问题
I am suffering a weird problem. Actually I have a customize listview in which I am using a filter, everything working fine but when I am typing a text to edittext it disappear the all listitem. I am strange why this going on with me, still I am not a champ of android so need some help. I have seen many similar problems on stackoverflow like this,this,this, and many more, but nothing works in my case. I dont know where i am doing mistake.
My listitem click working fine, So hope it will also work after item search into edittext.
Here is my MainActivity.java :
package com.sunil.listviewmuntilerowdelete;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
public class MainActivity extends Activity {
private String[] myfriendname = null;
EditText edtSearch;
private int[] photo = null;
ListView listView = null;
Context contex = null;
MyListAdapter adapter = null;
private List<MyFriendsSDetails> list = new ArrayList<MyFriendsSDetails>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contex = this;
listView = (ListView) findViewById(R.id.listview);
edtSearch = (EditText) findViewById(R.id.EditText01);
myfriendname = new String[] { "Sunil Gupta", "Abhishek Tripathi",
"Sandeep Pal", "Amit Verma" };
photo = new int[] { R.drawable.sunil, R.drawable.abhi,
R.drawable.sandy, R.drawable.amit };
final String text[] = { "Sunil is a great man",
"Abhishek is hardworking", "Sandeep is same as amit",
"Amit is unique" };
final Integer[] image = { R.drawable.sunil, R.drawable.abhi,
R.drawable.sandy, R.drawable.amit,
};
for (int index = 0; index < myfriendname.length; index++) {
MyFriendsSDetails details = new MyFriendsSDetails(
myfriendname[index], photo[index]);
list.add(details);
}
adapter = new MyListAdapter(contex, list);
listView.setAdapter(adapter);
listView.setTextFilterEnabled(true);
edtSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2,
int arg3) {
// When user changed the Text
MainActivity.this.adapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
}
});
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(MainActivity.this,
SecondActivity.class);
intent.putExtra("key1", image[position]);
intent.putExtra("key2", text[position]);
startActivity(intent);
}
});
}
}
MyListAdapter.java
package com.sunil.listviewmuntilerowdelete;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyListAdapter extends ArrayAdapter<MyFriendsSDetails> {
Context context;
LayoutInflater inflater;
List<MyFriendsSDetails> list;
public MyListAdapter(Context context, List<MyFriendsSDetails> list) {
super(context, 0, list);
this.context = context;
this.list = list;
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_item, null);
holder.name = (TextView) convertView.findViewById(R.id.title);
holder.photo = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText(list.get(position).getMyfriendname());
holder.photo.setImageResource(list.get(position).getPhoto());
return convertView;
}
private class ViewHolder {
TextView name;
ImageView photo;
}
}
Here is MyFriendsSDetails.java :
package com.sunil.listviewmuntilerowdelete;
public class MyFriendsSDetails {
private String myfriendname = null;
private int photo = 0;
public MyFriendsSDetails(String friendname, int myphoto) {
this.myfriendname = friendname;
this.photo = myphoto;
}
public String getMyfriendname() {
return myfriendname;
}
public void setMyfriendname(String myfriendname) {
this.myfriendname = myfriendname;
}
public int getPhoto() {
return photo;
}
public void setPhoto(int photo) {
this.photo = photo;
}
}
Thanks in advance.
回答1:
As you are using custom adapter, android cant recognize "MainActivity.this.adapter.getFilter().filter(cs);"
You have to override getFilter() method and do manual changes.
Checkout below code :
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint,FilterResults results) {
mDisplayedValues = (ArrayList<HashMap<String, String>>) results.values; // has the filtered values
notifyDataSetChanged(); // notifies the data with new filtered values
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults(); // Holds the results of a filtering operation in values
ArrayList<HashMap<String, String>> FilteredArrList = new ArrayList<HashMap<String, String>>();
if (mOriginalValues == null) {
mOriginalValues = new ArrayList<HashMap<String, String>>(mDisplayedValues); // saves the original data in mOriginalValues
}
/********
*
* If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values
* else does the Filtering and returns FilteredArrList(Filtered)
*
********/
if (constraint == null || constraint.length() == 0) {
// set the Original result to return
results.count = mOriginalValues.size();
results.values = mOriginalValues;
} else {
constraint = constraint.toString().toLowerCase();
for (int i = 0; i < mOriginalValues.size(); i++) {
String data = mOriginalValues.get(i).get("name");
if (data.toLowerCase().startsWith(constraint.toString())) {
HashMap<String, String> hmap=new HashMap<String, String>();
hmap.put("name", mOriginalValues.get(i).get("name"));
hmap.put("image", mOriginalValues.get(i).get("image"));
FilteredArrList.add(hmap);
Log.e("DEBUG", "name : "+data);
}
}
// set the Filtered result to return
results.count = FilteredArrList.size();
results.values = FilteredArrList;
}
return results;
}
};
return filter;
}
and use it in your adapter getView()
holder.name.setText(mDisplayedValues.get(position).get("name"));
来源：https://stackoverflow.com/questions/21038861/filter-on-listview-disappear-listitems-while-entering-something-into-edittext