我从JSON数组中获取数据，并在RecyclerView上显示它。我想实现一个搜索栏，以搜索和显示该RecyclerView中的元素。
MyRecyclerAdapter.java
public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerAdapter.CustomViewHolder> {
private List<FeedItem> feedItemList;
private Context mContext;
public MyRecyclerAdapter(Context context, List<FeedItem> feedItemList) {
this.feedItemList = feedItemList;
this.mContext = context;
}
@Override
public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_row, null);
CustomViewHolder viewHolder = new CustomViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(CustomViewHolder customViewHolder, int i) {
FeedItem feedItem = feedItemList.get(i);
//Setting text view title
customViewHolder.textView.setText(Html.fromHtml(feedItem.getTitle()));
customViewHolder.contactTV.setText(Html.fromHtml(feedItem.getContact()));
customViewHolder.emailTV.setText(Html.fromHtml(feedItem.getEmail()));
customViewHolder.eventname.setText(Html.fromHtml(feedItem.getEventname()));
customViewHolder.collegename.setText(Html.fromHtml(feedItem.getCollegename()));
//Handle click event on both title and image click
customViewHolder.textView.setOnClickListener(clickListener);
customViewHolder.textView.setTag(customViewHolder);
// Set the view to fade in
//setFadeAnimation(customViewHolder.itemView);
}
/*private void setFadeAnimation(View view) {
AlphaAnimation anim = new AlphaAnimation(0.0f, 1.0f);
anim.setDuration(800);
view.startAnimation(anim);
}*/
View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
CustomViewHolder holder = (CustomViewHolder) view.getTag();
int position = holder.getPosition();
FeedItem feedItem = feedItemList.get(position);
Toast.makeText(mContext, feedItem.getTitle(), Toast.LENGTH_SHORT).show();
}
};
@Override
public int getItemCount() {
return (null != feedItemList ? feedItemList.size() : 0);
}
public class CustomViewHolder extends RecyclerView.ViewHolder
{
protected TextView textView ,contactTV, emailTV, collegename, eventname;
protected ImageView callIcon, mailIcon, eventIcon;
public CustomViewHolder(View view)
{
super(view);
this.textView = (TextView) view.findViewById(R.id.title);
this.contactTV = (TextView) view.findViewById(R.id.contactTV);
this.emailTV = (TextView) view.findViewById(R.id.emailTV);
this.eventname = (TextView) view.findViewById(R.id.eventname);
this.collegename = (TextView) view.findViewById(R.id.collegename);
this.callIcon = (ImageView) view.findViewById(R.id.callIcon);
this.mailIcon = (ImageView) view.findViewById(R.id.mailIcon);
this.eventIcon = (ImageView) view.findViewById(R.id.eventIcon);
}
}
}
AdminActivity.java
public class AdminActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
private static final String TAG = "userList";
private List<FeedItem> feedsList;
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
private ProgressBar progressBar;
private TextView ParticipantsCounts;
int count=0;
private int number;
private SwipeRefreshLayout swipeRefreshLayout;
private final String url="http://bmcctroika.hol.es/get-data.php";;
private int offSet = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setDisplayShowHomeEnabled(true);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin);
// Initialize recycler view
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
ParticipantsCounts= (TextView) findViewById(R.id.ParticipantsCount);
// Downloading data from below url
new AsyncHttpTask().execute(url);
new AsyncHttpRecordTask().execute(url);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
refreshitems();
}
});
}
private void refreshitems()
{
new AsyncHttpTask().execute(url);
new AsyncHttpRecordTask().execute(url);
}
@Override
public void onRefresh()
{
new AsyncHttpTask().execute(url);
new AsyncHttpRecordTask().execute(url);
}
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected void onPreExecute() {
setProgressBarIndeterminateVisibility(true);
}
@Override
protected Integer doInBackground(String... params) {
Integer result = 0;
HttpURLConnection urlConnection;
try {
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
// 200 represents HTTP OK
if (statusCode == 200)
{
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null)
{
response.append(line);
}
parseResult(response.toString());
result = 1; // Successful
} else {
result = 0; //"Failed to fetch data!";
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result; //"Failed to fetch data!";
}
@Override
protected void onPostExecute(Integer result)
{
// Download complete.
progressBar.setVisibility(View.GONE);
if (result == 1)
{
adapter = new MyRecyclerAdapter(AdminActivity.this, feedsList);
mRecyclerView.setAdapter(adapter);
} else
{
Toast.makeText(AdminActivity.this, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
swipeRefreshLayout.setRefreshing(false);
}
}
private void parseResult(String result)
{
try
{
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("result");
feedsList = new ArrayList<>();
for (int i = 0; i < posts.length(); i++)
{
JSONObject post = posts.optJSONObject(i);
FeedItem item = new FeedItem();
item.setTitle(post.optString("fullname"));
item.setContact(post.optString("contactno"));
item.setEmail(post.optString("emailaddress"));
item.setEventname(post.optString("eventname"));
item.setCollegename(post.optString("collegename"));
feedsList.add(item);
}
//ParticipantsCounts.setText(String.valueOf(posts.length()));
}
catch (JSONException e)
{
e.printStackTrace();
}
}
public class AsyncHttpRecordTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
Integer result = 0;
HttpURLConnection urlConnection;
try {
URL url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
int statusCode = urlConnection.getResponseCode();
// 200 represents HTTP OK
if (statusCode == 200)
{
BufferedReader r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = r.readLine()) != null)
{
response.append(line);
}
parseResultnum(response.toString());
result = 1; // Successful
} else {
result = 0; //"Failed to fetch data!";
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
return result; //"Failed to fetch data!";
}
}
private void parseResultnum(String result)
{
try
{
JSONObject response = new JSONObject(result);
JSONArray posts = response.optJSONArray("result");
ParticipantsCounts.setText("No. of Participants : "+String.valueOf(posts.length()));
}
catch (JSONException e)
{
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
您可以使用actionView（example）轻松地将SearchView添加到ActionBar作为菜单项。然后基于SearchView.OnQueryTextListener，您将能够将搜索查询应用于您的适配器。究竟是什么阻碍了你走上这条道路？
答案 1 :(得分：0)
试试此代码
1）MainActivity.class
public class MainActivity extends AppCompatActivity {
private static final String TAG = "userList";
private RecyclerView mRecyclerView;
private MyRecyclerAdapter adapter;
private TextView ParticipantsCounts;
private ArrayList<HashMap<String, String>> list;
private HashMap<String, String> listsub;
private Context context;
private SwipeRefreshLayout swipeRefreshLayout;
private final String urlmain = "http://bmcctroika.hol.es/get-data.php";
private ProgressDialog pDialog;
private Integer result = 0;
private HttpURLConnection urlConnection;
private URL url;
private int statusCode;
private StringBuilder response;
private BufferedReader r;
private String line;
private JSONArray posts;
private SearchView search;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = MainActivity.this;
search = (SearchView) findViewById(R.id.search);
// Initialize recycler view
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
ParticipantsCounts = (TextView) findViewById(R.id.ParticipantsCount);
// Downloading data from below url
new AsyncHttpTask().execute(urlmain);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
refreshitems();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void refreshitems() {
new AsyncHttpTask().execute(urlmain);
}
public class AsyncHttpTask extends AsyncTask<String, Void, Integer> {
@Override
protected void onPreExecute() {
pDialog = new ProgressDialog(context);
pDialog.setMessage("Please wait");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Integer doInBackground(String... params) {
data1(params);
return result; //"Failed to fetch data!";
}
@Override
protected void onPostExecute(Integer result) {
pDialog.dismiss();
// Download complete.
if (result == 1) {
ParticipantsCounts.setText("No. of Participants : " + String.valueOf(posts.length()));
if (list.size() > 0) {
mRecyclerView.setLayoutManager(new LinearLayoutManager(mRecyclerView.getContext()));
adapter = new MyRecyclerAdapter(mRecyclerView.getContext(), list);
mRecyclerView.setAdapter(adapter);
search.setOnQueryTextListener(listener);
} else {
Toast.makeText(context, "No list found!", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(context, "Failed to fetch data!", Toast.LENGTH_SHORT).show();
}
}
}
SearchView.OnQueryTextListener listener = new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String query) {
query = query.toLowerCase();
final ArrayList<HashMap<String, String>> filteredList = new ArrayList<>();
for (int i = 0; i < list.size(); i++) {
final String text = list.get(i).toString().toLowerCase();
if (text.contains(query)) {
filteredList.add(list.get(i));
}
}
mRecyclerView.setLayoutManager(new LinearLayoutManager(mRecyclerView.getContext()));
adapter = new MyRecyclerAdapter(mRecyclerView.getContext(), filteredList);
mRecyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
return true;
}
};
private void data1(String... params) {
try {
url = new URL(params[0]);
urlConnection = (HttpURLConnection) url.openConnection();
statusCode = urlConnection.getResponseCode();
// 200 represents HTTP OK
if (statusCode == 200) {
r = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
response = new StringBuilder();
while ((line = r.readLine()) != null) {
response.append(line);
}
parseResult(response.toString());
result = 1; // Successful
} else {
result = 0; //"Failed to fetch data!";
}
} catch (Exception e) {
Log.d(TAG, e.getLocalizedMessage());
}
}
private void parseResult(String result) {
try {
JSONObject response = new JSONObject(result);
posts = response.optJSONArray("result");
list = new ArrayList<>();
Log.e("posts", "posts" + posts.length());
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.optJSONObject(i);
listsub = new HashMap<>();
listsub.put("fullname", post.optString("fullname"));
listsub.put("contactno", post.optString("contactno"));
listsub.put("emailaddress", post.optString("emailaddress"));
listsub.put("eventname", post.optString("eventname"));
listsub.put("collegename", post.optString("collegename"));
list.add(listsub);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
2）activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<SearchView
android:id="@+id/search"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginTop="10dp"
android:background="@android:color/holo_blue_dark"
android:hint="Search here"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:textColor="@android:color/black"
android:textColorHint="@android:color/black"
android:textSize="15dp" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_margin="10dp">
<TextView
android:id="@+id/ParticipantsCount"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@android:color/black"
android:textSize="15dp" />
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>
3）MyRecyclerAdapter.class
public class MyRecyclerAdapter extends RecyclerView.Adapter<MyRecyclerAdapter.ViewHolder> {
private ArrayList<HashMap<String, String>> list;
private HashMap<String, String> listsub;
private Context mContext;
View view;
public static class ViewHolder extends RecyclerView.ViewHolder {
public final View mView;
public TextView textView, contactTV, emailTV, collegename, eventname;
public ViewHolder(View view) {
super(view);
mView = view;
this.textView = (TextView) view.findViewById(R.id.title);
this.contactTV = (TextView) view.findViewById(R.id.contactTV);
this.emailTV = (TextView) view.findViewById(R.id.emailTV);
this.eventname = (TextView) view.findViewById(R.id.eventname);
this.collegename = (TextView) view.findViewById(R.id.collegename);
}
}
public MyRecyclerAdapter(Context context, ArrayList<HashMap<String, String>> feedItemList) {
list = feedItemList;
this.mContext = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_row, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int postion) {
listsub = list.get(postion);
//Setting text view title
holder.textView.setText(listsub.get("fullname"));
holder.contactTV.setText(listsub.get("contactno"));
holder.emailTV.setText(listsub.get("emailaddress"));
holder.eventname.setText(listsub.get("eventname"));
holder.collegename.setText(listsub.get("collegename"));
}
@Override
public int getItemCount() {
return list.size();
}
}
4）list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/title"
android:textSize="13dp"
android:textColor="@android:color/black" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/contactTV"
android:textSize="13dp"
android:textColor="@android:color/black" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/emailTV"
android:textSize="13dp"
android:textColor="@android:color/black" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/eventname"
android:textSize="13dp"
android:textColor="@android:color/black" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/collegename"
android:textSize="13dp"
android:textColor="@android:color/black" />
<TextView
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/black" />
</LinearLayout>
答案 2 :(得分：0)
这正是您所寻找的，这是搜索和回收查看的完整示例
private RecyclerView mRecyclerView;
private ExampleAdapter mAdapter;
private List<ExampleModel> mModels;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_main, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mModels = new ArrayList<>();
for (String movie : MOVIES) {
mModels.add(new ExampleModel(movie));
}
mAdapter = new ExampleAdapter(getActivity(), mModels);
mRecyclerView.setAdapter(mAdapter);
}
有关详情，请参阅此Searchable-RecyclerView-Demo