I’ve been playing with React Native now for 7 months, since April 2015. Geez… has it really been that long already? Time sure flies when you’re… uh… you know!

Up until now, I’ve been happy to develop my iOS app alone, pushing Android off to the future. But that changed when I came across a call for help on Stack Overflow this past weekend titled ‘Unable to download JS bundle’ error on Android 4Intrigued, I decided to setup my Android environment and see if I had any better luck (spoiler alertL I didn’t… have any better luck that is). But I did document every step of my experience, and here I lay it out for your pleasure… every gruesome detail.

Start Time: 11:45a

  • I start with the official documents for Android Setup, only seems logical
  • Install JDK (version 8u65 for Mac OS X x64)
  • Install Android SDK
    <span style="color: #993300;">$ brew install android-sdk</span>
  • Define ANDROID_HOME in ~/.bashrc or in my case ~/.zshrc, I added the following to the end of the file.
    <span style="color: #993300;">export ANDROID_HOME=/usr/local/opt/android-sdk</span>
  • Configure SDK  – in a fresh shell, type android then add the following packages. This took some time, maybe 30 minutes?
    • Android SDK Build-tools version 23.0.1
    • Android 6.0 (API 23)
    • Android Support Repository
    • Received this warning, so I followed the instructions
      01 - Android Tools Updated
    • I reopened the manager window by typing android again with no further problems.
    • However, upon opening the already installed Eclipse, I received this warning.
      02 - Install Java SE 6
    • Clicking the “More Info” took me to an Apple support article (pictured below) where I downloaded javaforosx.dmg, which installed easily
      03 - javaforosx
    • Eclipse Never Runs – I can see the eclipse icon appear in my taskbar, then disappear. Tried twice, rebooted, tried again with no luck. I take a note to look into this later, but moving on for now.

Time Check: 12:40p

  • Install Genymotion – This is the android emulator. I grab free for personal use version genymotion-2.5.2 for Mac. Installing requires the typical drag to applications, except I’m dragging both the app plus cli shell icons.
  • Run Genymotion – Upon opening the app, I get this error. Apparently I should have red the install guide which would have told me that I needed to install Oracle VM VirtualBox first.
    04 - Oracle VM Virtual Box Dependency
  • Install Oracle VM Virtual Box for Mac OSX
    • Download and install VirtualBox for OS X from the Download VirtualBox page (VirtualBox-5.0.8-103449-OSX.dmg).
      When installing VirtualBox, in the Custom setup window, make sure VirtualBox Networking is enabled.
    • Reboot and run VirtualBox from the Application Directory
  • Run Genymotion then Add A Virtual Box – I Added a MotoX 4.4.4 since this is what I own. Took just a few minutes to configure.
  • Try to Emulate Something (FAIL!) – with genymotion emulator open 
    <span style="color: #993300;">$ react-native init deletable
    $ cd deletable
    $ react-native run-android</span>

05 - Android Build Failed

  • Installed Android SDK Build Tools – this is where I apparently just screwed up. Firstly, I remember clicking on the build tools at the Configure SDK step above, but for some reason it didn’t install. My best guess is that I didn’t accept all the licenses correctly. In any case this time, I installed both Android SDK Build-tools 23.0.1 && 23.0.2 since it’s available.
  • Try to Emulate Something (SUCCESS!) – It worked! It took 1 minute 21 seconds to build, which is dagnabit slow, but it worked in the emulator! Apparently I can make the builds run faster by installing the Gradle Daemon, but I’ll save that for another time.

Time Check: 2:25p

I’m finally to the point where I can attempt to duplicate the stack overflow issue  ‘Unable to download JS bundle’ error on Android 4These are the instructions I followed, which were what was live at the time I did this (fyi: they’ve been updated since to be more clear)

06 - Connect to Device Instructions for React Native

Before I could even get started on these instructions, I had to first understand the nomenclature. The author is clearly making assumptions about what he/she thinks I already know, but I am totally new to Android development and have to start from square one.

  • What’s a rage shake menu?
    I had to research what the “rage shake” was to ensure I understood. As it turns out, both Facebook and Google use this feature to send debug info to their testers from the wild. My phone, however uses the rage-shake to start the camera. Once I disabled that for the camera, it still didn’t open the “rage shake menu”
  • What is adb?
    This turns out to be the Android Debug Bridge, a CLI tool for debugging.
  • How do I run adb?
    I started by typing adb in the terminal. Success! I was given a list of valid commands.

Ok, so now I felt like I understood the language and understood the tools enough to get started on this. Referring back to the docs image above, the first step in configuring device to connect to the dev server via wifi was “Open rage shake menu (shake the device) or run adb shell input keyevent 82.

I shook the hell out of my phone, but rage shake didn’t work for me. On the MotoX, I can start the camera at anytime by shaking my phone, so I disabled that feature to test this. I had no luck. So, I was left figuring out how to send the adb command to my phone.

As I said earlier, when I typed adb <enter> in the terminal, I was shown a list of available commands. One of the commands was adb devices which showed me all connected devices. I gave it a try and got this response…

07 - ADB Response

At this point, I had no idea whether that was my wifi connected device or the emulator. I’m not even clear what a device has to do to become “connected” or what “connected” means. But, I figure that if I issued the keyevent, it would get sent to this device, so I gave it a try.

<span style="color: #993300;">adb shell input keyevent 82 </span>

This opened the dev menu in the emulator. Ok, that answers the question as to whether it was my device or the emulator. I see the option for Dev settings > debug server host for device (Steps 2 & 3), so I entered the local IP of my local machine as instructed (, then…

08 - Deletable Has Stopped

App Crashed – immediately after closing the menu, the emulated app crashed. It’s no surprise really. I didn’t expect it to work. But I thought I’d give it a try just in case. When you’ve never seen it work correctly, you just don’t have any idea whether you’re on the right track or not. I clearly wasn’t.

Try to Undo – I’ve no idea how to undo the debug server settings. I tried restarting the simulator, restarting the packager, restarting the simulator, restarting genymotion, and finally just deleted the emulator from genymotion, shut everything down, and started building it all up from the beginning. This worked, thank gawd!

Try Connecting my Wifi Device – my next thought was to try and figure out how to connect my device. I found my device IP address (settings > phonen info > status > IP address) and thinking I could use the adb connect with IP address to connect, I tried this…

<span style="color: #993300;">adb connect </span>

FAIL! The result was unable to connect to (scratches head!)

Thankfully, Brent Vatne and Martin Konicek were helpful on twitter and clued me in that I’d need to have the app open on the device before issuing the keyevent 82. That makes sense, but how? Scrolling up to the top of the Running on device page is instructions on connecting via USB that I had been ignoring till now because I didn’t want to connect via USB, I wanted to connect via Wifi. In any case, once I figured that out, I connected my device via USB (making sure to have usb debugging enabled) and ran the command again. And again it failed with the error: more than one device and emulator. Apparently you can only have one device connected at a time, so I quit the emulator and built again…

<span style="color: #993300;">react-native run-android

09 - Unable to download JS bundle

I tried and tried, but never was able to get the app to build on the device itself. I verified it works in the emulator again before throwing in the towel for the night.

Finished: 7p

In Summary, it took me 2 hours and 40 minutes to configure my machine for Android. As you can see from the screenshot above, I was still working on this at 7p, which means I’ve invested close to 8 hours trying to get a simple Android build to run on my device. Unfortunately, I wasn’t successful in the end, but I learned a lot in the journey. And I’m sure the core team will get this fixed. They’re a great, hard working group.



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