Develop Reference

When the countdowntimer finished i will go next activity?

I have two activity set countdown timer in MainActivity, I want when countdown timer finished it will go next activity.but it's not going to next activity its show timer.
here is my code:
public class MainActivity extends AppCompatActivity {
TextView txtViewDays,txtViewHours,txtViewMinutes,txtViewSecond;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtViewDays = findViewById(R.id.days);
txtViewHours = findViewById(R.id.hours);
txtViewMinutes = findViewById(R.id.minutes);
txtViewSecond = findViewById(R.id.seconds);
start_countdown_timer();
}
private void start_countdown_timer()
{
SimpleDateFormat formatter = new SimpleDateFormat("dd.MM.yyyy, HH:mm:ss");
formatter.setLenient(false);
final long[] startTime = new long[1];
String endTime = "23.06.2019, 22:56:10";
long milliseconds=0;
final CountDownTimer mCountDownTimer;
Date endDate;
try {
endDate = formatter.parse(endTime);
milliseconds = endDate.getTime();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
startTime[0] = System.currentTimeMillis();
mCountDownTimer = new CountDownTimer(milliseconds, 1000) {
#Override
public void onTick(long millisUntilFinished) {
Long serverUptimeSeconds =
(millisUntilFinished - startTime[0]) / 1000;
String daysLeft = String.format("%d", serverUptimeSeconds / 86400);
txtViewDays.setText(daysLeft);
String hoursLeft = String.format("%d", (serverUptimeSeconds % 86400) / 3600);
txtViewHours.setText(hoursLeft);
String minutesLeft = String.format("%d", ((serverUptimeSeconds % 86400) % 3600) / 60);
txtViewMinutes.setText(minutesLeft);
Log.d("minutesLeft",minutesLeft);
String secondsLeft = String.format("%d", ((serverUptimeSeconds % 86400) % 3600) % 60);
txtViewSecond.setText(secondsLeft);
}
#Override
public void onFinish() {
Intent i = new Intent(MainActivity.this,New.class);
startActivity(i);
finish();
}
};
mCountDownTimer.start();
}
}
What can I do?
N.B : code is collected and I also try but I can't.Thank you

With your code you need 1561330519961ms that means several days must pass in order for onFinish method to be called. I tried your code with 1min for the timer instead
milliseconds = endDate.getTime();
and worked just fine. After the timer finished it changed activity.
---edit---
This sample code will run for 6 seconds and then call the onFinish method
milliseconds = 6000
mCountDownTimer = new CountDownTimer(milliseconds, 1000) {
#Override
public void onTick(long millisUntilFinished) {
}
#Override
public void onFinish() {
Intent i = new Intent(MainActivity.this,Myclass.class);
startActivity(i);
finish();
}
};
mCountDownTimer.start();

Android App Crashes with while loop

I'm making this app that tells how much longer till we reach a destination but whenever I try to use it it just black screens just crashes. I think it has something to do with the loop but I can't find anything online Can anyone help? Thanks in advance.................................................................................................................
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.util.Calendar;
import java.util.TimeZone;
import java.time.*;
import java.math.*;
public class TimeTIll extends AppCompatActivity {
private static final String DateUtils = null;
TextView txt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_time_till);
txt = (TextView) findViewById(R.id.TimeDipslay);
int i = 0;
while (i < 10) {
Program();
i++;
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}
public void Program() {
int totalMinutesSinceMidnight = 0;
long ms = 0;
long secondsM = 0;
long SecondsTillEstimate = 0;
long SecondsTillArrival1 = 0;
double MinutesTillArrival = 0;
double hoursTillArrival = 0;
double SecondsTillArrival = 0;
Calendar now = Calendar.getInstance();
Calendar midnight = Calendar.getInstance();
midnight.set(Calendar.HOUR_OF_DAY, 0);
midnight.set(Calendar.MINUTE, 0);
midnight.set(Calendar.SECOND, 0);
midnight.set(Calendar.MILLISECOND, 0);
try {
Thread.sleep(2000);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
now = Calendar.getInstance();
midnight = Calendar.getInstance();
ms = now.getTime().getTime() - midnight.getTime().getTime();
totalMinutesSinceMidnight = (int) (ms / 1000);
secondsM = totalMinutesSinceMidnight;
SecondsTillEstimate = (60 * 60 * 23);
SecondsTillArrival1 = SecondsTillEstimate - secondsM;
hoursTillArrival = Math.floor(SecondsTillArrival1 / 3600);
SecondsTillArrival1 -= (hoursTillArrival * 3600);
MinutesTillArrival = Math.floor(SecondsTillArrival1 / 60);
SecondsTillArrival1 -= (MinutesTillArrival * 60);
SecondsTillArrival = SecondsTillArrival1;
txt.setText((int) hoursTillArrival + " Hours " + (int) MinutesTillArrival + " Minutes " + (int) SecondsTillArrival + " Seconds Till Arrival In Floriada");
}
}

Please read about the activity life-cycle. You cannot call long-running tasks in onCreate and expect them to show anything other than an ANR crash (your onCreate method blocks the UI thread with all those sleep statements and generates an ANR crash before it even gets to the onStart and onResume stages where it actually shows the activity).
If you want the UI to change dynamically, you could use a handler to execute a method at a regular interval. For example, to update something at a regular interval (1000 ms here) you could do:
public class MainActivity extends AppCompatActivity {
private final Handler handler = new Handler();
private TextView txt;
private int count = 0;
private final int updateFreqMs = 1000; // call update every 1000 ms
#Override
protected void onPause() {
super.onPause();
handler.removeCallbacksAndMessages(null);
}
#Override
protected void onResume() {
super.onResume();
handler.postDelayed(new Runnable() {
#Override
public void run() {
updateTime();
handler.postDelayed(this, updateFreqMs);
}
}, updateFreqMs);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_time_till);
txt = findViewById(R.id.TimeDipslay);
}
private void updateTime() {
// here you update the displayed value
// this will be called every second indefinitely
// do your math and generate a string to print, just showing
// a counter here to demonstrate
++count;
txt.setText("Count = " + count);
}
}

I think that the problem is that you are trying to make sleep the main thread of the application. In Android I knew that for security reasons this can't be done.
(Look this https://www.codementor.io/tips/0743378261/non-freezing-sleep-in-android-app for details )
Try this solution instead:
How to pause / sleep thread or process in Android?

You Shouldn`t use it inside main thread specially when you are doing operation inside it.
You may have to use some thing like that.
viewModelScope.launch(Dispatchers.IO) {
while (statues==true){
if (statue==true){
delay(500)
//ToDo
}
}
}

What is my app getting force close? There is some error with the thread. But i'm not able to figure it out? [closed]

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.
Closed 10 years ago.
public class MainActivity extends Activity {
private Button Start, Reset, Stop;
private EditText stop_watch, lblDate, lblTime;
public MainActivity() {
init();
}
private final UpdateClockThread ucThread = new UpdateClockThread();
private final StopwatchThread swThread = new StopwatchThread();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Start = (Button)findViewById(R.id.button1);
Stop = (Button)findViewById(R.id.button3);
Reset = (Button)findViewById(R.id.button2);
stop_watch = (EditText)findViewById(R.id.editText3);
lblTime = (EditText)findViewById(R.id.editText2);
lblDate = (EditText)findViewById(R.id.editText1);
Start.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
startactionPerformed();
}
});
Stop.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
stopactionPerformed();
}
});
Reset.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
resetactionPerformed();
}
});
}
public void init() {
swThread.setDaemon(true);
ucThread.setDaemon(true);
swThread.start();
ucThread.start();
}
/** Listens to the Start/Stop/Resume button. */
void startactionPerformed() {
swThread.go();
//init();
}
void stopactionPerformed() {
swThread.noGo();
}
void resetactionPerformed() {
swThread.reset();
}
/** A thread that updates the current date & time. */
private class UpdateClockThread extends Thread {
/** The actual work of the thread. */
public void run() {
while (true) {
lblTime.setText("ampm");
Calendar now = Calendar.getInstance();
String month = Integer.toString(now.get(Calendar.MONTH)+1);
String date = Integer.toString(now.get(Calendar.DAY_OF_MONTH));
String year = Integer.toString(now.get(Calendar.YEAR));
String hour = Integer.toString(now.get(Calendar.HOUR));
if (hour.equals("0")) hour = "12";
String minute = Integer.toString(now.get(Calendar.MINUTE));
if (minute.length() == 1) minute = "0" + minute;
String second = Integer.toString(now.get(Calendar.SECOND));
if (second.length() == 1) second = "0" + second;
String ampm = now.get(Calendar.AM_PM) == Calendar.AM ? "AM" : "PM";
lblDate.setText(month + "/" + date + "/" + year);
lblTime.setText(hour + ":" + minute + ":" + second + " " + ampm);
try {
sleep(500);
} catch (InterruptedException e) {}
}
}
}
/** A thread that keeps track of the stop watch & updates
* the display accordingly.
*/
class StopwatchThread extends Thread {
/** Whether or not stop watch is running. */
private boolean going = false;
/** Stores elapsed milliseconds of previous runs. */
private long prevElapsed = 0;
/** Stores beginning time of this run. */
private Date startDate = new Date();
/** Returns elapsed time in milliseconds.
*#return The elapsed time
*/
private long elapsedTime() {
return prevElapsed + (going ? new Date().getTime() - startDate.getTime() : 0);
}
/** Changes the number of elapsed milliseconds into a string.
*#param time Number of elapsed milliseconds
*#return The elapsed time as a string.
*/
private String msToString(long time) {
String ms, sec, min;
if (time % 10 >= 5) //round to nearest hundredth
time += 5;
ms = Long.toString(time % 1000);
while (ms.length() < 3)
ms = "0" + ms;
ms = ms.substring(0, ms.length() - 1);
time /= 1000;
sec = Long.toString(time % 60);
if (sec.length() == 1) sec = "0" + sec;
time /= 60;
min = Long.toString(time);
return min + ":" + sec + "." + ms;
}
/** Called when the stop watch is to go.
*/
public void go() {
startDate = new Date();
going = true;
}
/** Called when the stop watch is to stop.
*/
public void noGo() {
prevElapsed = elapsedTime();
going = false;
}
/** Resets the stop watch.
*/
public void reset() {
going = false;
prevElapsed = 0;
}
/** Adds a lap to the list.
*/
/** Main code of the thread.
*/
public void run() {
while (true) {
stop_watch.setText(msToString(elapsedTime()));
yield();
}
}
}
}
What is my app getting force close? There is some error with the thread. But i'm not able to figure it out?

Try make all interaction with UI from threads in runOnUiThread method of Activity http://developer.android.com/reference/android/app/Activity.html#runOnUiThread%28java.lang.Runnable%29
EDIT
private class UpdateClockThread extends Thread {
public void run() {
/* Do somthing expensive */
......
/* Update UI */
MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
/* Do UI update */;
lblTime.setText("ampm");
......
}
});
}
}

You should run adb logcat on your developer machine. Usually if you get a force close a traceback is displayed in the log.

Your class StopwatchThread contains the line:
stop_watch.setText(msToString(elapsedTime()));
This will not work, and neither will the UI updates within UpdateClockThread. This is because you cannot modify the UI from a background thread. Your background thread should either:
send a message to a Handler that has been created on the UI thread, so that the Handler then makes the update to the UI, or
you can pass a runnable into runOnUiThread that performs the UI update.

Adding countdowntime to system time

A bit confusing this one but should make sense.
Thanks to all your help I have my app now showing a custom digital clock and a countdowntimer (02:30:00 countdown) running under it.
How do I add 02:30:00 to the current time so a new clock field shows the current time + the countdown?
Thanks
Dj
This is my digitalclock code where would i put the offset to ad 2 hours 30 mins to time...
#Override
protected void onStart() {
super.onStart();
timer = new Timer("DigitalClock");
Calendar calendar = Calendar.getInstance();
final Runnable updateTask = new Runnable() {
public void run() {
countdown.setText(getCurrentTimeString());
}
};
int msec = 999 - calendar.get(Calendar.MILLISECOND);
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(updateTask);
}
}, msec, 1000);
}
#Override
protected void onStop() {
super.onStop();
timer.cancel();
timer.purge();
timer = null;
}
private String getCurrentTimeString() {
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
// int second = calendar.get(Calendar.SECOND);
return String.format("%02d:%02d", hour, minute);
}

Now that I understand your question :p, I think the only way to do that is to reimplement a DigitalClock. Take its source code and play with it by adding an offset to the hours and minutes.
UPDATE:
What I would do is take that code and change this part:
mTicker = new Runnable() {
public void run() {
if (mTickerStopped) return;
mCalendar.setTimeInMillis(System.currentTimeMillis());
setText(DateFormat.format(mFormat, mCalendar));
invalidate();
long now = SystemClock.uptimeMillis();
long next = now + (1000 - now % 1000);
mHandler.postAtTime(mTicker, next);
}
};
mTicker.run();
Convert 2:30:00 to milliseconds and add it to now :
long now = SystemClock.uptimeMillis() + offset;

Android count down timer in background

I have an Android app with manage a countdowntimer (class CountDownTimer) that it is shown in app screen, to show how much time left to arrive 00:00.
My problem now is that when I press home button or when I launch another app the app/timer does not run in the background. So I suspect I must do a service, but how? Colleagues have said to me that I must do something special for when the device gets locked in order for the timer to continue. I want to wake up when arrived to 0.
What is the best way to do this?

You must create your CountDownTimer class and extend it from Service class.
By doing so your activity becomes a service and it runs in the background even if you close
the application or the screen it doesnt matter it just does the task that you assign to it in the background .

First off, You need to use a Handler to operate the timer, but check out this great post to see if it helps:
How to set a timer in android
Android Developer Resources touch on this topic as well:
http://developer.android.com/resources/articles/timed-ui-updates.html

The easiest way is use the service with timer async. You can download the source from here (Android Countdown Timer Run In Background)
Service Class:
package com.countdowntimerservice;
import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.util.Log;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
public class Timer_Service extends Service {
public static String str_receiver = "com.countdowntimerservice.receiver";
private Handler mHandler = new Handler();
Calendar calendar;
SimpleDateFormat simpleDateFormat;
String strDate;
Date date_current, date_diff;
SharedPreferences mpref;
SharedPreferences.Editor mEditor;
private Timer mTimer = null;
public static final long NOTIFY_INTERVAL = 1000;
Intent intent;
#Nullable
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
mEditor = mpref.edit();
calendar = Calendar.getInstance();
simpleDateFormat = new SimpleDateFormat("HH:mm:ss");
mTimer = new Timer();
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);
intent = new Intent(str_receiver);
}
class TimeDisplayTimerTask extends TimerTask {
#Override
public void run() {
mHandler.post(new Runnable() {
#Override
public void run() {
calendar = Calendar.getInstance();
simpleDateFormat = new SimpleDateFormat("HH:mm:ss");
strDate = simpleDateFormat.format(calendar.getTime());
Log.e("strDate", strDate);
twoDatesBetweenTime();
}
});
}
}
public String twoDatesBetweenTime() {
try {
date_current = simpleDateFormat.parse(strDate);
} catch (Exception e) {
}
try {
date_diff = simpleDateFormat.parse(mpref.getString("data", ""));
} catch (Exception e) {
}
try {
long diff = date_current.getTime() - date_diff.getTime();
int int_hours = Integer.valueOf(mpref.getString("hours", ""));
long int_timer = TimeUnit.HOURS.toMillis(int_hours);
long long_hours = int_timer - diff;
long diffSeconds2 = long_hours / 1000 % 60;
long diffMinutes2 = long_hours / (60 * 1000) % 60;
long diffHours2 = long_hours / (60 * 60 * 1000) % 24;
if (long_hours > 0) {
String str_testing = diffHours2 + ":" + diffMinutes2 + ":" + diffSeconds2;
Log.e("TIME", str_testing);
fn_update(str_testing);
} else {
mEditor.putBoolean("finish", true).commit();
mTimer.cancel();
}
}catch (Exception e){
mTimer.cancel();
mTimer.purge();
}
return "";
}
#Override
public void onDestroy() {
super.onDestroy();
Log.e("Service finish","Finish");
}
private void fn_update(String str_time){
intent.putExtra("time",str_time);
sendBroadcast(intent);
}
}