Develop Reference

How to handle handler again enter into same activity?

I created one handler for calling AsyncTask in background when I start the application its working fine when I re-enter into the application it will call two times in for first one and present one, how can I handle that
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask doAsynchronousTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
try {
checkandsave();
} catch (Exception e) {
// TODO Auto-generated catch block
}
}
});
}
};
timer.schedule(doAsynchronousTask, 0, 300000); //execute in every 60000 ms = 1 minute

TimerTask / Handler with Delay getting called Multiple times

I need a delay for around 5 seconds. I have tried using Timer using below code :
Timer myTimer = new Timer();
myTimer.schedule(new TimerTask() {
#Override
public void run() {
Log.d(TAG,"Timer");
}
}, 4000, 5000);
When i check logs, the Timer is getting printed thrice. If I change time, sometimes it gets printed in log 4 times as well.
I have tried using Handler as well like below :
final Handler mHandler = new Handler();
new Thread(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
while (true) {
try {
Thread.sleep(10000);
mHandler.post(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
Log.d(Utility.TAG,"Sleep::");
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
}
}).start();
But again the log is printing multiple times. I just want to call my method once not multiple times. How can I achieve it ?
EDIT
used handler without thread as well like below :
final Handler h = new Handler();
final int delay = 3000; //milliseconds
h.postDelayed(new Runnable(){
public void run(){
//do something
h.postDelayed(this, delay);
Log.d(Utility.TAG,"Sleep ::");
}
}, delay);
But again, Log is getting printed thrice

Your third approach (no Timer, no Thread) is the closest to being correct. It's printing multiple times because the Runnable is re-posting itself every time it runs. If you only want it to run once, remove this line from the run() method:
h.postDelayed(this, delay);

Timer that run every seconds on android eclipse

Hi every one can you help to create a 5 seconds timer that runs for every 3 or 5 seconds.. im new in android pls help me
i have only created a 5 seconds timer but it only run once.. i want it to run for every 5 seconds..
and here is my code :
txt1 = (TextView)findViewById(R.id.textView1);
final Handler handler = new Handler();
TimerTask task = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
// pos=rand.nextInt(10);
//txt1.setText(""+pos);
if(Integer.parseInt(txt1.getText().toString()) != 0)
{
txt1.setText("" + (Integer.parseInt(txt1.getText().toString()) - 1));
}
}
});
}
};
Timer timer = new Timer();
timer.schedule(task, 1000, 1000);
Thx :)

You can do it using below code, handler calls itself again and again.
final Handler handler = new Handler();
Runnable runable = new Runnable() {
#Override
public void run() {
try{
if(Integer.parseInt(txt1.getText().toString()) != 0)
{
txt1.setText("" + (Integer.parseInt(txt1.getText().toString()) - 1));
}
handler.postDelayed(this, 3000);
}
catch (Exception e) {
// handle exception
}
}
};
handler.postDelayed(runable, 5000);

Why my tracking service freezes when the phone moves?

I have developed a service which includes timer task and runs after every 5 minutes for keeping tracking record of the device, every five minutes it adds a record to the database.
My service is working fine when the phone is not moving i.e it gives records after every 5 minutes as it should be. But i have noticed that when the phone is on move it updates the points after 10 or 20 minutes , i.e whenever the user stops in his way whenever he is on the move.
Do service freezes on the move, if yes! how is whatsapp messenger managing it??
Please help!
i am writing my onstart method. please help
#Override
public void onStart(Intent intent, int startId) {
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
Log.d(TAG, "onStart");
mLocationClient.connect();
final Handler handler_service = new Handler();
timer_service = new Timer();
TimerTask thread_service = new TimerTask() {
#Override
public void run() {
handler_service.post(new Runnable() {
#Override
public void run() {
try {
some function of tracking
}
});
}
};
timer_service.schedule(thread_service, 1000, service_timing);
//sync thread
final Handler handler_sync = new Handler();
timer_sync = new Timer();
TimerTask thread_sync = new TimerTask() {
#Override
public void run() {
handler_sync.post(new Runnable() {
#Override
public void run() {
try {
//connecting to the central server for updation
Connect();
} catch (Exception e) {
// TODO Auto-generated catch block
}
}
});
}
};
timer_sync.schedule(thread_sync,2000, sync_timing);
}

AlarmManager or Service or anything else?

Could anybody help me what is the best method if I need to control some things in Android device each 3 seconds, I think I have only 2 methods, these are AlarmManager or Service, but I read that everlasting Service or AlarmManager is deprecated.
So which method should I use?

You can add a Timer with an Asynctask. Here is a code for it:
//global variables:
Timer timer = new Timer();
final Handler pHandler = new Handler();
//onCreat:
TimerTask task = new TimerTask() {
#Override
public void run() {
pHandler.post(new Runnable() {
#Override
public void run() {
try {
// your code
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
};
timer.schedule(task, 0, 3000);