Question

So i am trying to launch a progress dialog from an async task.

in my main activity i am invoking the async task like so:

new OCRScanAsyncTask(getApplication().getApplicationContext()).execute();

also tried:

new OCRScanAsyncTask(getBaseContext()).execute();

my asyncTask looks like this:

public class OCRScanAsyncTask extends AsyncTask<String, Integer, Boolean> {

    /* (non-Javadoc)
     * @see android.os.AsyncTask#doInBackground(Params[])
     */
    private ProgressDialog progressDialog;
    private String TAG ="OCRAsyncTask";
    private String IMAGE_PATH = Environment.getExternalStorageDirectory() + "/bcCardReader/tmp/tmpCrd.jpg";
    public static final String DATA_PATH = Environment
            .getExternalStorageDirectory().toString() +"/bcCardReader/tmp/";

    private String lang = "eng";
    private Context context;


    public OCRScanAsyncTask(Context c){
       Log.v(TAG, "*****************CONSTRUCTING");
        context = c;
        progressDialog = new ProgressDialog(context);
    }
    @Override
    protected void onPreExecute(){

        super.onPreExecute();
        Log.v(TAG, "pre exe");
        progressDialog.setTitle("Please Wait");
        progressDialog.setMessage("Performing Character Recognition");
        progressDialog.setIndeterminate(false);
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setCancelable(false);
        progressDialog.show();

    }
............

my error looks like this:

Answer 1

bad window token on progressDialog in async task

Most likely is problem with Context variable. So my first suggestion is replace your line

new OCRScanAsyncTask(getApplication().getApplicationContext()).execute();

with

new OCRScanAsyncTask(YourActivityName.this).execute();

Note: I recommend to you to show progressDialog before you will start AsyncTask.

ProgressDialog pd = new ProgressDialog(this); // or YourActivityName.this
pd.setMessage("some message");
pd.show();
AsyncWorker w = new AsyncWorker();
w.execute();