Update Time And Date Using Button in Android

Introduction

In this article, I explain the time and date classes in Android, how to use the Date and Time Classes in Android and how to work with these classes. You can easily understand it using the following instructions.

Step 1

As usual, create a new project file as in the following.

Step 2

Open the "activity_main.xml" file and update it with the following code:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="@string/update_btn" />
</RelativeLayout>

Step 3

Open the "MainActivity.java" file and update it with the following code:

package com.example.androidthirdapp;
import java.util.Date;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button btn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button1);
//Onclick listener
btn.setOnClickListener(new View.OnClickListener() {
//Onclick method
public void onClick(View v) {
//Call updateTime() when button is clicked
updateTime();
}
});
}
//Method definition starts here with no return type
public void updateTime() {
//Setting button text with current time
//java.util.Date() method is used to get the current time
btn.setText(new Date().toString());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

Step 4

Now create a new Java file named "CurrentTimeActivity.java" and use the following code in it:

package com.example.androidthirdapp;
import java.util.Date;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class CurrentTimeActivity extends Activity {
Button btn;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button1);
updateTime();
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
updateTime();
}
});
}
//Method definition starts here with no return type
public void updateTime() {
//Setting button text with current time
//java.util.Date() method is used to get the current time
btn.setText(new Date().toString());
}
}

Step 5

Open the "AndroidManifest.xml" file and update it with the following code:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidthirdapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.androidthirdapp.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Step 6

See the output.

Update Button

Current Time