Which Java concepts required to learn android?

To develop android applications you should be having some knowledge in java i.e., OOPS concepts.If You know those concepts its gonna do well further. So, Be sure that you are comfortable with java concepts listed below.

• Understand what is class and object?
• What are the Methods available (No need to read all the methods. You just read whatever the methods we are regularly using in java)?
• Understand and do some basic examples on Inheritance(Write atleast 1 Program)
• Understand and do some basic examples on polymorphism(Write atleast 1 Program)
• Know What is Encapsulation?
• Understand and do some basic examples on abstraction(Write atleast 1 Program)
• What is Constructor and how many types of constructors?
• Understand overloading and overriding(Write atleast 1 Program for each)
• Read all String manipulations (do some examples on each on it).
• Do practice on Interfaces this is imp concept.
• Read and do some basic examples on ArrayList.
• You should have knowledge about Event Handling.(Write atleast 1 Program)
• Short introduction of  AWT, Swing and Applet.