![]() When you call a method with a variable number of arguments, an array is created to pass all the arguments and since the type of that array can not be parameterized, an unchecked assignment has to be made. ![]() But at runtime, generic types have been erased and the array can not differentiate a Pair from a Pair, leading to potential heap pollution and breaking the array contract. ![]() This is forbidden because Java arrays are covariant and they check the type of values written to them at runtime. Does NOT compile Pair array = new Pair // Compiles with warning: "Unchecked assignment" Pair array = new Pair The reason behind that warning is that Java does not allow creating arrays of parameterized types. makeSceneTransitionAnimation( this, elem1, elem2) ![]() Compiles with warning: // "unchecked generics array creation for varargs parameter" ActivityOptions. The first problem you’ll notice is that, no matter which arguments you pass to this method, the compiler will always show a warning message. There are 2 reasons why this method call is made difficult. ![]() makeSceneTransitionAnimation( this, Pair. A typical call forces me to write code looking like this: "unchecked") Bundle options = ActivityOptions. sharedElements)Ī similar method is also available in the Android support library. ActivityOptions makeSceneTransitionAnimation ( Activity activity, Pair. The Java method I want to discuss is part of the Android API designed to launch Activity transitions with shared elements. ![]()
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