CODEWITHSUNDEEP
javaandroidarraylist
Android
Android

Reputation: 171

Working with arraylist in java/android

I am little confused as to what -1 represents in the following arraylist. Can someone help me out please, thanks.

toyList.add(new toyStore(toyName[0], toyIcon.getResourceId(0, -1)));
toyList.add(new toyStore(toyName[1], toyIcon.getResourceId(1, -1)));

Upvotes: 0

Views: 192

Answers (3)

Mohammed Ali
Mohammed Ali

Reputation: 2926

getResourceId(0, -1) gives the resource Id at index 0 of toyIcon or it will return -1 if the attribute is not defined or not a resource.
In the docs 

public int getResourceId (int index, int defValue)
Parameters
index   Index of attribute to retrieve.
defValue    Value to return if the attribute is not defined or not a resource.
Returns
Attribute resource identifier, or defValue if not defined.

See this: http://developer.android.com/reference/android/content/res/TypedArray.html#getResourceId(int, int)
Similarly toyIcon.getResourceId(1, -1) will return the resource Id at index 1 of toyIcon or -1 if the attribute is not defined or not a resource.

Upvotes: 0

Dacotah
Dacotah

Reputation: 591

From the following link http://developer.android.com/reference/android/content/res/TypedArray.html#getResourceId(int, int)

"Value to return if the attribute is not defined or not a resource."

So basically it is a default value if what you are looking for isn't found.

Upvotes: 1

Nadir Belhaj
Nadir Belhaj

Reputation: 12073

getResourceId (int index, int defValue)

It's the defValue is stands for the Value to return if the attribute is not defined or not a resource.

more explanation :

public int getResourceId (int index, int defValue)

Added in API level 1 Retrieve the resource identifier for the attribute at index. Note that attribute resource as resolved when the overall TypedArray object is retrieved. As a result, this function will return the resource identifier of the final resource value that was found, not necessarily the original resource that was specified by the attribute.

Parameters index Index of attribute to retrieve. defValue Value to return if the attribute is not defined or not a resource. Returns Attribute resource identifier, or defValue if not defined.

Upvotes: 0

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