Stop Watch Example

This example will show how to use chronometer to include stopwatch functionality in your app.

Algorithm:

1.) Create a new project by File-> New -> Android Project name it StopWatch.

2.) You will see some default code into your main.xml, strings.xml and android manifest file.

3.) Now add 1 buttons into your main.xml or write following into main.xml file:

android:gravity="center_horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

android:format="@string/chronometer_initial_format"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:paddingBottom="30dip"
android:paddingTop="30dip"
/>

<button> android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start">

</button>

<button> android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Stop">
</button>

<button> android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Reset">
</button>

4.) Your launcher activity StopWatch will have one default functions OnCreate().

5.) Write following into strings.xml.

<!--?xml version="1.0" encoding="utf-8"?-->

Hello World, StopWatch!
StopWatch
Initial format:%

Steps:

1.) Create a project named StopWatch and set the information as stated in the image.

Build Target: Android 1.6
Application Name: StopWatch
Package Name: com.example. StopWatch
Activity Name: StopWatch
Min SDK Version: 4

2.) Open StopWatch.java file and write following code there:

package com.example.StopWatch;
import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;

public class StopWatch extends Activity {
Chronometer mChronometer;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button button;

mChronometer = (Chronometer) findViewById(R.id.chronometer);

// Watch for button clicks.
button = (Button) findViewById(R.id.start);
button.setOnClickListener(mStartListener);

button = (Button) findViewById(R.id.stop);
button.setOnClickListener(mStopListener);

button = (Button) findViewById(R.id.reset);
button.setOnClickListener(mResetListener);

}

View.OnClickListener mStartListener = new OnClickListener() {
public void onClick(View v) {
mChronometer.start();
}
};

View.OnClickListener mStopListener = new OnClickListener() {
public void onClick(View v) {
mChronometer.stop();
}
};

View.OnClickListener mResetListener = new OnClickListener() {
public void onClick(View v) {
mChronometer.setBase(SystemClock.elapsedRealtime());
}
};
}

3.) Compile and build the project.

4.) Run on 1.6 simulator for the output.

Leave a Comment:

12 comments

Raghvendra Kr. Tiwari says November 4, 2011

thanks..sir.

Amit Hooda says November 7, 2011

stop is not working,,,,even though i click on stop and after sometime when i start it then the time it shows is the total time from the start the pause is not considered at all,,,