你好朋友请帮我，我正在使用Recylerview并实现了searchfilter，但问题是，当我单击item时，在recylerview中搜索该项目后，它总是返回该项目的0位置，我想要列表项的实际位置，请在这里提供帮助我的代码在recylerview中搜索项目后如何获得实际位置recylerview
这是我的代码
package bible.swordof.God;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.view.MenuItemCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, SearchView.OnQueryTextListener {
private ListView listView;
private ArrayList<String> books;
private ArrayList<String> bookid;
private ListViewAdapter adapter;
private DatabaseHelper mDBHelper = null;
private SQLiteDatabase mDb = null;
BookRecyclerAdopter bookRecyclerAdopter;
//life is awesome
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
setData();
RecyclerView bookanme = findViewById(R.id.list);
bookanme.setLayoutManager(new LinearLayoutManager(this));
bookRecyclerAdopter = new BookRecyclerAdopter(this, books);
bookanme.setAdapter(bookRecyclerAdopter);
/* adapter = new ListViewAdapter(MainActivity.this, R.layout.item_listview, books, bookid);
listView.setAdapter(adapter);*/
/* listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int booknumber=position;
String bookname=bookid.get(position);
Toast.makeText(MainActivity.this, ""+bookname, Toast.LENGTH_SHORT).show();
*//* Intent intent=new Intent(MainActivity.this,Chapters.class);
intent.putExtra("booknumber",booknumber);
intent.putExtra("bookname",bookname);
startActivity(intent);*//*
}
});
}
*/
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.search_voice_btn:
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
if (intent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(intent, 10);
} else {
Toast.makeText(this, "Your Device Don't Support Speech Input", Toast.LENGTH_SHORT).show();
}
break;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case 10:
if (resultCode == RESULT_OK && data != null) {
ArrayList<String> result = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
Toast.makeText(this, "" + result.get(0), Toast.LENGTH_SHORT).show();
}
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
MenuItem myActionMenuItem = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(myActionMenuItem);
searchView.setOnQueryTextListener(this);
return true;
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
Fragment fragment;
int id = item.getItemId();
if (id == R.id.home) {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
} else if (id == R.id.favoruite) {
Intent intent = new Intent(this, Favourite.class);
startActivity(intent);
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private void setData() {
books = new ArrayList<>();
bookid = new ArrayList<>();
mDBHelper = new DatabaseHelper(this);
mDb = mDBHelper.getReadableDatabase();
Cursor cursor = mDb.rawQuery("select b,n from key_english", new String[]{});
if (cursor != null && cursor.getCount() > 0) {
if (cursor.moveToFirst()) {
do {
books.add(cursor.getString(1));
bookid.add(cursor.getString(0));
} while (cursor.moveToNext());
}
}
}
@Override
public boolean onQueryTextSubmit(String s) {
return false;
}
@Override
public boolean onQueryTextChange(String newtext) {
String userinput = newtext.toLowerCase();
List<String> newlist = new ArrayList<>();
for (String name : books) {
if (name.toLowerCase().contains(userinput)) {
newlist.add(name);
}
}
bookRecyclerAdopter.updatelist(newlist);
return true;
}
}
package bible.swordof.God;
import android.app.Activity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.amulyakhare.textdrawable.TextDrawable;
import com.amulyakhare.textdrawable.util.ColorGenerator;
import java.util.ArrayList;
import java.util.List;
public class BookRecyclerAdopter extends RecyclerView.Adapter<BookRecyclerAdopter.Booksholder>{
private List<String> bookname;
Context context;
public BookRecyclerAdopter(Context context,List<String> bookname) {
this.bookname = bookname;
this.context=context;
}
public class Booksholder extends RecyclerView.ViewHolder {
private ImageView imageView;
private TextView bookname;
public Booksholder(@NonNull View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.image_view);
bookname = (TextView) itemView.findViewById(R.id.text);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
}
@Override
public Booksholder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());
View view = inflater.inflate(R.layout.item_listview, viewGroup, false);
return new Booksholder(view);
}
@Override
public void onBindViewHolder(@NonNull Booksholder booksholder, final int i) {
booksholder.bookname.setText(bookname.get(i));
//get first letter of each String item
String firstLetter = String.valueOf(bookname.get(i).charAt(0));
ColorGenerator generator = ColorGenerator.MATERIAL; // or use DEFAULT
// generate random color
int color = generator.getColor(bookname.get(i));
TextDrawable drawable = TextDrawable.builder()
.buildRound(firstLetter, color); // radius in px
booksholder.imageView.setImageDrawable(drawable);
}
@Override
public int getItemCount() {
return bookname.size();
}
public void updatelist(List<String>newlist){
bookname=new ArrayList<>();
bookname.addAll(newlist);
notifyDataSetChanged();
}
}
答案 0 :(得分：0)
您将需要维护一个单独的书名列表。我们称之为filteredBookname。最初将其设置为bookname。
public class BookRecyclerAdopter extends RecyclerView.Adapter<BookRecyclerAdopter.Booksholder>{
private List<String> bookname;
private List<String> filteredBookname;
Context context;
public BookRecyclerAdopter(Context context,List<String> bookname) {
this.bookname = bookname;
this.filteredBookname = bookname
this.context=context;
}
...
// other pieces of code.
，而不是使用bookname来填充RecyclerView项，而是使用filteredBookname
，您的更新列表方法将是
public void updatelist(List<String>newlist){
filteredBookname=new ArrayList<>();
filteredBookname.addAll(newlist);
notifyDataSetChanged();
}
使用上述方法，您始终可以在原始列表bookname中找到您商品的正确位置
答案 1 :(得分：0)
原因是您选择了错误的列表，请从过滤后的适配器列表/模型中选择您的数据。
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Books booksdata= (Books)adapterName.bookname.get(position);
Toast.makeText(MainActivity.this, ""+booksdata.bookname, Toast.LENGTH_SHORT).show();
Intent intent=new Intent(MainActivity.this,Chapters.class);
intent.putExtra("booknumber",booksdata.booknumber);
intent.putExtra("bookname",booksdata.bookname);
startActivity(intent);
}
});
}