解決React Native安裝應用到真機（紅米手機）報Execution failed for task ':app:installDebug'的錯誤

報錯資訊如下：

:app:installDebug

Installing APK 'app-debug.apk' on 'Redmi 3S - 6.0.1'

Unable to install D:\ReactNative-Workspace\FirstRNProject\android\app\build\outp

uts\apk\app-debug.apk

com.android.ddmlib.InstallException: Failed to establish session

at com.android.ddmlib.Device.installPackages(Device.java:894)

at com.android.builder.testing.ConnectedDevice.installPackages(Connected

Device.java:113)

........ 中間一大堆報錯資訊省略 .........

:app:installDebug FAILED

FAILURE: Build failed with an exception.

What went wrong:

Execution failed for task ':app:installDebug'.

com.android.builder.testing.api.DeviceException: com.android.ddmlib.InstallExc eption: Failed to establish session

一直跳錯誤資訊：

解決過程：手機型号（紅米3S，系統MIUI 8）；先檢查了一下開發者選項，USB調試、未知源 都是開啟的；

然後發現 “啟用MIUI優化”這一項是開啟的，把它關掉（設定----更多設定----開發者選項----啟用MIUI優化 關閉）

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