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