I have an app with an activity and a service. The service schedules a
function to run using timer.scheduleAtFixedRate. When the timer task
runs, I want to update some TextView objects in the Activity's UI, so
that the user knows that the service has run, and the last thing it
did.
So in the timer task I do:
Intent intent = new
Intent("com.edgreenberg.TextMessageServer.UPDATE_SCREEN");
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd
HH:mm:ss");
Date date = new Date();
intent.putExtra("time", dateFormat.format(date));
intent.putExtra("numberMsgs",numberMsgs);
sendBroadcast(intent);
Then, in the activity, I created:
private int numMsgs1;
private String dateTime1;
public class CustomBroadCast extends BroadcastReceiver {
public CustomBroadCast(){
}
/**
* @see
android.content.BroadcastReceiver#onReceive(Context,Intent)
*/
//public static final String TAG = "CustomBroadCast";
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals("com.edgreenberg.TextMessageServer.UPDATE_SCREEN"))
{
Log.i("INFORMATION","Broadcasting message");
dateTime1 = intent.getStringExtra("time");
numMsgs1 = intent.getIntExtra("numberMsgs", 0);
// gotta get this to the gui thread somehow.
handler.sendEmptyMessage(0);
}
}
}
Now, where it says "gotta get this to the gui thread somehow" is where
I previously did dateTime.setText(dateTime1), but according to what I
read, that shouldn't work. And it doesn't :)
So I sent the empty message using the handler, as shown below:
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
final TextView dateTime,numMsgs;
dateTime = (TextView) findViewById(R.id.datetime);
numMsgs = (TextView) findViewById(R.id.numMsgs);
dateTime.setText(dateTime1);
numMsgs.setText(numMsgs1);
}
};
Now this, I expect to work. It doesn't. The screen stays mute. In
fact, the debugger tells me that:
Thread [<3> main] (Suspended (exception Resources$NotFoundException))
Resources.getText(int) line: 205
TextView.setText(int) line: 2809
TextMessageControlPanel$1.handleMessage(Message) line: 38
TextMessageControlPanel$1(Handler).dispatchMessage(Message) line: 99
Looper.loop() line: 123
ActivityThread.main(String[]) line: 4203
Method.invokeNative(Object, Object[], Class, Class[], Class, int,
boolean) line: not available [native method]
Method.invoke(Object, Object...) line: 521
ZygoteInit$MethodAndArgsCaller.run() line: 791
ZygoteInit.main(String[]) line: 549
NativeStart.main(String[]) line: not available [native method]
It feels like something is out of scope, but I'm not java-literate
enough to tell what.
My handler, CustomBroadCast class, onCreate, onStart are all at the
same level inside my main activity class (extends activity.)
Can somebody shed some light?
Thanks,
</edg>
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