[英]Searching listview with custom ArrayAdapter
I have a listview that has a custom adapter, and I was trying to make it searchable using an Action Item.我有一个带有自定义适配器的列表视图,我试图使用操作项使其可搜索。 When I click the search icon in the action bar, the edit text comes up, but when I enter text and click "done" on the keyboard, nothing happens.当我单击操作栏中的搜索图标时,会出现编辑文本,但是当我输入文本并单击键盘上的“完成”时,没有任何反应。
Here is the main class:这是主类:
public class ItemId extends SherlockListActivity {
EditText editsearch;
ArrayAdapter<String> adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Context ctx = getApplication();
Resources res = ctx.getResources();
String[] options = res.getStringArray(R.array.item_ids);
String[] ids = res.getStringArray(R.array.item_names);
TypedArray icons = res.obtainTypedArray(R.array.item_images);
adapter = new ItemIDAdapter(ctx, R.layout.idslistitem, ids, options, icons);
setListAdapter(adapter );
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Get the options menu view from menu.xml in menu folder
getSupportMenuInflater().inflate(R.menu.items_menu, menu);
// Locate the EditText in menu.xml
editsearch = (EditText) menu.findItem(R.id.menu_search).getActionView();
// Capture Text in EditText
editsearch.addTextChangedListener(textWatcher);
// Show the search menu item in menu.xml
MenuItem menuSearch = menu.findItem(R.id.menu_search);
menuSearch.setOnActionExpandListener(new OnActionExpandListener() {
// Menu Action Collapse
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Empty EditText to remove text filtering
editsearch.setText("");
editsearch.clearFocus();
return true;
}
// Menu Action Expand
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Focus on EditText
editsearch.requestFocus();
// Force the keyboard to show on EditText focus
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
return true;
}
});
// Show the settings menu item in menu.xml
MenuItem menuSettings = menu.findItem(R.id.home);
// Capture menu item clicks
menuSettings.setOnMenuItemClickListener(new OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
Intent intent2 = new Intent(ItemId.this, Home.class);
startActivity(intent2);
return true;
}
});
return true;
}
// EditText TextWatcher
private TextWatcher textWatcher = new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
String text = editsearch.getText().toString()
.toLowerCase(Locale.getDefault());
adapter.getFilter().filter(text);
};
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
};
}
And here is the Adapter class:这是 Adapter 类:
public class ItemIDAdapter extends ArrayAdapter<String> implements Filterable {
public LayoutInflater mInflater;
public String[] mStrings;
public String[] mIds;
public TypedArray mIcons;
public int mViewResourceId;
public ItemIDAdapter(Context ctx, int viewResourceId,
String[] strings, String[] ids, TypedArray icons) {
super(ctx, viewResourceId, strings);
mInflater = (LayoutInflater)ctx.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
mStrings = strings;
mIds = ids;
mIcons = icons;
mViewResourceId = viewResourceId;
}
@Override
public int getCount() {
return mStrings.length;
}
@Override
public String getItem(int position) {
return mStrings[position];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = mInflater.inflate(mViewResourceId, null);
ImageView iv = (ImageView)convertView.findViewById(R.id.option_icon);
iv.setImageDrawable(mIcons.getDrawable(position));
TextView tv = (TextView)convertView.findViewById(R.id.option_text);
tv.setText(mStrings[position]);
TextView tv1 = (TextView)convertView.findViewById(R.id.itemids);
tv1.setText(mIds[position]);
return convertView;
}
}
If anyone has any idea as to why nothing happens when I search, or knows how to fix it, it'd be greatly appreciated.如果有人知道为什么我搜索时什么也没发生,或者知道如何解决它,我们将不胜感激。 Thanks!!谢谢!!
You need to implement a custom filter.您需要实现自定义过滤器。 Have a look at this post here someone else has had a similar problem which he solved: https://stackoverflow.com/a/8258457/2045570看看这篇文章,其他人也有类似的问题,他解决了: https : //stackoverflow.com/a/8258457/2045570
Below is mine code, which is working perfectly:-以下是我的代码,它运行良好:-
public class ExpenditureAdapter extends ArrayAdapter<Expenditure> implements Filterable {
ArrayList<Expenditure> listArray;
ArrayList<Expenditure> filteredlistArray;
private Filter mFilter;
public ExpenditureAdapter(@NonNull Context context, ArrayList<Expenditure> list) {
super(context,0, list);
listArray=list;
filteredlistArray=list;
}
@Override
public int getCount() {
return filteredlistArray.size(); // total number of elements in the list
}
public void add(Expenditure object) {
listArray.add(object);
this.notifyDataSetChanged();
}
public Filter getFilter() {
if (mFilter == null) {
mFilter = new CustomFilter();
}
return mFilter;
}
@Override
public Expenditure getItem(int i) {
return filteredlistArray.get(i); // single item in the list
}
@Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
@Override
public long getItemId(int i) {
return i; // index number
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
Expenditure expenditure = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.listexpenditure, parent, false);
}
// Lookup view for data population
TextView ExpId = (TextView) convertView.findViewById(R.id.ExpId);
TextView ExDate = (TextView) convertView.findViewById(R.id.ExDate);
TextView ExpAmt = (TextView) convertView.findViewById(R.id.ExpAmt);
TextView ExpDetail = (TextView) convertView.findViewById(R.id.ExpDetail);
// Populate the data into the template view using the data object
ExpId.setText(expenditure.ExpId);
SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
String dateTime = dateFormat.format(expenditure.ExpDate);
ExDate.setText(dateTime);
ExpAmt.setText(String.valueOf(expenditure.ExpAmt));
ExpDetail.setText(expenditure.ExpDetail);
return convertView;
}
private class CustomFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if(constraint == null || constraint.length() == 0) {
ArrayList<Expenditure> list = new ArrayList<Expenditure>(listArray);
results.values = list;
results.count = list.size();
} else {
ArrayList<Expenditure> newValues = new ArrayList<Expenditure>();
for(int i = 0; i < listArray.size(); i++) {
Expenditure e_item = listArray.get(i);
if(e_item.ExpDetail.contains(constraint)) {
newValues.add(e_item);
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
filteredlistArray = (ArrayList<Expenditure>) results.values;
notifyDataSetChanged();
}
}
and use it in your code as below:-并在您的代码中使用它,如下所示:-
private TextWatcher textWatcher = new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
String text = txtSearch.getText().toString()
.toLowerCase(Locale.getDefault());
adapter.getFilter().filter(text);
};
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
};
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