Cannot Populate listView with ArrayList<HashMap<String,?>>>

Question

ArrayList<HashMap<String, ?>>  list;
f(!list.isEmpty()){

          adapter = new MySimpleArrayAdapter(getActivity(),R.layout.inner_base_header_cutom, list);
          listview.setAdapter(adapter);
          Log.i("LIST Active", "LIST Active" + list.size());
      }

public class MySimpleArrayAdapter extends ArrayAdapter<ArrayList<HashMap<String, ?>>> {
          private final Context context;
          private final ArrayList<HashMap<String, ?>> values;

          public MySimpleArrayAdapter(Context context, int innerBaseHeaderCutom, ArrayList<HashMap<String, ?>> list) {
            super(context, innerBaseHeaderCutom, list);
            this.context = context;
            this.values = list;
          }

}

ERROR:

The constructor ArrayAdapter<ArrayList<HashMap<String,?>>>(Context, int, ArrayList<HashMap<String,?>>) is undefined

Also Cannot Remove ListView:

remove(list.get(position));

Error:

The method remove(ArrayList<HashMap<String,?>>) in the type ArrayAdapter<ArrayList<HashMap<String,?>>> is not applicable for the arguments (HashMap<String,capture#2-of ?>)

ArrayList<HashMap<String, ?>> list why the ?. They value is not a string?. Also where do you populate the list — Raghunandan
– Raghunandan, Commented Mar 7, 2014 at 7:20

Merlevede · Accepted Answer · 2014-03-07 07:40:41Z

1

Just strip the last argument when you call the constructor of the super class

super(context, innerBaseHeaderCutom);

EDIT:
Another think you can try is changing this:

public class MySimpleArrayAdapter extends ArrayAdapter<ArrayList<HashMap<String, ?>>> {

for

public class MySimpleArrayAdapter extends ArrayAdapter<HashMap<String, ?>> {

And do the same change in the constructor.

edited Mar 7, 2014 at 7:40

answered Mar 7, 2014 at 7:24

Merlevede

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2 Comments

rahstame Over a year ago

how will the adapter know many list should be populated sir. still not populating I check the list.size and I got three.

Merlevede Over a year ago

Because the ArrayAdpater expects you to pass the type of objects that you will have in your Array, not the structure holding those objects (which is the ArrayList).

Vishesh Chandra · Accepted Answer · 2014-03-07 07:44:57Z

You are creating ArrayList with ArrayList<HashMap<String, ?>> instead you can try ArrayList<HashMap<String, ? extends Object>>

Check the sample code and output.

public class MyJavaTesting{
public MyJavaTesting(ArrayList<HashMap<String, ? extends Object>> list) {
    System.out.println(list);
}

public static void main(String[] args) {
    ArrayList<HashMap<String, ? extends Object>> list = new ArrayList<HashMap<String,?>>();
    HashMap<String, String> map1 = new HashMap<String, String>();
    map1.put("Key", "value");
    list.add(map1);

    HashMap<String, Object> map2 = new HashMap<String, Object>();
    map2.put("Key", new Object());
    list.add(map2);

    MyJavaTesting manager = new MyJavaTesting(list);
}
}

Output: [{Key=value}, {Key=java.lang.Object@4f1d0d}]

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