最近在写一个小的Android程序的时候，由于之前是2.3的AVD,更换为2.2后，启动debug,AVD报错了~ 如下：

[2011-06-19 16:49:52 - HelloAndroid] Re-installation failed due to different application signatures.
[2011-06-19 16:49:52 - HelloAndroid] You must perform a full uninstall of the application. WARNING: This will remove the application data!
[2011-06-19 16:49:52 - HelloAndroid] Please execute 'adb uninstall org.xzx.helloandroid' in a shell.
[2011-06-19 16:49:52 - HelloAndroid] Launch canceled!

怎么都运行不了~看来得自己手动卸载，重装了~
得先找到 adb 的所在。

which adb,无果.查找一下，终于在 /usr/local/android-sdk-linux_x86/platform-tools/ 目录下找到了它，晕~这不是我安装android SDK 的地方么~

进入到 /usr/local/android-sdk-linux_x86/platform-tools/ 下，运行:
./adb uninstall xxx.xxx.xxx #具体为程序包名
即可。

再启动debug,一切OK了~

[2011-06-19 16:57:06 - HelloAndroid] Uploading HelloAndroid.apk onto device '040395381401C005'
[2011-06-19 16:57:06 - HelloAndroid] Installing HelloAndroid.apk...
[2011-06-19 16:57:13 - HelloAndroid] Success!