我有一个异步任务
new DownloadFile（）。execute（url2.toString（））;
我什么时候在网址上找到一个mp3文件，例如www.xyz.com/preview.mp3
我调用上面的异步任务
new DownloadFile（）。execute（url2.toString（））;
然后我在列表视图中也有一个进度条，但现在进度条没有更新 我使用自定义适配器并正确地充气了视图。
public class CopyOfDownloadsListActivity extends ListActivity {
/** Called when the activity is first created. */
// static ArrayList<String> pthreads = new ArrayList<String>();
static ImageView bt;
static ProgressBar pb;
static ListView allList;
static TextView tv;
String fileName;
String mp3URL;
URL url2;
int myProgress;
static int filecount = 0;
MyCustomAdapter adapter;
private class DownloadFile extends AsyncTask<String, Integer, Void>{
int count = 0;
ProgressDialog dialog;
int myProgess = 0;
ProgressBar progressBar;
@Override
protected Void doInBackground(String... u) {
try {
URL ul = new URL(u[0]);
Log.i("UI",ul.toString());
// int len = CopyOfMusicDownloader.mp3urls.size();
// URL url2 = new URL(CopyOfMusicDownloader.mp3urls.get(len-1));
HttpURLConnection c = (HttpURLConnection) ul.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
int lengthOfFile = c.getContentLength();
String PATH = Environment.getExternalStorageDirectory()
+ "/download/";
Log.v("", "PATH: " + PATH);
File file = new File(PATH);
file.mkdirs();
fileName = "Track";
filecount++;
fileName = fileName + Integer.toString(filecount) + ".mp3";
File outputFile = new File(file, fileName);
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
myProgress = (int)(len1*100/lengthOfFile);
//myProgress = (int)(len1);
Log.i("My Progress", Integer.toString(myProgress));
publishProgress(myProgress);
// publishProgress((int)(len1*100/lengthOfFile));
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
}catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute() {
}
@Override
protected void onPreExecute() {
setListAdapter(new MyCustomAdapter(CopyOfDownloadsListActivity.this, R.layout.row, CopyOfMusicDownloader.mp3urls));
}
@Override
protected void onProgressUpdate(Integer... values) {
pb.setProgress(count);// HERE IS THE PROBLEM
count++;
Log.i("Values", Integer.toString(values[0]));
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
int len = CopyOfMusicDownloader.mp3urls.size();
try {
url2 = new URL(CopyOfMusicDownloader.mp3urls.get(len-1));
new DownloadFile().execute(url2.toString());
Log.i("url",url2.toString());
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater myMenuInflater = getMenuInflater();
myMenuInflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case(R.id.browsermenu):
Intent i = new Intent(CopyOfDownloadsListActivity.this, MusicDownloader.class);
startActivity(i);
break;
case(R.id.downloaderrmenu):
break;
case(R.id.playermenu):
Intent j = new Intent(CopyOfDownloadsListActivity.this, Players.class);
startActivity(j);
break;
}
return true;
}
public class MyCustomAdapter extends ArrayAdapter<String> {
public MyCustomAdapter(Context context, int textViewResourceId, ArrayList<String> pthreads) {
super(context, textViewResourceId, pthreads);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = getLayoutInflater();
View row = inflater.inflate(R.layout.row, parent, false);
bt =(ImageView)row.findViewById(R.id.cancel_btn);
tv =(TextView)row.findViewById(R.id.filetext);
pb = (ProgressBar)row.findViewById(R.id.progressbar_Horizontal);
return row;
}
}
}
答案 0 :(得分：1)
是你在寻找什么？
private class DownloadFile extends AsyncTask<String, Integer, Void> {
ProgressBar progressBar;
public DownloadFile(ProgressBar progressBar) {
this.progressBar=progressBar;
}
@Override
protected void onProgressUpdate(Integer... values) {
progressBar.setProgress(count);
}
}
现在，每个DownloadFile Task都有自己的ProgressBar。
答案 1 :(得分：0)
我认为这就是问题（我没有测试你的代码）
myProgress = (int)(len1*100/lengthOfFile);
这必须看起来像这样
myProgress += (int)(len1*100/lengthOfFile);
答案 2 :(得分：0)
我知道这个问题很老，但有人可能会像我一样。这是我的代码。也许这不是最好的方法，但我需要尽快使其工作。 我的适配器元素
<强> ChatRow
public class ChatRow {
private int progressCount;
private boolean sending;
public boolean isSending()
{
return sending;
}
public void setSending(boolean sending)
{
this.sending = sending;
}
public int getProgressCount() {
return progressCount;
}
public void setProgressCount(int progressCount) {
this.progressCount = progressCount;
}
}
在我的适配器的getView方法上我有这部分代码
if (row.isSending()) {
holder.progressBar.setVisibility(View.VISIBLE);
holder.progressBar.setProgress(row.getProgressCount());
}
这就在我的AsyncTask上 的 SendFileTask
private class SendFileTask extends AsyncTask<String, Integer, Boolean> {
private ChatRow row;
public SendFileTask(int rowNumber) {
this.row = adapter.getItem(rowNumber);
}
@Override
protected void onProgressUpdate(Integer... values) {
Logger.d(String.format("progress[%d]", values[0]));
row.setProgressCount(values[0]);
adapter.notifyDataSetChanged();
}
@Override
protected void onPostExecute(Boolean result) {
row.setSending(false);
row.setProgressCount(0);
adapter.notifyDataSetChanged();
}