What is chronometer in android

Chronometer in Android

Post author:Sagar Paliwal
Post published: August 11, 2021
Post category:Android Development
Post comments:0 Comments

The Android Chronometer is a timer that can be used to count time starting at a certain point. The Android Chronometer can be used to count time in both direction(upward or downward). It is a TextView subclass that displays the count in TextView.

Chronometer is an Android class that implements a simple timer. Chronometer is TextView’s Subclass . This class help us in adding a timer into our app. You can specify a start time in the elapsedRealTime() timebase for the Timer to begin counting from.

Chronometer code in xml :

Working of chronometer

T he start method is used to start the chronometer. Before the chronometer can begin counting, you must first set the starting point of time by calling the setBase method and giving the starting point of time. Because Chronometer’s default base time is the time at which the start method is called, it starts counting from 0 by default if you don’t set base.

Even if you use SystemClock.elapsedRealtime() as the base, counting will begin at 0. This is how Chronometer determines its default base.

To stop the chronometer, use the stop method. The start and stop methods do not change the base , they simply start and stop the display of the count in the text view. That is, once started, the Chronometer never stops counting. However, you can reset the base by invoking setBase with a new starting point.

The chronometer timer displays time in “MM:SS” or “H:MM:SS” by defaultyou can change this by using the setFormat method.

Android Chronometer upward Countdown or Downward Countdown

By default, the chronometer counts upward. If you want to have a countdown chronometer, call the setCountDown method and pass true as the value. This function is useful for counting down from a future time. Assume you want to start counting down from tomorrow in your app. Then, first, set setCountDown to true and base to SystemClock. 10006060*24 = elapsedRealtime() + one day’s time in milliseconds

I’ll use an example to demonstrate how to use Android Chronometer :

The code given below is an example of chronometer stopwatch which displays chronometer and three buttons . First button will be displayed as START button and second button as PAUSE button ,third button as RESET button . Once Start button is clicked, chronometer will start counting from current time displaying time in seconds. On clicking PAUSE button, count will pause. On clicking the RESET button, base will be reset to current time again to start a new count. In this we have implemented an Event listener ( OnChronometerTickListener<> ) which will reset the Chronometer after every seven seconds.

Step 1: Create a new project in Android studio.

Step 2 : activity_main.xml--> activity_main.xml contain Chronometer and three buttons for start and pause, reset operation.

Step 3: In MainActivity.kt initialize variable and implement Chronometer and functions for buttons .

We hope that this guide will assist you in quickly creating a Chronometer in Android . If you have any problems, please post them in the comments section, we will gladly assist you.
The official document of Chronometer.

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Источник

What is chronometer in android

But don’t worry, here you will find almost everything you need to know about timer and the answer of this most famous question «How to show timer in Android ?» There are several examples on internet but most of them are not clear to so many developers. That’s why we decided to make a good, clean and simple blog on this topic.

So here we will start with chronometer. So basically chronometer is the best option for showing timer because the most main reason is supporting API 1+, which is quite impressive rather than TextClock, which supports API 17+.

Step : 1

So, First of all copy this xml code and paste into you layout. You can customize it by using attributes like textSize, textColor etc.

Step : 2

Now, initiate chronometer in your java file (Activity/Fragment).

Now chronometer is so simple, it starts tickling from base time and does increment by 1 sec. and one more thing which is important that you can start it by chronometer.start() and stop by using chronometer.stop().

Note : If you start chronometer without giving any base time, it will take the time when you called start() function.

So here are two kind of requirements :
1. Timer should start from 00:00 every time when activity/fragment loads.
2. Timer should be persistence once started.

Now if you want to start from 00:00 every time when activity/fragment loads then use SystemClock.elapsedRealtime() as base time of chronometer.

This one is the best for the requirement number 1. But if we talk about persistence timer with chronometer the logic comes into the play.

So Now we need to save two things here.
1. Start Date Time.
2. Current Date Time

You can also save it on server (because if user changes device time, it won’t affect the timer).
Paste the code below in your code to make persistent timer.

Preview of Chronometer

That’s all Folks, if you still have any confusion, clear them by commenting below.
And Be Updated with our YouTube Channel.

Источник

Tutorialwing

Hello Readers! In this post, we are going to learn about how to use android chronoMeter widget in any android application. We will also go through different attributes of chronoMeter widget that can be used to customise it.

Output

Tutorialwing Android ChronoMeter Output

Getting Started

ChronoMeter widget can be defined as below –

ChronoMeter is a widget that are used as simple timer. You can give it a start time and it will start counting up from there, or if you don’t provide a base time, it will use the time at which you will call start() method. The timer also counts down from a base time. If you want to count down, you need to call setCountDown(boolean) method with true value.

Some of the popular attributes of android ChronoMeter widget are –

Sr.	XML Attributes	Description
1	android:countDown	Specifies whether this chronometer will count up or count down from the base value
2	android:format	Specifies the format of the string to be shown

Some of the popular attributes of android chronoMeter inherited from TextView are –

Sr.	XML Attributes	Description
1	android:gravity	Specifies gravity of the view
2	android:height	Specifies height of the view
3	android:maxHeight	Specifies maximum height of the view
4	android:maxLength	Set an input filter to constrain the text length to the specified number
5	android:maxWidth	Specifies maximum width of the view
6	android:minHeight	Specifies minimum height of the view
7	android:minWidth	Specifies minimum width of the view
8	android:width	Specifies width of the view

Some of the popular attributes of android chronoMeter inherited from View are –

Sr.	XML Attributes	Description
1	android:alpha	Specifies alpha of the view
2	android:background	Specifies drawable of the background of the view
3	android:elevation	Specifies elevation of the view
4	android:id	Specifies id of the view
5	android:padding	Specifies padding to apply the edges of the view
6	android:visibility	Specifies visibility(VISIBLE, INVISIBLE or GONE) of the view

At first, we will create android application. Then, we will use chronoMeter widget in this application.

1. Creating New Project

Follow steps below to create new project. Please ignore the steps if you have already created a new application.

Step	Description
1.	Open Android Studio.
2.	Go to File => New => New Project. Write application name as ChronoMeter. Then, click next button.
3.	Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
4.	Then, select Empty Activity => click next => click finish.
5.	If you have followed above process correctly, you will get a newly created project successfully. However, you can also visit post to create a new project to know steps in detail.

Now, we will modify xml and java file to use chronoMeter widget in the application.

2. Modify Values folder

Open res/values/strings.xml file. Then, add below code into it.

Open res/layout/activity_main.xml file. Then, add below code into it.

In activity_main.xml file, we have defined chronoMeter and button widgets. Now, we will access these widgets in java file to perform some operations on it.

Open src/main/java/com.tutorialwing.chronometer/MainActivity.java file. Then, add below code into it.

In MainActivity.kt file, we have accessed chronoMeter and button widgets. Then, we have set a click listener to stop/start chronoMeter. A toast message will also be shown that represents the whether chronoMeter is playing or stopped.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.

AndroidManifest.xml

Code inside src/main/AndroidManifest.xml file is as below –

When we run the program, we will get output as shown above.

That’s end of tutorial on Android ChronoMeter Widget.

Источник

Tutorialwing

In this article, we will learn about android ChronoMeter using Kotlin. We will go through various example that demonstrates how to use different attributes of ChronoMeter. For example,

In this article, we will get answer to questions like –

What is ChronoMeter?
Why should we consider ChronoMeter while designing ui for any app?
What are possibilities using ChronoMeter while designing ui? etc.

Let’s have a quick demo of things we want to cover in this tutorial –

Output

Tutorialwing Kotlin ChronoMeter Output

Getting Started

We can define android ChronoMeter widget as below –

ChronoMeter is simple widget that can be used as simple timer. You can count up or down with a given base time using chronoMeter. If you do not provide a base time, it will assume base time as time at which you call start() method.

Now, how do we use ChronoMeter in android application ?

Creating New Project

At first, we will create an application.
So, follow steps below to create any android project in Kotlin –

Step	Description
1.	Open Android Studio (Ignore if already done).
2.	Go to File => New => New Project. This will open a new window. Then, under Phone and Tablet section, select Empty Activity. Then, click Next.
3.	In next screen, select project name as ChronoMeter. Then, fill other required details.
4.	Then, clicking on Finish button creates new project.

Some very important concepts (Recommended to learn before you move ahead)

Before we move ahead, we need to setup for viewBinding to access Android ChronoMeter Using Kotlin file without using findViewById() method.

Setup ViewBinding

Add viewBinding true in app/build.gradle file.

Now, set content in activity using view binding.
Open MainActivity.kt file and write below code in it.

Now, we can access view in Kotlin file without using findViewById() method.

Using ChronoMeter in Kotlin

Follow steps below to use ChronoMeter in newly created project –

Open res/values/strings.xml file. Then, add below code into it.
Open res/layout/activity_main.xml file. Then, add below code in it –
We can also access it in Kotlin File, MainActivity.kt, as below –

We have accessed button and chronoMeter using kotlin file (i.e. MainActivity.kt file) in the application. Then, we have set a click listener to play/pause chronoMeter. We are also showing message, as toast message, that represents the current status of the chronoMeter.

Now, run the application. We will get output as below –

Tutorialwing Kotlin ChronoMeter Output

Different Attributes of ChronoMeter in XML

Now, we will see how to use different attributes of Android ChronoMeter using Kotlin to customise it –

Set Id of ChronoMeter

Many a time, we need id of View to access it in kotlin file or create ui relative to that view in xml file. So, we can set id of ChronoMeter using android:id attribute like below –

Here, we have set id of ChronoMeter as chronoMeter_ID using android:id=”” attribute. So, if we need to reference this ChronoMeter, we need to use this id – chronoMeter_ID.
Learn to Set ID of ChronoMeter Dynamically

Set Width of ChronoMeter

We use android:layout_width=”” attribute to set width of ChronoMeter.
We can do it as below –

Width can be either “MATCH_PARENT” or “WRAP_CONTENT” or any fixed value (like 20dp, 30dp etc.).
Learn to Set Width of ChronoMeter Dynamically

Set Height of ChronoMeter

We use android:layout_height=”” attribute to set height of ChronoMeter.
We can do it as below –

Height can be either “MATCH_PARENT” or “WRAP_CONTENT” or any fixed value.
Learn to Set Height of ChronoMeter Dynamically

Set Padding of ChronoMeter

We use android:padding=”” attribute to set padding of ChronoMeter.
We can do it as below –

Here, we have set padding of 10dp in ChronoMeter using android:padding=”” attribute.
Learn to Set Padding of ChronoMeter Dynamically

Set Margin of ChronoMeter

We use android:layout_margin=”” attribute to set margin of ChronoMeter.
We can do it as below –

Here, we have set margin of 10dp in ChronoMeter using android:layout_margin=”” attribute.
Learn to Set Margin of ChronoMeter Dynamically

Set Background of ChronoMeter

We use android:background=”” attribute to set background of ChronoMeter.
We can do it as below –

Here, we have set background of color #ff0000 in ChronoMeter using android:background=”” attribute.
Learn to Set Background of ChronoMeter Dynamically

Set Visibility of ChronoMeter

We use android:visibility=”” attribute to set visibility of ChronoMeter.
We can do it as below –

Here, we have set visibility of ChronoMeter using android:visiblity=”” attribute. Visibility can be of three types – gone, visible and invisible
Learn to Set Visibility of ChronoMeter Dynamically

Set Text of ChronoMeter

We use android:text=”” attribute to set text of ChronoMeter.
We can do it as below –

Here, we have set text (“Hello Tutorialwing”) in ChronoMeter using android:text=”” attribute.
Similarly, we can set any text using this attribute.
Learn to Set Text of ChronoMeter Dynamically

Set Color of Text in ChronoMeter

We use android:textColor=”” attribute to set color of text in ChronoMeter.
We can do it as below –

Here, we have set color (#ffffff i.e. white) of text (“Hello Tutorialwing”) in ChronoMeter using android:textColor=”” attribute. Similarly, we can set any color using this attribute.
Learn to Set Color of ChronoMeter Dynamically

Set Gravity of ChronoMeter

We use android:gravity=”” attribute to set gravity of text in ChronoMeter.
We can do it as below –

Here, we have set gravity of text in ChronoMeter using android:gravity=”” attribute. Attribute value can be – “center_horizontal”, “center”, “center_vertical” etc.
Learn to Set Gravity of ChronoMeter Dynamically

Set Text in Uppercase, Lowercase

If we need to show text of ChronoMeter in uppercase or lowercase etc.

Set text in uppercase

We can use android:textAllCaps=”true” attribute to set text in uppercase. We can do it as below –

Attribute android:textAllCaps=”true” sets text in uppercase. So, HELLO TUTORIALWING is set in ChronoMeter.

By default, false is set in this attribute. So, Whatever value is written in android:text=”” attribute, it will be set as it is. For example,

Above code will set Hello Tutorialwing to ChronoMeter.

How do we set text in lowercase?

In xml file – write all the text in lowercase.
In kotlin file – take text as string. Then, convert it in lowercase. Then, set it to ChronoMeter.

Set Size of Text in ChronoMeter

We use android:textSize=”” attribute to set size of text in ChronoMeter.
We can do it as below –

Here, we have set size of text in ChronoMeter using android:textSize=”” attribute.
Learn to Set Size of Text of ChronoMeter Dynamically

Set Style (Bold/italic) of Text in ChronoMeter

We use android:textStyle=”” attribute to set style (bold, italic etc.) of text in ChronoMeter.
We can do it as below –

Here, we have set style of text in ChronoMeter using android:textStyle=”” attribute. This attribute can take bold, italic or normal.
Learn to Set Style of Text of ChronoMeter Dynamically

Set Letter Spacing of Text in ChronoMeter

We use android:letterSpacing=”” attribute to set spacing between letters of text in ChronoMeter.
We can do it as below –

Here, we have set spacing between letters of text in ChronoMeter using android:letterSpacing=”” attribute.
Learn to Set Letter Spacing of Text of ChronoMeter Dynamically

Set Typeface of Text in ChronoMeter

We use android:typeface=”” attribute to set typeface in ChronoMeter.
We can do it as below –

Here, we have set typeface of text in ChronoMeter using android:typeface=”” attribute. This attribute can take values – “sans”, “normal”, “monospace” or “normal”.
Learn to Set Typeface of ChronoMeter Dynamically

Set fontFamily of Text in ChronoMeter

We use android:fontFamily=”” attribute to set fontFamily of text in ChronoMeter.
We can do it as below –

Here, we have set fontFamily (Here, sans-serif) of text in ChronoMeter using android:fontFamily=”sans-serif” attribute.

Till now, we have see how to use android ChronoMeter using Kotlin. We have also gone through different attributes of ChronoMeter to perform certain task. Let’s have a look at list of such attributes and it’s related task.

Different Attributes of Android ChronoMeter Widget

Below are the various attributes that are used to customise android ChronoMeter Widget. However, you can check the complete list of attributes of ChronoMeter in it’s official documentation site. Here, we are going to list some of the important attributes of this widget –

Some of the popular attributes of android ChronoMeter widget are –

Sr.	XML Attributes	Description
1	android:countDown	Defines whether this chronometer will count up or count down from the base value
2	android:format	Defines the format of the string to be shown

Some of the popular attributes of android chronoMeter inherited from TextView are –

Sr.	XML Attributes	Description
1	android:gravity	Defines gravity of the view
2	android:height	Defines height of the view
3	android:maxHeight	Defines maximum height of the view
4	android:maxLength	Set an input filter to constrain the text length to the specified number
5	android:maxWidth	Defines maximum width of the view
6	android:minHeight	Defines minimum height of the view
7	android:minWidth	Defines minimum width of the view
8	android:width	Defines width of the view

Some of the popular attributes of android chronoMeter inherited from View are –

Sr.	XML Attributes	Description
1	android:alpha	Defines alpha of the view
2	android:background	Defines drawable of the background of the view
3	android:elevation	Defines elevation of the view
4	android:id	Defines id of the view
5	android:padding	Defines padding to apply the edges of the view
6	android:visibility	Defines visibility(VISIBLE, INVISIBLE or GONE) of the view

We have seen different attributes of ChronoMeter and how to use it. If you wish to visit post to learn more about it

Thus, we have seen what is ChronoMeter, how can we use android ChronoMeter using Kotlin ? etc. We also went through different attributes of android ChronoMeter.

Источник

What is chronometer in android

Chronometer

Основные методы:

Обратный отсчёт

Последний отсчёт

What is chronometer in android

Chronometer in Android

Chronometer code in xml :

Working of chronometer

Android Chronometer upward Countdown or Downward Countdown

What is chronometer in android

Step : 1

Step : 2

Tutorialwing

Output

Getting Started

Attributes of Android ChronoMeter Widget

Example of Android ChronoMeter Widget

1. Creating New Project

2. Modify Values folder

3. Use ChronoMeter Widget in xml file

4. Access ChronoMeter Widget in java file

AndroidManifest.xml

Tutorialwing

Output

Getting Started

Creating New Project

Setup ViewBinding

Using ChronoMeter in Kotlin

Different Attributes of ChronoMeter in XML

Set Id of ChronoMeter

Set Width of ChronoMeter

Set Height of ChronoMeter

Set Padding of ChronoMeter

Set Margin of ChronoMeter

Set Background of ChronoMeter

Set Visibility of ChronoMeter

Set Text of ChronoMeter

Set Color of Text in ChronoMeter

Set Gravity of ChronoMeter

Set Text in Uppercase, Lowercase

Set text in uppercase

How do we set text in lowercase?

Set Size of Text in ChronoMeter

Set Style (Bold/italic) of Text in ChronoMeter

Set Letter Spacing of Text in ChronoMeter

Set Typeface of Text in ChronoMeter

Set fontFamily of Text in ChronoMeter

Different Attributes of Android ChronoMeter Widget