Hi all,
I have a main activity that launches a sub activity when the user
clicks a button as follows:
private OnClickListener buttonDirectoryListener = new OnClickListener
() {
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(Main.this, Sub.class);
startActivity(intent);
}
}
Unfortunatly, the onCreate method of the sub activity can take a long
time (server request, xml parsing, custom layout creation, ...). So I
want to display an indeterminate ProgressDialog while the sub activity
is being created and then dismiss it when main activity is no longer
visible. I found a few threads claiming that a separate thread
is needed to run the progress dialog. So I updated my code as follows:
ProgressDialog pd;
private OnClickListener buttonDirectoryListener = new OnClickListener
() {
public void onClick(View v) {
pd = new ProgressDialog(this);
pd.setIndeterminate(true);
pd.show();
new Thread() {
public void run() {
Intent intent = new Intent();
intent.setClass(Main.this, Sub.class);
startActivity(intent);
}
}.start();
}
}
@Override
public void onStop() {
super.onStop();
pd.dismiss();
}
It seems to work sometime. But most of the time, the ProgressDialog is
not showing (or disappareing fastly), I only get a black sreen until
the sub activity is shown. Poor effect. I guess it might lead to an
ANR dialog in real situation. I guess the main activity receives
onStop event before the sub activity is shown. I would like to
indicate loading through the ProgressDialog until the sub activity
gets ready to be displayed.
I'm convinced other developers are facing such a problem and I'm
probably doing something wrong. Any help is welcome. Thanks.
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