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GNU General Public License
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package com.kure.musicplayer.activities; /*ww w . ja v a 2 s . c o m*/ import java.util.ArrayList; import android.content.Context; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.preference.PreferenceManager; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast; import com.kure.musicplayer.NotificationMusic; import com.kure.musicplayer.R; import com.kure.musicplayer.helpers.SingleToast; import com.kure.musicplayer.kMP; /** * First screen that the user sees - the Main Menu. * * Must listen for clicks so we can change to the other * sub menus (Activities). * * Thanks for providing a basic ListView navigation layout: * http://stackoverflow.com/q/19476948 */ public class ActivityMenuMain extends ActivityMaster implements OnItemClickListener { /** * All the possible items the user can select on this menu. * * Will be initialized with default values on `onCreate`. */ public static final ArrayList<String> items = new ArrayList<String>(); // Adapter that will convert from Strings to List Items public static ArrayAdapter<String> adapter = null; /** * List that will be populated with all the items. * * Look for it inside the res/layout xml files. */ ListView listView; /** * ID we'll use when calling the settings window. * It'll say if the user changed theme or not. * * @see onActivityResult() */ static final int USER_CHANGED_THEME = 1; // These variables are used to allow allow user to // press twice to exit the program // (showing a message when pressing the first time). private boolean backPressedOnce = false; private Handler backPressedHandler = new Handler(); /** How long to wait to disable double-pressing to quit */ private static final int BACK_PRESSED_DELAY = 2000; /** Action that actually disables double-pressing to quit */ private final Runnable backPressedTimeoutAction = new Runnable() { @Override public void run() { backPressedOnce = false; } }; /** * Called when the activity is created for the first time. */ @Override protected void onCreate(Bundle seventhSonOfASeventhSon) { // We need to load the settings right before creating // the first activity so that the user-selected theme // will be applied to the first screen. // // Loading default settings at the first time the app; // is loaded. PreferenceManager.setDefaultValues(this, R.xml.preferences, false); kMP.settings.load(this); super.onCreate(seventhSonOfASeventhSon); setContentView(R.layout.activity_main_menu); // Adding all possible items on the main menu. items.add(getString(R.string.menu_main_music)); items.add(getString(R.string.menu_main_settings)); items.add(getString(R.string.menu_main_shuffle)); if (kMP.mainMenuHasNowPlayingItem) items.add(getString(R.string.menu_main_now_playing)); // ListView to be populated with the menu items listView = (ListView)findViewById(R.id.activity_main_menu_list); // Thing that converts the menu items to the ListView adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items); // Filling teh list with all the items listView.setAdapter(adapter); // We'll get warned when the user clicks on an item. listView.setOnItemClickListener(this); // Initializing the main program logic. kMP.initialize(this); scanSongs(false); } /** * Starts the background process of scanning the songs. * * @param forceScan If we should scan again. You should set * this to true if you want to scan again * the database. * Otherwise, leave it `false` so we don't * rescan the songs when this Activity * is created again for some reason. */ void scanSongs(boolean forceScan) { // Loading all the songs from the device on a different thread. // We'll only actually do it if they weren't loaded already // // See the implementation right at the end of this class. if ((forceScan) || (! kMP.songs.isInitialized())) { SingleToast.show(ActivityMenuMain.this, getString(R.string.menu_main_scanning), Toast.LENGTH_LONG); new ScanSongs().execute(); } } /** * Will react to the user selecting an item. */ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // Gets the string value of the current item and // compares to all possible items. String currentItem = listView.getItemAtPosition(position).toString(); if (currentItem.equals(getString(R.string.menu_main_music))) { startActivity(new Intent(this, ActivityMenuMusic.class)); } else if (currentItem.equals(getString(R.string.menu_main_settings))) { // Let's start the settings screen. // While doing so, we need to know if the user have // changed the theme. // If he did, we'll refresh the screen. // See `onActivityResult()` Intent settingsIntent = new Intent(this, ActivityMenuSettings.class); startActivityForResult(settingsIntent, USER_CHANGED_THEME); } else if (currentItem.equals(getString(R.string.menu_main_shuffle))) { // Can only jump to shuffle all songs if we've // scanned all the songs from the device. if (! kMP.songs.isInitialized()) { SingleToast.show(this, getString(R.string.menu_music_proceed_error), Toast.LENGTH_LONG); return; } // Shuffle all songs kMP.nowPlayingList = kMP.songs.getSongs(); Intent nowPlayingIntent = new Intent(this, ActivityNowPlaying.class); nowPlayingIntent.putExtra("sort", "random"); nowPlayingIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(nowPlayingIntent); } else if (currentItem.equals(getString(R.string.menu_main_now_playing))) { // Jump to Now Playing screen startActivity(new Intent(this, ActivityNowPlaying.class)); } else { } } /** * When destroying the Activity. */ @Override protected void onDestroy() { super.onDestroy(); if (backPressedHandler != null) backPressedHandler.removeCallbacks(backPressedTimeoutAction); // Need to clear all the items otherwise // they'll keep adding up. items.clear(); // Cancell all thrown Notifications NotificationMusic.cancelAll(this); kMP.stopMusicService(this); } /** * We're overriding the default behavior for when the * user presses the back button. * * This way, it will show "Please click BACK again to exit" * and if the user presses again it will quit. * * Thanks, guys at StackOverflow: * http://stackoverflow.com/a/13578600 */ @Override public void onBackPressed() { if (this.backPressedOnce) { // Default behavior, quit it super.onBackPressed(); kMP.forceExit(this); return; } this.backPressedOnce = true; SingleToast.show(this, getString(R.string.menu_main_back_to_exit), Toast.LENGTH_SHORT); backPressedHandler.postDelayed(backPressedTimeoutAction, BACK_PRESSED_DELAY); } /** * Activity is about to become visible - let's start the music * service. */ @Override protected void onStart() { super.onStart(); kMP.startMusicService(this); } // HELPER METHODS /** * Does an action on another Thread. * * On this case, we'll scan the songs on the Android device * without blocking the main Thread. * * It gives a nice pop-up when finishes. * * Source: * http://answers.oreilly.com/topic/2699-how-to-handle-threads-in-android-and-what-you-need-to-watch-for/ */ class ScanSongs extends AsyncTask<String, Integer, String> { /** * The action we'll do in the background. */ @Override protected String doInBackground(String... params) { try { // Will scan all songs on the device kMP.songs.scanSongs(ActivityMenuMain.this, "external"); return ActivityMenuMain.this.getString(R.string.menu_main_scanning_ok); } catch (Exception e) { Log.e("Couldn't execute background task", e.toString()); e.printStackTrace(); return ActivityMenuMain.this.getString(R.string.menu_main_scanning_not_ok); } } /** * Called once the background processing is done. */ @Override protected void onPostExecute(String result) { super.onPostExecute(result); SingleToast.show(ActivityMenuMain.this, result, Toast.LENGTH_LONG); } } /** * Adds a new item "Now Playing" on the main menu, if * it ain't there yet. */ public static void addNowPlayingItem(Context c) { if (kMP.mainMenuHasNowPlayingItem) return; ActivityMenuMain.items.add(c.getString(R.string.menu_main_now_playing)); kMP.mainMenuHasNowPlayingItem = true; // Refresh ListView adapter.notifyDataSetChanged(); } }