Android Studio 'tools.jar' file is not present in classpath

Check if java JDK is installed correctly

dpkg --list | grep -i jdk

if not install JDK

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update && sudo apt-get install oracle-jdk7-installer

After the installation you have enable the jdk

update-alternatives --display java

Check if Ubuntu uses Java JDK 7

java -version

If all went right the answer should be something like this:

java version “1.7.0_25″
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) Server VM (build 23.3-b01, mixed mode)

Check what compiler is used

javac -version

It should show something like this

javac 1.7.0_25

Add JAVA_HOME to environment variable

Edit /etc/environment and add JAVA_HOME=/usr/lib/jvm/java-7-oracle to the end of the file

sudo nano /etc/environment

Append to the end of the file

JAVA_HOME=/usr/lib/jvm/java-7-oracle

Log in and out (or reboot) for the changes to take effect.

If you want to remove oracle JDK

sudo apt-get remove oracle-jdk7-installer

read this: http://arwankhoiruddin.blogspot.co.il/2014/01/android-studio-in-ubuntu-problem.html

in short: type at the terminal

$ sudo update-alternatives --config java

now you need to choose

usr/lib/jvm/java-7-openjdk/jre/bin/java

by pressing #3

I have Ubuntu 14.04 and OpenJDK and for me a fresh install worked.

just did

sudo apt-get install openjdk-7-jdk

or,

sudo apt-get install --reinstall openjdk-7-jdk if it is already installed and giving error,

and everything was fine.

On ubuntu I have tried all the methods that are described here but none worked.

What I did in the end was to:

download JDK from oracle and extract the archive
edit android-studio/bin/studio.sh and add at the top

export JAVA_HOME=/path/to/jdk
save the file and cd android-studio/bin and launch Android Studio: ./studio.sh

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