原因是连接了两个设备，所以无法启动，关掉一个即可
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com.android.builder.testing.api.DeviceException: com.android.ddmlib.InstallException: INSTALL_FAILED_UPDATE_INCOMPATIBLE:
【React Native】Execution failed for task ':app:installDebug'. > com.android.builder.testing.api.DeviceException: No online devices found.
React-Native 问题随记2： com.android.builder.testing.api.DeviceException
adb: failed to install app-debug.apk: Failure [INSTALL_FAILED_ABORTED: User rejected permissions]
com.android.ddmlib.AdbCommandRejectedException: device offline
com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK assets/com.xx.xx
uiautomatorviewer 连接真机的时候报 com.android.ddmlib.SyncException :Remote object doesn't exits!
【已解决】Error taking device screenshot: EOF和com.android.ddmlib.TimeoutException
Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncExceptio解决办法
uiautomatorviewer.bat报错：Error while obtaining UI hierarchy XML file: com.android.ddmlib.SyncExceptio