Develop Reference

a good way to check if timer already run repeatedly

I'm working on React Native and i want to create a never ending service that run every (n) seconds on Native Modules (on this topic is android).
I've create a simple service like this
public void startTimer() {
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
public void run() {
Log.v(TAG, "SERVICE RUN");
try{
if(haveNetworkConnection()){
db.openDB();
if(db.countRowNewStructure()>0){
//send data to server
} else{
Log.v(TAG, "No data should be send to server");
}
} else {
Log.v(TAG, "Ga ada sinyal");
}
} catch (JSONException e){
e.printStackTrace();
}
}
}, 0, 1000);
}
above code run every second to check, but i'm facing the problem when i re-run the service from React Native, the log showing me those code every 0.5 seconds
the simulation may be like :
0----------------1 //seconds
startTimer()
re-run startTimer() conscious
0----------------1 //seconds
startTimer()
//now i have two startTimer() that will run every 1 sec on different interval
I want to keep my startTimer() just running once even I trigger startService() every 0.5 sec.
how can i do that? is it possible?

this may help you. Timmer to perform the certain action in android after the particular time.
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask timertaskforsynctime = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
#Override
public void run() {
// your action here
}
});
}
};
timer.schedule(timertaskforsynctime,5000,10000);// decide the time when it will start and after how much time it will run continusly.
}`
for one time
new Handler().postDelayed(new Runnable(){
#Override
public void run() {
// your code that will run after 1 sec
}
}, 1000);

You could make use of the cancel method to cancel the previous Timer.
public class YourModule extends ReactContextBaseJavaModule {
Timer tim = new Timer();
public void startTimer() {
tim.cancel();
tim = new Timer();
tim.scheduleAtFixedRate(
new TimerTask() {
public void run() {
// Run tasks
}
},
0,
1000);
}
}

Android Create an activity with no buttons

I am very confused as to why I cannot get this to work. I want to have a screen with no buttons run for 5 seconds while I do some things in the background, then navigate back to another screen. Is this not possible?
I have tried to put the code to run the background items in onCreate, onStart, and onResume, and all of these methods are fired before the screen actually displays. Is there another way to do this?
Edit The most recent version of my code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sync);
}
protected void onResume(){
super.onResume();
commitSync();
}
private void commitSync(){
TextView monthDayYear = (TextView)findViewById(R.id.month_day_year);
TextView hourMinuteSecond = (TextView)findViewById(R.id.hour_minute_second);
_application = (App)getApplicationContext();
try {
CountDownLatch latch = new CountDownLatch(1);
latch.await(5, TimeUnit.SECONDS);
//Ensure that we have flash
if(getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH)) {
Camera androidCamera = Camera.open();
Camera.Parameters p = androidCamera.getParameters();
p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
androidCamera.setParameters(p);
//Flash and then turn off
androidCamera.startPreview();
latch.await(50, TimeUnit.MILLISECONDS);
androidCamera.stopPreview();
//Flash screen white
//Get date and time
Module syncModule = _application.getModule();
syncModule.start();
Calendar syncTime = syncModule.getDateAndTime();
//http://stackoverflow.com/questions/21988004/get-time-in-hhmmss-from-seconds-in-java
monthDayYear.setText(new SimpleDateFormat("MM/dd/yyyy").format(syncTime.getTime()));
hourMinuteSecond.setText(new SimpleDateFormat("HH:mm:ss:00").format(syncTime.getTime()));
//Navigate back to MainActivity
Intent mainActivityIntent = new Intent(SyncActivity.this, MainActivity.class);
startActivityForResult(mainActivityIntent, 1);
} else {
throw new Exception("Cannot access Android Flash");
}
} catch (Exception ex) {
Util.appendLog("Exception occured in Sync: " + ex.getMessage());
}
}

Maybe this help you:
Handler handler = new Handler();
handler.postDelayed(new Runnable()
{
#Override
public void run() {
// Do some work like:
finish();
}
}, 500);
This run a code after some delay and you can put this code in your desired screen.

Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
//The code you want to execute
}
}, timeUntilExecution);
This code should execute that run() method after the timeUntilExecution variable (in milliseconds) you could use this to execute what you want to do after the delay. Hope this helps.

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);
}

Trying to get a CountDownTimer to restart after 15 seconds.

I'm doing an app that displays various yoga poses for 60 seconds. I've been pulling my hair out trying to get a countdown timer to work the way I want. I need the timer to be able to pause, and restart automatically after 15 seconds. The CountDownTimer from Android didn't work because it had no pause. I tried 2 different versions of rewritten Android CountDownTimers and the classic version (Android CountDownTimer) and they all seem to have the same bug because they are using Handlers.
I've tried this version: http://www.java2s.com/Open-Source/Android/Timer/multitimer-android/com/cycleindex/multitimer/CountDownTimerWithPause.java.htm
I've tried this version: Android: CountDownTimer skips last onTick()! - I added an onFinish method to it.
I'm trying to do a Thread.sleep in the onFinish method for 15 seconds, and it is not updating the UI past the last second before moving into the Thread.sleep mode. In the following code, the TextView isn't getting updated to be set to empty string until after the Thread.sleep call.
cdt = new CountDownTimerWithPause(60000,1000,true) {
#Override
public void onTick(long millisUntiFinished) {
tvClock.setText("Remaining:" + millisUntiFinished/1000);
}
#Override
public void onFinish() {
tvClock.setText("");
bell.start();
if (bAutoPlayIsOn) {
tvClock.setText("waiting for next pose...");
try {
//15 second pauses between poses
Thread.sleep(15000);
//start over
listener.onForwardItemSelected();
ResetClocktoMaxTime(60000);
resume();
} catch (InterruptedException e) {
Log.d("Sleep Interrupted", e.toString());
e.printStackTrace();
}
catch (Exception e) {
Log.d("Timer", e.toString());
}
}
else {
tvClock.setText("Done");
btnStart.setText("Start ");
bClockIsTicking = false;
btnStart.setCompoundDrawablesWithIntrinsicBounds(null, playBtn, null, null);
}
}
};
Anyone have any ideas how to do this (restart after 15 seconds) differently?

The onFinish method is being called from the interface thread, so any interface changes you make won't actually redraw until onFinish returns. Try something like this:
cdt = new CountDownTimerWithPause(60000,1000,true) {
#Override
public void onTick(long millisUntiFinished) {
tvClock.setText("Remaining:" + millisUntiFinished/1000);
}
#Override
public void onFinish() {
tvClock.setText("");
bell.start();
if (bAutoPlayIsOn) {
tvClock.setText("waiting for next pose...");
(
new Thread() {
public void run() {
try {
//15 second pauses between poses
Thread.sleep(15000);
getActivity().runOnUiThread
(
new Runnable() {
public void run() {
//start over
listener.onForwardItemSelected();
ResetClocktoMaxTime(60000);
resume();
}
}
);
}
catch (InterruptedException e) {
Log.d("Sleep Interrupted", e.toString());
e.printStackTrace();
}
catch (Exception e) {
Log.d("Timer", e.toString());
}
}
}
).start();
}
else {
tvClock.setText("Done");
btnStart.setText("Start ");
bClockIsTicking = false;
btnStart.setCompoundDrawablesWithIntrinsicBounds(null, playBtn, null, null);
}
}
};

Reducing time of app start up in Android

I have prepared one app.
My app have splash screen with drawable animation.When app start up showing white screen(1 or 2 sec) and showing my splash animation. Some time animation not completed it is move to next screen.I think I have done some mistake my code is,
splashAnimation = (AnimationDrawable) imgAnim.getBackground();
imgAnim.post(new Runnable()
{
public void run()
{
if ( splashAnimation != null )
splashAnimation.start();
}
});
System.out.println("----------"+splashAnimation.getNumberOfFrames());
for(int i = 0; i< splashAnimation.getNumberOfFrames();i++)
{
totalDuration += splashAnimation.getDuration(i);
}
Timer timer = new Timer();
TimerTask timerTask = new TimerTask()
{
#Override
public void run()
{
splashAnimation.stop();
Message msg = new Message();
msg.arg1 = 1;
uiHandler.sendMessageDelayed(msg, Constants.ZOOM_ANIM_DELAY);
//zoomAnimation();
}
};
timer.schedule(timerTask, totalDuration);
How to reduce time of app start up?