I want to show a ProgressBar while doing some background operation,
but my code seems not to work. I hope someone can help me to solve
this problem. Thank you in advance!Here is my code and explanation :
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch(item.getItemId()) {
case CASEONE_ID:
ProgressBar progress = (ProgressBar)findViewById
(R.id.ProgressBar);
progress.setVisibility(View.VISIBLE);
progress.bringToFront();
progress.invalidate();
backgroundWork();
progress.setVisibility(View.GONE);
progress.invalidate();
return true;
}
return super.onMenuItemSelected(featureId, item);
}/*In fact I never see the progressbar by this code, instead the
program will keep frozen until backgroundWork() finish. But what I
want is the progressbar can appear in the screen while backgroungWork
() is being processed.
private void backgroundWork(){
for(int i=0;i<1E8;i++);
}/*This is not the exact work I did in my own program. I change it to
this form is just to tell you my operation will occupy the processor
for long time.*/
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