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POown adapter for expandablelistview crash cannot cast hasmap to list
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  1. POown adapter for expandablelistview crash cannot cast hasmap to list
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    copied!<p>I have my onw adapter for a <code>expandiblelistview</code>, it show the parents fine but when i click in a group to see the childs it crash:</p> <p><code>java.lang.ClassCastException: java.util.HashMap cannot be cast to java.util.List</code></p> <p>This is my own adapter:</p> <pre><code> public class adaptadorLista extends SimpleExpandableListAdapter { private Context mContext; private List&lt;? extends List&lt;? extends Map&lt;String, ?&gt;&gt;&gt; mChildData; private List&lt;? extends Map&lt;String, ?&gt;&gt; mParentData; private String[] mChildFrom; private int[] mChildTo; public adaptadorLista(Context contexto, List&lt;? extends Map&lt;String, ?&gt;&gt; creaListaDeGrupos, int lineaPadre, String[] strings, int[] is, List&lt;? extends List&lt;? extends Map&lt;String, ?&gt;&gt;&gt; creaListadeHijos, int lineaHija, String[] strings2, int[] is2) { super(contexto, creaListaDeGrupos, lineaPadre, strings, is, creaListadeHijos, lineaHija, strings2, is2); mContext = contexto; mChildData = creaListadeHijos; mChildFrom = strings2; mChildTo = is2; } @Override public long getChildId(int groupPosition, int childPosition) { return 0; } public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) { View v; if (convertView == null) { v = newChildView(isLastChild, parent); } else { v = convertView; } bindView(v, mChildData.get(groupPosition).get(childPosition), mChildFrom, mChildTo, groupPosition, childPosition); return v; } // This method binds my data to the Views specified in the child xml private void bindView(View view, Map&lt;String, ?&gt; data,String[] from, int[] to, int groupPosition, int childPosition) { int len = to.length - 1; // Apply TextViews for (int i = 0; i &lt; len; i++) { TextView v = (TextView) view.findViewById(to[i]); if (v != null) { v.setText((String) data.get(from[i])); } } } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } } </code></pre> <p>And the constructor with 2 methods for populate the data:</p> <pre><code>adaptadorLista expListAdapter = new adaptadorLista( contexto, creaListaDeGrupos(), R.layout.linea_padre, new String[] { "numero_servicio","profesion","direccion","fecha_cad" }, new int[] { R.id.tvServicio,R.id.tvProfesion,R.id.tvDireccion,R.id.tvfecha}, creaListadeHijos(), R.layout.linea_hija, new String[] { "tipo", "diasEnCurso","estado","fechaProCita" }, new int[] {R.id.tvTipo , R.id.tvDiasEnCurso, R.id.tvEstado,R.id.tvFechaProximaCita} ); setListAdapter( expListAdapter); registerForContextMenu(getExpandableListView()); } private List&lt;? extends List&lt;? extends Map&lt;String, ?&gt;&gt;&gt; creaListadeHijos() { ArrayList resultado_hijo = new ArrayList(); for(int i=0;i&lt;ArrayServicios.size();i++){ HashMap hijo = new HashMap(); hijo.put("tipo", tipos.get(i)); hijo.put("diasEnCurso", diasEnCurso.get(i)); hijo.put("estado", estados.get(i)); hijo.put("fechaProCita", fechasProximasCitas.get(i)); resultado_hijo.add(hijo); } return (List)resultado_hijo; } @SuppressWarnings({ "unchecked", "rawtypes" }) private List&lt;? extends Map&lt;String, ?&gt;&gt; creaListaDeGrupos() { ArrayList resultado_padre = new ArrayList(); for(int i=0;i&lt;ArrayServicios.size();i++){ HashMap padre = new HashMap(); padre.put("numero_servicio", numerosServicios.get(i)); padre.put("profesion", profesiones.get(i)); padre.put("direccion", direcciones.get(i)); padre.put("fecha_cad", fechasCaduca.get(i)); resultado_padre.add(padre); } return (List)resultado_padre; } </code></pre> <p>I found a example using this adaptador and works but not for me..</p> <p><strong>Solution :</strong></p> <pre><code>/********Metodo que rellena la lista de hijos*********************/ private List&lt;? extends List&lt;? extends Map&lt;String, ?&gt;&gt;&gt; creaListadeHijos() { List&lt;List&lt;Map&lt;String, String&gt;&gt;&gt; resultado_hijo = new ArrayList&lt;List&lt;Map&lt;String, String&gt;&gt;&gt;(); for(int i=0;i&lt;ArrayServicios.size();i++){ List&lt;Map&lt;String, String&gt;&gt; hijo = new ArrayList&lt;Map&lt;String,String&gt;&gt;(); Map&lt;String, String&gt; curChildMap = new HashMap&lt;String, String&gt;(); curChildMap.put("tipo", tipos.get(i)); curChildMap.put("diasEnCurso", diasEnCurso.get(i)); curChildMap.put("estado", estados.get(i)); curChildMap.put("fechaProCita", fechasProximasCitas.get(i)); hijo.add(curChildMap); resultado_hijo.add(hijo); } return resultado_hijo; } /*********************************************************************/ </code></pre>
 

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