安卓第十七天笔记--简易版本音乐播放器（

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title:简易版本音乐播放器

简易版本音乐播放器

1.布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:gravity="center_horizontal">    <Button        android:id="@+id/musicList"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"        android:background="#86B2F4"        android:text="音乐文件列表"        android:textColor="#fff"        android:textSize="28sp"/>    <ImageView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:src="@drawable/logo"/>    <SeekBar        android:id="@+id/seekBar"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center_horizontal">        <ImageButton            android:id="@+id/stop"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/stop"/>        <ImageButton            android:id="@+id/pre"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/pree"/>        <ImageButton            android:id="@+id/play"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/play"/>        <ImageButton            android:id="@+id/next"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/next"/>    </LinearLayout></LinearLayout>

2.工具类

/** * Created by  刘楠 on 2016-03-05 19:39. * 文件过滤器工具类, * 用于过滤指定后缀的文件 */public class MusicFileNameFilter implements FilenameFilter {    private String type;    public MusicFileNameFilter(String type) {        this.type = type;    }    @Override    public boolean accept(File dir, String filename) {        return filename.endsWith(type);    }}

3.Binder接口

/** * Created by  刘楠 on 2016-03-05 20:41. */public interface IMusicPlayerService {    public void callplay(String path);    ;    public  void callStop();    public boolean callIsPlaying();    public int callGetgetDuration();    public int callGetgetCurrentDuration();    public boolean callMediaIsNull();    public void callChanageSeek(int position);    public void callPause();}

4. service

            /**         * Created by  刘楠 on 2016-03-05 20:32.         *         * Servie音乐播放         */        public class MusicPlayerService extends Service {            private MediaPlayer mediaPlayer;            private MusicPlayerBinder musicPlayerBinder = new MusicPlayerBinder();            private class MusicPlayerBinder extends Binder implements IMusicPlayerService {                public void callplay(String path) {                    play(path);                }                @Override                public void callStop() {                    stop();                }                @Override                public boolean callIsPlaying() {                    return isPlaying();                }                @Override                public int callGetgetDuration() {                    return getgetDuration();                }                @Override                public int callGetgetCurrentDuration() {                    return getCurrentDuration();                }                @Override                public boolean callMediaIsNull() {                    return mediaIsNull();                }                @Override                public void callChanageSeek(int position) {                    chanageSeek(position);                }                @Override                public void callPause() {                    pause();                }            }            @Nullable            @Override            public IBinder onBind(Intent intent) {                return musicPlayerBinder;            }            /**             * 初始化             * @param path             */            private void init(String path) {                if (mediaPlayer == null) {                    mediaPlayer = new MediaPlayer();                    reset(path);                }else{                    reset(path);                }            }            /**             * 资源重置             * @param path             */            private void reset(String path) {                    try {                        mediaPlayer.reset();                        mediaPlayer.setDataSource(path);                        mediaPlayer.prepare();                        mediaPlayer.setLooping(true);                        mediaPlayer.start();                    } catch (IOException e) {                        e.printStackTrace();                    }            }            /**             * 播放             * @param path             */            private void play(String path) {              /*  if (mediaPlayer != null && mediaPlayer.isPlaying()) {                    mediaPlayer.pause();                } else if (mediaPlayer != null&&!mediaPlayer.isPlaying()) {                    mediaPlayer.start();                } else {                    init(path);                }*/                init(path);            }            /**             * 是不是在播放             * @return             */            private boolean isPlaying(){                if(mediaPlayer!=null) {                    return mediaPlayer.isPlaying();                }                return false;            }            /**             * 获取总的进度             * @return             */            private int getgetDuration(){                return  mediaPlayer.getDuration();            }            /**             * 获取当前进度             * @return             */            private int getCurrentDuration(){                return mediaPlayer.getCurrentPosition();            }            /**             * 暂停             */            private void pause(){                if(mediaPlayer!=null&&mediaPlayer.isPlaying()){                    mediaPlayer.pause();                }else if(mediaPlayer!=null&&!mediaPlayer.isPlaying()){                    mediaPlayer.start();                }            }            /**             * 停止             */            private void stop(){                if(mediaPlayer!=null){                    mediaPlayer.stop();                    mediaPlayer.release();                    mediaPlayer=null;                }            }            /**             * 判断当前是不是NULL             * @return             */            private boolean mediaIsNull(){                return  mediaPlayer==null;            }            private void chanageSeek(int position){                mediaPlayer.seekTo(position);                mediaPlayer.start();            }        }

5.Activity

    public class MainActivity extends AppCompatActivity implements View.OnClickListener {        //音乐文件的目录        private static final String PATH = Environment.getExternalStorageDirectory() + "/Music/";        private static final String TAG = "MainActivity";        //文件路径        private ArrayList<String> fileList = new ArrayList<String>();        //文件名        private ArrayList<String> fileNameList = new ArrayList<String>();        /*        进度条         */        private SeekBar seekBar;        /*        音乐文件列表         */        private Button musicList;        /*        音乐控制按键         */        private ImageButton stop;        private ImageButton pre;        private ImageButton play;        private ImageButton next;        //单首音乐的路径        private String musicPath;        private IMusicPlayerService mPlayerService;        private MusicPlayerServiceConnection mConn;        private boolean mBound =false;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main);            /*            初始化             */            seekBar = (SeekBar) findViewById(R.id.seekBar);            musicList = (Button) findViewById(R.id.musicList);            stop = (ImageButton) findViewById(R.id.stop);            pre = (ImageButton) findViewById(R.id.pre);            ;            play = (ImageButton) findViewById(R.id.play);            ;            next = (ImageButton) findViewById(R.id.next);            ;            File file = new File(PATH);            //获取文件列表            File[] arrs = file.listFiles(new MusicFileNameFilter(".mp3"));            for (File f : arrs) {                //添加全路径到文件列表                fileList.add(f.getAbsolutePath());                //添加文件表到文件列表                fileNameList.add(f.getName());            }            /*            设置监听器             */            musicList.setOnClickListener(this);            stop.setOnClickListener(this);            pre.setOnClickListener(this);            play.setOnClickListener(this);            next.setOnClickListener(this);            seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {                @Override                public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                }                @Override                public void onStartTrackingTouch(SeekBar seekBar) {                }                //拖动进度条,改变播放进度                @Override                public void onStopTrackingTouch(SeekBar seekBar) {                    mPlayerService.callChanageSeek(seekBar.getProgress());                }            });        }        @Override        protected void onStart() {            super.onStart();            if(mConn==null){                mConn= new MusicPlayerServiceConnection();            }            Intent intent = new Intent(this,MusicPlayerService.class);            mBound = bindService(intent, mConn, BIND_AUTO_CREATE);        }        @Override        public void onClick(View v) {            switch (v.getId()) {                case R.id.musicList:                    showList();                    break;                case R.id.stop:                    stop();                    break;                case R.id.pre:                    pre();                    break;                case R.id.play:                    play();                    break;                case R.id.next:                    next();                    break;            }        }        /*        下一首         */        private void next() {            int index = fileList.indexOf(musicPath);            if(index>=fileList.size()){                index=0;            }            mPlayerService.callplay(fileList.get(index+1));        }        /*        播放         */        private void play() {            Log.d(TAG, "mBound" + mBound);            boolean isNull = mPlayerService.callMediaIsNull();            if(isNull) {                mPlayerService.callplay(musicPath);            }else{                mPlayerService.callPause();            }            if(mPlayerService.callIsPlaying()){                play.setImageBitmap(BitmapFactory.decodeResource(getResources(),R.drawable.pause));            }else{                play.setImageBitmap(BitmapFactory.decodeResource(getResources(),R.drawable.play));            }            //更新进度            new Thread(){                boolean isFinished=mPlayerService.callIsPlaying();                @Override                public void run() {                    if(isFinished) {                        while (isFinished) {                            SystemClock.sleep(200);                            int currentDuration = mPlayerService.callGetgetCurrentDuration();                            int duration = mPlayerService.callGetgetDuration();                            seekBar.setMax(duration);                            seekBar.setProgress(currentDuration);                            if (currentDuration >= duration) {                                isFinished = false;                            }                        }                    }                }            }.start();        }        /**         * 上一首         */        private void pre() {            int index = fileList.indexOf(musicPath);            if(index<=0){                index=fileList.size()-1;            }            mPlayerService.callplay(fileList.get(index-1));        }        /**         * 停止播放         */        private void stop() {            mPlayerService.callStop();        }        /**         * 显示音乐列表         */        private void showList() {            Intent intent = new Intent(this,MusicListActivity.class);            //intent.putStringArrayListExtra("filelist",fileList);            intent.putStringArrayListExtra("filenamelist",fileNameList);            startActivityForResult(intent,100);        }        @Override        protected void onActivityResult(int requestCode, int resultCode, Intent data) {            super.onActivityResult(requestCode, resultCode, data);            if(data==null){                Toast.makeText(MainActivity.this, "没有结果", Toast.LENGTH_SHORT).show();                return;            }            //获取下标            int position = data.getIntExtra("position", 0);            //设置音乐路径            musicPath = fileList.get(position);           // play();            Log.d(TAG,musicPath);        }        private class MusicPlayerServiceConnection implements ServiceConnection{            @Override            public void onServiceConnected(ComponentName name, IBinder service) {                mPlayerService = (IMusicPlayerService) service;            }            @Override            public void onServiceDisconnected(ComponentName name) {                if(mConn!=null){                 mConn =null;                }            }        }        @Override        protected void onStop() {            super.onStop();            if(mConn!=null){                unbindService(mConn);                mConn=null;                mPlayerService=null;            }        }        @Override        protected void onDestroy() {            super.onDestroy();            if(mConn!=null){                unbindService(mConn);                mConn=null;                mPlayerService=null;            }        }    }