Question

I have a class called PlayerList, in in that class i have an ArrayList defined like this :

private ArrayList<Bitmap> images = new ArrayList<Bitmap>();

Now, an ArrayList remove method can exept 2 arguments, an index and an Object.

I’m trying to remove a Bitmap from the array by sending the Bitmap to it. The thing is the bit map is made of the same image but the instace of the Bitmap i saved in the array is not the same i’m trying to find, when i print the ArrayList to console i see new names all the time, stuff like :

[android.graphics.Bitmap@44ea2d48, android.graphics.Bitmap@44ea2e20]

Could this be related? and while wer’re at it, The class implements Parcelable so the data being read/writen back and forth, that can’t be too healthy too, right?

Am i missing a generic problem or it’s code specific and i should publish my code?

My problem here basiclly is when i try to remove the Bitmap, it allways removes the wrong item in the arraylist, always 1 before the 1 i need

Answer 1

Unless you have a handle to the BitMap's hash code or a like key based on which it is stored, you can’t remove a desired one from the list. If you just want to depend on BitMap stored, you need to traverse through the list and parse elements to find desired bitmap. Again you need a hascode to identify if the BitMap you are parsing is what you are looking for. Meaning you need to maintain a list of hashcode's for each of the BitMap stored. Alternatively use HashMap over List that allows to store a key against a BitMap being stored. And you can process your requirement based on the key and use it whenever required to remove a BitMap from the HashMap table.

HashMap<String, BitMap> myBitMaps = ... // construct as you desire.
...
if ( condition satisfied on key ) {
  myBitMaps.remove( keyObject );
  // process further
}