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Need a “complete” understanding of Java for Android software applications?

I want to start developing applications for Android, and I was wondering if you can fill me with knowledge and requirements from a technical point of view.

I have installed SDK, Eclipse and Java, and even a phone for a "real" test.

My question is a complete Java lover and never used the language, how much java would I need to learn to develop Android applications?

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I would say that you can just start with some tutorials in the same way as with Java. You will learn along the way, just use a lot of tutorials.

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, Java, :

public static void main(String[] args){
    System.out.println("Hello World");
}

Android :

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    System.out.println("Hello World");
    // Or:
    Log.v("MyActivity", "Hello World");
}

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