latest build tools and platforms
JAVA_HOME & ANDROID_HOME environmental variables set correctly.

Also You need updated X-Code on a Mac to create an IPA.

回答2:

You probably doesn't have android environment variable in your PC. if you are running MAC try running:

sudo export ANDROID_HOME=/<installation location>/android-sdk-macosx
sudo export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

If you are running Linux then:

export ANDROID_HOME=/<installation location>/android-sdk-linux
export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

And if you are running Windows then open your command prompt as Administrator and run:

set ANDROID_HOME=C:\<installation location>\android-sdk-windows
set PATH=%PATH%;%ANDROID_HOME%\tools;%ANDROID_HOME%\platform-tools

It will add enviroment variable to your system.