Android NDK Eclipse Ubuntu 18.04 Installation Guide
How to Install Android NDK Eclipse Ubuntu 18.04 Bionic LTS GNU/Linux – Step by step Tutorial.
First, the Android NDK is a Toolset that allows you to Implement parts of your App using Native-Code Languages such as C and C++.
Moreover, on the Android NDK Eclipse Ubuntu Tutorial Bottom Link to Getting Started with Hello-World Android NDK Development on Eclipse.
Especially relevant: first you have to Install Android NDK and after Make the NDK Eclipse Integration Set-up.
Finally, the Contents and Details are Expressly Minimal to Give Focus Only to the Essentials Instructions and Commands ;)
 
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How to Install Android NDK on Ubuntu Linux 
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Then to Set-up Eclipse Android NDK Plugin source   Add the Software Source:   Like: https://dl-ssl.google.com/android/eclipse/ 
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After to Install the Eclipse Android NDK Plugin 
 Select the NDK Plugins Checkbox and Follow..  
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Again Select Eclipse > Window > Prefereces.   
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And finally Set Up Android NDK Path 
 Set or Browse for the NDK Installation Location:  
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Getting Started with Android NDK Code Development 
