Android音乐播放器【安卓进化二十】

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));}}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {        if(keyCode == KeyEvent.KEYCODE_BACK){        mMediaPlayer.stop();        mMediaPlayer.release();        }return super.onKeyDown(keyCode, event);}@Overrideprotected 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SeekBarmPercentHandler.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"+ "\n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：

<?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>

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

<?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>

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