Android: Zmień obraz dla konkretnego elementu w widoku listy
Na powyższym obrazie znajduje się widok listy, który zawiera listę elementów, które użytkownik może pobrać. Jest to obraz, który informuje użytkownika, że może pobrać plik. Po zakończeniu pobierania obraz zmieni się na
. Mój problem polega na tym, że kiedy ściągam plik, obraz stanu (który oznacza, że pobieranie zostało zakończone) zostaje zmieniony na inny wiersz, zamiast tego powinien zmienić się dla wybranego przeze mnie wiersza. Obecnie, jeśli ściągnę pierwszy plik z listy, obraz zostanie zmieniony na 4. lub 5. pozycję na liście. Również, gdy próbuję pobrać dowolny inny plik z listy. otwiera ostatni pobrany plik (jest to funkcjonalność aplikacji, która, jeśli plik jest już pobrany, otwórz go w czytniku pdf), tj. jeśli ściągnę pierwszy plik z listy, a następnie przejdę do drugiego elementu, to zamiast pobierać drugi plik, otwiera ostatni pobrany plik. Co więcej, jeśli przewinę listview, status pobierania zostanie zmieniony również dla innych elementów na liście. Poniżej znajduje się mój kod adaptera:
public class DownloadListAdapter extends BaseAdapter {
Context ctx;
public ArrayList<DownloadListDao> mDownloadList;
String readMoreLink;
public static final String TAG = "DownloadListAdapter";
ProgressDialog mProgressDialog;
private boolean isSDCardPresent;
File tieDir;
int downloadState[];
public DownloadListAdapter(Context ctx,
ArrayList<DownloadListDao> mDownloadList) {
this.ctx = ctx;
this.mDownloadList = mDownloadList;
downloadState = new int [mDownloadList.size()];
for(int i = 0; i < mDownloadList.size(); i++) {
downloadState[i] = 0;
}
tieDir = new File(Environment.getExternalStorageDirectory().toString()
+ "/tie");
}// Constructor
public int getCount() {
return this.mDownloadList.size();
}// getCount
public Object getItem(int position) {
return this.mDownloadList.get(position);
}// getItem
public long getItemId(int position) {
return 0;
}// getItemId
static class ViewHolder {
TextView txtTitle, txtTheme, txtDate;
ImageView imgDownload;
}// ViewHolder
ViewHolder holder;
public View getView(final int position, View convertView, ViewGroup parent) {
final String url = mDownloadList.get(position).getUrl();
if (convertView == null) {
convertView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.downlist_adapter, null);
holder = new ViewHolder();
holder.txtTitle = (TextView) convertView
.findViewById(R.id.txtTitle);
holder.txtTheme = (TextView) convertView
.findViewById(R.id.txtTheme);
holder.txtDate = (TextView) convertView.findViewById(R.id.txtDate);
holder.imgDownload = (ImageView) convertView
.findViewById(R.id.imgDload);
holder.imgDownload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File mediaFile = null;
if (url != null && !url.equals("null") && !url.equals("")) {
String fileName = url.toString().substring(
url.toString().lastIndexOf("/") + 1,
url.toString().length());
mediaFile = new File(tieDir, fileName);
}
processFile(mediaFile, url, position);
int pos = (Integer)v.getTag();
downloadState[pos] = 1;
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if (mDownloadList != null && mDownloadList.size() > 0) {
if (mDownloadList.get(position).getTitle() != null
&& !mDownloadList.get(position).getTitle().equals("null")
&& !mDownloadList.get(position).getTitle().equals("")) {
holder.txtTitle.setText(mDownloadList.get(position).getTitle());
}
if (mDownloadList.get(position).getTheme() != null
&& !mDownloadList.get(position).getTheme().equals("null")
&& !mDownloadList.get(position).getTheme().equals("")) {
holder.txtTheme.setText(mDownloadList.get(position).getTheme());
}
if (mDownloadList.get(position).getDate() != null
&& !mDownloadList.get(position).getDate().equals("null")
&& !mDownloadList.get(position).getDate().equals("")) {
holder.txtDate.setText(mDownloadList.get(position).getDate());
}
if (downloadState[position] == 1) {
holder.imgDownload.setImageDrawable(ctx.getResources()
.getDrawable(R.drawable.ic_dloaded));
} else {
holder.imgDownload.setImageDrawable(ctx.getResources()
.getDrawable(R.drawable.ic_dload));
}
}
holder.imgDownload.setTag(position);
return convertView;
}// getView
protected void downloadFile(String url, int position, String fileName) {
Log.v(TAG, "Preparing to download");
mProgressDialog = new ProgressDialog(ctx);
mProgressDialog.setMessage("Dowloading...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setMax(100);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
isSDCardPresent = Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
if (!isSDCardPresent) {
noSDCardAlert(ctx);
} else {
if ((tieDir.exists()) && (tieDir != null)) {
if (NetworkConnection.isOnline(ctx)) {
if (tieDir.isDirectory()) {
Log.v(TAG, "if tie dir URL:::" + url);
new DownloadAudioAsync(ctx, position, fileName).execute(url);
}
} else {
((DownloadListActivity) ctx)
.OpenNetErrDialog("Please check your internet connection...");
}
} else {
boolean isDirectoryCreated = tieDir.mkdirs();
if (isDirectoryCreated) {
Log.v(TAG, "if tie not dir URL:::" + url);
if (NetworkConnection.isOnline(ctx)) {
new DownloadAudioAsync(ctx, position, fileName).execute(url);
} else {
((DownloadListActivity) ctx)
.OpenWiFiDialog("Please check your internet connection...");
}
}
}
}
}
private void noSDCardAlert(Context ctx) {
AlertDialog.Builder ad = new AlertDialog.Builder(ctx);
ad.setMessage("No sd card present..");
ad.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
if (!((DownloadDetail) ctx).isFinishing()) {
ad.show();
}
}
public void OpenDialog(String messageID) {
final Dialog dialog = new Dialog(ctx,
android.R.style.Theme_Translucent_NoTitleBar);
dialog.setContentView(R.layout.dialog_base);
dialog.getWindow().getAttributes().windowAnimations = android.R.style.Animation_Dialog;
dialog.setCancelable(false);
TextView alertMessage = (TextView) dialog.findViewById(R.id.txtMessage);
Button btnOK = (Button) dialog.findViewById(R.id.btnOk);
btnOK.setText("Show");
alertMessage.setText(messageID);
dialog.show();
btnOK.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
}
protected void showPdf(File mediaFile) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(mediaFile), "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
ctx.startActivity(intent);
}
public class DownloadAudioAsync extends AsyncTask<String, String, String> {
Context ctx;
int pos;
private ProgressDialog pd;
String fileName;
public DownloadAudioAsync(Context ctx, int pos, String fileName) {
this.ctx = ctx;
this.pos = pos;
this.fileName = fileName;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.v(TAG, "inside on pre execute");
pd = new ProgressDialog(ctx);
pd.setMessage("Downloading...\nPlease wait..");
pd.show();
}
@Override
protected String doInBackground(String... aurl) {
int count;
try {
Log.v(TAG,
"inside do in background with url::"
+ aurl[0].toString());
aurl[0] = aurl[0].replaceAll(" ", "%20");
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
fileName = URLDecoder.decode(fileName, "UTF-8");
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(tieDir + "/"
+ fileName);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
}
return null;
}
@Override
protected void onPostExecute(String unused) {
if (!((DownloadListActivity) ctx).isFinishing()) {
pd.dismiss();
updateView(pos);
}
}
private void updateView(int pos) {
View v = ((DownloadListActivity) ctx).menuListView.getChildAt(pos
- ((DownloadListActivity) ctx).menuListView
.getFirstVisiblePosition());
ImageView imgDloadBtn = (ImageView) v.findViewById(R.id.imgDload);
imgDloadBtn.setImageDrawable(ctx.getResources().getDrawable(
R.drawable.ic_dloaded));
notifyDataSetChanged();
}
}
private void processFile(File mediaFile, String url, int pos) {
if (url != null && !url.equals("null") && !url.equals("")) {
if (mediaFile != null) {
Log.v(TAG, "in processFile FileName " + mediaFile.getName());
Log.v(TAG, "in processFile Position " + pos);
if(!mediaFile.exists()) {
Log.v(TAG, "in processFile Media file doesn't exists");
downloadFile(url, pos, mediaFile.getName());
} else {
Log.v(TAG, "in processFile Media file exists");
try {
showPdf(mediaFile);
} catch (ActivityNotFoundException anfe) {
OpenDialog("PDF Reader is not installed on your device.");
}
}
}
}
}
}// DownloadAdapter
przeczytałemten post do recyklingu widoku (dziękiKnickedi dogłębne wyjaśnienie). Ale nie wiem, gdzie jest rzeczywisty problem.