在Android中，进度条在到达终点之前消失
我正在尝试使用异步任务下载视频文件。视频正在完美下载，但进度条在结束前消失，并再次开始下载。下载图像文件时不会发生这种情况 这是我的密码 FileDownloadTask.Java在Android中，进度条在到达终点之前消失,android,android-asynctask,progress-bar,Android,Android Asynctask,Progress Bar,我正在尝试使用异步任务下载视频文件。视频正在完美下载，但进度条在结束前消失，并再次开始下载。下载图像文件时不会发生这种情况 这是我的密码 FileDownloadTask.Java public class FileDownloadTask extends AsyncTask<String, Integer, String> { private static final String TAG = FileDownloadTask.class.getSimpleName(
public class FileDownloadTask extends AsyncTask<String, Integer, String> {
private static final String TAG = FileDownloadTask.class.getSimpleName();
final DownloadInfo mInfo;
//public static String file_url = "http://www.gettyimages.ca/gi-resources/images/Homepage/Category-Creative/UK/UK_Creative_462809583.jpg";
//public static String file_url="http://imaze.net/apps/groups/123.mp4";
// Context context=getApplicationContext();
public FileDownloadTask(DownloadInfo info) {
mInfo = info;
}
@Override
protected void onProgressUpdate(Integer... values) {
mInfo.setProgress(values[0]);
ProgressBar bar = mInfo.getProgressBar();
if(bar != null) {
bar.setProgress(mInfo.getProgress());
bar.invalidate();
}
}
@Override
protected String doInBackground(String... f_url) {
int count;
try {
String root = Environment.getExternalStorageDirectory().toString();
System.out.println("Downloading");
URL url = new URL(mInfo.getFileUrl());
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
// Output stream to write file
File rootdirectory= new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES),"Youtube Videos");
if(!rootdirectory.exists())
{
rootdirectory.mkdirs();
}
String nameoffile= URLUtil.guessFileName(mInfo.getFileUrl(),null, MimeTypeMap.getFileExtensionFromUrl(mInfo.getFileUrl()));
File file= new File(rootdirectory,nameoffile);
file.createNewFile();
mInfo.setDownloadState(DownloadState.DOWNLOADING);
InputStream input = new BufferedInputStream(url.openStream(), 8192);
OutputStream output = new FileOutputStream(file);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress((int)(total*1001)/lenghtOfFile);
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
// Intent intent=new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
// intent.setData(Uri.parse(file_url));
// getActivity().sendBroadcast(intent);
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
mInfo.setDownloadState(DownloadState.COMPLETE);
return null;
}
protected void onPostExecute(String file_url) {
mInfo.setDownloadState(DownloadState.COMPLETE);
}
@Override
protected void onPreExecute() {
mInfo.setDownloadState(DownloadState.DOWNLOADING);
}
}
import android.util.Log;
import android.widget.ProgressBar;
public class DownloadInfo {
private final static String TAG = DownloadInfo.class.getSimpleName();
public enum DownloadState {
NOT_STARTED,
QUEUED,
DOWNLOADING,
COMPLETE
}
private volatile DownloadState mDownloadState = DownloadState.NOT_STARTED;
private String mFilename;
// private final String mFileUrl;
private Integer mFileSize;
private String mFileUrl="";
private volatile Integer mProgress;
// private final Integer mFileSize;
private volatile ProgressBar mProgressBar;
public DownloadInfo(String filename, String FileUrl) {
mFilename = filename;
mProgress = 0;
mFileUrl = FileUrl;
// mFileSize = mFileSize;
// mFileSize = size;
mProgressBar = null;
}
public ProgressBar getProgressBar() {
return mProgressBar;
}
public void setProgressBar(ProgressBar progressBar) {
Log.d(TAG, "setProgressBar " + mFilename + " to " + progressBar);
mProgressBar = progressBar;
}
public void setDownloadState(DownloadState state) {
mDownloadState = state;
}
public DownloadState getDownloadState() {
return mDownloadState;
}
public Integer getProgress() {
return mProgress;
}
public void setProgress(Integer progress) {
this.mProgress = progress;
}
//
// public Integer getFileSize() {
// return mFileSize;
// }
public Integer getFileSize() {
return mFileSize;
}
public void setFileSize(Integer FileSize) {
mFileSize = FileSize;
}
// public void setFileUrl(String FileUrl)
// {
// this.FileUrl = FileUrl;
// }
public String getFilename() {
return mFilename;
}
public String getFileUrl()
{
return mFileUrl;
}
}
public class DownloadInfoArrayAdapter extends ArrayAdapter<DownloadInfo> {
// Simple class to make it so that we don't have to call findViewById frequently
private static class ViewHolder {
TextView textView;
ProgressBar progressBar;
Button button;
DownloadInfo info;
}
private static final String TAG = DownloadInfoArrayAdapter.class.getSimpleName();
public DownloadInfoArrayAdapter(Context context, int textViewResourceId,
List<DownloadInfo> objects) {
super(context, textViewResourceId, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
final DownloadInfo info = getItem(position);
// We need to set the convertView's progressBar to null.
ViewHolder holder = null;
if(null == row) {
LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.file_download_row, parent, false);
holder = new ViewHolder();
holder.textView = (TextView) row.findViewById(R.id.downloadFileName);
holder.progressBar = (ProgressBar) row.findViewById(R.id.downloadProgressBar);
holder.button = (Button)row.findViewById(R.id.downloadButton);
holder.info = info;
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
holder.info.setProgressBar(null);
holder.info = info;
holder.info.setProgressBar(holder.progressBar);
}
holder.textView.setText(info.getFilename());
holder.progressBar.setProgress(info.getProgress());
holder.progressBar.setMax(100);
info.setProgressBar(holder.progressBar);
holder.button.setEnabled(info.getDownloadState() == DownloadState.NOT_STARTED);
final Button button = holder.button;
holder.button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
info.setDownloadState(DownloadState.QUEUED);
button.setEnabled(false);
button.invalidate();
FileDownloadTask task = new FileDownloadTask(info);
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
});
//TODO: When reusing a view, invalidate the current progressBar.
return row;
}
}
public class FileDownloadTask extends AsyncTask<String, Integer, String> {
private static final String TAG = FileDownloadTask.class.getSimpleName();
final DownloadInfo mInfo;
//public static String file_url = "http://www.gettyimages.ca/gi-resources/images/Homepage/Category-Creative/UK/UK_Creative_462809583.jpg";
//public static String file_url="http://imaze.net/apps/groups/123.mp4";
// Context context=getApplicationContext();
public FileDownloadTask(DownloadInfo info) {
mInfo = info;
}
@Override
protected void onProgressUpdate(Integer... values) {
mInfo.setProgress(values[0]);
ProgressBar bar = mInfo.getProgressBar();
if(bar != null) {
bar.setProgress(mInfo.getProgress());
bar.invalidate();
}
}
@Override
protected String doInBackground(String... f_url) {
int count;
try {
String root = Environment.getExternalStorageDirectory().toString();
System.out.println("Downloading");
URL url = new URL(mInfo.getFileUrl());
URLConnection conection = url.openConnection();
conection.connect();
// getting file length
int lenghtOfFile = conection.getContentLength();
// input stream to read file - with 8k buffer
// Output stream to write file
File rootdirectory= new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES),"Youtube Videos");
if(!rootdirectory.exists())
{
rootdirectory.mkdirs();
}
String nameoffile= URLUtil.guessFileName(mInfo.getFileUrl(),null, MimeTypeMap.getFileExtensionFromUrl(mInfo.getFileUrl()));
File file= new File(rootdirectory,nameoffile);
file.createNewFile();
mInfo.setDownloadState(DownloadState.DOWNLOADING);
InputStream input = new BufferedInputStream(url.openStream(), 8192);
OutputStream output = new FileOutputStream(file);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress((int)(total*1001)/lenghtOfFile);
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
// Intent intent=new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
// intent.setData(Uri.parse(file_url));
// getActivity().sendBroadcast(intent);
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
mInfo.setDownloadState(DownloadState.COMPLETE);
return null;
}
protected void onPostExecute(String file_url) {
mInfo.setDownloadState(DownloadState.COMPLETE);
}
@Override
protected void onPreExecute() {
mInfo.setDownloadState(DownloadState.DOWNLOADING);
}
}
import android.util.Log;
import android.widget.ProgressBar;
public class DownloadInfo {
private final static String TAG = DownloadInfo.class.getSimpleName();
public enum DownloadState {
NOT_STARTED,
QUEUED,
DOWNLOADING,
COMPLETE
}
private volatile DownloadState mDownloadState = DownloadState.NOT_STARTED;
private String mFilename;
// private final String mFileUrl;
private Integer mFileSize;
private String mFileUrl="";
private volatile Integer mProgress;
// private final Integer mFileSize;
private volatile ProgressBar mProgressBar;
public DownloadInfo(String filename, String FileUrl) {
mFilename = filename;
mProgress = 0;
mFileUrl = FileUrl;
// mFileSize = mFileSize;
// mFileSize = size;
mProgressBar = null;
}
public ProgressBar getProgressBar() {
return mProgressBar;
}
public void setProgressBar(ProgressBar progressBar) {
Log.d(TAG, "setProgressBar " + mFilename + " to " + progressBar);
mProgressBar = progressBar;
}
public void setDownloadState(DownloadState state) {
mDownloadState = state;
}
public DownloadState getDownloadState() {
return mDownloadState;
}
public Integer getProgress() {
return mProgress;
}
public void setProgress(Integer progress) {
this.mProgress = progress;
}
//
// public Integer getFileSize() {
// return mFileSize;
// }
public Integer getFileSize() {
return mFileSize;
}
public void setFileSize(Integer FileSize) {
mFileSize = FileSize;
}
// public void setFileUrl(String FileUrl)
// {
// this.FileUrl = FileUrl;
// }
public String getFilename() {
return mFilename;
}
public String getFileUrl()
{
return mFileUrl;
}
}
public class DownloadInfoArrayAdapter extends ArrayAdapter<DownloadInfo> {
// Simple class to make it so that we don't have to call findViewById frequently
private static class ViewHolder {
TextView textView;
ProgressBar progressBar;
Button button;
DownloadInfo info;
}
private static final String TAG = DownloadInfoArrayAdapter.class.getSimpleName();
public DownloadInfoArrayAdapter(Context context, int textViewResourceId,
List<DownloadInfo> objects) {
super(context, textViewResourceId, objects);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
final DownloadInfo info = getItem(position);
// We need to set the convertView's progressBar to null.
ViewHolder holder = null;
if(null == row) {
LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.file_download_row, parent, false);
holder = new ViewHolder();
holder.textView = (TextView) row.findViewById(R.id.downloadFileName);
holder.progressBar = (ProgressBar) row.findViewById(R.id.downloadProgressBar);
holder.button = (Button)row.findViewById(R.id.downloadButton);
holder.info = info;
row.setTag(holder);
} else {
holder = (ViewHolder) row.getTag();
holder.info.setProgressBar(null);
holder.info = info;
holder.info.setProgressBar(holder.progressBar);
}
holder.textView.setText(info.getFilename());
holder.progressBar.setProgress(info.getProgress());
holder.progressBar.setMax(100);
info.setProgressBar(holder.progressBar);
holder.button.setEnabled(info.getDownloadState() == DownloadState.NOT_STARTED);
final Button button = holder.button;
holder.button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
info.setDownloadState(DownloadState.QUEUED);
button.setEnabled(false);
button.invalidate();
FileDownloadTask task = new FileDownloadTask(info);
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
});
//TODO: When reusing a view, invalidate the current progressBar.
return row;
}
}
公共类下载InfoArrayAdapter扩展了ArrayAdapter{
//简单的类，这样我们就不必频繁调用findViewById
私有静态类视图持有者{
文本视图文本视图；
ProgressBar ProgressBar；
按钮；
下载资讯；
}
private static final String TAG=DownloadInfoArrayAdapter.class.getSimpleName（）；
公开下载InfoArrayAdapter（上下文，int textViewResourceId，
列出对象）{
超级（上下文、textViewResourceId、对象）；
}
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
视图行=转换视图；
最终下载信息=getItem（位置）；
//我们需要将convertView的progressBar设置为null。
ViewHolder=null；
如果（空==行）{
LayoutInflater充气器=（LayoutInflater）getContext（）.getSystemService（Context.LAYOUT\u充气器\u SERVICE）；
行=充气机。充气（R.layout.file\u download\u行，父级，false）；
holder=新的ViewHolder（）；
holder.textView=（textView）row.findViewById（R.id.downloadFileName）；
holder.progressBar=（progressBar）row.findViewById（R.id.downloadProgressBar）；
holder.button=（button）row.findViewById（R.id.downloadButton）；
holder.info=info；
row.setTag（支架）；
}否则{
holder=（ViewHolder）row.getTag（）；
holder.info.setProgressBar（空）；
holder.info=info；
holder.info.setProgressBar（holder.progressBar）；
}
holder.textView.setText（info.getFilename（））；
holder.progressBar.setProgress（info.getProgress（））；
保持架.进度条.设定最大值（100）；
信息设置进度条（持有者进度条）；
holder.button.setEnabled（info.getDownloadState（）==DownloadState.NOT_start）；
最终按钮=保持架按钮；
holder.button.setOnClickListener（新的OnClickListener（）{
@凌驾
公共void onClick（视图v）{
info.setDownloadState（DownloadState.QUEUED）；
按钮。设置启用（错误）；
按钮。无效（）；
FileDownloadTask任务=新建FileDownloadTask（信息）；
task.executeOnExecutor（异步task.THREAD\u POOL\u EXECUTOR）；
}
});
//TODO:重用视图时，使当前进度栏无效。
返回行；
}
}
条无效（）onProgressUpdateFileDownloadTask.Javabar.invalidate（）bar.postInvalidate（）否。。在适配器类中放置“holder.progressBar.setMax（100）；”时也会发生同样的情况。这是问题吗？如果是，那么我应该写什么？