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Editorial Team
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Asked: 2026-05-31T02:33:53+00:00

here are my items public ArrayList<HashMap<String,String>> c_tmp= new ArrayList<HashMap<String,String>>(); public HashMap<String,String>mapa=new HashMap<String, String>(); String[]

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here are my items

public ArrayList<HashMap<String,String>> c_tmp= new ArrayList<HashMap<String,String>>();
 public HashMap<String,String>mapa=new HashMap<String, String>();
String[] name_Val = null;

Can anyone help me how to store in a String[] the following line name_Val

name_Val = (String[]) c_tmp.toArray(new String[c_tmp.size()]);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,name_Val);

I get this exception
java.lang.ArrayStoreException: source[0] of type Ljava/util/HashMap; cannot be stored in destination array of type [Ljava/lang/String;

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1 Answer

  1. Editorial Team

    You are trying to flatten a map, which is a set of key/value pairs into a flat list of values. What’s supposed to happen to the keys here? Your c_tmp variable is a list of HashMaps, which is probably not what you want.

    If you only want the values from the map and you want to discard the keys, do this:

    List<String> strings = yourHashMap.values()

    You can then convert the List into an array should you so desire.

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