[Q] Help using Android command line dev tools

I'm trying to deconstruct the Android app development process by creating and installing a sample app entirely from the command line (without even using Ant). I've composed a script which seems to work until the very last command, at which point I get the message
134 KB/s (10496 bytes in 0.076s)
pkg: /data/local/tmp/MyActivity-debug.apk
Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES]

Please don't be put off by the fact that my script is a Windows .bat script. I'm just calling code from the SDK's tools and platform-tools directories. Anyway, here's the script. If find what I'm missing that's giving me the NO_CERTIFICATES error, please reply...

call "c:\program files (x86)\Android\android-sdk\tools\android" create project --target 10 --name MyAndroidProject --path c:\MyProjects\MyAndroidProject --activity MyActivity --package com.allmycode.samples

cd \MyProjects\MyAndroidProject

mkdir C:\MyProjects\MyAndroidProject\res
mkdir C:\MyProjects\MyAndroidProject\libs
mkdir C:\MyProjects\MyAndroidProject\bin
mkdir C:\MyProjects\MyAndroidProject\gen
mkdir C:\MyProjects\MyAndroidProject\bin\classes

"C:\Program Files (x86)\Android\android-sdk\platform-tools\aapt.exe" package -f -m -M C:\MyProjects\MyAndroidProject\AndroidManifest.xml -S C:\MyProjects\MyAndroidProject\res -I "C:\Program Files (x86)\Android\android-sdk\platforms\android-9\android.jar" -J C:\MyProjects\MyAndroidProject\gen

"c:\program files\java\jdk1.7.0\bin\javac" -d C:\MyProjects\MyAndroidProject\bin\classes -classpath C:\MyProjects\MyAndroidProject\bin\classes;C:\MyPr ojects\MyAndroidProject;c:\ant\lib\ant-launcher.jar;"C:\Program Files (x86)\Java\jre6\lib\ext\QTJava.zip";C:\ant\lib\ant-antlr.jar;C:\ant\lib\ant-apache-bcel.jar;C:\ant\lib\ant-apache-bsf.jar;C:\ant\lib\ant-apache-log4j.jar;C:\ant\lib\ant-apache-oro.jar;C:\ant\lib\ant-apache-regexp.jar;C:\ant\lib\ant-apache-resolver.jar;C:\ant\lib\ant-apache-xalan2.jar;C:\ant\lib\ant-commons-logging.jar;C:\ant\lib\ant-commons-net.jar;C:\ant\lib\ant-jai.jar;C:\ant\lib\ant-javamail.jar;C:\ant\lib\ant-jdepend.jar;C:\ant\lib\ant-jmf.jar;C:\ant\lib\ant-jsch.jar;C:\ant\lib\ant-junit.jar;C:\ant\lib\ant-junit4.jar;C:\ant\lib\ant-netrexx.jar;C:\ant\lib\ant-swing.jar;C:\ant\lib\ant-testutil.jar;C:\ant\lib\ant.jar;"C:\Program Files\Java\jdk1.7.0\lib\tools.jar" -sourcepath C:\MyProjects\MyAndroidProject\src;C:\MyProjects\M yAndroidProject\gen -target 1.5 -bootclasspath "C:\Program Files (x86)\Android\android-sdk\platforms\android-9\android.jar" -encoding UTF-8 -g -source 1.5 c:\MyProjects\MyAndroidProject\src\com\allmycode\s amples\*.java

call "C:\Program Files (x86)\Android\android-sdk\platform-tools\dx.bat" --dex --output=C:\MyProjects\MyAndroidProject\bin\classes. dex C:\MyProjects\MyAndroidProject\bin\classes

"C:\Program Files (x86)\Android\android-sdk\platform-tools\aapt.exe" package -f --debug-mode -M C:\MyProjects\MyAndroidProject\AndroidManifest.xml -S C:\MyProjects\MyAndroidProject\res -I "C:\Program Files (x86)\Android\android-sdk\platforms\android-9\android.jar" -F C:\MyProjects\MyAndroidProject\bin\MyActivity-debug-unaligned.apk

"C:\Program Files (x86)\Android\android-sdk\tools\zipalign.exe" -f 4 C:\MyProjects\MyAndroidProject\bin\MyActivity-debug-unaligned.apk C:\MyProjects\MyAndroidProject\bin\MyActivity-debug.apk

start "Launch an emulator" "C:\Program Files (x86)\Android\android-sdk/tools/emulator.exe" -avd Gingerbread

timeout /T 60

"C:\Program Files (x86)\Android\android-sdk\platform-tools\adb.exe" install -r C:\MyProjects\MyAndroidProject\bin\MyActivity-debug.apk

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