Essential Books

DatePicker

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DatePicker allows user to pick date. When we create new instance of DatePicker, we can set initial date. If we don’t set initial date, current date will be set by default.

We can show DatePicker to user by using DatePickerDialog or by creating our own layout with DatePicker widget.

Also we can limit range of date, which user can pick.

By setting minimum date in milliseconds 
//In this case user can pick date only from future
datePicker.setMinDate(System.currentTimeMillis());
By setting maximum date in milliseconds 
//In this case user can pick date only, before following week.
datePicker.setMaxDate(System.currentTimeMillis() + TimeUnit.DAYS.toMillis(7));

To receive information, about which date was picked by user, we have to use Listener.

If we are using DatePickerDialog, we can set OnDateSetListener in constructor when we are creating new instance of DatePickerDialog:

Sample use of DatePickerDialog 

public class SampleActivity extends AppCompatActivity implements DatePickerDialog.OnDateSetListener {

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

    private void showDatePicker() {
        //We need calendar to set current date as initial date in DatePickerDialog.
        Calendar calendar = new GregorianCalendar(Locale.getDefault());
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog datePickerDialog = new DatePickerDialog(this, this, year, month, day);
        datePickerDialog.show();
    }

    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {

    }
}

Otherwise, if we are creating our own layout with DatePicker widget, we also have to create our own listener as it was shown in other example

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Dialog:
* Dialog
* Adding Material Design AlertDialog to your app using Appcompat
* A Basic Alert Dialog
* Alert Dialog
* Custom Alert Dialog with EditText
* DatePickerDialog
* DatePicker
* ListView in AlertDialog
* Alert Dialog with Multi-line Title
* Date Picker within DialogFragment
* Fullscreen Custom Dialog with no background and no title
Table Of Contents
0 Getting Started
1 Layouts
2 Gradle
3 RecyclerView onClickListeners
4 NavigationView
5 Intent
6 JSON handling with org.json
7 Android Studio
8 Resources
9 Data Binding Library
10 Exceptions
11 Getting Calculated View Dimensions
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27 Camera 2 API
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32 ADB Android Debug Bridge
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34 Supporting different screen resolutions
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36 Retrofit2
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40 Formatting Strings
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62 Data Synchronization with Sync Adapter
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67 RoboGuice
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70 Volley
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73 Integrate Google Sign In
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88 Text to Speech (TTS)
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154 Displaying Google Ads
155 Vk SDK
156 Localized DateTime
157 Count Down Timer
158 Reading Barcode and QR codes
159 Otto Event Bus
160 TransitionDrawable
161 Port Mapping using Cling
162 Creating Overlay always-on-top Windows
163 ExoPlayer
164 Inter-app UI testing with UIAutomator
165 MediaSession
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197 Check Data Connection
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203 Strick Mode Policy
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251 Enhancing Alert Dialogs
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254 Looper
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256 Google Drive API
257 Animated AlertDialog Box
258 Annotation Processor
259 SyncAdapter with periodically do sync of data
260 Singleton Class for Toast Message
261 Fastjson
262 Android Architecture Components
263 Jackson
264 Play Store
265 Loading Bitmaps Effectively
266 Getting system font names
267 Smartcard
268 Convert vietnamese string to english
269 Contributors