我正在尝试从支持库中实现SearchView。我希望用户能够在RecyclerView中搜索/过滤帖子列表。
到目前为止，我已经按照一些教程进行了操作，并将SearchView添加到了ActionBar中，但还不确定从何处去。我看到了一些示例，但是当用户开始在SearchView中键入内容时，它们都没有显示结果。
PostAdapter.java：
import android.content.Context;
import android.content.Intent;
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 com.bumptech.glide.Glide;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;
import java.util.ArrayList;
import java.util.List;
public class PostAdapter extends RecyclerView.Adapter<PostAdapter.PostViewHolder> implements Filterable {
private Context context;
private List<Item> items;
private List<Item> mFilteredList;
public PostAdapter(Context context, List<Item> items) {
this.context = context;
this.items = items;
}
@Override
public PostViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.post_item, parent, false);
return new PostViewHolder(view);
}
@Override
public void onBindViewHolder(PostViewHolder holder, int position) {
final Item item = items.get(position);
holder.postTitle.setText(item.getTitle());
Document document = Jsoup.parse(item.getContent());
Elements elements = document.select("img");
Glide.with(context).load(elements.get(0).attr("src")).into(holder.postImage);
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(context, DetailActivity.class);
intent.putExtra("pid", item.getId());
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return items.size();
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charString = charSequence.toString();
if (charString.isEmpty()) {
mFilteredList = items;
} else {
ArrayList<Item> filteredList = new ArrayList<>();
for (Item item : items) {
if (item.getTitle().toLowerCase().contains(charString) || item.getContent().toLowerCase().contains(charString)) {
filteredList.add(item);
}
}
mFilteredList = filteredList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = mFilteredList;
return filterResults;
}
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
mFilteredList = (List<Item>) filterResults.values;
notifyDataSetChanged();
}
};
}
public class PostViewHolder extends RecyclerView.ViewHolder {
ImageView postImage;
TextView postTitle;
public PostViewHolder(View itemView) {
super(itemView);
postImage = (ImageView) itemView.findViewById(R.id.postImage);
postTitle = (TextView) itemView.findViewById(R.id.postTitle);
}
}
}
我的MainActivity.java：
public class MainActivity extends AppCompatActivity {
DrawerLayout drawerLayout;
Toolbar toolbar;
ActionBarDrawerToggle actionBarDrawerToggle;
NavigationView navigationView;
RecyclerView recyclerView;
LinearLayoutManager manager;
PostAdapter adapter;
List<Item> items = new ArrayList<>();
Boolean isScrolling = false;
int currentItems, totalItems, scrollOutItems;
String token = "";
SpinKitView progress;
Context context;
SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.postList);
manager = new LinearLayoutManager(this);
adapter = new PostAdapter(this, items);
recyclerView.setLayoutManager(manager);
recyclerView.setAdapter(adapter);
progress = (SpinKitView) findViewById(R.id.spin_kit);
setUpToolbar();
// Navigation Menu Start//
navigationView = (NavigationView) findViewById(R.id.navigation_menu);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home: {
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.enter, R.anim.exit);
}
break;
case R.id.nav_downloads: {
Intent intent = new Intent(getApplicationContext(), DlActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.enter, R.anim.exit);
}
break;
case R.id.nav_settings: {
Intent intent = new Intent(getApplicationContext(), SettingsActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.enter, R.anim.exit);
}
break;
case R.id.nav_contact_us: {
Intent intent = new Intent(getApplicationContext(), ContactActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.enter, R.anim.exit);
}
break;
case R.id.nav_policy: {
Intent intent = new Intent(getApplicationContext(), PolicyActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.enter, R.anim.exit);
}
break;
case R.id.nav_share: {
final String appPackageName = getApplication().getPackageName();
String shareBody = "Download " + getString(R.string.app_name) + " From : " + "http://play.google.com/store/apps/details?id=" + appPackageName;
Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
sharingIntent.setType("text/plain");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
sharingIntent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.app_name));
startActivity(Intent.createChooser(sharingIntent, getResources().getString(R.string.app_name)));
}
break;
case R.id.nav_rate: {
final String appPackageName = getApplication().getPackageName();
try {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + appPackageName)));
} catch (android.content.ActivityNotFoundException anfe) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://play.google.com/store/apps/details?id=" + appPackageName)));
}
}
break;
case R.id.nav_exit: {
finish();
}
}
return false;
}
});
/// Navigation menu End ///
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
isScrolling = true;
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
currentItems = manager.getChildCount();
totalItems = manager.getItemCount();
scrollOutItems = manager.findFirstVisibleItemPosition();
if (isScrolling && (currentItems + scrollOutItems == totalItems)) {
isScrolling = false;
getData();
}
}
});
getData();
if (!isConnected(MainActivity.this)) buildDialog(MainActivity.this).show();
else {
}
}
private void setUpToolbar() {
drawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.app_name, R.string.app_name);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
actionBarDrawerToggle.syncState();
}
protected void getData() {
String url = BloggerApi.url + "?key=" + BloggerApi.key;
if (token != "") {
url = url + "&pageToken=" + token;
}
if (token == null) {
return;
}
progress.setVisibility(View.VISIBLE);
final Call<PostList> postList = BloggerApi.getService().getPostList(url);
postList.enqueue(new Callback<PostList>() {
@Override
public void onResponse(Call<PostList> call, Response<PostList> response) {
PostList list = response.body();
token = list.getNextPageToken();
items.addAll(list.getItems());
adapter.notifyDataSetChanged();
Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
progress.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<PostList> call, Throwable t) {
Toast.makeText(MainActivity.this, "Error Occured", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu2, menu);
MenuItem search = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(search);
search(searchView);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
private void search(SearchView searchView) {
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
if (adapter != null) adapter.getFilter().filter(newText);
return true;
}
});
}
public boolean isConnected(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netinfo = cm.getActiveNetworkInfo();
if (netinfo != null && netinfo.isConnectedOrConnecting()) {
android.net.NetworkInfo wifi = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if ((mobile != null && mobile.isConnectedOrConnecting()) || (wifi != null && wifi.isConnectedOrConnecting()))
return true;
else return false;
} else
return false;
}
public AlertDialog.Builder buildDialog(Context c) {
AlertDialog.Builder builder = new AlertDialog.Builder(c);
builder.setTitle("No Internet Connection");
builder.setMessage("Please switch on your Mobile Data or Wifi Connection. Press ok to Exit");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
return builder;
}
}