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on linux with emacs

  * install sdk + use it to install runtimes etc: http://developer.android.com/sdk/installing.html
  * useful but a bit out of date: http://riddell.us/AndroidWithEmacsOnUbuntu.html
  * (install everything to ~/opt and set up paths)

setting up the hardware:
  * enable debugging on device
  * set permissions on usb device by creating /etc/udev/rules.d/51-android.rules (0bb4 is htc vendor):

  SUBSYSTEM=="usb", SYSFS{idVendor}=="0bb4", MODE="0666"

test it works with:

  adb devices

creating a project (from http://developer.android.com/guide/tutorials/hello-world.html ):
  
  android create project \
    --package com.android.helloandroid \
    --activity HelloAndroid \ 
    --target 2 \
    --path <path-to-your-project>/HelloAndroid 

Use "android list targets" to get the target number

Load a file into emacs, M-X android-ant-install, and the package should appear in your apps list

Sidestepping java with the NDK: http://mindtherobot.com/blog/452/android-beginners-ndk-setup-step-by-step/

Building ndk sources by putting the ndk directory on your path and running 

  ndk-build
  
Compiler flags are in Android.mk, debug options are set by the java project, add:

  android:debuggable="true"
  
To the application properties in the manifest.

Writing to the sdcard from the ndk - you can just use fopen("/sdcard/newfile.txt") but you need to remember to add:

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

To the manefest.

Debugging on emulator - in order to find the symbols first run:

  set solib-search-path /path/to/your/project/obj/local/armeabi 
  
Or, alternatively use addr2line to convert a crash address to the source location:

   adb logcat
   (... lots of stuff including stack trace ...)
   addr2line -e libfoo.so deadbeef