ionic4安卓真机调试

首先数据线连接电脑，，找到开发者选项打开usb调试，，
测试：在电脑上打开360手机助手，用手机打开360手机助手，用电脑连接手机，看是否成功。
执行命令：ionic run android -l -c

$  ionic run android -l -c
[WARN] Cordova engine chosen without a target platform. This could cause issues. Please use the --platform option.
> ng run app:ionic-cordova-build
Could not find module "@ionic/ng-toolkit" from "E:\\6------Project-framework\\ionic-demo".
Error: Could not find module "@ionic/ng-toolkit" from "E:\\6------Project-framework\\ionic-demo".
    at Object.resolve (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\core\node\resolve.js:141:11)
    at Observable.rxjs_1.Observable [as _subscribe] (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\architect\src\architect.js:132:40)
    at Observable._trySubscribe (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:43:25)
    at Observable.subscribe (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:29:22)
    at DoOperator.call (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\operators\tap.js:29:23)
    at Observable.subscribe (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\Observable.js:24:22)
    at C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\util\subscribeTo.js:22:31
    at Object.subscribeToResult (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\util\subscribeToResult.js:7:45)
    at MergeMapSubscriber._innerSub (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:75:38)
    at MergeMapSubscriber._tryNext (C:\Users\zt\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\rxjs\internal\operators\mergeMap.js:72:14)
[ERROR] An error occurred while running subprocess ng.

        ng run app:ionic-cordova-build exited with exit code 1.

        Re-running this command with the --verbose flag may provide more information.

报错
命令应该是ionic cordova run android -l -c，并且用cmd运行，注意应该把手机之前的测试安装包删掉。
成功之后，手机上就自动安装了项目包

打开chrome://inspect/#devices网页，手机连接电脑之后，界面显示

点击inspect，就会打开调试界面，（注意打开调试界面的时候必须）

这样就是成功了！！！！！