Wednesday, August 11, 2010

show ProgressBar while processing in background in ANDROID

AIM: To show progress bar while doing work in background thread like downloading image/vedio/response etc..

Solution:
You can use AsyncTask   class which will do the background work in background thread while showing another UI(like progressbar,textview with loading or any other layout what ever you like) in UI thread.

You can do this by using the following code snippet.

Suppose you are downloading any thing from internet .here i am sending request to server and reading the response from the server.

The AsyncTask class which will does the background task.

       // ASync Task Begin to perform Billing information
private class performBackgroundTask extends Async Task < Void, Void, Void >  {

                private ProgressDialog Dialog = new ProgressDialog( this);

protected void onPreExecute() {
                       // here you have place code which you want to show in UI thread like progressbar or dialog or any layout . here  i am displaying a progressDialog with test please wait while loading......

                        Dialog.setMessage(" please wait while loading............");
Dialog.show();

              
}

protected Void doInBackground(Void... params) {
 // write here the code to download  or any background task.
                         DownloadVideo();  // example call method which will download vedio .
return null;
}

protected void onPostExecute(Void unused) {
                       Dialog.dismiss();    
// the background task is completed .You can do the code here for next things

}

}

Call this method with the following line whereever you wants .for example like oncreate() or in anybutton handler as follows:
 new performBackgroundTask().execute();

Thats it.by this way we can solve the problem.


35 comments:

  1. thanks,

    I wonder if we can change the progressdialog to a progressBar? Can you post an example for this?

    ReplyDelete
  2. ProgressBar myProgressBar;
    int myProgress = 0;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    Log.d("SuccessfulScreen","Show progress bar and view button to view the content.");

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);


    //set control made in XML
    setContentView(R.layout.success);
    Log.d("Progress bar", "Start count progress bar to 10");

    myProgressBar=(ProgressBar)findViewById(R.id.progressbar_Library);

    new Thread(myThread).start();

    Button btn = (Button) findViewById(R.id.view_btn);
    btn.setOnClickListener(this);

    }

    private Runnable myThread = new Runnable(){

    @Override
    public void run() {
    // TODO Auto-generated method stub
    while (myProgress<10){
    try{
    Log.d("myProgress","myProgress count is " +myProgress);
    myHandle.sendMessage(myHandle.obtainMessage());
    Thread.sleep(1000);

    }
    catch(Throwable t){
    Log.d("catch message","show message" + t.getMessage());
    }
    }
    //---hides the progress bar---
    myHandle.post(new Runnable()
    {
    public void run() {
    //---0 - VISIBLE; 4 - INVISIBLE; 8 - GONE---
    //myProgressBar.setVisibility(8);

    Log.d("successed message","message will show in textview");
    TextView textmsg = (TextView) findViewById(R.id.successmessage);
    textmsg.setText("The file is now saved to My Library which is located in the More category");
    Log.d("successed message","text nmessage" +textmsg.getText());
    Button btnview = (Button) findViewById(R.id.view_btn);
    //btnview.setEnabled(true); android:enabled="false"
    btnview.setVisibility(0);
    }
    });
    }

    Handler myHandle = new Handler(){

    @Override
    public void handleMessage(Message msg) {
    // TODO Auto-generated method stub
    myProgress++;
    myProgressBar.setProgress(myProgress);
    }
    };
    };

    ReplyDelete
  3. This comment has been removed by the author.

    ReplyDelete
  4. This comment has been removed by a blog administrator.

    ReplyDelete
  5. I am getting the error at this line
    private ProgressDialog Dialog = new ProgressDialog( this);

    The Error is:
    The constructor ProgressDialog(AsyncTaskTest.performBackgroundTask) is undefined

    ReplyDelete
  6. I didn't understand what your problem exactly.
    Probably,this 2 approaches may be useful for you.

    1)add the above declaration line in Oncreate() method.
    2)instead of
    new ProgressDialog( this);
    replace "this " with application context (or) classname.this.

    please check for any error that is happening in in BackgroundProcess like nullpointers,any exceptions.

    ReplyDelete
  7. thanks. exactly what i was looking for :)

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