listview+seekbar问题的解决

最近做了个项目，其中有录音播放功能。每次录音结束都会在listView中显示，在listView中能播放每次的录音，也可以每条录音之间的切换播放。随之就引发了许多的问题，比如当我播放第一条录音的时所有的Seekbar都跟着动。我在listView用一个按钮控制播放与暂停，当第一次点击按钮时按钮的背景图片更换播放录音，第二次点击按钮时按钮的背景图片更换暂停录音。这又会引发其他的控件也会改变，一系列的问题。

解决问题的代码如下：

 package net.ijoysoft.notes.adapter;  

 import java.io.File;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.Timer;
 import java.util.TimerTask;  

 import net.ijoysoft.notes.ui.NoteEditActivity;
 import net.ijoysoft.notes.uti.Util;  

 import com.tools.enotes.R;  

 import android.content.Context;
 import android.media.MediaPlayer;
 import android.media.MediaPlayer.OnCompletionListener;
 import android.net.Uri;
 import android.os.Handler;
 import android.test.UiThreadTest;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.Button;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 import android.widget.TextView;  

 public class RecordListAdapter extends BaseAdapter {
     public int thisPosition = -1;
     public MediaPlayer mMediaPlayer = new MediaPlayer();
     public boolean isPlay = true;
     public boolean isFiring = false;
     public List<Integer> a = new ArrayList<Integer>();
     private Context context;
     private LayoutInflater inflater;
     private List<File> Mdata = null;  

     public RecordListAdapter(Context context, List<File> mdata) {
         super();
         this.context = context;
         Mdata = mdata;
         inflater = LayoutInflater.from(context);
     }  

     @Override
     public int getCount() {
         return Mdata == null ? 0 : Mdata.size();
     }  

     @Override
     public Object getItem(int position) {
         return Mdata.get(position);
     }  

     @Override
     public long getItemId(int position) {
         return position;
     }  

     private Timer timer;  

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         final RecordViewHold holder;
         final int sign = position;
         if (convertView == null) {
             convertView = inflater
                     .inflate(R.layout.data_record_list_item, null);
             holder = new RecordViewHold();
             holder.record_play = (Button) convertView
                     .findViewById(R.id.note_play);
             holder.record_seek = (SeekBar) convertView
                     .findViewById(R.id.note_seekBar);
             holder.record_time = (TextView) convertView
                     .findViewById(R.id.note_time);
             holder.record_delete = (Button) convertView
                     .findViewById(R.id.note_delete);
             holder.record_play.setTag(sign);
             convertView.setTag(holder);
         } else {
             holder = (RecordViewHold) convertView.getTag();
         }
         Uri uri = Uri.fromFile(Mdata.get(sign));
         MediaPlayer mMediaPlayer1 = MediaPlayer.create(context, uri);
         SimpleDateFormat format = new SimpleDateFormat("mm:ss");
         Date date = new Date(mMediaPlayer1.getDuration());
         String time = format.format(date);
         holder.record_time.setText(time);
         //控制控件背景图片的改变
         switch (thisPosition) {
         case -1:  

             break;
         default:
             if(thisPosition!= sign){
                 holder.record_play
                 .setBackgroundResource(R.drawable.data_play);
             }
             break;
         }  

         holder.record_play.setOnClickListener(new OnClickListener() {  

             @Override
             public void onClick(View v) {
                 thisPosition = sign;
                 int tag = (Integer) v.getTag();
                 Log.i("jjf", "tag的值" + tag);
                 Log.i("jjf", "sign的值" + sign);
                 //根据点击的item中的值判断是否是同一个按钮
                 if (a.size() != 0) {
                     if (a.get(0) != sign) {
                         mMediaPlayer.pause();
                         isPlay = true;
                         isFiring = false;
                         if (timer != null) {
                             timer.cancel();
                             timer = null;
                         }
                     }
                 }
                     if (isPlay) {// 播放录音
                         Uri uri = Uri.fromFile(Mdata.get(sign));
                         a.clear();
                         a.add(tag);
                         // 播放录音
                         mMediaPlayer = MediaPlayer.create(context, uri);
                         holder.record_seek.setMax(mMediaPlayer.getDuration());
                         SimpleDateFormat format = new SimpleDateFormat("mm:ss");
                         Date date = new Date(mMediaPlayer.getDuration());
                         String time = format.format(date);
                         holder.record_time.setText(time);
                         isFiring = true;
                         mMediaPlayer.start();
                         timer = new Timer();
                         final Handler handler = new Handler();
                         timer.schedule(new TimerTask() {
                             @Override
                             public void run() {
                                 handler.post(new Runnable() {
                                     @Override
                                     public void run() {
                                         if (isFiring) {
                                             holder.record_seek.setProgress(mMediaPlayer
                                                     .getCurrentPosition());
                                         }
                                     }
                                 });  

                             }
                         }, 100, 100);
                         mMediaPlayer
                                 .setOnCompletionListener(new OnCompletionListener() {  

                                     @Override
                                     public void onCompletion(MediaPlayer mp) {
                                         holder.record_play
                                                 .setBackgroundResource(R.drawable.data_play_default);
                                         isPlay = true;
                                         if (timer != null) {
                                             timer.cancel();
                                             timer = null;
                                         }
                                     }
                                 });  

                         holder.record_play
                                 .setBackgroundResource(R.drawable.start_play_default);
                         isPlay = false;
                     } else {
                         mMediaPlayer.pause();
                         holder.record_play
                                 .setBackgroundResource(R.drawable.data_play_default);
                         isPlay = true;
                         isFiring = false;
                         if (timer != null) {
                             timer.cancel();
                             timer = null;
                         }
                     }
                     //按钮点击发生变化重绘item
                     notifyDataSetChanged();
                 }
         });
         holder.record_seek
                 .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {  

                     @Override
                     public void onStopTrackingTouch(SeekBar arg0) {
                     }  

                     @Override
                     public void onStartTrackingTouch(SeekBar arg0) {
                     }  

                     @Override
                     public void onProgressChanged(SeekBar seekBar,
                             int progress, boolean fromUser) {
                         if (fromUser == true) {
                             // mMediaPlayer.seekTo(progress);
                             holder.record_seek.setProgress(progress);
                             holder.record_play
                                     .setBackgroundResource(R.drawable.data_play_default);
                         }
                     }
                 });
         holder.record_delete.setOnClickListener(new OnClickListener() {  

             @Override
             public void onClick(View v) {  

                 Log.i("jjf", "Mdata的值：" + Mdata.size());
                 Util.deleteFolder(Mdata.remove(sign));
                 Log.i("jjf", "Mdata的值：" + Mdata.size());
                     if (isFiring) {
                         mMediaPlayer.pause();
                 }
                 notifyDataSetChanged();
             }
         });  

         return convertView;
     }
     public void stopMedia(){
         if (mMediaPlayer.isPlaying()) {
             mMediaPlayer.pause();
         }
     }  

 }  

 class  RecordViewHold {
     Button record_play, record_delete;
     SeekBar record_seek;
     TextView record_time;
 }  

转自:http://blog.csdn.net/dylan_null/article/details/41257441