The Android Application Framework FAQ states:
"The general mechanism to start a new activity if its not running— or
to bring the activity stack to the front if is already running in the
background— is the to use the NEW_TASK_LAUNCH flag in the startActivity
() call."
I have some fairly simple code that allows the user to switch between
running tasks. Most of the time things work fine, but there a few
scenarios that cause my program to crash.
First, here is the code that I am using to bring a "running" activity
to the foreground:
ActivityManager.RunningTaskInfo task = getTask(idx);
if (task != null)
{
Intent intent = new Intent();
intent.setClassName(task.topActivity.getPackageName(),
task.topActivity.getClassName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
try
{
m_context.startActivity(intent);
}
catch (ActivityNotFoundException e)
{
Toast.makeText(m_context, "Unable to launch activity...",
Toast.LENGTH_SHORT).show();
}
}
- Crash Scenario 1:
Switching to any task in the list of running task that has started
another activity (i.e. task.topActivity and task.baseActivity are
different) causes a crash. I have tried the code above using both
task.topActivity and task.baseActivity but the results are the same...
force close.
- Crash Scenario 2:
Switching to specific tasks always causes a force close. For example,
when I try to switch to the Calendar Task when it is "running" my
program always crashes. However, I can successfully switch to Google
Maps, Home, Browser, and most others.
For the Calendar Task, I am getting "com.android.calendar.DayActivity"
and the class name and "com.android.calendar" as the package name.
When running the Eclipse Debugger, I get a new tab that pops up in
Eclipse when executing the m_context.startActivity(intent); line...
The title in the tab says "ViewRoot.handleMessage(Message) line: 1583"
and in the tab is text in red that says "Source not found" and a
button that says "Edit Source Lookup Path"
I'm very baffled here and have not been able to find anything online
or in the google groups regarding this issue. I hope that someone has
an idea of what I am doing wrong. There are other task switcher
applications available on the Android Market that do not have this
problem.
Thanks in advance!
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