Mac Uninstall and install SDK

Today use as when encountered a problem, can not open tools-->android-->android Device Monitor, so after online random find, seemingly with the machine now installed JDK 9.0.1 conflict, the following to try:

The first step is to uninstall the current JDK

Input

• sudo rm-fr/library/internet\ plug-ins/javaappletplugin.plugin
• sudo rm-fr/library/preferencespanes/javacontrolpanel.prefpane
• sudo rm-rf/library/java/javavirtualmachines/jdk-9.0.1.jdk

Where you can find the current version by
Input: ls/library/java/javavirtualmachines/
Output: JDK-9.0.1.JDK

Step Two Install JDK1.8

After downloading the JDK, click Continue until finished.

You can see the jdk1.8 in the terminal input Open/library/java/javavirtualmachines

Mac automatically configures paths that do not need to be manually configured

Mac Uninstall and install SDK