Java tutorial
/* * Copyright (C) 2015 Naman Dwivedi * * Licensed under the GNU General Public License v3 * * This is free software: you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. */ package com.ht117.dina.activities; import android.content.Context; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.view.MenuItemCompat; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.SearchView; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.inputmethod.InputMethodManager; import com.ht117.dina.R; import com.ht117.dina.adapters.SearchAdapter; import com.ht117.dina.dataloaders.AlbumLoader; import com.ht117.dina.dataloaders.ArtistLoader; import com.ht117.dina.dataloaders.SongLoader; import com.ht117.dina.models.Album; import com.ht117.dina.models.Artist; import com.ht117.dina.models.Song; import com.ht117.dina.provider.SearchHistory; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.concurrent.Executor; import java.util.concurrent.Executors; public class SearchActivity extends BaseThemedActivity implements SearchView.OnQueryTextListener, View.OnTouchListener { private final Executor mSearchExecutor = Executors.newSingleThreadExecutor(); @Nullable private AsyncTask mSearchTask = null; private SearchView mSearchView; private InputMethodManager mImm; private String queryString; private SearchAdapter adapter; private RecyclerView recyclerView; private List<Object> searchResults = Collections.emptyList(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_search); mImm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); recyclerView = (RecyclerView) findViewById(R.id.recyclerview); recyclerView.setLayoutManager(new LinearLayoutManager(this)); adapter = new SearchAdapter(this); recyclerView.setAdapter(adapter); } @Override public boolean onCreateOptionsMenu(final Menu menu) { getMenuInflater().inflate(R.menu.menu_search, menu); mSearchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.menu_search)); mSearchView.setOnQueryTextListener(this); mSearchView.setQueryHint(getString(R.string.search_library)); mSearchView.setIconifiedByDefault(false); mSearchView.setIconified(false); MenuItemCompat.setOnActionExpandListener(menu.findItem(R.id.menu_search), new MenuItemCompat.OnActionExpandListener() { @Override public boolean onMenuItemActionExpand(MenuItem item) { return true; } @Override public boolean onMenuItemActionCollapse(MenuItem item) { finish(); return false; } }); menu.findItem(R.id.menu_search).expandActionView(); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case android.R.id.home: finish(); return true; default: break; } return super.onOptionsItemSelected(item); } @Override public boolean onQueryTextSubmit(final String query) { onQueryTextChange(query); hideInputManager(); return true; } @Override public boolean onQueryTextChange(final String newText) { if (newText.equals(queryString)) { return true; } if (mSearchTask != null) { mSearchTask.cancel(false); mSearchTask = null; } queryString = newText; if (queryString.trim().equals("")) { searchResults.clear(); adapter.updateSearchResults(searchResults); adapter.notifyDataSetChanged(); } else { mSearchTask = new SearchTask().executeOnExecutor(mSearchExecutor, queryString); } return true; } @Override public boolean onTouch(View v, MotionEvent event) { hideInputManager(); return false; } @Override protected void onDestroy() { if (mSearchTask != null && mSearchTask.getStatus() != AsyncTask.Status.FINISHED) { mSearchTask.cancel(false); } super.onDestroy(); } public void hideInputManager() { if (mSearchView != null) { if (mImm != null) { mImm.hideSoftInputFromWindow(mSearchView.getWindowToken(), 0); } mSearchView.clearFocus(); SearchHistory.getInstance(this).addSearchString(queryString); } } private class SearchTask extends AsyncTask<String, Void, ArrayList<Object>> { @Override protected ArrayList<Object> doInBackground(String... params) { ArrayList<Object> results = new ArrayList<>(27); List<Song> songList = SongLoader.searchSongs(SearchActivity.this, params[0], 10); if (!songList.isEmpty()) { results.add(getString(R.string.songs)); results.addAll(songList); } if (isCancelled()) { return null; } List<Album> albumList = AlbumLoader.getAlbums(SearchActivity.this, params[0], 7); if (!albumList.isEmpty()) { results.add(getString(R.string.albums)); results.addAll(albumList); } if (isCancelled()) { return null; } List<Artist> artistList = ArtistLoader.getArtists(SearchActivity.this, params[0], 7); if (!artistList.isEmpty()) { results.add(getString(R.string.artists)); results.addAll(artistList); } if (results.size() == 0) { results.add(getString(R.string.nothing_found)); } return results; } @Override protected void onPostExecute(ArrayList<Object> objects) { super.onPostExecute(objects); mSearchTask = null; if (objects != null) { adapter.updateSearchResults(objects); adapter.notifyDataSetChanged(); } } } }