简单音乐播放器

来源：互联网发布：linux上安装oracle 编辑：程序博客网时间：2024/06/11 11:26

很简单的音乐播放器哦，网上的播放器东西有点多，自己做了一个简单的。
实现了扫描SD卡上的歌曲，声音控制，进度条控制，自动播放下一首，以及后台播放。因为时间仓促，界面美观，多包涵。

这里写图片描述
效果图

下面是代码
Java代码

package com.phone1000.days24service03mediapalylist;import java.io.File;import java.io.FilenameFilter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.ListActivity;import android.content.Intent;import android.database.Cursor;import android.media.AudioManager;import android.os.Bundle;import android.provider.MediaStore;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.Toast;public class MainActivity extends ListActivity {//  传地址给PlyerService    public static Map<Integer, String> map = new HashMap<Integer, String>();    // 四个按钮    private Button playButton = null, mFrontButton = null, mLastButton = null,            exitButton = null;    // 播放进度seekbar    public static SeekBar audioSeekBar = null;    // 控制声音的seekbar    private SeekBar audioVolumn = null;    // 声音管理器    private AudioManager mAudioManager = null;    // 播放列表    public static List<String> mMusicList = new ArrayList<String>();    // 设置播放当前的选项条目    public static int currentListItem = 0;    Cursor mAudioCursor;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        getMusicList();        initView();    }    /**     * 给ListActivity中的ListView添加所有的以mp3结尾的音乐文件     */    private void getMusicList() {        // 清空list        mMusicList.clear();        mAudioCursor = this.getContentResolver().query(                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null,// 字段　没有字段　就是查询所有信息　相当于SQL语句中的　“ * ”                                                              null, // 查询条件                null, // 条件的对应?的参数                MediaStore.Audio.AudioColumns.TITLE);// 排序方式        // 循环输出歌曲的信息        mMusicList = new ArrayList<String>();        for (int i = 0; i < mAudioCursor.getCount(); i++) {            mAudioCursor.moveToNext();            // 找到歌曲标题和总时间对应的列索引            int indexTitle = mAudioCursor                    .getColumnIndex(MediaStore.Audio.AudioColumns.TITLE);            int indexARTIST = mAudioCursor                    .getColumnIndex(MediaStore.Audio.AudioColumns.ARTIST);            int indexALBUM = mAudioCursor                    .getColumnIndex(MediaStore.Audio.AudioColumns.ALBUM);            int indexData = mAudioCursor                    .getColumnIndex(MediaStore.Audio.AudioColumns.DATA);            String strTitle = mAudioCursor.getString(indexTitle);            String strARTIST = mAudioCursor.getString(indexARTIST);            String strALBUM = mAudioCursor.getString(indexALBUM);            String strData = mAudioCursor.getString(indexData);            map.put(i,strData);            mMusicList.add(strTitle + "---" + strARTIST + "---" + strALBUM);            // 构建Adapter，将mMusicList的数据添加到Adapter内            ArrayAdapter<String> musicAdapter = new ArrayAdapter<String>(                    MainActivity.this, android.R.layout.simple_list_item_1,                    mMusicList);            // 设置当前ListActivity中id为android：list的适配器为musicAdapter            setListAdapter(musicAdapter);        }    }    // 内部工具类，过滤所有以mp3结尾的文件    class MusicFilter implements FilenameFilter {        @Override        public boolean accept(File dir, String filename) {            return filename.endsWith(".mp3");        }    }    private void initView() {        mFrontButton = (Button) findViewById(R.id.button3);        playButton = (Button) findViewById(R.id.button2);        mLastButton = (Button) findViewById(R.id.button1);        exitButton = (Button) findViewById(R.id.button4);        audioVolumn = (SeekBar) findViewById(R.id.seekBar2);        audioSeekBar = (SeekBar) findViewById(R.id.seekBar1);        playButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                playMusic(AppConstant.PAUSE);            }        });        mFrontButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                nextMusic();            }        });        mLastButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                frontMusic();            }        });        exitButton.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this,                        PlayerService.class);                stopService(intent);                finish();            }        });        // 给播放进度添加监听        audioSeekBar.setOnSeekBarChangeListener(new SeekBarChangeEvent());        if (PlayerService.mMediaPlayer != null) {            // 设置进度的最大值            audioSeekBar.setMax(PlayerService.mMediaPlayer.getDuration());            audioSeekBar.setProgress(PlayerService.mMediaPlayer                    .getCurrentPosition());        }        mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);        audioVolumn.setProgress(mAudioManager                .getStreamVolume(AudioManager.STREAM_MUSIC));        audioVolumn.setOnSeekBarChangeListener(new AudioVolumnChangeEvent());    }    class AudioVolumnChangeEvent implements OnSeekBarChangeListener {        @Override        public void onProgressChanged(SeekBar seekBar, int progress,                boolean fromUser) {            mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress,                    0);        }        @Override        public void onStartTrackingTouch(SeekBar seekBar) {        }        @Override        public void onStopTrackingTouch(SeekBar seekBar) {        }    }    class SeekBarChangeEvent implements OnSeekBarChangeListener {        @Override        public void onProgressChanged(SeekBar seekBar, int progress,                boolean fromUser) {            // 如果用户手动拖动seekbar的时候            if (fromUser) {                PlayerService.mMediaPlayer.seekTo(progress);            }        }        @Override        public void onStartTrackingTouch(SeekBar seekBar) {            // 开始拖动进度条的时候，音乐暂停            PlayerService.mMediaPlayer.pause();        }        @Override        public void onStopTrackingTouch(SeekBar seekBar) {            // 停止拖動進度條的時候，音樂開始播放            PlayerService.mMediaPlayer.start();        }    }    protected void frontMusic() {        if (--currentListItem >= 0) {            playMusic(AppConstant.PLAY);        } else {            Toast.makeText(this, "已经是第一首歌曲了", Toast.LENGTH_LONG).show();            currentListItem = 0;        }    }    protected void nextMusic() {        if (++currentListItem >= mMusicList.size()) {            Toast.makeText(this, "已经是最后一首歌曲了", Toast.LENGTH_LONG).show();            currentListItem = mMusicList.size() - 1;        } else {            playMusic(AppConstant.PLAY);        }    }    private void playMusic(int pauseOrPlay) {        Intent intent = new Intent(this, PlayerService.class);        intent.putExtra("MSG", pauseOrPlay);        startService(intent);    }    /**     * 用户点击了ListActivity中的ListView的时候的操作     *      * @param l     *            listView控件本身     * @param v     *            TextView用户点击的某一条目所对应的TextView     * @param position     *            位置     * @param id     *            id     */    @Override    protected void onListItemClick(ListView l, View v, int position, long id) {        currentListItem = position;        playMusic(AppConstant.PLAY);        super.onListItemClick(l, v, position, id);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

PlayerService :

package com.phone1000.days24service03mediapalylist;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.IBinder;import android.widget.Toast;public class PlayerService extends Service implements OnCompletionListener,        Runnable {    public static MediaPlayer mMediaPlayer = null;    // 设置是否单曲循环    private static boolean isLoop = false;    // 用户的操作    private int MSG;    @Override    public void onCreate() {        if (mMediaPlayer != null) {            mMediaPlayer.reset();            mMediaPlayer.release();            mMediaPlayer = null;        }        mMediaPlayer = new MediaPlayer();        mMediaPlayer.setOnCompletionListener(this);        super.onCreate();    }    private void playMusic() {        try {            mMediaPlayer.reset();            mMediaPlayer.setDataSource(MainActivity.map                    .get(MainActivity.currentListItem));            mMediaPlayer.prepare();            mMediaPlayer.start();            mMediaPlayer.setLooping(isLoop);            MainActivity.audioSeekBar.setMax(PlayerService.mMediaPlayer                    .getDuration());            new Thread(this).start();        } catch (Exception e) {            e.printStackTrace();        }    }    @Override    public void run() {        int currentPostion = 0;        // 获得媒体的播放持续时间        int toal = mMediaPlayer.getDuration();        while (mMediaPlayer != null && currentPostion < toal) {            try {                Thread.sleep(1000);                if (mMediaPlayer != null) {                    // 获得媒体的当前播放位置                    currentPostion = mMediaPlayer.getCurrentPosition();                }            } catch (InterruptedException e) {                e.printStackTrace();            }            // 设置MainActivity中audioSeekBar控件的当前进度为currentPostion            MainActivity.audioSeekBar.setProgress(currentPostion);        }    }    /**     * 播放完当前歌曲，自动播放下一首     */    @Override    public void onCompletion(MediaPlayer mp) {        if (++MainActivity.currentListItem >= MainActivity.mMusicList.size()) {            Toast.makeText(this, "已经到最后一首了", Toast.LENGTH_LONG).show();            MainActivity.currentListItem--;            MainActivity.audioSeekBar.setMax(0);        } else {            playMusic();        }    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        MSG = intent.getIntExtra("MSG", AppConstant.PLAY);        switch (MSG) {        case AppConstant.PLAY:            playMusic();            break;        case AppConstant.PAUSE:            if (mMediaPlayer.isPlaying()) {                mMediaPlayer.pause();            } else {                mMediaPlayer.start();            }            break;        default:            break;        }        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onDestroy() {        if (mMediaPlayer != null) {            mMediaPlayer.stop();            mMediaPlayer.release();            mMediaPlayer = null;        }        super.onDestroy();    }    @Override    public IBinder onBind(Intent intent) {        // TODO Auto-generated method stub        return null;    }}

AppConstant

package com.phone1000.days24service03mediapalylist;public interface AppConstant {    int PLAY = 1;       //  播放    int PAUSE = 2;      //  暂停}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/LinearLayout1"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:background="@drawable/pic1"    tools:context=".MainActivity" >    <SeekBar        android:id="@+id/seekBar1"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <Button            android:id="@+id/button1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="pre" />        <Button            android:id="@+id/button2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="pau" />        <Button            android:id="@+id/button3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="nex" />        <Button            android:id="@+id/button4"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="exi" />    </LinearLayout>    <SeekBar        android:id="@+id/seekBar2"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <Button        android:id="@+id/button5"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="Play list" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >        <ListView            android:id="@+id/android:list"            android:layout_width="match_parent"            android:layout_height="wrap_content" >        </ListView>    </LinearLayout></LinearLayout>

最后别忘记加权限了：

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

[源代码下载](http://download.csdn.net/detail/qq_29089575/9172387)今天发现了一个错误，没播放音乐时拖动进度条会报错。

解决办法是給监听事件设置条件。如果进度条不是0的时候给它注册监听。

if(PlayerService.currentPostion==0){            }else{audioSeekBar.setOnSeekBarChangeListener(new SeekBarChangeEvent());        }

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