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How to provide a progress bar to download?

In my application, I upload a video file. I want to show a progress bar to download.

How is this possible with the AsyncTask concept?

Thank,

Nicky

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2 answers

Use the onProgressUpdate method for AsyncTask.

If you know the file size, you can set the maximum value in onPreExecute:

protected void onPreExecute() {
  ProgressDialog myDialog = new ProgressDialog(context);
  myDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
  myDialog.setMax(maxValue);
  myDialog.show();
}

EDIT: added myDialog.show ();

There are several ways to update progress, either by increasing the amount, or by setting the progress to a specific value:

@Override
protected void onProgressUpdate(Integer... progress) {
  myDialog.incrementProgressBy(progress[0]);

  // or
  // myDialog.setProgress(progress[0]);

}

Then in onDoInBackground ():

@Override
protected void doInBackGround() {
  // your code
  publishProgress(1);
}

Example EDIT with progress indicator in layout:

In your layout file add a progress indicator like this

<ProgressBar
    android:id="@+id/progressbar"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    style="?android:attr/progressBarStyleHorizontal"
    android:visibility="gone"
    />

And in your asintet:

protected void onPreExecute() {
  ProgressBar myProgress = findViewById(R.id.progressbar);
  myProgress.setMax(maxValue);
  myProgress.setVisibility(View.VISIBLE);
}

protected void onProgressUpdate(Integer... progress) {
  myProgress.setProgress(progress[0]);
}
+6

timi, .

new Thread(new Runnable() {
         public void run() {
             while (mProgressStatus < 100) {
                 mProgressStatus = doWork();

                 // Update the progress bar
                 mHandler.post(new Runnable() {
                     public void run() {
                         mProgress.setProgress(mProgressStatus);
                     }
                 });


//once the connection has been opened

List values = urlConnection.getHeaderFields().get("content-Length")
if (values != null && !values.isEmpty()) {

// getHeaderFields() returns a Map with key=(String) header 
// name, value = List of String values for that header field. 
// just use the first value here.
String sLength = (String) values.get(0);

if (sLength != null) {
   //parse the length into an integer...
   }
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