App Widgets | Android Developers
Issue: AppWidgetProvider is-a BroadcastReceiver. You are retrieving a PendingIntent which starts a service, instead of retrieving a PendingIntent which sends a. May 9, AppWidgetProvider" > called the first time a widget is placed (is not called when adding a . Following is BroadcastReceiver for time and date update. A convenience class to aid in implementing an AppWidget provider. Everything you This callback will be followed immediately by a call to onUpdate(Context.
You should therefore not store any data in your RemoteViewsService unless it is static.
Creating a home screen Widget for Android | n3ws.info
Specifically, you need to perform these steps: To do this, it combines your app widget item XML layout file with a source of data. This source of data could be anything from a database to a simple array. The RemoteViewsFactory functions as an adapter to glue the data to the remote collection view.
Taking more than 20 seconds in this call will result in an ANR. But what if you want to add dynamic behavior to the individual items in your collection view? This is how it works: Individuals items of a collection cannot set up their own pending intents.
Android-er: Update Widget in onReceive() method
Instead, the collection as a whole sets up a pending intent template, and the individual items set a fill-in intent to create unique behavior on an item-by-item basis. This class also receives the broadcast that is sent when the user touches a view. This makes it possible to distinguish the individual on-click action of a given item. One feature of App Widgets that use collections is the ability to provide users with up-to-date content.
For example, consider the Android 3. This Activity launches when placing the widget to set configuration options.
Here is an example manifest entry: Here is a sample AppWidgetProviderInfo. Be judicious with this value, and do not set it higher than you need to.
In many cases, it is more efficient to have other services or observers notifying you of changes that require an AppWidget update. In fact, Android will not deliver updates to an AppWidget more frequently than 30 minutes milliseconds. As it's BroadcastReceiver, the class still receives the OS broadcast events, but the helper class filters those events down to those applicable for an AppWidget.
The AppWidgetProvider class exposes the following methods: Usually not overridden as the default implementation only sends the applicable events. Because AppWidgetProvider is a BroadcastReceiver, it is not considered good practice to do long operations inside of it.
It is also possible to have multiple AppWidgets loaded on a single Launcher screen. The array of IDs references each individual AppWidget so you can update them all at once. Internally, Android keeps track of the widget instances by allocating them unique IDs. This unique widget instance ID is passed to the callbacks and to the configurator class so that initial configuration and updates can be directed to the right instance of the widget on the homepage.
This is what you typically need to do in an onUpdate method: Make sure the configurator Activity has finished its work; otherwise, just return. This should not be problem in releases 2. Otherwise, based on the update interval when it is too small it is possible that onUpdate will be called before the user has finished configuring the widget in the configurator. Retrieve the persisted data for that widget instance.
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Retrieve the widget view layout, and create a RemoteViews object with it. Call methods on the RemoteViews to set values on individual view objects such as text and images.
Register any onClick events on any of the views by using pending intents. We'll start by creating the widget layout, which resides in the standard layout resource directory. Then we'll create the xml resource directory to store the AppWidgetProviderInfo file. We'll add a new Java class and extend AppWidgetProviderwhich handles the onUpdate call for the widget.
With the receiver created, we can then add it to the Android Manifest. Since the update will wake up the device, it's a trade-off between having up-to-date data and battery life. We'll use AlarmManager for time update. Therefore, to get the layout, we call RemoteViews with our fully qualified package name and the layout ID.
Once we have the layout, we can attach the pending intent to the button views using setOnClickPendingIntent. Following is BroadcastReceiver for time and date update. After first running the application, the widget will then be available to add to the Home screen. Result You can get images for this project here.
Also I disabled MainActivity as launch activity. For this, go to Run - Edit configurations Update widget via a service The following will demonstrate the usage of a service to update the widget. With auto update feature, your widget become lively and useful! Create the following UpdateWidgetService class in your project.
We need to start the service in every minute for this example in the AppWidgetProvider.