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Setup Build Environment (java)

if haven't installed yet,
sudo update-alternatives --install /usr/bin/java java /home/yliao/.../jdk1.5.0_22/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /home/yliao/.../jdk1.5.0_22/bin/javac 300

then, we can use these to change java version:
sudo update-alternatives --config java
sudo update-alternatives --config javac

there will create a link like:
/usr/bin/java -> /etc/alternatives/java /home/yliao/.../jdk1.5.0_22/bin/java
OR
/usr/bin/java -> /etc/alternatives/java/usr/lib/jvm/java-6-sun/jre/bin/java

Setup a new build environment for GTV on a 64-bit machine

Refer to:
http://blog.csdn.net/lqf20013/article/details/6362267

Android KeyEvent mapping

./frameworks/base/core/java/android/view/KeyEvent.java

Monitor CPU Usage (better than top)

mpstat -P ALL 1
This guy prints the usage and other stats of each core of cpu every 1 second.
PS: This is a busybox applet.