未找到搜索项目后列表视图清空，即使我清除搜索项目后仍为空

Question

我有一个列表视图，其中显示最近的联系人，我有 Edittext，通过它我可以搜索最近的列表。当我搜索时一切都很完美，但是当找不到搜索到的项目并且列表变空并且即使在我清除我的搜索编辑文本后仍然为空时出现问题。

请告诉我哪里出错了。

这是我的代码。

RecentContactAdapter

public class RecentContactsAdapter extends BaseAdapter {
Context mContext;
ArrayList<Contacts> coverList;
public  ArrayList<Contacts> orig;
private ColorGenerator mColorGenerator = ColorGenerator.MATERIAL;
private TextDrawable.IBuilder mDrawableBuilder;
public RecentContactsAdapter(Context c, ArrayList<Contacts> coverList)
{
    super();
    mContext = c;
    this.coverList = coverList;
    this.orig = new ArrayList<Contacts>();
    this.orig.addAll(coverList);

}

@Override
public int getCount()
{
    return coverList.size();
}

@Override
public Contacts getItem(int position) {
    return coverList.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(final int position, View convertView, final ViewGroup parent)
{



    return grid;
}

public void filter(String charText)
{
    charText = charText.toLowerCase(Locale.getDefault());
    coverList.clear();
    if (charText.length() == 0)
    {
        coverList.addAll(orig);
    }

    else
    {
        for (Contacts wp : orig)
        {
            if (wp.getName().toLowerCase(Locale.getDefault())
                    .contains(charText) || wp.getName().toLowerCase(Locale.getDefault())
                    .contains(charText) || wp.getNumber().toLowerCase(Locale.getDefault())
                    .contains(charText))
            {

                if(coverList.contains(wp))
                {}
                else {
                    coverList.add(wp);
                }
            }
        }
    }
    notifyDataSetChanged();
}

}

RecentContactFragment

public class RecentContactsTab extends Fragment
{
View v;
Context c;
public static ListView rec_list;
ArrayList<Contacts> recent_list;
public static RecentContactsAdapter rec_ContactsAdapter;
ProgressDialog pd;
public static String number;
boolean appInstalled;
public static String email;
EditText search;
Functions functions;
VariableListener mCallback;
TextView noContact;
RecentContactsAdapter search_adapter;
RelativeLayout list;


@Override
public void onAttach(Context context) {
    try {
        mCallback = (VariableListener) context;
    } catch (ClassCastException e) {
        e.printStackTrace();
    }
    super.onAttach(context);
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
{ Log.e("STEP","1");
    v = inflater.inflate(R.layout.recent_layout, container, false);
    c = this.getActivity();

    rec_list = (ListView) v.findViewById(R.id.contact);
    recent_list = new ArrayList<Contacts>();
    search= (EditText) v.findViewById(R.id.recentsearch);

    v.findViewById(R.id.searchView1);
    noContact = (TextView) v.findViewById(R.id.rec_noContact);
    list= (RelativeLayout) v.findViewById(R.id.leftSide);
    tabLayout.getSelectedTabPosition();

    mCallback.onVariableListener(0);

    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
    {
        new GetCotact().execute();
    } else
        {
        functions = new Functions(c);
        if (Settings.canDrawOverlays(c) && functions.checkpermission()) {
            new GetCotact().execute();
        } else {
            if (!Settings.canDrawOverlays(c)) {
                Intent i = new Intent(this.getActivity(), AllPermissions.class);
                startActivity(i);
            } else if (!functions.checkpermission()) {
                Intent i = new Intent(this.getActivity(), AllPermissions.class);
                startActivity(i);
            }
        }
    }

   rec_list.setTextFilterEnabled(true);

    setupSearchView();
    return v;
}

private void setupSearchView() {

    search.addTextChangedListener(new TextWatcher()
    {

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

            if (recent_list.size() > 0)
            {
                rec_ContactsAdapter.filter(text);
            }

            else
            {
                    rec_ContactsAdapter = new RecentContactsAdapter(getActivity(), recent_list);
                    rec_list.setAdapter(rec_ContactsAdapter);

            }
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1,
                                      int arg2, int arg3)
        {
            search_adapter = new RecentContactsAdapter(getActivity(), recent_list);
            rec_list.setAdapter(rec_ContactsAdapter);
        }

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

class GetCotact extends AsyncTask<String, Void, String> {

    @Override
    protected void onPreExecute() {
        Log.e("STEP","2");
        super.onPreExecute();
    }

    @Override
    protected void onPostExecute(String s)
    {
        rec_ContactsAdapter = new RecentContactsAdapter(c, recent_list);
        search_adapter=rec_ContactsAdapter;
        rec_list.setAdapter(rec_ContactsAdapter);
        super.onPostExecute(s);
    }

    @Override
    protected String doInBackground(String... params) {
        readContacts();
        return null;

    }
}

private void readContacts() {
    ContentResolver cr = getActivity().getContentResolver();

    if (ActivityCompat.checkSelfPermission(this.getActivity(), Manifest.permission.READ_CALL_LOG) != PackageManager.PERMISSION_GRANTED) {

    }
    else
    {
        Cursor cur = cr.query(CallLog.Calls.CONTENT_URI, null, null, null, CallLog.Calls._ID + " DESC");
        String phone = null;
        String emailContact = null;
        String image_uri = null;
        Bitmap bitmap;
        String name;


        if (cur.getCount() > 0)
        {
            while (cur.moveToNext())
            {
                Log.e("STEP","3");
                name = cur.getString(cur
                        .getColumnIndex(CallLog.Calls.CACHED_NAME));
                phone=cur.getString(cur.getColumnIndex(CallLog.Calls.NUMBER));

                if (name==null)
                {
                    name=" ";
                    phone=cur.getString(cur.getColumnIndex(CallLog.Calls.NUMBER));

                    image_uri=null;
                }
                else
                {
                    name = cur.getString(cur
                            .getColumnIndex(CallLog.Calls.CACHED_NAME));
                }

                recent_list.add(new Contacts(name, phone, image_uri,emailContact));
                emailContact="";
                phone="";
            }
            cur.close();
        }
        else
        {
            noContact.setVisibility(View.VISIBLE);
            noContact.setTextColor(getResources().getColor(R.color.default_color));
            noContact.setText("No Recent Contacts");
            list.setVisibility(View.GONE);
            search.setVisibility(View.GONE);
        }
    }

}

@Override
public void onResume()
{
    Log.e("STEP","4");
    super.onResume();
}

}

Answer 1

更改您的以下代码

if (charText.length() == 0)
{
    coverList.addAll(orig);
}

有了这个

if (charText.length() == 0)
{
    coverList.addAll(orig);
    notifyDataSetChanged();
}

这对你有用。

Answer 2

替换以下行：

 if (recent_list.size() > 0)
        {
            rec_ContactsAdapter.filter(text);
        }

        else
        {
                rec_ContactsAdapter = new RecentContactsAdapter(getActivity(), recent_list);
                rec_list.setAdapter(rec_ContactsAdapter);

        }

与：

rec_ContactsAdapter.filter(text);

并从 afterTextChanged() 中删除：

 search_adapter = new RecentContactsAdapter(getActivity(), recent_list);
 rec_list.setAdapter(rec_ContactsAdapter);

未找到搜索项目后列表视图清空，即使我清除搜索项目后仍为空

List View empties after searched item not found and remains empty even after i clear the searched item

search

android

listview

android-contacts