1600802032

         一、实现的功能

           1.实现播放，暂停，停止，播放上一首，下一首功能  

           2.  显示播放列表

           3. 至少可以播放3首歌曲

        二、项目实现

1. 对音乐播放器界面截图

       

        2.实现功能的关键代码 ：

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        UIinit();
        logic();
        musicList();
        activityReceiver = new ActivityReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(UPDATE_ACTION);
        registerReceiver(activityReceiver, filter);
        intentservice = new Intent(this, MusicService.class);
        startService(intentservice);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
 
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public void UIinit() {
        play_pause = (ImageButton) this.findViewById(R.id.play_pause);
        stop = (ImageButton) this.findViewById(R.id.stop);
        onplay = (ImageButton) this.findViewById(R.id.onplay);
        close = (ImageButton) this.findViewById(R.id.close);
        downplay = (ImageButton) this.findViewById(R.id.downplay);
    }

    public void logic() {
        play_pause.setOnClickListener(this);
        stop.setOnClickListener(this);
        onplay.setOnClickListener(this);
        downplay.setOnClickListener(this);
        close.setOnClickListener(this);
    }

    @Override
    public void onClick(View source) {
        Intent intent = new Intent(CTL_ACTION);
        switch (source.getId()) {
            case R.id.play_pause: {
                intent.putExtra("control", 1);
                break;
            }
            case R.id.stop: {
                intent.putExtra("control", 2);
                break;
            }
            case R.id.onplay: {
                intent.putExtra("control", 3);
                break;
            }
            case R.id.downplay: {
                intent.putExtra("control", 4);
                break;
            }
            case R.id.close: {
                this.finish();
                break;
            }

        }
        sendBroadcast(intent);

    }


    public class ActivityReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
 
            int update = intent.getIntExtra("update", -1);
            switch (update) {
                case 0x11: {
                    play_pause.setImageResource(R.drawable.play);
                    status = 0x11;
                    break;
                }

             
                case 0x12: {
                    
                    play_pause.setImageResource(R.drawable.pause);
                    
                    status = 0x12;
                    break;
                }
             
                case 0x13: {
                    play_pause.setImageResource(R.drawable.play);
                    status = 0x13;
                    break;
                }
            }
        }

    }

    
    public void musicList() {
      
        String[] music = new String[] { Media._ID, Media.DISPLAY_NAME,
                Media.TITLE, Media.DURATION, Media.ARTIST, Media.DATA };
        Cursor cursor = getContentResolver().query(Media.EXTERNAL_CONTENT_URI,
                music, null, null, null);
        while (cursor.moveToNext()) {
            Music temp = new Music();
            temp.setFilename(cursor.getString(1));
            temp.setTitle(cursor.getString(2));
            temp.setDuration(cursor.getInt(3));
            temp.setArtist(cursor.getString(4));
            temp.setData(cursor.getString(5));
            musiclists.add(temp);

            Map<String, Object> map = new HashMap<String, Object>();
            map.put("name", cursor.getString(1));
            map.put("artist", cursor.getString(4));
            list.add(map);
        }

        ListView listview = (ListView) findViewById(R.id.musics);
        SimpleAdapter adapter = new SimpleAdapter(this, list,
                R.layout.musicsshow, new String[] { "name", "artist" },
                new int[] { R.id.name, R.id.artist });
        listview.setAdapter(adapter);
        listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int current, long id) {

                Intent intent=new Intent(CTL_ACTION);
                intent.putExtra("control", 5);
                intent.putExtra("current", current);
                sendBroadcast(intent);
            }
        });
    }
}

        3.代码链接:https://git.coding.net/yibula/Music.git

        4.apk的下载地址:https://coding.net/u/yibula/p/Music/git/raw/master/1600802032/1600802032.apk

        5.录屏链接：https://www.bilibili.com/video/av39908039/