Android Progress bar not hiding

Question

I have a toolbar in my Android app where, when a user clicks a button, preogressDialog ("Please Wait") opens and the next activity loads. But when I press the bacj button of the Android device, a progress indicator is still displayed. I used firing (), but to no avail. Any help is appreciated.

progressDialog.setMessage("Please wait...");
progressDialog.setIndeterminate(true);
progressDialog.setCancelable(true);
progressDialog.show();
browseCategories();

protected void browseCategories() {
        Log.i(MY_DEBUG_TAG, "Bow!");
        Intent c = new Intent(this, CategoryListActivity.class);
    c.putExtra("user", u);
    startActivity(c);
}

Answer 1

Using the progress dialogue in action immediately before launching another makes no sense.

The activity is for the most part oriented towards the user interface, and at the first launch a new one is “superimposed” over the first.

CategoryListActivity , (, ), , , . AsyncTask , , - .

Answer 2

XMl :

   <ProgressBar 
        android:layout_marginTop="60dip"
        android:layout_gravity="center_horizontal"  
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/prgressbar"
        android:visibility="invisible"
      />

Onclick :

ProgressBar prgressbar;
prgressbar=(ProgressBar)findViewById(R.id.prgressbar);

prgressbar.setVisibility(LinearLayout.VISIBLE); // this of visible the progress bar 

prgressbar.setVisibility(LinearLayout.INVISIBLE); // this is for invisible