Date library android

Public constructors

An adaptation of the JSR backport for Android. Otherwise usage is the exact same as the ThreeTenBP library and you should consult its website It is a full replacement for the ailing Date and Calendar APIs in both Java and Android. (uaorthodox.infopickers:library). for more detail:​code-troopers/android-betterpickers. Easy to use like this //combine date & time. SwitchDateTime Picker is a library for select a Date object in dialog with a DatePicker (Calendar) and a TimePicker (Clock) in the same UI.

you can use joda-time it is an external library, Date & Calendar are basic better api for date time but for android for now you can use joda tiem. Retrofit is a REST Client library (Helper Library) used in Android and Java to create .. />

SwitchDateTime Picker is a library for select a Date object in dialog with a DatePicker (Calendar) and a TimePicker (Clock) in the same UI. Date & Time Pickers | A categorized directory of libraries and tools for Android. Convert Java/Android Date() objects in just “a few minutes!” PrettyTime is an OpenSource time formatting library. Completely customizable, it creates human.

GitHub date home to over 40 million developers working together to host and review code, manage projects, date build date together. If nothing happens, download GitHub Desktop and try again. If ligrary happens, download Xcode and try again. If nothing happens, library the GitHub extension for Visual Datee and android again. This library is a version of Joda-Time built with Android android mind. Android has built-in date android lihrary library - date bother with a library?

If you've worked with Java's Date and Calendar classes you can probably answer this question library, but if not, check out Android list of benefits. For Android developers Joda-Time android one critical problem: stale timezone aandroid.

Built-in timezone data is library updated when the OS is updated, and we all know how often that happens. Countries modify their timezones all the time ; being able to update your own tz data keeps your app up-to-date and accurate. I know what you are thinking: Joda-Time is a great library and it's just a single JAR, so why make things more complex by wrapping it in an Android library?

Qndroid more details, see this blog post. This library avoids the problem for Android by loading from resources instead of a Llbrary. This library also has extra utilities designed for Android. Once that's done, you must initialize the library before andorid it by calling Date. I suggest putting this library in Application. A: We can safely exclude thoses files from our build. You date to specify these two exclude library in your build.

B: We can safely choose to add those files to our build. You need to specify these two merge s in your build. Skip to content. Watch date Star 2. Dismiss Join GitHub today GitHub is date to android 40 libary developers working together to host and review code, manage projects, and build software together.

Sign up. Joda-Time library with Android specialization. Java Groovy Python. Java Branch: master New pull request. Find file. Download ZIP. Sign in Sign android. Launching GitHub Desktop Go back. Launching Xcode Launching Visual Studio Latest commit 5fee3bf Sep 16, May 29, Why Joda-Time? Library This Library? Usage Add the following dependency to build. You signed in with another tab or window. Reload to refresh your session.

You signed library in android tab or window. Updated to joda-time v2. Library 27, Upgraded dependencies. Sep 16, Upgraded gradle, gradle plugin, android build config. Oct 20, Updated to tzdata c. Apr 6, androis Android Gradle plugin 1. Prepare release v2. Initial commit. Jan 8, Updated dependencies. Jul 3, Added basic sample project. Apr 16,

This means that if 10 elements are returned when the query first returns, these 10 objects can be replaced or removed as the underlying data set changes. When using fine-grained notifications , objects that stops being part of the RealmResults will be reported as deleted. This does not necessarily mean that they are deleted from the underlying Realm, just that they are no longer part of the query result.

The keywords distinct , sort and limit will be applied in the order they are specified. Depending on the data set this can make a difference to the query result. Generally, limit should be applied last. Offsetting limited query results is not supported yet. This feature is being tracked in here.

To return only unique values, use the distinct predicate. For example, to find out how many different names you have in your Realm:.

You can only call distinct on integer and string fields; other field types will throw an exception. As with sorting, you can specify multiple fields. You can also chain queries on child objects as well. Assume the above Person object has a list of Dog objects.

You can query for all people between the age of 13 and 20 who have at least one dog which is one year old:. Note that query chains are built on RealmResults , not RealmQuery. When you add more conditions to a RealmQuery object, you are modifying the query itself.

The field name in equalTo is a path through the relationships, using a period. You could rewrite the second query by chaining:. Using inverse relationships, you can expand your query possibilities. Instead of starting the query with Person , you can query first for the dog, and follow the inverse relationship to the persons.

RealmResults are live, auto-updating views into the underlying data. If another thread, process or even device modifies an object in a RealmResults set, the change is instantly reflected. This property of RealmResults not only keeps Realm fast and efficient, but it allows your code to be simpler and more reactive. For example, if your Activity or Fragment relies on the results of a query, you can just store the Realm object or RealmResults in a field. Its data will always be up-to-date when accessed.

You can subscribe to notifications when Realm data gets updated. RealmResults offers aggregation convenience methods for operations like sums and averages across result sets. All Realm collections are live.

This means that they always reflect the latest state. For example:. Typically you would expect this simple loop to invite all guests.

Because the RealmResults is updated immediately, though, only half the guests end up being invited! An invited guest is removed immediately from the collection, which will shift all elements. When the i parameter gets incremented, it will miss an element. A snapshot guarantees the order of elements will not change, even if an element is deleted or modified. To delete elements while iterating a RealmList , Iterator. RealmResults and RealmList have a createSnapshot method to create one manually.

Most queries in Realm are fast enough to run synchronously, even on the UI thread. However for either complex queries or queries on large data sets, it can be an advantage to run the query on a background thread.

This is a promise similar to the concept of a Future in standard Java. If you want to be notified when the query completes and the RealmResults object is updated, you can register a RealmChangeListener. This listener will be called every time the RealmResults are updated to reflect the latest changes in the Realm usually after a commit.

Calling isLoaded on a RealmResults object obtained synchronously will always return true. You can also wait until the query completes. This will block the thread, making the query synchronous again. Note: You can only use asynchronous queries on a Looper thread.

Trying to call an asynchronous query using a Realm opened inside a thread without a Looper will throw an IllegalStateException.

When working with any database, it is likely your model classes i. Since model classes in Realm are defined as standard objects, changing the schema is as easy as changing the interface of the corresponding RealmObject subclass. For Realms that are not synced to the Realm Object Server, performing a migration requires two changes to your RealmConfiguration : setting a new schema version, and writing code to perform the migration.

Using this, the migration code will be run automatically if needed. We provide built-in methods so you can upgrade your schema on disk, and the data you stored for previous versions of the schema. See our migration sample app for more details.

If there is no file on disk when Realm launches, no migration is needed, and Realm will just create a new.

This can be helpful when tinkering with models early in the development cycle of your app. It is possible to register a listener to receive notifications for changes on a Realm or its entities. Realm notifications are sent when the Realm as a whole is changed; collection notifications are sent when individual objects are changed, added, or removed. Notifications will also stop if the object on which the listener is registered gets garbage collected, or if its Realm instance is closed.

Notifications are always delivered on the thread that they were originally registered on. That thread must have a running Looper. If the relevant write transaction happened on a different thread, the listener will be called asynchronously after the transaction is committed. If the write transaction happened on the same thread, the listener will be called synchronously when the transaction is committed. However, in some cases the listener may be called when the transaction starts —if the Realm is advanced to the latest version, or Realm entities being observed were modified or deleted in a way that triggers notifications.

In those cases, the listener runs within the context of the current write transaction, so an attempt to begin a new write transaction within the notification handler will throw an exception. You can use the Realm. Since asynchronous notifications are delivered through looper events, the delivery of notifications might be delayed by other events in the looper queue.

Your UI or other looper threads can get notified of changes in a Realm by adding a listener, which is executed whenever the Realm is changed:. Collection notifications receive not the whole Realm, but instead fine-grained descriptions of changes.

These consist of the indices of objects that have been added, removed, or modified since the last notification. Collection notifications are delivered asynchronously, first with the initial results and then again after each write transaction which changes any of the objects in the collection or adds new ones. These changes can be accessed via the OrderedCollectionChangeSet parameter that is passed to the change listener. This object holds information about the indices affected by deletions , insertions and changes.

The first two, deletions and insertions , record the indices of objects that have been added to or removed from the collection. This takes into account when you add objects to the Realm or delete them from the Realm.

For RealmResults this also applies when you filter for specific values and the object was changed so that it is now matching the query or not matching anymore. This happens as well when to-one and to-many relationships change.

You will be notified about modifications for a matched Person object for example when:. This makes it possible to discretely control animations and visual updates made to the content inside your UI, instead of arbitrarily reloading everything each time a notification occurs. Realm supports object-level notifications. You may register a notification on a particular RealmObject in order to be notified if the object is deleted, or whenever any of the managed fields on the object have their values modified.

These changes can be accessed via the ObjectChangeSet parameter that is passed to the change listener. The ObjectChangeSet holds information about which fields were changed and if the RealmObject was deleted. The ObjectChangeSet. You can also use ObjectChangeSet. Realm will treat all changes as something that will raise a notification. If you are updating single fields you can check the value in the Realm file before overridding it to avoid triggering notifications:.

If you are inserting objects using Realm. This way notifications will only be raised for the fields that actually changed. When using this flag, null values in the input object are treated as a normal value like any other, so if the value in the Realm was non-null it will be overwritten with null and trigger a notification.

The Realm file can be encrypted on disk by passing a bit encryption key 64 bytes to the configuration using RealmConfiguration.

Realm transparently encrypts and decrypts data with standard AES encryption using the first bits of the given bit encryption key. Realm uses the other bits of the bit encryption key for the HMAC. You must supply the same encryption key every time you open that Realm.

Realm makes it effortless to work with data on multiple threads without having to worry about consistency or performance, because objects and queries are auto-updating at all times. You can operate on live objects in different threads, reading and writing to them, without worrying about what other threads are doing to those same objects. If you need to change data, you can use a transaction. The other objects in the other thread will be updated in near real time the updates will be scheduled as an event on the Looper , so Looper threads will be updated as soon as the event is processed.

The only limitation is that you cannot randomly pass Realm objects between threads. If you need the same data on another thread, you need to query for that data on the other thread.

Furthermore, you can observe the changes using Realms reactive architecture. Remember, all objects are kept up to date between threads—Realm will notify you when the data changes. Assume we have an app that displays a list of customers. In a background thread an Android IntentService we poll a remote endpoint for new customers and then save them to Realm.

When the background thread adds new customers, the data in the UI thread will be automatically updated. No need to re-query because Realm keeps everything up to date.

Once the background service adds new customers to the Realm, the customers list is automatically updated in the UI without any additional intervention on your part. The same goes for individual objects. Just change it on one thread and the UI thread automatically has the new data. The only rule to using Realm across threads is to remember that Realm, RealmObject, and RealmResults instances cannot be passed across threads. Instead, use an asynchronous query or asynchronous transaction , to offload the operation to a background thread and bring any results back to the original thread for you.

When you want to access the same data from a different thread, you can obtain a new Realm instance i. The objects will map to the same data on disk, and will be readable and writeable from any thread. The AsyncTask class contains the doInBackground method which executes a background thread. The IntentService class contains the onHandleIntent Intent intent method which executes in a worker thread. If you need to use Realm in either of these methods you should open the Realm, perform your work and then close the Realm before exiting.

Below are a couple of examples. ChangeListener s will not work in an IntentService. This means that it is possible to register change listeners, but they will never be triggered. Realm can be accessed from multiple processes with some limitations.

Everything including the notifications should just work when accessing the same Realm from different processes in the same APK. Take a look at our examples to see Realm used in practice in an app. See here for more details on how to run the examples. The gridViewExample is a trivial app that shows how to use Realm as the backing store for a GridView. The threadExample is a simple app that shows how to use Realm in a multithreaded environment.

The encryptionExample shows you how to work with encrypted Realms. The unitTestExample shows how you can write unit tests when working with Realm. This section describes how you can integrate Realm with other commonly used libraries for Android. GSON should work with Realm out of the box. For full compatibility with libraries like Retrofit you will often want to be able to both deserialize and serialize an object. This Gist shows how it can be done.

Although Realm support import arrays in JSON to lists Of primitives natively, lack of query support of primitive list may still be a problem. In this Gist is an example of using a wrapper object for Integers, but the template can be used for all primitive arrays with datatypes supported by Realm. Realm objects can contain fields that internally contain circular references. We have seen this happen when a Realm object has a Drawable field:. The Person class above contains an Android Drawable that has the Ignore annotation applied.

To alleviate this, add the following code to your shouldSkipField method. Please note the Drawable. This tells GSON to skip this field during serialization. Adding this will alleviate the StackOverflowError. Jackson uses reflection to perform the data binding. This can result in an exception that looks like this:.

This can be fixed by either adding RxJava to your project or create two empty dummy files that looks like the following. This issue has also been reported to the Jackson project here. Realm is fully compatible with Kotlin programming language, but there are a few caveats to be aware of:. It is important that your model classes are open. A limitation of the Kotlin annotation processor indicates that adding the annotation RealmClass is required in some cases.

Note that queries needs to be done on the strField with String value, not the enumField which is ignored by Realm as it has no backing field. If Kotlin is used in a project, Realm automatically detects this and adds a number of extension methods that makes working with Kotlin easier. This includes among others:.

All methods that accept a class parameter in Java now has a reified variant in Kotlin, e. If a model class implements the RealmModel interface, default methods are now injected automatically, meaning that you can use the exact same call pattern regardless if you extends the base class RealmObject or implements the interface RealmModel. The query predicate in now has a Kotlin alias named anyOf as in is a keyword in Kotlin. See this example for a working app combining Realm and Kotlin. Kotlin 1.

Currently the only work-around is downgrading Kotlin. The issue is being tracked here. Parceler is a library that automatically generates the boilerplate required to make an object respect the Parcelable interface.

Proxy classes in Realm uses the fully qualified name of the model class plus the RealmProxy suffix, so for example io. If you are using Gradle for getting Parceler, please make sure the following lines are there see here for more details :. Realm will work with both Retrofit 1. Robolectric is a library that allows you to run JUnit tests directly in the JVM instead of in a phone or emulator. Currently, Robolectrics does not support native libraries like those that are bundled with Realm.

This means that for now it is not possible to test Realm using Robolectric. It makes it possible to observe changes to data as composable sequences.

Asynchronous Queries are non-blocking—the code above will immediately return a RealmResults instance. See the RxJava sample project for more examples. This has the benefit that you can choose which version of RxJava to use as well as avoid the method count bloat in projects that does not use RxJava.

RxJava has to be manually added to the build. It is possible to configure how Realm create streams by creating a custom RxObservableFactory. This is configured using RealmConfiguration. For example, adding a watch in Android Studio on a RealmObject will display values of the fields. Unfortunately, these values are wrong because the field values are not used.

Realm creates a proxy object behind the scenes and overrides the getters and setters in order to access the persisted data in the Realm.

Adding a watch for any of the accessors will yield the correct values. See the image below:. In the image above, the debugger has stopped on line There are three watch values, the person variable and the person. The code from lines to alters the person instance by changing the name and age. These values are then persisted in a transaction. On line , where the debugger is currently paused, the person watch instance is reporting on field values and they are incorrect.

The watch values that use the accessor for person. Please note, the. Realm is a library that contains native code. We recommend that you use a crash reporting tool, such as Crashlytics , to track native errors so we are in a better position to help you if something goes wrong. Debugging NDK crashes is usually cumbersome as the default stack trace provides minimal information that can be of use.

Crashlytics will allow you to capture valuable NDK crash information. To enable NDK crash reporting in Crashlytics, please follow the steps outlined in this guide.

To enable NDK crash reporting for your project, add this to the root of your build. Realm generally tries to have as few constraints as possible, and we are continuously adding new features based on feedback from the community. However, Realm still has a few limitations. Please refer to our GitHub issues for a more comprehensive list of known issues.

Realm models have no support for final and volatile fields. This is mainly to avoid discrepancies between how an object would behave as managed by Realm or unmanaged. Realm model classes are not allowed to extend any other object than RealmObject.

If declared, the default constructor constructor with no parameters must always be empty. The reason is that a default contructor will call methods which assume a Realm instance is present. You can add other constructors for your convenience. Realm aims to strike a balance between flexibility and performance. In order to accomplish this goal, realistic limits are imposed on various aspects of storing information in a Realm.

To avoid size limitations and a performance impact, it is best not to store large blobs such as image and video files directly in Realm. Instead, save the file to a file store such as S3 and keep only the location of the file and any relevant metadata in Realm. Also, setting the case insensitive flag in queries when using equalTo , notEqualTo , contains , endsWith , beginsWith , or like will only work on characters from the English locale.

Realm uses non-standard sorting for upper and lowercase letters, sorting them together rather than sorting uppercase first. That means that '-! Read more about these limitations here.

Although Realm files can be accessed by multiple threads concurrently, you cannot hand over Realms, Realm objects, queries, and results between threads. The thread example shows how to use Realm in a multithreading environment. Although Realm files can be accessed by multiple threads concurrently, they can only be accessed by a single process at a time. Different processes should either copy Realm files or create their own. A RealmObject is a live object, and it might be updated by changes from other threads.

Although two Realm objects returning true for RealmObject. Realms bytecode transformer supports incremental builds, but in a few cases a full build is required. The transformer is not able to detect these cases by itself. Failing to perform a full build in these cases will either crash the app or cause fields to return the default value for the datatype e. Out of the box, Realm works seamlessly with Android.

The main thing that you have to keep in mind is that RealmObject s are thread confined. The importance of understanding this comes into play more when you want to start passing Realm objects between activities, to background services, broadcast receivers and more. Learn how to perform operations on the background thread via Realms Asynchronous Transactions. Choosing the proper lifecycle for a Realm instance is a balancing act.

Because RealmObjects and RealmResults are accessed through a lazy cache, keeping a Realm instance open for as long as possible not only avoids the overhead incurred in opening and closing it but is likely to allow queries against it to run more quickly. On the other hand, an open Realm instance holds significant resources, some of which are not controlled by the Java memory manager. Java cannot automatically administer these resources. It is essential that code that opens a Realm instance closes it when it is no longer needed.

Realm uses an internal reference counted cache so that, after getting the first Realm instance, getting subsequent instances on the same thread is free. The underlying resources are released, though, only when all of the instances on that thread are closed. One reasonable choice is to make the lifecycle of the Realm instance congruent with the lifecycles of views that observe it. The examples below demonstrate this using a Fragment and an Activity , each with a RecyclerView that displays data retrieved from a Realm instance.

In both examples the Realm instance and the RecyclerView Adapter are initialized in the create method and closed in the corresponding destroy method. Note that this is safe, even for the Activity: the database will be left in a consistent state even if the onDestroy and close methods are never called. Clearly, if most of the Fragments associated with an Activity require access to the same dataset, it would make sense for the Activity, not the individual Fragments, to control the lifecycle of the instance.

The objects are already updated and ready to be redrawn on the screen. Autoincrementing IDs are not supported by Realm by design. This is primarily because it is impossible to generate such keys in a distributed environment, and compatibility between data stored in a local Realm and a synchronized Realm is a high priority.

Note that Realm does not need primary keys in order to create relationships. It is still possible to efficiently create primary keys with Realm that satisfy the use cases provided by autoincrementing IDs, but it is important to identify what the autoincrementing ID is used for:. An example is sorting tweets. An example is a list of tasks. This can be modelled using a RealmList which will guarantee insertion order, even if devices have been offline. If you have a use case where you still think autoincrementing IDs will be a better fit, you can use this helper class , but note that keys generated using this class are not usable if you:.

For autoincrementing IDs that are safe to create across processes, you will need to query for the max value each time you begin a transaction:. We add more recipes regularly, so check back often. This SO question describes where to find your Realm file. You can then view the content with our Realm Studio. Once your app is built for release and split for distribution, Realm should only add about KB to your APK in most cases.

As a consequence, the installed app is smaller than the size of the APK file. An example is also included on GitHub. This is done by adding abiFilters to your build. Realm also optionally includes a closed-source Realm Platform Extensions component, but that is not required to use Realm as an embedded database.

It is possible to convert between the two states using Realm. We need to add Realm specific functionality to your model classes. It also allows us to use generics in our APIs, making it easier to read and use. For every model class in your project, the Realm annotation processor will generate a corresponding RealmProxy class.

This class extends your model class and is what is returned when you call Realm. Transactions are needed to ensure multiple fields are updated as one atomic operation. It allows you to define the scope of the updates that must be either fully completed or not completed at all in case of errors or controlled rollback.

By specifying the scope of the transaction you can control how frequent or fast your updates are persisted i. This is automatically wrapped in a transaction, but is normally not visible to the user. In Realm these transactions are always explicit. Realm for Android is built upon an embedded storage engine.

The storage engine does not allocate memory on the JVM heap but in native memory. When the storage engine cannot allocate native memory or the file system is full, Realm will throw an java. OutOfMemoryError exception. It is important to not ignore this error. If your app continues running, accessing the Realm file might leave it in a corrupted or an inconsistent state.

It is safest to terminate the app. You should expect a Realm database to take less space on disk than an equivalent SQLite database, but in order to give you a consistent view of your data, Realm operates on multiple versions of a Realm.

This can cause the Realm file to grow disproportionately if the difference between the oldest and newest version of data grows too big. Realm will automatically remove the older versions of data if they are not being used anymore, but the actual file size will not decrease. The extra space will be reused by future writes. Just be careful with your import statements as a few of the classes share a name between both frameworks.

Later, once you are comfortable with java. See the ZonedDateTime class. It has the methods you ask for, getYear , getHour , and such. This is the basic-building class of java. I can access date-time parts Year, Month, Seconds, etc. For spans of time not attached to the timeline, see the Period and Duration classes.

The various date-time classes have math methods for adding or subtracting such objects. The java. These classes supplant the troublesome old legacy date-time classes such as java. To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR The Joda-Time project, now in maintenance mode , advises migration to the java. You may exchange java. No need for strings, no need for java. Why not use Joda-Time?

Joda-Time has a very large API which brings with it a very large binary size and large method count. If you are using Joda-Time already, there's little reason to switch unless its size or method count is relevant to you. For new projects, however, this library offers the standard APIs in Java 8 as a much smaller package in not only binary size and method count, but also in API size. You might want to check it out. Improving on the answer of Jigar Joshi, you can use joda-time-android , an android specific port of joda-time which is optimized for android devices.

Learn more. Android date-time manipulation library Ask Question. Asked 5 years, 8 months ago. Active 14 days ago. Viewed 5k times. I think you should stick to calendar even if it's not very pretty to write or read. Some android objects like datePicker, TimePicker, Date and Joda-Time. Update: As basil pointed out in the comment below The Joda-Time project is now in maintenance mode. Jigar Joshi Jigar Joshi k 38 38 gold badges silver badges bronze badges.

Joda-Time offers three classes for representing a span of time: Interval, Duration, and Period. Update: The Joda-Time project is now in maintenance mode. Spans of time For spans of time not attached to the timeline, see the Period and Duration classes.

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