React native run stays in IDLE state

Issue

This is my first time setting up react native on Ubuntu 18.04 LTS. I have done the setup and I was trying to run the app on the device using the react-native run-android command. Here is the output what I get in terminal,

ron@lenovo:~/react/app$ react-native run-android
Scanning folders for symlinks in /home/ron/react/app/node_modules (9ms)
JS server already running.
Building and installing the app on the device (cd android && ./gradlew installDebug)...
Starting a Gradle Daemon, 1 busy Daemon could not be reused, use --status for details
NDK is missing a "platforms" directory.
If you are using NDK, verify the ndk.dir is set to a valid NDK directory.  It is currently set to /home/ron/Android/Sdk/ndk-bundle.
If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning.

File /home/ron/.android/repositories.cfg could not be loaded.
Checking the license for package Android SDK Build-Tools 26.0.3 in /home/ron/Android/Sdk/licenses
License for package Android SDK Build-Tools 26.0.3 accepted.
Preparing "Install Android SDK Build-Tools 26.0.3 (revision: 26.0.3)".
<=============> 100% CONFIGURING
> IDLE

It stays in this IDLE position forever. What is the fix or this issue?

Solution

The solution is to install Android SDK rev. 26.0.3. Your can install it from Android Studio's SDK Manager menu in File > Settings. Hope this helps.

Answered By - Ronald P Mathews