samples/SupportLeanbackDemos/src/com/example/android/leanback/SearchFragment.java

package com.example.android.leanback;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v17.leanback.widget.ArrayObjectAdapter;
import android.support.v17.leanback.widget.HeaderItem;
import android.support.v17.leanback.widget.ListRow;
import android.support.v17.leanback.widget.ListRowPresenter;
import android.support.v17.leanback.widget.ObjectAdapter;
import android.support.v17.leanback.widget.OnItemClickedListener;
import android.support.v17.leanback.widget.Row;
import android.text.TextUtils;
import android.util.Log;

public class SearchFragment extends android.support.v17.leanback.app.SearchFragment
    implements android.support.v17.leanback.app.SearchFragment.SearchResultProvider {
    private static final String TAG = "leanback.SearchFragment";
    private static final int NUM_ROWS = 3;
    private static final int SEARCH_DELAY_MS = 300;

    private ArrayObjectAdapter mRowsAdapter;
    private Handler mHandler = new Handler();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());

        setBadgeDrawable(getActivity().getResources().getDrawable(R.drawable.ic_title));
        setTitle("Leanback Sample App");
        setSearchResultProvider(this);
        setOnItemClickedListener(new ItemClickedListener());
    }

    @Override
    public ObjectAdapter getResultsAdapter() {
        return mRowsAdapter;
    }

    @Override
    public boolean onQueryTextChange(String newQuery) {
        Log.i(TAG, String.format("Search Query Text Change %s", newQuery));
        mRowsAdapter.clear();
        if (!TextUtils.isEmpty(newQuery)) {
            mHandler.removeCallbacks(mDelayedLoad);
            mHandler.postDelayed(mDelayedLoad, SEARCH_DELAY_MS);
        }
        return true;
    }

    @Override
    public boolean onQueryTextSubmit(String query) {
        Log.i(TAG, String.format("Search Query Text Submit %s", query));
        mRowsAdapter.clear();
        if (!TextUtils.isEmpty(query)) {
            mHandler.removeCallbacks(mDelayedLoad);
            mHandler.postDelayed(mDelayedLoad, SEARCH_DELAY_MS);
        }
        return true;
    }

    private void loadRows() {
        for (int i = 0; i < NUM_ROWS; ++i) {
            ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(new StringPresenter());
            listRowAdapter.add("Hello world");
            listRowAdapter.add("This is a test");
            HeaderItem header = new HeaderItem(i, "Row " + i, null);
            mRowsAdapter.add(new ListRow(header, listRowAdapter));
        }
    }

    private Runnable mDelayedLoad = new Runnable() {
        @Override
        public void run() {
            loadRows();
        }
    };
    private final class ItemClickedListener implements OnItemClickedListener {
        public void onItemClicked(Object item, Row row) {
            // TODO: use a fragment transaction instead of launching a new
            // activity
            Intent intent = new Intent(getActivity(), DetailsActivity.class);
            startActivity(intent);
        }
    }
}