java - 如何使用卡片向 RecyclerView 添加 searchBar

Question

我正在从 JSON 数组中获取数据，并将其显示在 RecyclerView 上。我想实现一个搜索栏，以搜索和显示 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();
    }
}
}

Answer 1

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到您的适配器。到底是什么阻碍了你走这条路？