IndexOfcontains, etc. make the operation strange.

//hm.get("name"): "1_01.wav"
//sound_list: ["1_00.wav","1_01.wav"]
//Value is as above.

Log.d("asdf", String.valueOf(sound_list.contains(hm.get("name"))));  //-1
Log.d("asdf", String.valueOf(sound_list.contains("1_01.wav")));   //2

Log.d("asdf", String.valueOf(sound_list.contains(hm.get("name"))));  //false
Log.d("asdf", String.valueOf(sound_list.contains("1_01.wav")));   //true

You are trying to get the location of a specific value in the ArrayList. Specific values were extracted as get from HashMap.

However, like the first case of the code above, it returns false if you put it in the contents, and -1 if you put it in indexOf.

However, like the second case of the code above, hm to the input value of contains or indexOf.If you insert a value such as get("name") directly, it will function normally.

What on earth is this??