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Introduction
To help provide a great user experience, Android provides ready-made dialogs to choose date or time. These dialogs are called pickers and allow users to choose each part of the date, hiding away the complexities associates with time zone and user locale.
Picker Basics
The time picker allows the user to choose the hour, minute, and whether it is AM or PM. The date picker allows the user to choose day, month, and year.
To help with lifecycle management, it is recommended to use DialogFragment class to host the picker controls.
To use pickers with DialogFragment, we need to:
- Define a fragment class that inherits from DialogFragment and returns a TimePickerDialog or DatePickerDialog on the onCreateDialog method call of the fragment.
- Implement the TimePickerDialog.OnTimeSetListener/DatePickerDialog.OnDateSetListener interface that is triggered when the user sets the time.
Let us create a simple Android application that demonstrates this.
Hands On
Fire up Android Studio and start a new Android Studio project.
Figure 1: Starting a new Android Studio project
Provide PickerControlsDemo as the Application Name and click Next.
Figure 2: Naming the application
On the next screen, leave the default values and click Next.
Figure 3: Leaving the default values in place
On the “Add an activity to Mobile” page, choose “Blank Activity”. This creates an application with a single activity.
Figure 4: Adding a Blank Activity
We then are prompted to customize the activity. We will leave the default values unchanged.
Figure 5: Again, leaving the default values in place
Click Finish to create the project files.
Right-click the Java node in the project explorer and select New -> Java class. Enter TimePicker and click OK,
Figure 6: Entering “TimePickerFrag”
The default implementation is shown below:
package com.example.vipul.pickercontrolsdemo;
/**
* Created by vipul on 11/30/2015.
*/
public class TimePickerFrag {
}
We will now update this, as follows.
public class TimePickerFrag extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
Next, we implement the onCreateDialog method and onTimeSet methods.
//timepickerfrag.java
package com.example.vipul.pickercontrolsdemo;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;
import android.text.format.DateFormat;
import android.widget.TimePicker;
import java.util.Calendar;
/**
* Created by vipul on 11/30/2015.
*/
public class TimePickerFrag extends DialogFragment
implements TimePickerDialog.OnTimeSetListener {
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar calendar = Calendar.getInstance();
int hh = calendar.get(Calendar.HOUR_OF_DAY);
int mm = calendar.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), this, hh, mm,
DateFormat.is24HourFormat(getActivity()));
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
// do something
}
}
Similarly, we implement the DialogFragment for Date Picker. Add another Java class, called DatePickerFrag, to the project.
//DatepickerFrag.java
package com.example.vipul.pickercontrolsdemo;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;
import android.widget.DatePicker;
import java.util.Calendar;
/**
* Created by vipul on 11/30/2015.
*/
public class DatePickerFrag extends DialogFragment
implements DatePickerDialog.OnDateSetListener {
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar calendar = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
return new DatePickerDialog(getActivity(),
this, yy, mm, dd);
}
@Override
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
}
}
Lastly, we add two buttons to MainActivity.xml and wire up the click events to instantiate the dialogs.
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView android_text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Time Picker"
android:id="@+id/buttonTimePicker"
android:layout_below="@+id/textView"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:onClick="onButtonTimePickerClick" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Date Picker"
android:id="@+id/buttonDatePicker"
android:layout_centerVertical="true"
android:layout_alignRight="@+id/buttonTimePicker"
android:layout_alignEnd="@+id/buttonTimePicker" />
</RelativeLayout>
In MainActivity.java, we implement the click event handlers.
public void onButtonTimePickerClick(View view){
android.support.v4.app.DialogFragment timepickerFrag =
new TimePickerFrag();
timepickerFrag.show(getSupportFragmentManager(),
"mytimepicker");
}
public void onButtonDatePickerClick(View view){
android.support.v4.app.DialogFragment datepickerFrag =
new DatePickerFrag();
datepickerFrag.show(getSupportFragmentManager(),
"mydatepicker");
}
Our application is now complete. When we launch the application and click the buttons, we can see the pickers in action.
Figure 7: Time Picker
Figure 8: Date picker
Summary
In this article, we learned how to work with the Android picker control. I hope you have found this information useful.
About the Author
Vipul Patel is a technology geek based in Seattle. He can be reached at vipul.patel@hotmail.com. You can visit his LinkedIn profile at https://www.linkedin.com/pub/vipul-patel/6/675/508.
