【发布时间】：2019-04-09 18:39:57
【问题描述】：
MyAdapter:
public class voice_player_listview_adapter extends ArrayAdapter<String> {
public ArrayList<String> Duration=null;
public ArrayList<String> voice_id=null;
private Activity context;
public voice_player_listview_adapter(Activity context,ArrayList<String> voice_id,ArrayList<String> Duration) {
super(context, R.layout.voice_player_listview,sender);
// TODO Auto-generated constructor stub
this.context=context;
this.voice_id=voice_id;
this.Duration=Duration;
}
public View getView(final int position, final View convertView, ViewGroup parent) {
View rowView=convertView;
final viewHolder holder; //viewHolder already created in some where
if (rowView==null)
{
LayoutInflater inflater = context.getLayoutInflater();
rowView = inflater.inflate(R.layout.voice_player_listview, parent, false);
holder= new viewHolder();
holder.icon=(ImageView) rowView.findViewById(R.id.download_play_icon);
holder.voice_duration=(TextView) rowView.findViewById(R.id.voiceDuration);
holder.voice_player_seekbar=(SeekBar) rowView.findViewById(R.id.voice_player_seekbar);
rowView.setTag(holder);
}
else
{
holder= (viewHolder) convertView.getTag();
}
holder.voice_duration.setText("00:"+this.Duration.get(position));
holder.icon.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new voicePlayer(voice_id.get(position),holder);
}
});
...
VoicePlayer:
class voicePlayer {
MediaPlayer mediaPlayer;
SeekBar seekbar;
TextView voice_duration;
ImageView icon;
viewHolder rowView;
final Handler handler = new Handler();
public void getViews()
{
this.seekbar=rowView.voice_player_seekbar;
this.voice_duration=rowView.voice_duration;
this.icon=rowView.icon;
}
public voicePlayer(String voice_id,WavesAPI.viewHolder holder) {
this.rowView=holder;
getViews();
try {
mediaPlayer=new MediaPlayer();
FileInputStream fis = new FileInputStream(Environment.getExternalStorageDirectory()...);
mediaPlayer.setDataSource(fis.getFD());
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.prepare();
mediaPlayer.start();
this.icon.setImageResource(R.drawable.pause);
this.updateSeekbar();
this.seekbar_listener();
} catch (IOException e) {
}
} catch (IOException e) {
}
}
}
private void updateSeekbar()
{
final Runnable runnable = new Runnable() {
public void run() {
int position= // calculating the position of the mediaPlayer for updating the seekbar
seekbar.setProgress(position);
handler.postDelayed(this, 50);
voice_duration.setText("00:"+((WavesAPI.player_data.mediaPlayer.getDuration()/1000)-(WavesAPI.player_data.mediaPlayer.getCurrentPosition()/1000)));
}
};
handler.post(runnable);
}
public void seekbar_listener()
{
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (fromUser)
{
int player_position=// calc new postion of the mediaPlayer
mediaPlayer.seekTo(player_position);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
}
问题： 当我单击列表视图行上的播放icon 时，只要我不滚动，就会播放音乐并且搜索栏会正确更新。但是，由于屏幕/列表视图只适合 3 个项目，当我向下滚动时，每 4 行，我看到新行搜索栏正在更新，与我播放和滚动的旧行的进度相同。我认为convertView 会生成与创建并传递给voicePlayer 相同的旧实例视图。一旦我不考虑convertView 并且对于每个getView 我通过inflater.inflate 创建新的rowView，重复实例问题就解决了，但是当我滚动一个项目并重新滚动回该项目时，更新被停止。
【问题讨论】：
-
知道如何解决这个问题吗？
-
有人帮我解决它
标签： android android-studio listview android-listview