Java 简单适配器,筛选时索引无效
我用数据库中的数据填充listview,它包括图像和文本。因此,我实际上无法过滤数据,然后将其传递给listview。我必须过滤listview,它是自己的。我使用一个简单的适配器和图像加载填充了listview。问题是在筛选列表视图时崩溃。请参阅logcat 我正在使用的代码: 用于处理图像的自定义简单适配器Java 简单适配器,筛选时索引无效,java,android,listview,android-listview,hashmap,Java,Android,Listview,Android Listview,Hashmap,我用数据库中的数据填充listview,它包括图像和文本。因此,我实际上无法过滤数据,然后将其传递给listview。我必须过滤listview,它是自己的。我使用一个简单的适配器和图像加载填充了listview。问题是在筛选列表视图时崩溃。请参阅logcat 我正在使用的代码: 用于处理图像的自定义简单适配器 public class ExtendedSimpleAdapter extends SimpleAdapter{ List<HashMap<String, Stri
public class ExtendedSimpleAdapter extends SimpleAdapter{
List<HashMap<String, String>> map;
String[] from;
int layout;
int[] to;
Context context;
LayoutInflater mInflater;
public ExtendedSimpleAdapter(Context context, ArrayList<HashMap<String, String>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
layout = resource;
map = data;
this.from = from;
this.to = to;
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
return this.createViewFromResource(position, convertView, parent, layout);
}
private View createViewFromResource(int position, View convertView,
ViewGroup parent, int resource) {
View v;
if (convertView == null) {
v = mInflater.inflate(resource, parent, false);
} else {
v = convertView;
}
this.bindView(position, v);
return v;
}
private void bindView(int position, View view) {
final Map dataSet = map.get(position);
if (dataSet == null) {
return;
}
final ViewBinder binder = super.getViewBinder();
final int count = to.length;
for (int i = 0; i < count; i++) {
final View v = view.findViewById(to[i]);
if (v != null) {
final Object data = dataSet.get(from[i]);
String text = data == null ? "" : data.toString();
if (text == null) {
text = "";
}
boolean bound = false;
if (binder != null) {
bound = binder.setViewValue(v, data, text);
}
if (!bound) {
if (v instanceof Checkable) {
if (data instanceof Boolean) {
((Checkable) v).setChecked((Boolean) data);
} else if (v instanceof TextView) {
// Note: keep the instanceof TextView check at the bottom of these
// ifs since a lot of views are TextViews (e.g. CheckBoxes).
setViewText((TextView) v, text);
} else {
throw new IllegalStateException(v.getClass().getName() +
" should be bound to a Boolean, not a " +
(data == null ? "<unknown type>" : data.getClass()));
}
} else if (v instanceof TextView) {
// Note: keep the instanceof TextView check at the bottom of these
// ifs since a lot of views are TextViews (e.g. CheckBoxes).
setViewText((TextView) v, text);
} else if (v instanceof ImageView) {
if (data instanceof Integer) {
setViewImage((ImageView) v, (Integer) data);
} else if (data instanceof String) {
setViewImage((ImageView) v, (String) data);
} else {
setViewImage((ImageView) v, text);
}
} else {
throw new IllegalStateException(v.getClass().getName() + " is not a " +
" view that can be bounds by this SimpleAdapter");
}
}
}
}
}
@Override
public int getCount() {
return super.getCount();
}
public void setViewImage(ImageView v, String bmp) {
v.setImageBitmap(ImageTools.decodeBase64(bmp));
}
}
日志:
java.lang.IndexOutOfBoundsException: Invalid index 2, size is 2
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at my.app.adapters.ExtendedSimpleAdapter.bindView(ExtendedSimpleAdapter.java:61)
at my.app.adapters.ExtendedSimpleAdapter.createViewFromResource(ExtendedSimpleAdapter.java:54)
at my.app.adapters.ExtendedSimpleAdapter.getView(ExtendedSimpleAdapter.java:41)
我通过实现自定义过滤器修复了它:
private class CustomFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (mUnfilteredData == null) {
mUnfilteredData = new ArrayList<HashMap<String, String>>(map);
}
if (prefix == null || prefix.length() == 0) {
List<HashMap<String, String>> list = mUnfilteredData;
results.values = list;
results.count = list.size();
} else {
String prefixString = prefix.toString().toLowerCase();
List<HashMap<String, String>> unfilteredValues = mUnfilteredData;
int count = unfilteredValues.size();
ArrayList<Map<String, ?>> newValues = new ArrayList<Map<String, ?>>(count);
for (int i = 0; i < count; i++) {
Map<String, ?> h = unfilteredValues.get(i);
if (h != null) {
int len = to.length;
for (int j=0; j<len; j++) {
String str = (String)h.get(from[j]);
String[] words = str.split(" ");
int wordCount = words.length;
for (int k = 0; k < wordCount; k++) {
String word = words[k];
if (word.toLowerCase().contains(prefixString)) {
newValues.add(h);
break;
}
}
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@SuppressWarnings("unchecked")
protected void publishResults(CharSequence constraint, FilterResults results) {
//Remove duplicates
map.addAll((java.util.Collection<? extends HashMap<String, String>>) results.values);
HashSet hs = new HashSet();
hs.addAll(map);
map.clear();
map.addAll(hs);
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
private class CustomFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (mUnfilteredData == null) {
mUnfilteredData = new ArrayList<HashMap<String, String>>(map);
}
if (prefix == null || prefix.length() == 0) {
List<HashMap<String, String>> list = mUnfilteredData;
results.values = list;
results.count = list.size();
} else {
String prefixString = prefix.toString().toLowerCase();
List<HashMap<String, String>> unfilteredValues = mUnfilteredData;
int count = unfilteredValues.size();
ArrayList<Map<String, ?>> newValues = new ArrayList<Map<String, ?>>(count);
for (int i = 0; i < count; i++) {
Map<String, ?> h = unfilteredValues.get(i);
if (h != null) {
int len = to.length;
for (int j=0; j<len; j++) {
String str = (String)h.get(from[j]);
String[] words = str.split(" ");
int wordCount = words.length;
for (int k = 0; k < wordCount; k++) {
String word = words[k];
if (word.toLowerCase().contains(prefixString)) {
newValues.add(h);
break;
}
}
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@SuppressWarnings("unchecked")
protected void publishResults(CharSequence constraint, FilterResults results) {
//Remove duplicates
map.addAll((java.util.Collection<? extends HashMap<String, String>>) results.values);
HashSet hs = new HashSet();
hs.addAll(map);
map.clear();
map.addAll(hs);
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
@Override
public Filter getFilter() {
if(filter != null) return filter;
else return filter = new CustomFilter();
}