Android音乐播放器开发

今日看书，看到这个播放器，我就写了个例子，感觉还行，这个播放器能播放后缀是。MP3的音乐，这个例子在main.xml设置listView的时候，注意：android:id="@+id/android:list"的设置，否则程序会报错，说找不到listview。这个效果还是不错的。可以当做是简单的音乐播放器，可以读取sdcard里面后缀是。MP3的歌曲。有问题可以留言，想要源码可以留言，这个代码比较简单。转载请标明出处：

http://blog.csdn.net/wdaming1986/article/details/6768884

csdn资源下载链接地址：http://download.csdn.net/detail/wdaming1986/3611735

看程序效果图：可以点击每首歌播放，

也可以用下面的按钮：修改后的程序加了滚动条了

代码说明一切：

一、MainActivity。java类中的代码：

package com.cn.daming;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.GradientDrawable.Orientation;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends ListActivity {

    private ImageButton mFrontImageButton = null;
    private ImageButton mStopImageButton = null;
    private ImageButton mStartImageButton = null;
    private ImageButton mPauseImageButton = null;
    private ImageButton mNextImageButton = null;

    /*定义进度handler，显示百分比进度*/
    Handler mPercentHandler = new Handler();

    private SeekBar     mSeekBar=null;
    private TextView curProgressText=null;
    private TextView curtimeAndTotaltime=null;


    public MediaPlayer mMediaPlayer;
    private List<String> mMusicList = new ArrayList<String>();
    private int currentListItem = 0;

    private static final String MUSIC_PATH = new String("/sdcard/");

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        drawBackground();
        setContentView(R.layout.main);
        musicList();
        mMediaPlayer = new MediaPlayer();
        initmFrontMusic();
        initStopMusic();
        initStartMusic();
        initPauseMusic();
        initNextMusic();
        initSeekBar();
    }

     public void drawBackground()
         {
             GradientDrawable grad = new GradientDrawable(
                        Orientation.TL_BR,
                        new int[] {
                                       Color.rgb(0, 0, 127),
                                       Color.rgb(0, 0, 255),
                                       Color.rgb(127, 0, 255),
                                       Color.rgb(127, 127, 255),
                                       Color.rgb(127, 255, 255),
                                       Color.rgb(255, 255, 255)
                                   }
             );

             this.getWindow().setBackgroundDrawable(grad);
         }


    public void initmFrontMusic()
    {
        mFrontImageButton = (ImageButton)findViewById(R.id.front_button);
        mFrontImageButton.setOnClickListener(new OnClickListener(){

            public void onClick(View arg0) {
                if(--currentListItem >= 0){
                    currentListItem = mMusicList.size();
                }else{
                    playMusic(MUSIC_PATH + mMusicList.get(currentListItem));
                }
            }
        });
    }

    public void initStopMusic()
    {
        mStopImageButton = (ImageButton)findViewById(R.id.stop_button);
        mStopImageButton.setOnClickListener(new OnClickListener(){

            public void onClick(View arg0) {
                if(mMediaPlayer.isPlaying())
                {
                    mMediaPlayer.reset();
                }
            }
        });
    }

    public void initStartMusic()
    {
        mStartImageButton = (ImageButton)findViewById(R.id.start_button);
        mStartImageButton.setOnClickListener(new OnClickListener(){

            public void onClick(View arg0) {
                playMusic(MUSIC_PATH + mMusicList.get(currentListItem));
                startSeekBarUpdate();
            }
        });
    }

    public void initPauseMusic()
    {
        mPauseImageButton = (ImageButton)findViewById(R.id.pause_button);
        mPauseImageButton.setOnClickListener(new OnClickListener(){

            public void onClick(View arg0) {
                if(mMediaPlayer.isPlaying()){
                    mMediaPlayer.pause();
                }
                else{
                    mMediaPlayer.start();
                }
            }
        });
    }

    public void initNextMusic()
    {
        mNextImageButton = (ImageButton)findViewById(R.id.next_button);
        mNextImageButton.setOnClickListener(new OnClickListener(){

            public void onClick(View arg0) {
                nextMusic();
            }
        });
    }

    public void initSeekBar()
    {
        /*初始化拖动条和当前进度显示值*/
        mSeekBar=(SeekBar)findViewById(R.id.SeekBar01);
        curProgressText=(TextView)findViewById(R.id.currentProgress);
        curtimeAndTotaltime=(TextView)findViewById(R.id.curtimeandtotaltime);

        mSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                /* 如果拖动进度发生改变，则显示当前进度值 */
                curProgressText.setText("当前进度: " + progress);
            }

            public void onStartTrackingTouch(SeekBar arg0) {
                curProgressText.setText("拖动中...");
            }

            public void onStopTrackingTouch(SeekBar arg0) {
                int dest = mSeekBar.getProgress();
                int mMax = mMediaPlayer.getDuration();
                int sMax = mSeekBar.getMax();

                mMediaPlayer.seekTo(mMax*dest/sMax);

            }
        });
    }

    private void playMusic(String path)
    {
        try {
            mMediaPlayer.reset();
            mMediaPlayer.setDataSource(path);
            mMediaPlayer.prepare();
            mMediaPlayer.start();
            mMediaPlayer.setOnCompletionListener(new OnCompletionListener(){

                public void onCompletion(MediaPlayer arg0) {
                    nextMusic();
                }
            });
         }catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void nextMusic()
    {
        if(++currentListItem >= mMusicList.size())
        {
            currentListItem = 0;
        }
        else
        {
            playMusic(MUSIC_PATH + mMusicList.get(currentListItem));
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK){
            mMediaPlayer.stop();
            mMediaPlayer.release();
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        currentListItem = position;
        playMusic(MUSIC_PATH + mMusicList.get(position));
        super.onListItemClick(l, v, position, id);
    }

    //播放列表
    public void musicList()
    {
        File home = new File(MUSIC_PATH);
        if(home.listFiles(new MusicFilter()).length > 0)
        {
            for(File file : home.listFiles(new MusicFilter()))
            {
                mMusicList.add(file.getName());
            }
            ArrayAdapter<String> musicList = new ArrayAdapter<String>(MainActivity.this,R.layout.musicitem,mMusicList);
            setListAdapter(musicList);
        }
    }

    /*更新拖动条进度*/

    public void startSeekBarUpdate() {
        mPercentHandler.post(start);
    }

    Runnable start = new Runnable() {

        public void run() {
            // 用一个handler更新SeekBar
            mPercentHandler.post(updatesb);
        }

    };

    Runnable updatesb =new Runnable(){

    public void run() {
            int position = mMediaPlayer.getCurrentPosition();
            int mMax = mMediaPlayer.getDuration();
            int sMax = mSeekBar.getMax();
            mSeekBar.setProgress(position * sMax / mMax);
            curtimeAndTotaltime.setText("当前播放时间： " + position / 1000 + "秒"
                    + "
歌曲总时间: " + mMax / 1000 + "秒");
            // 每秒钟更新一次
            mPercentHandler.postDelayed(updatesb, 1000);
    }

    };


    //过滤文件类型
    class MusicFilter implements FilenameFilter
    {

        public boolean accept(File dir, String name) {
            //这里还可以设置其他格式的音乐文件
            return (name.endsWith(".mp3"));
        }
    }
}

二、main。xml布局文件的代码：

<span style="font-size: 13px; color: #000000;"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="25dip"
        android:paddingTop="5dip"
        android:layout_gravity="center_horizontal"
        android:gravity="center_horizontal"
        android:textColor="#FF000000"
        android:text="大明制作Mp3播放器"
    />
     <ListView
        android:id="@+id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="200dip"
        android:layout_weight="1"
        android:drawSelectorOnTop="false"
     />

     <SeekBar
        android:id="@+id/SeekBar01"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:max="100"
        android:progress="0"
        android:secondaryProgress="0"
        android:visibility="visible"
       />

    <TextView
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:id="@+id/currentProgress"
    />

   <TextView
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:layout_y="300dp"
        android:id="@+id/curtimeandtotaltime"
    />


     <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
      >
          <ImageButton
               android:id="@+id/front_button"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:background="@drawable/first1"
               android:layout_marginLeft="10dip"
          />
          <ImageButton
               android:id="@+id/stop_button"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:background="@drawable/stop1"
               android:layout_marginLeft="10dip"
          />
          <ImageButton
               android:id="@+id/start_button"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:background="@drawable/start1"
               android:layout_marginLeft="10dip"
          />
          <ImageButton
               android:id="@+id/pause_button"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:background="@drawable/pose1"
               android:layout_marginLeft="10dip"
          />
          <ImageButton
               android:id="@+id/next_button"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:background="@drawable/next1"
               android:layout_marginLeft="10dip"
          />
      </LinearLayout>
</LinearLayout>
</span>

三、musicitem.xml布局文件的代码：

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/TextView01"
    android:layout_width="fill_parent"
    android:layout_height="26dip"
    android:layout_gravity="center_vertical"
    android:paddingTop="5dip"
    android:paddingLeft="20dip"
    android:textColor="#FF000000"
    android:text="@string/hello1"/>

四、Manifest。xml文件

<span style="font-size: 13px; color: #000000;"><?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.cn.daming"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest></span>