获取手机sd卡中的音乐并点击播放

  

package lipengfei.myapplication;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import java.io.File;import java.util.ArrayList;import java.util.HashMap;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Environment;import android.os.Handler;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.Window;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.widget.AdapterView;import android.widget.Button;import android.widget.ListView;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.SimpleAdapter;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements OnClickListener {    private static final String LOG = "MP3ListActivity";    private ListView lv;    private SeekBar seekBar;    private Button modelButton;    private Button backButton;    private Button pauseButton;    private Button nextButton;    private TextView nameText;    private ArrayList<HashMap<String, String>> musicList;    private ArrayList<String> musicpathlist;    private String path = Environment.getExternalStorageDirectory().getPath();    private String musicpath;    private String musicname;    private MediaPlayer mediaPlayer;    public int songNum; // 当前播放的歌曲在List中的下标    private boolean isStartTrackingTouch;    private Handler handler = new Handler();    private int Sequence = 1;//顺序播放    private int Shuffle = 2;//随机播放    private Button fristButton;    private Button secondButton;    String music = "/Music";    String mp3 = "/mp3";    int i = 0;    int flag = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        this.requestWindowFeature(Window.FEATURE_NO_TITLE);        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lv = (ListView) findViewById(R.id.lv);        seekBar = (SeekBar) findViewById(R.id.seekBar);        modelButton = (Button) findViewById(R.id.model);        backButton = (Button) findViewById(R.id.back);        pauseButton = (Button) findViewById(R.id.pause);        nextButton = (Button) findViewById(R.id.next);        nameText = (TextView) findViewById(R.id.name);        fristButton = (Button) findViewById(R.id.list1);        secondButton = (Button) findViewById(R.id.list2);        musicList = new ArrayList<HashMap<String, String>>();        musicpathlist=new ArrayList<String>();        mediaPlayer = new MediaPlayer();        //获得视频列表,默认显示放松音乐        mp3List(music);        fristButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                //清空列表和保存的地址信息                musicpathlist.clear();                musicList.clear();                //获得视频列表                mp3List(music);            }        });        secondButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                //清空列表和保存的地址信息                musicpathlist.clear();                musicList.clear();                //冥想列表                mp3List(mp3);            }        });        pauseButton.setOnClickListener(this);        backButton.setOnClickListener(this);        modelButton.setOnClickListener(this);        nextButton.setOnClickListener(this);        //进度条监听器        seekBar.setOnSeekBarChangeListener(new MySeekBarListener());        nextButton.setOnTouchListener(new OnTouchListener() {            @Override            public boolean onTouch(View arg0, MotionEvent arg1) {                // TODO Auto-generated method stub                if(arg1.getAction() == MotionEvent.ACTION_DOWN){                }                else if(arg1.getAction() == MotionEvent.ACTION_UP){                }                return false;            }        });        backButton.setOnTouchListener(new OnTouchListener() {            @Override            public boolean onTouch(View view, MotionEvent event) {                // TODO Auto-generated method stub                if(event.getAction() == MotionEvent.ACTION_DOWN){                }                else if(event.getAction() == MotionEvent.ACTION_UP){                }                return false;            }        });//        pauseButton.setOnTouchListener(new OnTouchListener() {////          @Override//          public boolean onTouch(View arg0, MotionEvent arg1) {//              // TODO Auto-generated method stub//              int i = 0;//              i++;//              if(i % 2 == 0){////              }//              return false;//          }//      });    }    //获得视频列表    private void mp3List(String music){        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {            // File path = Environment.getExternalStorageDirectory();// 获得SD卡路径            System.out.println("path-------》" + path);            //File[] files = path.listFiles();// 读取            String musicPath = path + music;            getFileName(musicPath);  //视频列表            Log.i(LOG, musicPath);        }        SimpleAdapter adapter = new SimpleAdapter(this, musicList, R.layout.sd_list, new String[] { "name" }, new int[] { R.id.mp4 });        lv.setAdapter(adapter);        for (int i = 0; i < musicList.size(); i++) {            Log.i(LOG, "list.  name:  " + musicList.get(i));        }        lv.setOnItemClickListener(new ListView.OnItemClickListener(){            @Override            public void onItemClick(AdapterView<?> arg0, View view, int position,long id) {//             //顺序播放//             if(flag == 0){//                 songNum = position;//             }//             //随机播放//             else if(flag == 1){//                 songNum = (int)(Math.random()*musicList.size());;//          }                songNum = position;                initMediaPlayer(songNum);            }        });    }    //仅搜索当前目录下的文件    private void getFileName(String url) {        File files = new File(url);        File[] file = files.listFiles();        //先判断目录是否为空，否则会报空指针        if (files != null) {            for (File f : file) {                String fileName = f.getName();                if (fileName.endsWith(".mp3")||fileName.endsWith(".wav")) {                    HashMap<String, String> map = new HashMap<String, String>();                    String s = fileName.substring(0,fileName.lastIndexOf(".")).toString();                    //获取文件的地址                    musicpath = f.getPath();                    Log.i(LOG, "文件名mp3或wav：：   " + s);                    map.put("name", fileName);                    // map.put("mp3", f.getName());                    musicpathlist.add(musicpath);                    musicList.add(map);                }            }        }    }    //进度条监控    private final class MySeekBarListener implements OnSeekBarChangeListener {        //移动触发        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {        }        //起始触发        public void onStartTrackingTouch(SeekBar seekBar) {            isStartTrackingTouch = true;        }        //结束触发        public void onStopTrackingTouch(SeekBar seekBar) {            mediaPlayer.seekTo(seekBar.getProgress());            isStartTrackingTouch = false;        }    }    //如果是顺序播放    private void initMediaPlayer(int songNum){        musicname = musicpathlist.get(songNum);        Log.i(LOG, musicname);        if (musicname != null) {            try {                mediaPlayer.reset(); //重置多媒体                //指定音频文件地址                mediaPlayer.setDataSource(musicname);                //这是一个地址                String path = musicpathlist.get(songNum);                String Text[] = path.split("/");                Log.i(LOG, Text[5]);                //设置当前播放文件                nameText.setText(Text[Text.length - 1]);                Log.i(LOG, "播放");                //准备播放                mediaPlayer.prepare();                start();//          if (!mediaPlayer.isPlaying()) {//              mediaPlayer.start();//              System.out.println("开始播放");//          }            } catch (Exception e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        switch (v.getId()) {            case R.id.pause:                Toast.makeText(getApplicationContext(), "暂停", Toast.LENGTH_SHORT).show();                pause();                break;            case R.id.next:                next();                break;            case R.id.back:                back();                break;            case R.id.model:                i++;                if(i % 2 == 1){                    Toast.makeText(getApplicationContext(), "随机播放", Toast.LENGTH_SHORT).show();                    //产生一个随机数//              songNum = (int)(Math.random()*musicList.size());//              System.out.println("song---" + songNum);//              initMediaPlayer(songNum);                    //随机播放falg                    flag = 1;                }                else{                    Toast.makeText(getApplicationContext(), "循环播放", Toast.LENGTH_SHORT).show();                    //循环播放                    flag = 0;                }                break;            default:                break;        }    }    public void start() {        try {            mediaPlayer.start();//开始播放            //设置进度条长度            seekBar.setMax(mediaPlayer.getDuration());            //发送一个Runnable, handler收到之后就会执行run()方法            handler.post(new Runnable() {                public void run() {                    // 更新进度条状态                    if (!isStartTrackingTouch)                        //获取当前播放音乐的位置                        seekBar.setProgress(mediaPlayer.getCurrentPosition());                    // 1秒之后再次发送                    handler.postDelayed(this, 1000);                }            });            //setOnCompletionListener 当当前多媒体对象播放完成时发生的事件            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {                public void onCompletion(MediaPlayer arg0) {                    next();//如果当前歌曲播放完毕,自动播放下一首.                }            });        } catch (Exception e) {            Log.v("MusicService", e.getMessage());        }    }    public void next() {        Toast.makeText(getApplicationContext(), "下一首", Toast.LENGTH_SHORT).show();        if(flag == 0){            songNum = songNum == musicList.size() - 1 ? 0 : songNum + 1;        }        else if(flag == 1){            songNum = (int)(Math.random()*musicList.size());        }        initMediaPlayer(songNum);    }    public void back() {        Toast.makeText(getApplicationContext(), "上一首", Toast.LENGTH_SHORT).show();        if(flag == 0){            //songNum = songNum == 0 ? musicList.size() - 1 : songNum - 1;            songNum = songNum - 1 < 0 ? musicList.size() - 1 : songNum - 1;        }        else if(flag == 1){            songNum = (int)(Math.random()*musicList.size());        }        initMediaPlayer(songNum);    }    public void pause() {        if (mediaPlayer.isPlaying())  {            Toast.makeText(getApplicationContext(), "继续", Toast.LENGTH_SHORT).show();            mediaPlayer.pause();        }        else            mediaPlayer.start();    }    public void stop() {        if (mediaPlayer.isPlaying()) {            mediaPlayer.stop();        }    }    @Override    protected void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        if (mediaPlayer != null) {            mediaPlayer.stop();            //mediaPlayer.release();        }    }}