When it comes to java coding for app development, the world has seen a significant shift towards Android. With a dominant market share, Android stands tall amongst all mobile operating systems, which has led to an increased demand for Android developers and hence, an understanding of java in Android app development is essential.

1. Java Syntax

The first and foremost requirement for any developer is to have a solid understanding of the language syntax. Java syntax is the set of rules defining how a Java program is written and interpreted. The syntax includes variables, data types, and how to declare them. It also covers control structures like loops and conditionals.

2. Object-Oriented Programming (OOP)

To effectively use java in mobile application development, a comprehensive understanding of OOP principles is essential. Java is an object-oriented language, and Android uses Java to build parts of the apps, like activities and services. Understanding classes, objects, inheritance, polymorphism, and encapsulation is critical.

3. Java Core Libraries

For efficient Java android programming, knowing Java's core libraries is beneficial. These libraries provide reusable functions, classes, and methods that simplify the process of app development. Libraries like java.util, java.io, and java.net are commonly used in Android development.

4. Understanding of XML

While XML is not a basic fundamental of Java, it is a crucial tool in Android app development. XML is used to create layouts that form the user interface in Android apps. A solid understanding of XML, how it works with Java, and how to use it effectively in app development is a must.

5. Java Memory Management

Java's memory management is one of its key features, making it suitable for Android development. Developers need to understand how Java handles memory management and garbage collection, and how it impacts the performance of the app.

In conclusion, mastering Java fundamentals is the key to successful Android app development. Whether you're a novice or a seasoned developer, brushing up on these skills will undoubtedly be beneficial.

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Remember that mastering Java coding for app development is a journey. These fundamentals are just the starting point. As you delve deeper into Android development, you'll encounter more complex concepts. Keep learning and updating your skills constantly to stay current with the rapid advancements in technology.