Android小卷毛音乐播放器开发教程（一）

前言：2014年12月5号的时候，刚加入学校里的团队不久，组长会给新人发布任务，让我们在做项目的过程中能快速的熟悉android的各项基本知识。第一次的任务就是做一个android的音乐播放器。当时拿到任务的时候也是愣了≡￣﹏￣≡，什么都不知道，怎么做。然而身为一个程序员，速效的学习并且能灵活的使用，是一项必备的技能，面对问题，咱不能怂，怂就输一半儿，二话不说就是干。大二的小达课还是比较多的，抽出零碎的时间，还有牺牲周末等等，花了18天的时间，憋出了个播放器（辣鸡播放器，大神勿喷，初次接触android）。期间很感谢简美音乐播放器（作者：小巫）的许多易懂的教程，还有网上各路大神的代码，下面就展示下小达的成果。（小心被亮瞎，界面丑暴，23333）。

第一阶段完成的功能：

               1.获取歌曲并显示为歌曲列表

               2.点击列表自动播放

               3.暂停、上一首、下一首

               4.播放模式的选择

               5.自动切换到下一首

第二阶段完成的功能：

               1.歌词的动态显示（没有滚起来。。。）

               2.我的最爱歌曲加入和删除

               3.最近播放的歌曲记录

待完成的任务：

               1.专辑图片的获取（搞了好长时间没弄出来）

               2.来电的处理

               3.歌曲分享等模块

               4.创建自己的歌单

废话不多说，直接上源码。小卷毛音乐播放器下载

各位飘过的、路过的大神，代码写的有点乱，求轻喷，23333，刚接触android，求指点，我会好好的改正，谢谢咯。

小卷毛播放器的全貌，，，自己都不忍直视，这界面还是后来做到一半了改过的，没有设计师的苦逼程序猿，之前的那个ＵＩ丑的不能要。做完这个东西最大的体会就是，UI设计还是超重要的，改起来有点麻烦（好像是个人太水了哈。。。）。有人会问，，我这素材到哪里找的？木有设计师，只能自己默默的反编译天天动听了，，偷别人设计师的，23333，会在后面一篇双手奉上我的教程。

简单说一下，主界面能用的模块有我的音乐、我的最爱、最近播放。整个播放器我先用的是好多个Activity，但是做到中间发现Activity不怎么灵活，在学习的过程中发现有个东西叫Fragment（不要翻译成碎片，不然怪怪的，23333）。这个Fragment更加灵活方便。后来花了2天的时间边学边改，真是痛苦。将整个播放器只用了一个Activity，其余的全是fragment。

先贴出activity的源代码吧。

package com.example.dada.myapplication;import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.Notification;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Message;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import android.os.Handler;public class MainActivity extends Activity implements AppConstant,         //用Fragment的时候，Activity实现Fragment的内部接口MainFragment.OnMainFragmentInteractionListener,MyMusicFragment.OnMyMusicFragmentInteractionListener,PlayFragment.OnPlayFragmentInteractionListener,RecentlyPlayFragment.OnFragmentInteractionListener,MyFavoriteFragment.OnFragmentInteractionListener{private String music_url;                                              //记录音乐的路径private boolean isPause;                                               //记录当前播放器的是否暂停private boolean isChangToNext;                                         //下一首按钮private boolean notification_previous_music;                           //通知栏上一首private boolean notification_next_music;                               //通知栏下一首private boolean notification_pause_music;                              //通知栏停止播放private boolean notification_exit;                                     //通知栏退出private int index;                                                     //歌词的索引private int play_mode;                                                 //播放模式private int current_position;                                          //当前进度条的位置private int current_position_bar;private long exitTime;                                                 //记录连续按两次退出private MsgReceiver msgReceiver;                                       //Message的接收器,接收歌曲的信息private BarReceiver barReceiver;                                       //进度条的接收器private NotificationReceiver notificationReceiver;                     //通知栏广播接收器private Button latestPlayListButton;                                   //最近播放private ImageButton play_button;                                       //播放按钮控件private ImageButton previous_song_button;                              //上一首按钮private ImageButton next_song_button;                                  //下一首按钮控件private ImageButton play_mode_button;                                  //播放模式按钮private ListView music_list;                                           //音乐列表控件private ListView recently_play_music_list;                             //最近播放音乐列表private SeekBar seek_bar;                                              //进度条控件private Intent intent_to_service;                                      //向service发送广播的intentprivate Intent intent_to_fragment;                                     //向fragment发送广播的intentprivate Intent intent_to_changeMusic;                                  //换歌曲private Intent progress_change_intent_to_service;                      //进度条拖动private TextView music_info_textView;                                  //显示歌曲信息的textviewprivate TextView singer_info_textView;                                 //显示歌手信息的textviewprivate FindSongs finder;                                              //查找歌曲的类的实例private PopupWindow popupPlayModeWindow;                               //播放模式下拉窗口private MainFragment mainFragment;                                     //主要的fragmentprivate NotificationManager myNotificationManager;                     //通知栏Managerprivate Notification myNotification;                                   //通知栏private FragmentManager fragmentManager;                               //用于管理Fragment的相互切换private FragmentTransaction fragmentTransaction;                       /*FragmentManage：
FragmentManager能够实现管理activity中fragment. 通过调用activity的getFragmentManager()取得它的实例.FragmentTransaction：FragmentTransaction对fragment进行添加,移除,替换,以及执行其他动作。
从 FragmentManager 获得一个FragmentTransaction的实例 :FragmentManager fragmentManager = getFragmentManager(); 
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();*/private MyMusicFragment myMusicFragment;                               //我的音乐Fragment实例public static boolean isFavorite = false;                              //当前音乐是否为我的最爱public static String[] music_array = null;                             //自动补全的数组public static List<Mp3Info> mp3Infos;                                  //歌曲列表public static int music_position;                                      //音乐的位置public static MyDataBase myDataBase;                                   //自己封装的一个数据库类实例@Overridepublic void onMainFragmentInteraction(int message) {                                     //MainFragment的回调函数switch(message){case PlayerMsg.CHANGE_TO_MY_MUSIC_FRAGMENT:onMyMusicFragmentInteraction(PlayerMsg.CHANGE_TO_MY_MUSIC_FRAGMENT);break;case PlayerMsg.FRAGMENT_RANDOM_PLAY:changeMusic(PlayerMsg.RANDOM_MODE,AppConstant.PlayerMsg.NEXT_MUSIC,mp3Infos);Toast.makeText(this,"小卷毛为您点了一首歌",Toast.LENGTH_SHORT).show();}}@Overridepublic void onMyMusicFragmentInteraction(int message,int position) {                             //MyMusicFragment的回调函数if(message == PlayerMsg.LIST_CLICK){if (mp3Infos != null) {isPause = false;initService(position);}}}public void onMyMusicFragmentInteraction(int message) {                                          //MyMusicFragment回调函数myMusicFragment = new MyMusicFragment();FragmentManager fragmentManager = getFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.setCustomAnimations(R.animator.slide_in_left,R.animator.slide_out_right);switch(message){case PlayerMsg.CHANGE_TO_MY_MUSIC_FRAGMENT:fragmentTransaction.replace(R.id.fragment_layout, myMusicFragment);fragmentTransaction.addToBackStack(null);fragmentTransaction.commit();break;case PlayerMsg.BACK_TO_MAIN_FRAGMENT:fragmentTransaction.replace(R.id.fragment_layout, mainFragment);fragmentTransaction.addToBackStack(null);fragmentTransaction.commit();break;}}public void onPlayFragmentInteraction(int message){                     //PlayFragment的回调函数Mp3Info mp3_Info = mp3Infos.get(music_position);switch (message){case PlayerMsg.DISMISS_CLICK:myMusicFragment = new MyMusicFragment();FragmentManager fragmentManager = getFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.setCustomAnimations(R.animator.slide_in_up,R.animator.slide_out_down);fragmentTransaction.replace(R.id.fragment_layout, mainFragment);fragmentTransaction.addToBackStack(null);fragmentTransaction.commit();break;case PlayerMsg.ADD_TO_FAVORITE:isFavorite = true;mp3_Info.setFavorite(isFavorite);myDataBase.AddData(MyDataBase.TABLE_NAME_FAVORITE,(int)mp3_Info.getId(),mp3_Info.getTitle(),mp3_Info.getArtist(),mp3_Info.getDuration(),mp3_Info.getUrl(),(int)mp3_Info.getAlbum_id());break;case PlayerMsg.DELETE_FROM_FAVORITE:isFavorite = false;mp3Infos.get(music_position).setFavorite(isFavorite);myDataBase.DeleteData(MyDataBase.TABLE_NAME_FAVORITE,(int)mp3_Info.getId());break;}}public void onFragmentInteraction(){}public void onFragmentInteraction(int message,int position){
//        if(message == PlayerMsg.LIST_CLICK){
//            if (mp3Infos != null) {
//                isPause = false;
//                initService(position);
//            }
//        }}public void onFavoriteFragmentInteraction(){}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.activity_main);mainFragment = new MainFragment();fragmentManager = getFragmentManager();fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.replace(R.id.fragment_layout, mainFragment).commit();index = 0;exitTime = 0;music_position = 0;current_position = 0;play_mode = AppConstant.PlayerMsg.LOOP_MODE;isPause = true;finder = new FindSongs();msgReceiver = new MsgReceiver();barReceiver = new BarReceiver();notificationReceiver = new NotificationReceiver();View play_mode_window = this.getLayoutInflater().inflate(R.layout.popup_window_layout,null);popupPlayModeWindow = new PopupWindow(play_mode_window,280,360);music_list = (ListView)findViewById(R.id.music_list);recently_play_music_list = (ListView)findViewById(R.id.recently_play_music_list);play_button = (ImageButton)findViewById(R.id.play_button);seek_bar = (SeekBar)findViewById(R.id.process_bar);play_mode_button = (ImageButton)findViewById(R.id.play_mode_button);play_mode_button.setImageResource(R.drawable.play_mode_photo);next_song_button = (ImageButton)findViewById(R.id.next_song_button);latestPlayListButton = (Button)findViewById(R.id.latestPlayListButton);previous_song_button = (ImageButton)findViewById(R.id.previous_song_button);intent_to_service = new Intent("com.example.communication.PLAY");intent_to_fragment = new Intent("com.example.communication.MUSIC_LIST_SELECTOR");intent_to_changeMusic = new Intent("com.example.communication.ChANGE_MUSIC");progress_change_intent_to_service = new Intent("com.example.communication.PROGRESS_BAR");myDataBase = new MyDataBase(getApplicationContext(),recently_play_music_list);                         //实例化数据库类myDataBase.CreateDataBase();play_button.setImageResource(R.drawable.play_photo);play_button.setOnClickListener(new View.OnClickListener() {                                     //播放按钮的监听器@Overridepublic void onClick(View v) {if(isPause){isPause = false;play_button.setImageResource(R.drawable.pause_photo);}else{isPause = true;play_button.setImageResource(R.drawable.play_photo);}intent_to_service.putExtra("position",current_position);intent_to_service.putExtra("isPause",isPause);sendBroadcast(intent_to_service);}});mp3Infos = finder.getMp3Infos(getContentResolver());next_song_button.setOnClickListener(new View.OnClickListener() {             //下一首按钮的监听器@Overridepublic void onClick(View v) {changeMusic(play_mode,AppConstant.PlayerMsg.NEXT_MUSIC,mp3Infos);}});previous_song_button.setOnClickListener(new View.OnClickListener() {        //上一首按钮监听@Overridepublic void onClick(View v) {changeMusic(play_mode,AppConstant.PlayerMsg.PREVIOUS_MUSIC,mp3Infos);}});seek_bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {                             //进度条拖动响应@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {current_position_bar = seekBar.getProgress();progress_change_intent_to_service.putExtra("current_position",current_position_bar);sendBroadcast(progress_change_intent_to_service);}});play_mode_button.setOnClickListener(new View.OnClickListener() {                                        //播放模式按钮监听器@Overridepublic void onClick(View v) {if(popupPlayModeWindow.isShowing()){popupPlayModeWindow.dismiss();}else{if(play_mode == AppConstant.PlayerMsg.LOOP_MODE)Toast.makeText(getApplicationContext(), "当前模式为循环播放模式", Toast.LENGTH_SHORT).show();if(play_mode == AppConstant.PlayerMsg.RANDOM_MODE)Toast.makeText(getApplicationContext(),"当前模式为随机播放模式",Toast.LENGTH_SHORT).show();popupPlayModeWindow.showAsDropDown(v);}}});music_array = getMusicList();}@Overrideprotected void onStart() {IntentFilter intentMsgFilter = new IntentFilter();IntentFilter intentBarFilter = new IntentFilter();IntentFilter intentNotificationFilter = new IntentFilter();intentMsgFilter.addAction("com.example.communication.RECEIVER");        //注册歌曲信息的广播接收器registerReceiver(msgReceiver,intentMsgFilter);intentBarFilter.addAction("com.example.communication.BAR");             //注册进度条的广播接收器registerReceiver(barReceiver,intentBarFilter);intentNotificationFilter.addAction("com.example.communication.NOTIFICATION_TO_ACTIVITY");registerReceiver(notificationReceiver,intentNotificationFilter);super.onStart();}/*为了防止按返回键杀掉Activity，对返回键的按钮响应做了重写，* 连续按两次，检测间隔时间，达到时间要求直接返回桌面，* 和按home键效果类似。*/public boolean onKeyDown(int keyCode, KeyEvent event) {                                               if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){if((System.currentTimeMillis()-exitTime) > 2000){Toast.makeText(this, "再按一次返回桌面", Toast.LENGTH_SHORT).show();exitTime = System.currentTimeMillis();} else {Intent i = new Intent(Intent.ACTION_MAIN);i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);i.addCategory(Intent.CATEGORY_HOME);startActivity(i);}return true;}return super.onKeyDown(keyCode, event);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.menu_main, menu);return true;}/*在Activity界面按手机的更多选项按钮，弹出的选择框* * */@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();//noinspection SimplifiableIfStatementif (id == R.id.action_settings) {return true;}if(id == R.id.action_exit){System.exit(0);}return super.onOptionsItemSelected(item);}/** 接受从service发过来的广播* 包含歌曲名和艺术家名*/private class MsgReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {music_info_textView = (TextView)findViewById(R.id.music_info_textView);singer_info_textView = (TextView)findViewById(R.id.singer_info_textView);music_info_textView.setText(intent.getStringExtra("title"));singer_info_textView.setText(intent.getStringExtra("artist"));}}/** 接受从service发过来的广播* 更新进度条的当前位置*/private class BarReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {if(seek_bar.getMax() - current_position <= 1100 ){changeMusic(play_mode,AppConstant.PlayerMsg.NEXT_MUSIC,mp3Infos);}else{current_position = intent.getIntExtra("position",0);seek_bar.setProgress(current_position);}}}/** 接受从service发过来的广播* 通知栏的相关信息*/private class NotificationReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {notification_previous_music = intent.getBooleanExtra("notification_previous_music",false);notification_next_music = intent.getBooleanExtra("notification_next_music",false);notification_pause_music = intent.getBooleanExtra("notification_pause_music",false);notification_exit = intent.getBooleanExtra("notification_exit",false);if(notification_previous_music){changeMusic(play_mode,AppConstant.PlayerMsg.PREVIOUS_MUSIC,mp3Infos);}if(notification_next_music){changeMusic(play_mode,AppConstant.PlayerMsg.NEXT_MUSIC,mp3Infos);}if(notification_pause_music){play_button.setImageResource(R.drawable.play_photo);}else{play_button.setImageResource(R.drawable.pause_photo);}if(notification_exit){System.exit(0);}}}/** 自定义函数* 用来切歌* 传入的参数包含：当前播放模式(mode)、上一首还是下一首(msg)，歌曲的列表(List<Mp3Info> mp3Infos)*/private void changeMusic(int mode,int msg,List<Mp3Info> mp3Infos){isChangToNext = true;isPause = false;current_position = 0;play_button.setImageResource(R.drawable.pause_photo);switch (mode){case AppConstant.PlayerMsg.LOOP_MODE:switch (msg){case AppConstant.PlayerMsg.NEXT_MUSIC:if(music_position < mp3Infos.size() - 1 )music_position ++;elsemusic_position = 0;break;case AppConstant.PlayerMsg.PREVIOUS_MUSIC:if(music_position >=  1 )music_position --;elsemusic_position = mp3Infos.size() - 1;break;}break;case AppConstant.PlayerMsg.RANDOM_MODE:music_position = (int)(Math.random() * (mp3Infos.size() - 1));break;}try{initService(music_position);Mp3Info mp3_Info = mp3Infos.get(music_position);isFavorite = mp3_Info.getFavorite();intent_to_fragment.putExtra("selector_position",music_position);                    //发广播,改变listView_selector的位置sendBroadcast(intent_to_fragment);music_url = mp3_Info.getUrl();music_info_textView.setText(mp3_Info.getTitle());singer_info_textView.setText(mp3_Info.getArtist());seek_bar.setMax((int)mp3_Info.getDuration());intent_to_service.putExtra("isPause",isPause);intent_to_changeMusic.putExtra("music_title",mp3_Info.getTitle());intent_to_changeMusic.putExtra("music_artist",mp3_Info.getArtist());intent_to_changeMusic.putExtra("music_url",music_url);intent_to_changeMusic.putExtra("isChangeToNext",isChangToNext);sendBroadcast(intent_to_service);sendBroadcast(intent_to_changeMusic);isChangToNext = false;//            SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
//            Date curDate = new Date();long time = System.currentTimeMillis();if(myDataBase.IsExistData(MyDataBase.TABLE_NAME,(int)mp3_Info.getId())){   //最近播放存在该歌曲就更新播放时间,不存在就加入数据库myDataBase.UpdateData(MyDataBase.TABLE_NAME,(int)mp3_Info.getId(),time);}else{myDataBase.AddData(MyDataBase.TABLE_NAME,(int)mp3_Info.getId(),mp3_Info.getTitle(),mp3_Info.getArtist(),mp3_Info.getDuration(),mp3_Info.getUrl(),(int)mp3_Info.getAlbum_id(),time);}}catch(Exception e){e.printStackTrace();}}/** 播放模式的popupwindow里按键监听器* 在布局文件里面注册的监听器*/public void loop_play_mode_listener(View v){Toast.makeText(getApplicationContext(),"更改为循环播放模式",Toast.LENGTH_SHORT).show();play_mode = AppConstant.PlayerMsg.LOOP_MODE;play_mode_button.setImageResource(R.drawable.play_mode_photo);popupPlayModeWindow.dismiss();}/** 播放模式的popupwindow里按键监听器* 在布局文件里面注册的监听器*/public void random_play_mode_listener(View v){Toast.makeText(getApplicationContext(),"更改为随机播放模式",Toast.LENGTH_SHORT).show();play_mode = AppConstant.PlayerMsg.RANDOM_MODE;play_mode_button.setImageResource(R.drawable.random_play_mode);popupPlayModeWindow.dismiss();}/** Activity下方控制台的点击监听* 在布局文件里面注册的监听器* 点击后会切换至另外一个Fragment，专门用来显示歌词的playFragment*/public void main_activity_bottom_layout_listener(View v){String current_music_url = mp3Infos.get(music_position).getUrl();PlayFragment playFragment = PlayFragment.newInstance(current_music_url);FragmentManager fragmentManager = getFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();fragmentTransaction.setCustomAnimations(R.animator.slide_in_up,R.animator.slide_out_down);fragmentTransaction.replace(R.id.fragment_layout, playFragment);fragmentTransaction.addToBackStack(null);fragmentTransaction.commit();}/** 初始化一个service* 用于在后台播放歌曲* 独立于activity*/private void initService(int position) {music_position = position;Mp3Info mp3Info = mp3Infos.get(position);Intent intent = new Intent("com.example.communication.MSG_ACTION");play_button.setImageResource(R.drawable.pause_photo);intent.putExtra("url", mp3Info.getUrl());intent.putExtra("title", mp3Info.getTitle());intent.putExtra("artist", mp3Info.getArtist());intent.putExtra("album", mp3Info.getAlbum());intent.putExtra("album_id", mp3Info.getAlbum_id());intent.putExtra("MSG", AppConstant.PlayerMsg.PLAY_MSG);intent.setClass(MainActivity.this, PlayerService.class);seek_bar.setMax((int) (mp3Info.getDuration()));startService(intent);}/** 这个是把所有的歌曲标题获取，存放到一个String类型数组里* 用于AutoCompleTextView的自动补全*/public static String[] getMusicList(){String[] str = new String[mp3Infos.size() - 1];for(int i = 0;i < mp3Infos.size() - 1;i++){str[i] = mp3Infos.get(i).getTitle();}return str;}/** 这个可以忽略* 用于实现我的最爱和最近播放列表的点击播放* 没有弄好*/public static int findPosition(String url){int position = 0;while(position < mp3Infos.size()){if(url.equals(mp3Infos.get(position).getUrl())){return position;}else{position++;}}return -1;}
}

今天就先写这么多啦，小达会再抽时间继续奉上我的（辣鸡）教程的，23333。