Android简易的音乐播放器实现

1.在sdcard中获取音频文件，实现音乐播放。并且音乐播放要放在服务当中避免受到Activity生命周期影响。

2.使用SeekBar进行拖动时要暂停音乐的播放，避免拖动时进度条的更新。

3.在使用MediaPlayer时要注意重新装载音频文件后要要调用reset()重置。

布局文件很简单这里就不贴出来了。

MainActivity.java

package com.example.musicplayer;import android.content.Intent;import android.os.Environment;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.SeekBar;import android.widget.TextView;import java.io.File;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private Button bt_sp, bt_next, bt_qt;    private static TextView tv_crt, tv_tol;    private static SeekBar seekBar;    static int count = 0;                    //count为偶数表示暂停，奇数表示播放    static ArrayList list;           //存放所有音乐名    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        bt_sp.setOnClickListener(this);        bt_next.setOnClickListener(this);        bt_qt.setOnClickListener(this);        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  //当seekBar被持续拖动时回调                 Log.e("changed", progress + ""); int current = (int) (progress * MusicService.mp.getDuration() / 1000.0);                tv_crt.setText(new SimpleDateFormat("mm:ss").format(current));  //更新拖动进度                       }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {               //当seekBar被拖动时回调                if (bt_sp.getText().toString().equals("暂停")) {                //当音乐在播放时拖动                    count--;                    Intent in = new Intent(MainActivity.this, MusicService.class)                            .putExtra("switch", 0xffffffff);                    startService(in);                } else {                                                    //暂停时拖动                    Intent in = new Intent(MainActivity.this, MusicService.class)                            .putExtra("switch", 0xffffffff);                    startService(in);                }            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                 //当seekBar拖动停止时回调                count++;                int progress = seekBar.getProgress();                int current = (int) (progress * MusicService.mp.getDuration() / 1000.0);                MusicService.mp.seekTo(current);                                  //在拖动位置处播放                Intent in = new Intent(MainActivity.this, MusicService.class)                        .putExtra("switch", 0xffffffff);                startService(in);            }        });        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {//判断是否安装sdcard            getAllMusic();        }    }    public void initView() {                              //获取所有控件实例        bt_sp = (Button) findViewById(R.id.sp);        bt_next = (Button) findViewById(R.id.next);        bt_qt = (Button) findViewById(R.id.quiet);        tv_crt = (TextView) findViewById(R.id.current);        tv_tol = (TextView) findViewById(R.id.total);        seekBar = (SeekBar) findViewById(R.id.seekBar);    }    public void getAllMusic() {        list = new ArrayList<>();        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/music";        Log.e("path", path);        File dir = new File(path);              //获取/mnt/media_rw/sdcard/music目录对象        File[] files = dir.listFiles();        getFilesName(files);    }    private void getFilesName(File[] files) {        if (files != null) {                                // 先判断该目录是否为空            for (File file : files) {                if (file.isDirectory()) {                    getFilesName(file.listFiles());         //递归                } else {                    String fileName = file.getName();                    list.add(fileName);                    Log.e("name", fileName);                }            }        }    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.sp: {                count++;                if (count % 2 == 0)                    bt_sp.setText("播放");                else                    bt_sp.setText("暂停");                Intent in = new Intent(this, MusicService.class)                        .putExtra("switch", 0xffffffff);                startService(in);            }            break;            case R.id.next: {                count = 0;                bt_sp.setText("播放");                Intent in = new Intent(this, MusicService.class)                        .putExtra("switch", 0xfffffffe);                startService(in);            }            break;            case R.id.quiet:                stopService(new Intent(this, MusicService.class));                finish();                break;        }    }    public static Handler handler = new Handler() {  //更新进度条和音乐播放时间                                     @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if (msg.obj != null) {                String total = (String) msg.obj;                tv_tol.setText(total);            }            int progress = msg.what;            int current = (int) (progress * MusicService.mp.getDuration() / 1000.0);            seekBar.setProgress(progress);            tv_crt.setText(new SimpleDateFormat("mm:ss").format(current));        }    };}

MusicService.java

package com.example.musicplayer;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.Environment;import android.os.IBinder;import android.os.Message;import android.util.Log;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.ArrayList;public class MusicService extends Service {    static MediaPlayer mp;    private ArrayList list;    private int flag = 1;    private static final String SDCARD = Environment.getExternalStorageDirectory().getAbsolutePath() + "/music/"; // sdcard路径/mnt/media_rw/sdcard/music    @Override    public void onCreate() {        super.onCreate();        Log.e("service", "服务被启动");        mp = new MediaPlayer();        list = MainActivity.list;          //获取所有音乐名        try {            mp.setDataSource(SDCARD + list.get(0));         //设置第一首歌            mp.prepare();             //装载音乐文件资源        } catch (IOException e) {            e.printStackTrace();        }    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        try {            int num = intent.getIntExtra("switch", 0);            if (num == 0xffffffff) {                               //按下播放按钮                if (MainActivity.count % 2 == 0) {                    mp.pause();                } else {                    mp.start();                    updateProgress();                }            } else if (num == 0xfffffffe) {                        //按下下一首按钮                if (flag > 0 && flag <= list.size() - 1) {                    if (mp != null) {                        if (mp.isPlaying()) {                            mp.stop();                        }                        mp.reset();                                     //重置                        mp.setDataSource(SDCARD + list.get(flag));                        mp.prepare();                              //装载音乐文件资源                    }                } else {                    flag = 0;                    if (mp != null) {                        if (mp.isPlaying()) {                            mp.stop();                        }                        mp.reset();                                     //重置                        mp.setDataSource(SDCARD + list.get(flag));                        mp.prepare();                              //装载音乐文件资源                    }                }                flag++;            }        } catch (IOException e) {            e.printStackTrace();        }        return super.onStartCommand(intent, flags, startId);    }    public void updateProgress() {                                   //更新进度条        new Thread(new Runnable() {            @Override            public void run() {                Message msg = Message.obtain();                msg.obj = getTime();                MainActivity.handler.sendMessage(msg);                while (MainActivity.count % 2 != 0) {                    Message msg_ = Message.obtain();                    int progress = (int) (mp.getCurrentPosition() * 1000.0 / mp.getDuration());                    msg_.what = progress;                 //获取当前播放位置                    MainActivity.handler.sendMessage(msg_);                    SystemClock.sleep(1000);    //延时一秒钟                                 }            }        }).start();        Log.e("thread", "更新线程结束");    }    public String getTime() {                        //将毫秒转换成时间        int total = mp.getDuration();        String format = "mm:ss";                     //自定义时间模式        SimpleDateFormat df = new SimpleDateFormat(format);        return df.format(total);    }    @Override    public void onDestroy() {        super.onDestroy();        if (mp != null) {            if (mp.isPlaying()) {                mp.stop();                mp.release();          //释放音乐文件资源            } else                mp.release();        }        Log.e("service", "服务被销毁");    }    @Override    public IBinder onBind(Intent intent) {        return null;    }}

加上用户权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

效果如下：

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