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我在列表視圖中有按鈕和進度條（不可見）。當按鈕單擊它應該消失，進度條應該是可見的並開始運行（從網絡服務器下載），當它完成與運行按鈕應該再次出現。現在，當我點擊第一個項目的按鈕時，進度條會運行，但如果我向下滾動，直到第一個項目熄滅屏幕，我會看到進度條與第一個項目的進度條同時運行在最後一項listview上。如果我向上滾動第一個項目的進度條正常運行。如果我點擊第二項，listview的倒數第二項也是一樣的。什麼是問題，我怎麼解決它？請幫忙！！！當listview向下滾動時，新的listview項會複製第一個listview項的動作嗎？
這裏是我的自定義列表視圖適配器異步任務
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;
}
請告訴我應該在哪裏設置我的觀點狀態。我如何避免重複使用？ – casper 2013-05-13 22:53:32
問題僅在使用asynctask的下載過程中發生。一切工作正常，除非在下載時向下滾動，我看到重複。 – casper 2013-05-13 23:24:56
我將所有ViewHolder都帶走了，而且我仍然看到同樣的問題 – casper 2013-05-13 23:52:24