Hello,
I have a problem about Button's onClick().
I startActivity() in onClick() handler. And if I tapped a button twice very
quickly,
it started activity twice. (therefore there are two instances of the same
activity).
I think it is (or should be) very simple for a button to start another
activity and
following code snippet is the straight-forward way to do that.
<snippet>
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button b = (Button) findViewById(R.id.button);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, SubActivity.class));
}
});
}
}
</snippet>
To re-produce the undesired behavior, I added Thread.sleep(1000) in
onClick().
<snippet>
@Override
public void onClick(View v) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
startActivity(new Intent(MainActivity.this, SubActivity.class));
}
</snippet>
Now, I can tap a button twice while it is shown as pressed and the
SubActivity
is started twice.
I googled for solution and found lots of hacks to avoid this
double-tapping problem.
However, if it is required to do some special trick whenever I want to
start an activity
by clicking a button, it can be a big problem as a GUI framework.
(I cannot think of a framework which requires a special handling
for every button click event to avoid double-clicking)
Is there a standard way of starting activity by clicking a button without
worrying the double-clicking issues?
Thanks in advance.
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