我是 Android 开发新手。我使用 Arrayadopter 自定义 ListView ，我的所有数据都是从 sqlite 数据库获取的，并在此自定义 ListView 中显示如何在操作栏上实现搜索功能我尝试了许多其他代码，但它不起作用在这里，请告诉我是否有经验丰富的开发人员可以帮助我，我非常感谢他，请告诉我？
My custom list adopter:
package bible.swordof.God;
import android.app.Activity;
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;
import com.amulyakhare.textdrawable.TextDrawable;
import com.amulyakhare.textdrawable.util.ColorGenerator;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
public class ListViewAdapter extends ArrayAdapter<String> {
private MainActivity activity;
private List<String> friendList;
private List<String> searchList;
public ListViewAdapter(MainActivity context, int resource, List<String> objects) {
super(context, resource, objects);
this.activity = context;
this.friendList = objects;
this.searchList = new ArrayList<>();
this.searchList.addAll(friendList);
}
@Override
public int getCount() {
return friendList.size();
}
@Override
public String getItem(int position) {
return friendList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
// If holder not exist then locate all view from UI file.
if (convertView == null) {
// inflate UI from XML file
convertView = inflater.inflate(R.layout.item_listview, parent, false);
// get all UI view
holder = new ViewHolder(convertView);
// set tag for holder
convertView.setTag(holder);
} else {
// if holder created, get tag from view
holder = (ViewHolder) convertView.getTag();
}
holder.friendName.setText(getItem(position));
//get first letter of each String item
String firstLetter = String.valueOf(getItem(position).substring(0,1));
ColorGenerator generator = ColorGenerator.MATERIAL; // or use DEFAULT
// generate random color
int color = generator.getColor(getItem(position));
TextDrawable drawable = TextDrawable.builder()
.buildRound(firstLetter, color); // radius in px
holder.imageView.setImageDrawable(drawable);
return convertView;
}
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
friendList.clear();
if (charText.length() == 0) {
friendList.addAll(searchList);
} else {
for (String s : searchList) {
if (s.toLowerCase(Locale.getDefault()).contains(charText)) {
friendList.add(s);
}
}
}
notifyDataSetChanged();
}
private class ViewHolder {
private ImageView imageView;
private TextView friendName;
public ViewHolder(View v) {
imageView = (ImageView) v.findViewById(R.id.image_view);
friendName = (TextView) v.findViewById(R.id.text);
}
}
}
My Mainactivity where i implement search bar:
package bible.swordof.God;
import android.app.Activity;
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.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.MenuInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.app.SearchManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.SearchView.OnQueryTextListener;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import java.util.ArrayList;
import java.util.Locale;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private ListView listView;
private ArrayList<String> stringArrayList;
private ArrayAdapter<String> adapter;
private DatabaseHelper mDBHelper=null;
private SQLiteDatabase mDb=null;
//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();
listView =findViewById(R.id.list);
adapter = new ListViewAdapter(MainActivity.this, R.layout.item_listview, stringArrayList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int booknumber=position+1;
String bookname=stringArrayList.get(position);
//Toast.makeText(MainActivity.this, ""+booknumber, 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) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.main,menu);
MenuItem menuItem=menu.findItem(R.id.action_search);
SearchView searchView=(SearchView)menuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String s) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText)) {
adapter.getFilter().filter(newText);
listView.clearTextFilter();
} else {
adapter.getFilter().filter(newText);
}
return true;
}
});
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.nav_camera) {
} 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() {
stringArrayList = new ArrayList<>();
mDBHelper = new DatabaseHelper(this);
mDb = mDBHelper.getReadableDatabase();
Cursor cursor = mDb.rawQuery("select * from key_english", new String[]{});
if(cursor!=null && cursor.getCount() > 0)
{
if (cursor.moveToFirst())
{
do {
stringArrayList.add(cursor.getString(1));
} while (cursor.moveToNext());
}
}
}
}
My action search menu:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_search"
android:title="@string/search"
android:icon="@android:drawable/ic_menu_search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always" />
<item
android:id="@+id/search_voice_btn"
android:icon="@drawable/ic_mic"
app:showAsAction="always"
android:title="Voice Search" />
</menu>
最佳答案
对于您的适配器，您创建了一个名为 filter 的公共(public)方法，它不是真正的 Filter 类。我建议两种不同的方法可以使发布的代码正常工作。
方法 1:在 Activity 中，将adapter.getFilter().filter(newText);更改为adapter.filter(newText);。
方法2:由于您的数据是String列表，并且ArrayAdapter已经Filterable，因此保留adapter.getFilter().filter(newText); 并让适配器像这样简单:
public class ListViewAdapter extends ArrayAdapter {
private MainActivity activity;
public ListViewAdapter(MainActivity context, int resource, List<String> objects) {
super(context, resource, objects);
this.activity = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
// If holder not exist then locate all view from UI file.
if (convertView == null) {
// inflate UI from XML file
convertView = inflater.inflate(R.layout.item_listview, parent, false);
// get all UI view
holder = new ViewHolder(convertView);
// set tag for holder
convertView.setTag(holder);
} else {
// if holder created, get tag from view
holder = (ViewHolder) convertView.getTag();
}
String item = (String)getItem(position);
holder.friendName.setText(item);
//get first letter of each String item
String firstLetter = item.substring(0, 1);
ColorGenerator generator = ColorGenerator.MATERIAL; // or use DEFAULT
// generate random color
int color = generator.getColor(item);
TextDrawable drawable = TextDrawable.builder()
.buildRound(firstLetter, color); // radius in px
holder.imageView.setImageDrawable(drawable);
return convertView;
}
private class ViewHolder {
private ImageView imageView;
private TextView friendName;
public ViewHolder(View v) {
imageView = (ImageView) v.findViewById(R.id.image_view);
friendName = (TextView) v.findViewById(R.id.text);
}
}
}
我在 ListView 上的博客还包含带有过滤器的示例:http://programandroidlistview.blogspot.com/希望有帮助!
关于java - Android 操作栏使用 customlitview 进行搜索，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56303333/