ListView在过滤后只记住旧列表的位置

Question

我创建了一个应用程序，显示包含可点击项目的列表视图。我有一个编辑文本来进行搜索。一切都很好，但是当我搜索一个项目时，应用程序给我一个新列表，问题是当我点击这个新列表项目上的任何项目时，它将我重定向到旧列表中项目的链接。这是我的代码： - 对于ReaderListAdapter.java：

  import java.util.List;
  import android.content.Context;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.animation.Animation;
  import android.view.animation.AnimationUtils;
  import android.widget.BaseAdapter;
  import android.widget.ImageView;
  import android.widget.TextView;

 public class ReaderListAdapter extends BaseAdapter {
 private List<Reader> listReader = null;
 LayoutInflater layoutInflater;
 Context context;
 private int lastPosition = -1;

// constructeur
public ReaderListAdapter(Context context, List<Reader> listFood) {
this.listReader = listFood;
layoutInflater = LayoutInflater.from(context);
this.listReader = listFood;
this.context = context;
}


@Override
public int getCount() {
// TODO Auto-generated method stub
return listReader.size();
}

 @Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return listReader.get(position);
}

@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}

static class ViewHolder {
TextView nomView;
TextView priceView;
ImageView pictureView;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;

if (convertView == null) {
    convertView = layoutInflater.inflate(R.layout.reader_row, null);
    holder = new ViewHolder();
    // initialisation des vues
    holder.nomView = (TextView) convertView.findViewById(R.id.name);
    holder.priceView = (TextView) convertView.findViewById(R.id.price);
    holder.pictureView = (ImageView) convertView
            .findViewById(R.id.picture);

    convertView.setTag(holder);
} else {
    holder = (ViewHolder) convertView.getTag();
}
// affchier les données convenablement dans leurs positions
holder.nomView.setText(listReader.get(position).getName());
holder.priceView.setText(String.valueOf(listReader.get(position)
        .getPrice()));
       holder.pictureView.setBackgroundDrawable(listReader.get(position).getPicture());

// changer R.anim.ton_effet
Animation animation = AnimationUtils.loadAnimation(context,
        (position > lastPosition) ? R.anim.up_from_bottom
                : R.anim.up_from_bottom);

convertView.startAnimation(animation);
lastPosition = position;
return convertView;
}}

对于MainActivity.java

 import java.util.ArrayList;
 import android.app.Activity;
 import android.content.Intent;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.EditText;
 import android.widget.ListView;

  public class MainActivity extends Activity {
  String[] listNames = { "site1", "site2", "site3"};
  int[] listPrices = { 1, 2, 3};
  ArrayList<Reader> listReader;
  ListView lv;
  EditText search;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listReader);
search = (EditText) findViewById(R.id.search);
Drawable[] listPictures = {
        getResources().getDrawable(R.drawable.a1),
        getResources().getDrawable(R.drawable.a2),
        getResources().getDrawable(R.drawable.a3)};

listReader = new ArrayList<Reader>();

for (int i = 0; i < listPictures.length; i++) {
    listReader.add(new Reader(i + 1, listNames[i], listPictures[i],
            listPrices[i]));
}

lv.setAdapter(new ReaderListAdapter(getApplicationContext(), listReader));
search.addTextChangedListener(new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence arg0, int arg1, int arg2,
            int arg3) {
        // TODO Auto-generated method stub

    }

    @Override
    public void beforeTextChanged(CharSequence arg0, int arg1,
            int arg2, int arg3) {
        // TODO Auto-generated method stub

    }

    @Override
    public void afterTextChanged(Editable arg0) {
        // TODO Auto-generated method stub
        filtrer();
    } });

lv.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
    {
        Intent intent=new Intent(MainActivity.this,WebActivity.class);

        switch (position) {
        case 0:                
            intent.setData(Uri.parse("http://www.google.com")) ;break;

        case 1:
            intent.setData(Uri.parse("http://www.yahoo.com")) ;break;

        case 2:
            intent.setData(Uri.parse("http://www.quranf.com")) ;break;
      }
        if (intent != null) {
              startActivity(intent);
            }} });}

 public void filtrer() {
// retourner la chaine saisie par l'utilisateur
String name = search.getText().toString();

// créer une nouvelle liste qui va contenir la résultat à afficher
final ArrayList<Reader> listReaderNew = new ArrayList<Reader>();

for (Reader reader : listReader) {
    // si le nom du food commence par la chaine saisie , ajouter-le !
    if (reader.getName().toLowerCase().toString().contains(name)) {
        listReaderNew.add(reader);
    }
}
// vider la liste
lv.setAdapter(null);
if (listReaderNew.size() == 0) {
    listReaderNew.add(new Reader(100, "Pas d'élements.. réessayer !",
            getResources().getDrawable(R.drawable.error), 0));
}
// ajouter la nouvelle liste
lv.setAdapter(new ReaderListAdapter(getApplicationContext(),    listReaderNew));
}}

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Answer 1

 public class ReaderListAdapter extends BaseAdapter {
 private List<Reader> listReader = null;
 LayoutInflater layoutInflater;
 Context context;
private int lastPosition = -1;
  ArrayList<Reader> arrayList;

// constructeur
public ReaderListAdapter(Context context, List<Reader> listFood) {
this.listReader = listFood;
layoutInflater = LayoutInflater.from(context);
this.listReader = listFood;
this.context = context;
this.arrayList=listFood;
}


@Override
public int getCount() {
// TODO Auto-generated method stub
return listReader.size();
}

  @Override
  public Object getItem(int position) {
 // TODO Auto-generated method stub
 return listReader.get(position);
 }

 @Override
 public long getItemId(int arg0) {
   // TODO Auto-generated method stub
  return arg0;
  }

 static class ViewHolder {
 TextView nomView;
 TextView priceView;
 ImageView pictureView;
 }

  @Override
 public View getView(int position, View convertView, ViewGroup parent) {
 ViewHolder holder;

if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.reader_row, null);
holder = new ViewHolder();
// initialisation des vues
holder.nomView = (TextView) convertView.findViewById(R.id.name);
holder.priceView = (TextView) convertView.findViewById(R.id.price);
holder.pictureView = (ImageView) convertView
        .findViewById(R.id.picture);

convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// affchier les données convenablement dans leurs positions
 holder.nomView.setText(listReader.get(position).getName());
 holder.priceView.setText(String.valueOf(listReader.get(position)
    .getPrice()));
           holder.pictureView.setBackgroundDrawable(listReader.get(position).getPicture());

// changer R.anim.ton_effet
Animation animation = AnimationUtils.loadAnimation(context,
    (position > lastPosition) ? R.anim.up_from_bottom
            : R.anim.up_from_bottom);

convertView.startAnimation(animation);
lastPosition = position;
return convertView;
}
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
listFood.clear();
if (charText.length() == 0) {
    listFood.addAll(arraylist);
} else {
    for (Reader cp : arraylist) {
        if (cp.getName().toLowerCase(Locale.getDefault())
                .contains(charText)) {
            listFood.add(cp);
        }
    }
}
notifyDataSetChanged();
}
}

*******************您的主要活动**********************

  public class MainActivity extends Activity {
  String[] listNames = { "site1", "site2", "site3"};
  int[] listPrices = { 1, 2, 3};
  ArrayList<Reader> listReader;
  ListView lv;
  EditText search;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);

 setContentView(R.layout.activity_main);
 lv = (ListView) findViewById(R.id.listReader);
 search = (EditText) findViewById(R.id.search);
  Drawable[] listPictures = {
    getResources().getDrawable(R.drawable.a1),
    getResources().getDrawable(R.drawable.a2),
    getResources().getDrawable(R.drawable.a3)};

  listReader = new ArrayList<Reader>();

 for (int i = 0; i < listPictures.length; i++) {
listReader.add(new Reader(i + 1, listNames[i], listPictures[i],
        listPrices[i]));
 }
 ReaderListAdapter readerListAdapternew ReaderListAdapter(getApplicationContext(), listReader)
 lv.setAdapter(readerListAdapternew);
 search.addTextChangedListener(new TextWatcher() {

 search.addTextChangedListener(new TextWatcher() {

 @Override
 public void onTextChanged(CharSequence arg0, int arg1, int arg2,
    int arg3) {
   // TODO Auto-generated method stub

  }

  @Override
 public void beforeTextChanged(CharSequence arg0, int arg1,
    int arg2, int arg3) {
  // TODO Auto-generated method stub

 }

 @Override
 public void afterTextChanged(Editable arg0) {
  String text = search.getText().toString()
                .toLowerCase(Locale.getDefault());
        readerListAdapternew .filter(text);
 } });


lv.setOnItemClickListener(new OnItemClickListener() {

 @Override
 public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
 {
    Intent intent=new Intent(MainActivity.this,WebActivity.class);

    switch (position) {
    case 0:                
        intent.setData(Uri.parse("http://www.google.com")) ;break;

    case 1:
        intent.setData(Uri.parse("http://www.yahoo.com")) ;break;

    case 2:
        intent.setData(Uri.parse("http://www.quranf.com")) ;break;
  }
    if (intent != null) {
          startActivity(intent);
        }} });}
  }