playlistbrowseractivity.java

Android平台上的media player, iPhone风格

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.imusic;

import java.text.Collator;
import java.util.ArrayList;

import android.app.ListActivity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;

import com.android.internal.database.ArrayListCursor;
import android.database.Cursor;
import android.database.MergeCursor;
import android.media.AudioManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.provider.MediaStore;
import android.util.Log;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.AdapterContextMenuInfo;

public class PlaylistBrowserActivity extends ListActivity
    implements View.OnCreateContextMenuListener, MusicUtils.Defs
{
    private static final int DELETE_PLAYLIST = CHILD_MENU_BASE + 1;
    private static final int EDIT_PLAYLIST = CHILD_MENU_BASE + 2;
    private static final int RENAME_PLAYLIST = CHILD_MENU_BASE + 3;
    private static final int CHANGE_WEEKS = CHILD_MENU_BASE + 4;
    private static final long RECENTLY_ADDED_PLAYLIST = -1;
    private static final long ALL_SONGS_PLAYLIST = -2;

    private boolean mCreateShortcut;

    public PlaylistBrowserActivity()
    {
    }

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);

        final Intent intent = getIntent();
        final String action = intent.getAction();
        if (Intent.ACTION_CREATE_SHORTCUT.equals(action)) {
            mCreateShortcut = true;
        }

        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setVolumeControlStream(AudioManager.STREAM_MUSIC);
        MusicUtils.bindToService(this, new ServiceConnection() {
            public void onServiceConnected(ComponentName classname, IBinder obj) {
                if (Intent.ACTION_VIEW.equals(action)) {
                    long id = Long.parseLong(intent.getExtras().getString("playlist"));
                    if (id == RECENTLY_ADDED_PLAYLIST) {
                        playRecentlyAdded();
                    } else if (id == ALL_SONGS_PLAYLIST) {
                        int [] list = MusicUtils.getAllSongs(PlaylistBrowserActivity.this);
                        if (list != null) {
                            MusicUtils.playAll(PlaylistBrowserActivity.this, list, 0);
                        }
                    } else {
                        MusicUtils.playPlaylist(PlaylistBrowserActivity.this, id);
                    }
                    finish();
                }
            }

            public void onServiceDisconnected(ComponentName classname) {
            }
        
        });
        IntentFilter f = new IntentFilter();
        f.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);
        f.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
        f.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
        f.addDataScheme("file");
        registerReceiver(mScanListener, f);

        init();
    }
    
    
    
    @Override
    public void onDestroy() {
        MusicUtils.unbindFromService(this);
        if (mPlaylistCursor != null) {
            mPlaylistCursor.close();
        }        
        unregisterReceiver(mScanListener);
        super.onDestroy();
    }
    
    @Override
    public void onResume() {
        super.onResume();

        MusicUtils.setSpinnerState(this);
    }
    @Override
    public void onPause() {
        mReScanHandler.removeCallbacksAndMessages(null);
        super.onPause();
    }
    private BroadcastReceiver mScanListener = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            MusicUtils.setSpinnerState(PlaylistBrowserActivity.this);
            mReScanHandler.sendEmptyMessage(0);
        }
    };
    
    private Handler mReScanHandler = new Handler() {
        public void handleMessage(Message msg) {
            init();
            if (mPlaylistCursor == null) {
                sendEmptyMessageDelayed(0, 1000);
            }
        }
    };
    public void init() {

        mPlaylistCursor = getPlaylistCursor(null);

        if (mPlaylistCursor == null) {
            MusicUtils.displayDatabaseError(this);
            setContentView(R.layout.no_sd_card);
            return;
        }

        setContentView(R.layout.media_picker_activity);

        if (mPlaylistCursor.getCount() > 0) {
            mPlaylistCursor.moveToFirst();

            setTitle(R.string.playlists_title);
        } else {
            setTitle(R.string.no_playlists_title);
        }

        // Map Cursor columns to views defined in media_list_item.xml
        PlaylistListAdapter adapter = new PlaylistListAdapter(
                this,
                R.layout.track_list_item,
                mPlaylistCursor,
                new String[] { MediaStore.Audio.Playlists.NAME},
                new int[] { android.R.id.text1 });

        setListAdapter(adapter);
        ListView lv = getListView();
        lv.setOnCreateContextMenuListener(this);
        lv.setTextFilterEnabled(true);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (!mCreateShortcut) {
            menu.add(0, GOTO_START, 0, R.string.goto_start).setIcon(
                    R.drawable.ic_menu_music_library);
            menu.add(0, GOTO_PLAYBACK, 0, R.string.goto_playback).setIcon(
                    R.drawable.ic_menu_playback).setVisible(MusicUtils.isMusicLoaded());
        }
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Intent intent;
        switch (item.getItemId()) {
            case GOTO_START:
                intent = new Intent();
                intent.setClass(this, MusicBrowserActivity.class);
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);
                return true;

            case GOTO_PLAYBACK:
                intent = new Intent("com.android.imusic.PLAYBACK_VIEWER");
                startActivity(intent);
                return true;
        }
        return super.onOptionsItemSelected(item);
    }
    
    public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfoIn) {