steven7's profile - activity

Hi I am trying to develop an application for TurtleBot I am trying to run the tutorial from android_core. First of all, the android_tutorial_pubsub seems to work fine as when I enter my master URI the app does respond with Hello World and the timer.

But then I encountered some problem on android_tutorial_teleop. At first when I touch the virtual joystick I received NullPointerException and the app crashes. I somehow fixed it by adding a line guided by one user here. But then even when I move the joystick around, the TurtleBot is unresponsive. Therefore I am wondering where is the problem? Do I have to run some commands first on the TurtleBot laptop and android_tutorial_teleop doesn't work on TurtleBot? I did follow the tutorial on TurtleBot bringup but to no help so far.

I received the NullPointerException like the other guy http://answers.ros.org/question/44427/android-tutorial-teleop-problems/ here encountered. Anyway I tried adding the line in different location by trial and error and it seems like the joystick can now move but another issue arises. T

Hi guys, I am trying to run this example after successfully installing and building both rosjava_core and android_core. Then I am able to "import" the project to Eclipse and install it on my emulator with no error. However, whenever I touches the area around the joystick, the app crashes. This happens on my actual Android device as well (ASUS Eee Pad Transformers, with Android 4.0.6).

Does anyone how to solve the problem?

P/S: I do some diggings and one guy have the same problem but he solve it by adding the line currentVelocityCommand =publisher.newMessage();. I did try this method but the app crashes as well, maybe I added the line at the wrong place in VirtualJoystickView?

Hello,i also facing the same problem. can you mention the step to explicitly included android_gingerbread on the build path of android_tutorial_pubsub instead of just letting eclipse grab references from the open project.

I have been trying to set up an environment for developing an ROS Android application for some time but have no luck so far. I followed the tutorial Installing/building rosjava_core & android_core and got kinda stuck on the last step.

After successfully execute ./gradlew debug I tried to create a new Android Project from existing code by browsing to the "android_tutorial_teleop". Then I add all of the jars in the libs directory to the project build path by "Configuring Build Path". But there are still lots of error at my MainActivity.java where the import failed (cannot be resolved) with the "red lines" below them. Any ideas where I did wrong and how to solve them.

Hi guys, I am trying to set up the environment for developing a ROS Android application and I followed the tutorial here and I got stuck when I tried to rosmake "android_app_chooser". At first I get the error "Failed to find stack for package actionlib_java", but then by following the tutorial to downgrade the rosjava_android repository seems to have solve the error.

So I run the rosmake command again, but this time I get another error "Failed to find rosdep daemontools for package android_app_chooser on OS:ubuntu version:lucid [ rosmake ] rosdep install failed: Rosdep install failed ". Can anyone tell me where I did wrong and help me solve the problem?

Edit1:By the way, by browsing through other questions here I found some proposed solution such as running sudo apt-get install ros-electric-turtlebot but to no success as when I tried to run sudo-apt-get install daemontools it says my daemontools is already the latest version.

P/S: Honestly I have tried few approaches on setting up such environment but to no success so far. I would really appreciate if someone can upload a VM image that can run the android examples as well as developing one. Thanks a lot.

Hi guys, I am really new to ROS but currently I am required to learn how to develop a custom Android App for TurtleBot. The thing is, I followed this page and got kinda lost as I have very less exposure on Linux. The commands used in the tutorial and the instructions are kinda new and advanced to me.

My question is, is it possible to develop such Android App for TurtleBot using Eclipse in Windows or Linux environment, though I prefer Windows environment. If so, would someone mind giving me some step-by-step guidance?