Java Essentials for Android

To get involved Android development, here are the concepts in Java you should learn

• Classes and Objects
• Inner Classes
• Access Members (Public, Private, Protected etc)
• Scope (Static Scope, Instance Scope, etc)
• Exceptions Handling
• Thread and Concurrency Control
• Array
• String
• Date Time
• Annotation
• Auto Boxing and Auto Unboxing
• Collections
• Generics
• File I/O
• Reflection
• Interfaces 

Related Books :

• Learn Java for Android Development

Related Tutorials : 

• http://mobile.tutsplus.com/tutorials/android/java-tutorial/
• http://mobile.tutsplus.com/tutorials/android/learn-java/
• http://mobile.tutsplus.com/tutorials/android/instanceof/
• http://mobile.tutsplus.com/tutorials/android/java-arrays/
• http://mobile.tutsplus.com/tutorials/android/java-reflection/
• http://mobile.tutsplus.com/tutorials/android/android-java-iteration-challenge/
• http://mobile.tutsplus.com/tutorials/android/java-inner-classes/
• http://mobile.tutsplus.com/tutorials/android/java-inner-classes_android/
• http://mobile.tutsplus.com/tutorials/android/javadoc/
• http://mobile.tutsplus.com/tutorials/android/java-strings/
• http://mobile.tutsplus.com/tutorials/android/java_android_date-and-time/
• http://mobile.tutsplus.com/tutorials/android/learn-java_strings_challenge/
• http://mobile.tutsplus.com/tutorials/android/java_shorthand/ 
• http://stackoverflow.com/questions/5605575/why-android-used-java-concept-instead-of-d-language-or-c-or-c-but-chromium-we