How is a variable declared in the Java programming language used for Android app development?

In Java for Android applications, declaring a variable is the same as in standard Java:

type variableName = value;

For example:

int count = 10;
String name = "Android";
boolean isActive = true;

Where:

• type — primitive (int, boolean, float, etc.) or reference (String, custom class, etc.)
• variableName — the identifier of the variable
• value — optional initial value

The scope of the variable depends on where it is declared: inside a method — local, inside a class — class field (static or instance).

In Android, it is also important to consider the lifecycle of components (Activity, Fragment) to properly manage the lifetime of variables and resources.