我在列表视图中有按钮和进度条（不可见）。当按钮单击它应该消失并且进度条应该可见并开始运行（从网络服务器下载），当它完成时运行按钮应该再次出现。现在，当我单击第一项的按钮时，进度条会运行，但是如果我向下滚动直到第一项离开屏幕，我会看到进度条与列表视图的最后一项上的第一项的进度条同时运行。如果我向上滚动第一项的进度条运行正常。如果我单击第二个项目，列表视图的倒数第二个项目也会发生同样的情况。有什么问题，我该如何解决？请帮忙！！！
这是我的带有异步任务的自定义列表视图适配器
public static class ViewHolder
{
public ImageView imgViewFlag;
public TextView txtViewTitle,txtProgress;
public Button imgAR,imgPDF,imgDown,btnDel;
public TextProgressBar progress;
public ConnectionDetector cd=new ConnectionDetector(activity);
public Database db=new Database(activity);
int position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ArrayList<String> array=JournalArray.get(position);
final ViewHolder view;
LayoutInflater inflator = activity.getLayoutInflater();
if(convertView==null)
{
view = new ViewHolder();
convertView = inflator.inflate(R.layout.familylist_item, null);
view.progress=(TextProgressBar)convertView.findViewById(R.id.downprogress);
view.progress.setTextColor(Color.BLACK);
view.txtViewTitle = (TextView) convertView.findViewById(R.id.text);
//view.txtProgress=(TextView)convertView.findViewById(R.id.textProgress);
view.imgViewFlag = (ImageView) convertView.findViewById(R.id.imageView1);
view.imgAR=(Button)convertView.findViewById(R.id.imageAR);
view.imgAR.setTag(view);
view.imgDown=(Button)convertView.findViewById(R.id.imageDown);
view.imgDown.setTag(view);
view.imgPDF=(Button)convertView.findViewById(R.id.imagePDF);
view.imgPDF.setTag(view);
//view.progress=(ProgressBar)convertView.findViewById(R.id.downprogress);
view.btnDel=(Button)convertView.findViewById(R.id.btnDel);
view.btnDel.setTag(view);
convertView.setTag(view);
}
else
{
view = (ViewHolder) convertView.getTag();
}
if(!isLoading){
if(DeleteBin){
if(XMLParser.CheckFileInSD(array.get(5))){
view.btnDel.setVisibility(View.VISIBLE);
view.imgAR.setVisibility(View.GONE);
view.imgDown.setVisibility(View.GONE);
view.imgPDF.setVisibility(View.GONE);
view.progress.setVisibility(View.GONE);
}
else{
view.imgDown.setVisibility(View.GONE);
view.imgAR.setVisibility(View.GONE);
view.btnDel.setVisibility(View.GONE);
view.imgPDF.setVisibility(View.GONE);
view.progress.setVisibility(View.GONE);
}
}
else{
view.btnDel.setVisibility(View.GONE);
if(!XMLParser.CheckFileInSD(array.get(5))){
view.imgAR.setVisibility(View.GONE);
view.imgPDF.setVisibility(View.GONE);
view.imgDown.setVisibility(View.VISIBLE);
view.progress.setVisibility(View.GONE);
}
else{
view.imgAR.setVisibility(View.VISIBLE);
view.imgPDF.setVisibility(View.VISIBLE);
view.imgDown.setVisibility(View.GONE);
view.progress.setVisibility(View.GONE);
}
}
}
view.txtViewTitle.setText(array.get(1));
channelid=array.get(4);
RelativeLayout.LayoutParams paramrel = new RelativeLayout.LayoutParams(width/5, height/5);
paramrel.leftMargin = width/10;
view.imgViewFlag.setLayoutParams(paramrel);
view.imgViewFlag.setImageDrawable(Drawable.createFromPath(new File(array.get(3)).getAbsolutePath()));
view.imgDown.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(downloading<1){
downloading++;
path=array.get(5);
channelid=array.get(4);
pos=position;
view.progress.setMax(100);
view.progress.setProgress(0);
view.progress.setVisibility(View.VISIBLE);
view.imgDown.setVisibility(View.GONE);
view.progress.setText("Татаж байна...");
new AsyncTask<ViewHolder, String, String>() {
private ViewHolder v;
@Override
protected String doInBackground(ViewHolder... params) {
v = params[0];
int count;
isLoading=true;
//mprogress=progress;
String result="0";
if(view.cd.isConnectingToInternet()){
getChannel(channelid);
try {
URL url = new URL(path);
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(url.openStream(), 8192);
String PATH="/mnt/sdcard/sdcard/.FamilyMagazine";
File dir=new File(PATH);
boolean test=dir.mkdirs();
OutputStream output = new FileOutputStream("/mnt/sdcard/sdcard/.FamilyMagazine/"+XMLParser.getFileName(path));
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress(""+(int)((total*100)/lenghtOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
result=e.toString();
}
}
else
result="Интернетэд холбогдоогүй байна!";
return result;
}
protected void onProgressUpdate(String... progress) {
// setting progress percentage
view.progress.setProgress(Integer.parseInt(progress[0]));
int x=lenghtOfFile/100 * Integer.parseInt(progress[0])/1048576;
view.progress.setText(x+"MB / "+lenghtOfFile/1048576+"MB");
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
//view.txtProgress.setVisibility(View.GONE);
downloading--;
// if (v.position == pos) {
isLoading=false;
if(result.equals("0")){
view.imgDown.setVisibility(View.GONE);
view.progress.setVisibility(View.GONE);
view.btnDel.setVisibility(View.GONE);
view.imgAR.setVisibility(View.VISIBLE);
view.imgPDF.setVisibility(View.VISIBLE);
}
else
{
Toast.makeText(activity, result, Toast.LENGTH_LONG).show();
view.imgDown.setVisibility(View.VISIBLE);
view.btnDel.setVisibility(View.GONE);
view.imgAR.setVisibility(View.GONE);
view.imgPDF.setVisibility(View.GONE);
}
}
//}
}.execute(view);
}
}
});
return convertView;
}