Android 機，開啟開發者身份(Be a developer for your Android device)

開啟安卓裝置的開發者身份，以裝置作APP的測試

找 設定 》關於手機 》版本號碼，按到出現 "你已經是開發人員" 就可以

If you want to enable the developer mode in your Android device for testing your App, please follow the step below

1. Find Build number

Stock Android: Settings > About phone > Build number

Samsung Galaxy S5: Settings > About device > Build number

LG G3: Settings > About phone > Software information > Build number

HTC One (M8): Settings > About > Software information > More > Build number

2. Keep pressing the Build number, until you see "You are now a developer".

Source: http://www.greenbot.com/article/2457986/how-to-enable-developer-options-on-your-android-phone-or-tablet.html