How to Send an Integer Array Between Activities in Android?

Incorrect Array Transfer with Intent.putExtra

Problem:
An array of integers is being sent from Activity A to Activity B using Intent.putExtra. However, in Activity B, the array is received as '0'.

Background:
Intent.putExtra() is commonly used to send small data types like strings, integers, and doubles between activities. However, it is not directly applicable to arrays.

Incorrect Approach:

<code class="java">i.putExtra("numbers", array);</code>

Issue:
The above code attempts to put an integer array into the intent as an integer. This is incorrect because an array cannot fit into a single integer.

Correct Approach:

To send an array using Intent.putExtra, it must be converted to a form that can be stored as a single value. This can be achieved by using the getIntArray() and putExtraIntArray() methods.

<code class="java">// Sending array from Activity A
i.putExtra("numbers", array);

// Receiving array in Activity B
int[] arrayB = extras.getIntArray("numbers");</code>

Additional Notes:
Ensure that both activities have identical array declarations to avoid runtime errors. It is also good practice to check if the intent contains the expected extra before accessing it.

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