Can some body please help me in this.I am implementing a swiper application that reads the card details and returns a string.I want to implement a timer that will check whether this string is returned or not.Can somebody please tell me how to find whether a string contains a value after the oncreate method is called.I basically want to know how to check a string contains a value upto a certain time(20 seconds).If no value is retirned upto 20 seconds i will be showing a pop up.I am new to android programming any help would be appreciated.
Following is what i am trying to do in my oncreate method.
Timer timer = new Timer();
TimerTask task = new TimerTask() {
#Override
public void run() {
if(result.length()==0)
{
Log.e("TAG","No value received");
}
}
}
};
timer.schedule(task, 20000,1000);
I suggest using a Handler.
Handler h = new Handler();
h.postDelayed(new Runnable() {
void run() {
// your job to be done in delay seconds
}, delay);
Related
Is there any function in Android that can use to make the activity wait for an interval and continue working?
I mean , for example, I use setContentView() to set a layout , and after 3 seconds it will load another layout, and continue to do another job, I don't need to repeat doing same thing after an interval, just continue do another thing.
Thanks in advanced.
You can Use Following Method to Set Interval
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
// This method will be executed once the timer is over
// Do your code here
}
}, 3000);
Here, 1000 = 1 Second
But Before running this code make sure that you are not in BACKGROUND PROCESS THREAD...otherwise this may cause an error..
Do it at Android Style:
Handler mHandler = new Handler();
mHandler.postDelayed(runnableHandler, 3000);
private Runnable runnableHandler = new Runnable() {
#Override
public void run() {
doSomething()
}
};
private void doSomething() {
// Before do something remove all callbacks from Handler
mHandler.removeCallbacks(runnableHandler);
andFinallyDoWhatYouNeed();
}
I have this method
public void GetSMS(){
//in this method I read SMS in my app inbox,
//If have new SMS create notification
}
for this I think create timer tick method and every 5 sec call GetSMS()
How can I create a correct method for that ?
Here is an example of Timer and Timer Task. Hope this helps.
final Handler handler = new Handler();
Timer timer = new Timer(false);
TimerTask timerTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
#Override
public void run() {
// Do whatever you want
}
});
}
};
timer.schedule(timerTask, 1000); // 1000 = 1 second.
Maybe with a timer and a timertask?
See javadocs:
http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Timer.html
Yet receiving broadcasts is probably a more solid solution.
See: Android - SMS Broadcast receiver
Use Timer.scheduleAtFixedRate() as follow:
final Handler handler = new Handler();
Timer timer = new Timer(false);
TimerTask timerTask = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
#Override
public void run() {
GetSMS();
}
});
}
};
timer.scheduleAtFixedRate(timerTask, 5000, 5000); // every 5 seconds.
I saw it by accident.. This is not the right way to do it..
You don't need to check if there is a sms that received. Android provide broadcast receiver to get notified when sms is income.
Here you go, you have the link here.. Copy paste and it will work great
http://androidexample.com/Incomming_SMS_Broadcast_Receiver_-_Android_Example/index.php?view=article_discription&aid=62&aaid=87
Hope that this make sense
Although the above timer methods are the correct way to use timers of the sort you are after, I quite like this little hack:
new CountDownTimer(Long.MAX_VALUE, 5000)
{
public void onTick(long millisUntilFinished)
{
// do something every 5 seconds...
}
public void onFinish()
{
// finish off when we're all dead !
}
}.start();
Long.MAX_VALUE has, according the Java docs, a (signed) value of 2^63-1, which is around 292471 millennia ! So starting up one of these countdown timers effectively lasts forever relatively speaking. Of course this depends on your interval time. If you want a timer every 1 second the timer would "only" last 58494 millenia, but we don't need to worry about that in the grander scheme of things.
I am using the JSON parser to parse some pages but I would like to recall the parsing function every 30 seconds. How can i do that ?
One of the method to call a method every 30 seconds is by using postDelay of Handler see below code.
Handler handler;
handler=new Handler();
handler.removeCallbacks(run);
handler.post(run);
Runnable run=new Runnable()
{
public void run()
{
parsing();
handler.postDelayed(run,30000);
}
};
Another approach is by using "AlarmManager"
That is a weird need, only parsing when necessary would probably be a lot better.
Anyway, you should have a look at Timers and background services but be sure of what you are doing : if you create a background service that make a network call twice every minute, if that call is costly, you could cost a lot of data and/or battery to your users which is not a good idea.
You can do it using a timer.
Timer myTimer = new Timer();
After that you can call use the schedule method to call your json parser method.
myTimer.schedule(new TimerTask()
{
public void run() {
timerMethod();
}
}, 0, 1000);
private void timerMethod()
{
this.runOnUiThread(doSomething);
}
private Runnable doSomething = new Runnable() {
public void run() {
// Your code for doing something
}
On button click I want to begin a timer of 5 minutes and then execute a method that will check for certain conditions and set off alerts if conditions are right. I've seen examples with timers and postDelay, but don't really understand why one would use one vs another. What is the best way to accomplish what I am trying to do? I don't want to lock up the UI during the 5 minutes. The user should be free to use the app as normal during the countdown.
EDIT: I am trying the postDelayed suggestion but visual studio is not liking something about my code. It looks exactly like examples I've found. My be a mono for android thing.
Handler h = new Handler();
Runnable r = new Runnable(){
public void run()
{
Dialog d = inst2.showBuilder(this, "test", "test");
d.Show();
}
};
h.postDelayed(r, 5000);
Specifically the code block inside of run throws all kinds of "} expected" and "a namespace cannot directly contain members such as fields or methods" exceptions.
Try using Timer Object :
Timer mTimer = new Timer();
mTimer.schedule(new TimerTask()
{
#Override
public void run()
{
// Your code goes here
}
}, 1000); // 1sec
final Handler handler = new Handler();
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
#Override
public void run()
{
handler.post(new Runnable()
{
public void run()
{
// YOUR Code
}
});
}
}, 1000); // 1sec
You can start a simple Thread that will sleep in background for 5 minutes and then call a function. While the thread sleeps in background the UI will not freeze. When the thread finish executing what you want you can set off alerts by sending some intents as notifications and receive them in some Broadcast Receivers.
Hope this helps
Use Handler.postDelayed(Runnable block); method to execute delay, as android also not recommend to use timer.
Handler h = new Handler();
Action myAction = () =>
{
// your code that you want to delay here
};
h.PostDelayed(myAction, 1000);
Every 5 seconds, I want to call my webservice and get text (not images), then display it in my ImageAdapter. What would be the best way to accomplish this?
final Handler handler = new Handler();
final Runnable r = new Runnable()
{
public void run()
{
callWebservice();
}
};
handler.postDelayed(r, 5000);
It depends if you want to use a different thread or not. Do you want the user to be able to interact with the application on the UI Thread while the images are downloading? If so, then I would definitely use an AsyncTask with a small ProgressBar (style="#android:style/Widget.ProgressBar.Small")
If you don't care about threading then what #inazaruk said.
Edit: the truth is most modern apps that retrieve data from a web service will use an AsyncTask with a discreet little loader in the corner just to let the user know it's updating.
Edit 2: here's an example of using a TimerTask to run something every 5 seconds. The key is the runOnUiThread(). There may be better ways to tie all the elements together but this accurately portrays all the pieces.
myTimer = new Timer();
myTimer.schedule(new TimerTask() {
#Override
public void run() {
CallWebService();
}
}, 0, 1000);
}
private void CallWebService()
{
this.runOnUiThread(fetchData);
}
private Runnable fetchData = new Runnable() {
public void run() {
asyncTask.execute();
}
};
You should call asynctask inside the application main thread. Asynctask can't be called in a background thread.