android入门（1）安装及hello world
1. 下载安装jdk+eclipse+adt+android_sdk, 参考http://developer.android.com/sdk/index.html
2。编写helloworld，参考http://developer.android.com/resources/tutorials/hello-world.html
注意一点，如果编译时出错，
Android Emulator is not starting showing “ invalid command-line parameter”
http://stackoverflow.com/questions/6638713/android-emulator-is-not-starting-showing-invalid-command-line-parameter
http://stackoverflow.com/questions/6629273/android-emulator-invalid-command-line-parameter
----Q1-----
-download android sdk
- run AVD Manager
Install a Platform
Create an AVD
Create a New Android Project
- 安装adt（http://developer.android.com/sdk/eclipse-adt.html#installing）
Help > Install New Software....
https://dl-ssl.google.com/android/eclipse/
Configuring the ADT Plugin
Window > Preferences...
Select Android from the left panel.
For the SDK Location in the main panel, click Browse... and locate your
downloaded SDK directory.
Click Apply, then OK.
----Q2-----
[2012-03-04 12:58:12 - Emulator] PANIC: Could not open: C:\Documents and
Settings\Administrator\.android/avd/avd231.ini
http://code.google.com/p/android/issues/detail?id=19084
As a work-around, you can define the environment variable ANDROID_SDK_HOME to
point to the directory containing your .android directory. The emulator and SDK
Manager will pick it up properly.
Will look into this. There is likely a difference between the way the SDK Manager and
emulator pick up the user's directory when this variable is not defined.
set ANDROID_SDK_HOME=e:
start G:\soft\eclipse-java-indigo-win32\eclipse\eclipse.exe
----Q3-----
The adb tool has moved to platform-tools/
If you don't see this directory in your SDK,
launch the SDK and AVD Manager (execute the android tool)
and install "Android SDK
Platform-tools"
Please also update your PATH environment variable to
include the
platform-tools/ directory, so you can
execute adb from any location.
adb uninstall com.example.android.apis
Note：Before run the command,pls run the avd first