Question

我有一个带有我自己的适配器的expandiblelistview，在父行中我有3个图像隐形和3个textview。

在活动中，我有一个包含数据的String [] []。根据数据，我想将图像设置为可见。

我试着去做：

@Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parentView) {
        View v;
        if (convertView == null) {
            v = newGroupView(isExpanded, parentView);
        } else {
            v = convertView;
        }
        ponIconos();
        return v;
    }

    private void ponIconos() {

        ImageView drCandado = (ImageView) findViewById(R.id.icono_candado);
        ImageView drOjos = (ImageView) findViewById(R.id.icono_ojo);
        ImageView drUrgente = (ImageView) findViewById(R.id.icono_urgente);

        for(int i =0; i<ArrayServicios.size();i++){
            if (sIconos[i][0] != "null")
                drUrgente.setVisibility(View.VISIBLE);
            if (sIconos[i][1] != "null")
                drCandado.setVisibility(View.VISIBLE);
            if (sIconos[i][2] != "null")
                drOjos.setVisibility(View.VISIBLE);     
        }
    }

但它崩溃了nullpo .. logcat的：

06-06 08:44:01.066: E/AndroidRuntime(879): FATAL EXCEPTION: main
06-06 08:44:01.066: E/AndroidRuntime(879): java.lang.NullPointerException
06-06 08:44:01.066: E/AndroidRuntime(879):  at com.reparalia.movilidad.ListadoServicios$adaptadorLista.ponIconos(ListadoServicios.java:532)
06-06 08:44:01.066: E/AndroidRuntime(879):  at com.reparalia.movilidad.ListadoServicios$adaptadorLista.getGroupView(ListadoServicios.java:520)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.ExpandableListConnector.getView(ExpandableListConnector.java:445)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.AbsListView.obtainView(AbsListView.java:2033)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.ListView.makeAndAddView(ListView.java:1772)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.ListView.fillDown(ListView.java:672)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.ListView.fillFromTop(ListView.java:732)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.ListView.layoutChildren(ListView.java:1625)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.AbsListView.onLayout(AbsListView.java:1863)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1617)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1401)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.ScrollView.onLayout(ScrollView.java:1405)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.RelativeLayout.onLayout(RelativeLayout.java:925)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1399)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.View.layout(View.java:11278)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewGroup.layout(ViewGroup.java:4224)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1489)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.os.Looper.loop(Looper.java:137)
06-06 08:44:01.066: E/AndroidRuntime(879):  at android.app.ActivityThread.main(ActivityThread.java:4424)
06-06 08:44:01.066: E/AndroidRuntime(879):  at java.lang.reflect.Method.invokeNative(Native Method)
06-06 08:44:01.066: E/AndroidRuntime(879):  at java.lang.reflect.Method.invoke(Method.java:511)
06-06 08:44:01.066: E/AndroidRuntime(879):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-06 08:44:01.066: E/AndroidRuntime(879):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-06 08:44:01.066: E/AndroidRuntime(879):  at dalvik.system.NativeStart.main(Native Method)

还有其他方式吗？

解决方案

/************************************************************************/
        /********************* Metodo que GENERA LA VISTA DE LOS PADRES ****************/
        @Override
        public View getGroupView(final int groupPosition,
                final boolean isExpanded, final View convertView,
                final ViewGroup parent) {
            View v;
            if (convertView == null) {
                v = newGroupView(isExpanded, parent);
            } else **{
                v = convertView;
            }
            llenaPadre(v, padreDesde.get(groupPosition), padreDesde,
                    padreHasta, groupPosition);
            return v;
        }
        /********************* Metodo que rellena las filas padres ****************/
        private void llenaPadre(View v, Map<String, ?> map,
                List<? extends Map<String, ?>> datosPadres, int[] padreHasta2,
                int groupPosition) {
            ImageView drCandado = (ImageView) v
                    .findViewById(R.id.icono_candado);
            ImageView drOjos = (ImageView) v.findViewById(R.id.icono_ojo);
            ImageView drUrgente = (ImageView) v
                    .findViewById(R.id.icono_urgente);
            int len = padreHasta2.length - 1;
            for (int i = 0; i < len; i++) {
                TextView tv = (TextView) v.findViewById(padreHasta2[i]);
                if (v != null) {
                    String texto = (String) map.get(cabecerasPadres[i]);
                    tv.setText(texto);
                    if (sIconos[0][groupPosition] != null)
                        if (drUrgente != null)
                            drUrgente.setVisibility(View.VISIBLE);
                    if (sIconos[1][groupPosition] != null)
                        if (drCandado != null)
                            drCandado.setVisibility(View.VISIBLE);
                    if (sIconos[2][groupPosition] != null)
                        if (drOjos != null)
                            drOjos.setVisibility(View.VISIBLE);
                }
            }**
        }

Answer 1

我认为问题是，你在这里缺少视图参考。按Id执行查找视图时，在适配器中，您必须根据已膨胀的视图引用该项目。在你的情况下“convertView”。尝试这样，通过ponIcons（）传递convertView objetc并在那里引用你的小部件。

@Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parentView) {
        View v;
        if (convertView == null) {
            v = newGroupView(isExpanded, parentView);
        } else {
            v = convertView;
        }
        ponIconos(convertView);
        return v;
    }

    private void ponIconos(View convertView) {

        ImageView drCandado = (ImageView)convertView.findViewById(R.id.icono_candado);
        ImageView drOjos = (ImageView)convertView. findViewById(R.id.icono_ojo);
        ImageView drUrgente = (ImageView)convertView. findViewById(R.id.icono_urgente);

        for(int i =0; i<ArrayServicios.size();i++){
            if (sIconos[i][0] != "null")
                if(drUrgente!=null)
                drUrgente.setVisibility(View.VISIBLE);
            if (sIconos[i][1] != "null")
                if(drCandado!=null)
                drCandado.setVisibility(View.VISIBLE);
            if (sIconos[i][2] != "null")
                if(drOjos!=null)
                drOjos.setVisibility(View.VISIBLE);     
        }
    }

在expandablelistview中为父项设置可见图像

1 个答案: