我使用一个公共的AsynTask来下载数据,我试图显示一个进度条,它会显示下载进度。我认为我的代码是正确的,但我得到的是一个微调进度对话框。我错过了什么吗?为什么不显示进度条?这是代码。 谢谢你的指点。我想要一个进度条,但得到一个微调progressdialog
public class FileDownloader extends AsyncTask<String, Integer, Void>
{
private Context _appContext;
private HttpURLConnection _urlConn;
private ProgressDialog _progressDia = null;
private DialogInterface.OnCancelListener _progDiaCancelListener = new DialogInterface.OnCancelListener()
{
/**
* When the progress dialog is canceled, stop the GET request.
*/
public void onCancel(DialogInterface dialog)
{
FileDownloader.this.cancel(true);
}
};
/**
* Constructor.
* @param appContext
*/
public FileDownloader(Context appContext)
{
_appContext = appContext;
_progressDia = new ProgressDialog(_appContext, ProgressDialog.STYLE_HORIZONTAL);
_progressDia.setMax(100);
_progressDia.setTitle(_appContext.getString(R.string.diaHeader1));
_progressDia.setMessage(_appContext.getString(R.string.diaBody1));
_progressDia.setCancelable(true);
_progressDia.setIndeterminate(false);
_progressDia.setOnCancelListener(_progDiaCancelListener);
}
// Runs on the UI thread
@Override
protected void onPreExecute()
{
_progressDia.setProgress(0);
_progressDia.show();
}
@Override
protected Void doInBackground(String... args)
{
String dloadURL = args[0],
saveLoc = args[1];
...
...
while((len = input.read(buf)) > 0)
{
output.write(buf, 0, len);
total += len;
publishProgress((int)total * 100/lenghtOfFile);
}
...
...
}
catch(SocketTimeoutException ex)
{
}
finally
{
...
}
// This is executed on main UI thread.
@Override
protected void onProgressUpdate(Integer... values)
{
_progressDia.setProgress(values[0]);
}
@Override
protected void onCancelled()
{
...
}
// This is executed on main UI thread.
@Override
protected void onPostExecute(Void result)
{
removeProgressDialog();
...
}
/**
* Remove the message dialog, if still showing.
*/
private void removeProgressDialog()
{
if(_progressDia != null && _progressDia.isShowing())
_progressDia.dismiss();
}
}
感谢 - 这工作。只有我必须改变的是使用单个参数构造函数并设置进度风格。 – 2010-07-25 04:52:12
谢谢,也帮助了我。我的错误是我正在调用'ProgressDialog.show(...);'然后设置所有其他参数 – Glogo 2015-03-10 10:07:25