android 简单的音乐播放器实现播放模式的切换

以前写过一篇简单的音乐播放器，但是这个播放器没有实现播放模式的切换，在项目中要实现两个播放模式，循环播放和随机播放，经过这两天的努力搞定了，界面比较粗糙。可以先看一下前面的简单音乐播放器，详细的就不说了，直接把代码放上去，详细的看前面的博文。

布局文件

实现的activity

package cn.edu.cqu.project_test_activity;
import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;import com.zghaikun.sleep_client.R;import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
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 MP3ListActivity extends Activity 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> musicList;private ArrayList 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;@Overrideprotected void onCreate(Bundle savedInstanceState) {this.requestWindowFeature(Window.FEATURE_NO_TITLE);super.onCreate(savedInstanceState);setContentView(R.layout.mp3_list);  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>(); musicpathlist=new ArrayList();mediaPlayer = new MediaPlayer();//获得视频列表,默认显示放松音乐mp3List(music);fristButton.setOnClickListener(new OnClickListener() {@Overridepublic 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() {@Overridepublic 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() {@Overridepublic boolean onTouch(View arg0, MotionEvent arg1) {// TODO Auto-generated method stubif(arg1.getAction() == MotionEvent.ACTION_DOWN){  arg0.setBackgroundResource(R.drawable.xiayishou_anxia);  }  else if(arg1.getAction() == MotionEvent.ACTION_UP){  arg0.setBackgroundResource(R.drawable.xiayishou);  } return false;}});backButton.setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View view, MotionEvent event) {// TODO Auto-generated method stubif(event.getAction() == MotionEvent.ACTION_DOWN){  view.setBackgroundResource(R.drawable.shangyishou_anxia);  }  else if(event.getAction() == MotionEvent.ACTION_UP){  view.setBackgroundResource(R.drawable.shangyishou);  } 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(){@Overridepublic 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 map = new HashMap();  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 blocke.printStackTrace();}}}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.pause:pauseButton.setBackgroundResource(R.drawable.jixu);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falgflag = 1;modelButton.setBackgroundResource(R.drawable.suiji);}else{Toast.makeText(getApplicationContext(), "循环播放", Toast.LENGTH_SHORT).show();//循环播放flag = 0;modelButton.setBackgroundResource(R.drawable.xunhuan);}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();pauseButton.setBackgroundResource(R.drawable.zanting);mediaPlayer.pause();   }else  mediaPlayer.start();   }   public void stop() {   if (mediaPlayer.isPlaying()) {   mediaPlayer.stop();   }   } @Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();if (mediaPlayer != null) {mediaPlayer.stop();//mediaPlayer.release();}}
}

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