我有一个从片段调用的类.在进度更新被调用但消息不会更新.我也没有看到任何进度条或微调器.只是标题和消息,看到一些类似的问题,但没有任何进度条根本没有显示.此外,我的消息根本不会在onProgressUpdate中更新,但打印出的值确实显示它在onProgressUpdate内增量.
编辑：这是我开始任务的方式
DownloadFilesTask download = new DownloadFilesTask(); download.execute(urls.toArray(new String[urls.size()]));
这是班级
private class DownloadFilesTask extends AsyncTask<String,Integer,Long> {
ProgressDialog progressDialog;
@Override
protected void onPreExecute()
{
progressDialog = ProgressDialog.show(getActivity(),"Downloading","Downloaded 0/"+urls.size(),false);
progressDialog.setProgress(0);
progressDialog.setMax(urls.size());
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
}
@Override
protected Long doInBackground(String[] urls) {
int count = urls.length;
long totalSize = 0;
for (int i = 0; i < count; i++) {
//Do things in background here
publishProgress(new Integer[] {i});
}
return totalSize;
}
@Override
protected void onProgressUpdate(final Integer... progress) {
System.out.println(progress[0]); //This does print correctly
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog.setProgress(progress[0]);
progressDialog.setMessage("Downloaded "+ progress[0] +"/"+urls.size());
}
});
}
@Override
protected void onPostExecute(Long result) {
progressDialog.dismiss();
Toast t = Toast.makeText(getActivity(),"Downloaded",Toast.LENGTH_LONG);
t.show();
}
}
解决方法
问题在于您的ProgressDialog初始化方式.
用这个替换你的onPreExecute：
@Override
protected void onPreExecute() {
progressDialog = new ProgressDialog(activity);
progressDialog.setTitle("Downloading");
progressDialog.setMessage("Downloaded 0/" + urls.size());
progressDialog.setIndeterminate(false);
progressDialog.setProgress(0);
progressDialog.setMax(urls.size());
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.show();
}
基本上,您需要在调用show之前调用setProgressStyle.
此外,您可以删除onProgressUpdate中的runOnUiThread代码,因为在UI线程上调用onProgressUpdate.
