Use with GetSystemService String to retrieve a PowerManager for controlling power management, including "wake locks," which let you keep the device on while you're running long tasks. PrintManager for printing and managing printers and print tasks. Use with GetSystemService String to retrieve a RestrictionsManager for retrieving application restrictions and requesting permissions for restricted operations.
Use with GetSystemService String to retrieve a TelephonyManager for handling management the telephony features of the device. Use with GetSystemService String to retrieve a com. Returns the unique instance of Class that represents this object's class. Returns the absolute path to the application specific cache directory on the filesystem designed for storing cached code. Retrieve the Scene representing this window's current content. Retrieve the TransitionManager responsible for default transitions in this window.
Calls CurrentFocus on the Window of this Activity to return the currently focused view. Returns the absolute path to the directory on the primary external filesystem that is somewhere on ExternalStorageDirectory where the application can place cache files it owns. Returns the absolute path to the directory on the filesystem where files created with OpenFileOutput String, FileCreationMode are stored.
Bit indicating that this activity is "immersive" and should not be interrupted by notifications if possible. Check to see whether this activity is in the process of being destroyed in order to be recreated with a new configuration.
Returns true if the final OnDestroy call has been made on the Activity, so this instance is now dead. Check to see whether this activity is in the process of finishing, either because you called Finish on it or someone else has requested that it finished. Retrieve the non-configuration instance data that was previously returned by OnRetainNonConfigurationInstance. Convenience for calling LayoutInflater.
Gets the controller which should be receiving media key and volume events while this activity is in the foreground. Returns a MenuInflater with this context. Returns the absolute path to the directory on the filesystem similar to FilesDir. Return the primary external storage directory where this application's OBB files if there are any can be found. Obtain an Intent that will launch an explicit target activity specified by this activity's logical parent.
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. Retrieve the current Window for the activity. Call to set an "override configuration" on this context -- this is a configuration that replies one or more values of the standard configuration that is applied to the context.
Determine whether the calling process of an IPC or you have been granted a particular permission. Determine whether the calling process of an IPC you are handling has been granted a particular permission. Determine whether the calling process and user ID has been granted permission to access a specific URI. Determine whether the given permission is allowed for a particular process and user ID running in the system.
Determine whether a particular process and user ID has been granted permission to access a specific URI. Return a new Context object for the current Context but whose resources are adjusted to match the given Configuration. Return a new Context object for the current Context but whose resources are adjusted to match the metrics of the given Display. Returns an array of strings naming the private databases associated with this Context's application package.
Dismiss a dialog that was previously shown via ShowDialog Int Called to process population of AccessibilityEvent s. If neither you nor the calling process of an IPC you are handling has been granted a particular permission, throw a SecurityException.
If the calling process of an IPC you are handling has not been granted a particular permission, throw a SecurityException. If the given permission is not allowed for a particular process and user ID running in the system, throw a SecurityException.
Returns an array of strings naming the private files associated with this Context's application package. Finish this activity as well as all activities immediately below it in the current task that have the same affinity.
Reverses the Activity Scene entry Transition and triggers the calling Activity to reverse its exit Transition. Call this when your activity is done and should be closed and the task should be completely removed as a part of finishing the Activity. This is called when a child activity of this one calls its Finish method.
Retrieve, creating if needed, a new directory in which the application can place its own custom data files. Returns a drawable object associated with a particular resource ID and styled for the current theme. Returns absolute paths to application-specific directories on all external storage devices where the application can place cache files it owns.
Returns the absolute path to the directory on the primary external filesystem that is somewhere on ExternalStorageDirectory where the application can place persistent files it owns. Returns absolute paths to application-specific directories on all external storage devices where the application can place persistent files it owns.
Returns absolute paths to application-specific directories on all external storage devices where the application can place media files. Returns absolute paths to application-specific directories on all external storage devices where the application's OBB files if there are any can be found. Retrieve a ISharedPreferences object for accessing preferences that are private to this activity.
Retrieve and hold the contents of the preferences file 'name', returning a SharedPreferences through which you can retrieve and modify its values. Grant permission to access a specific Uri to another package, regardless of whether that package has general permission to access the Uri's content provider. Navigate from this activity to the activity specified by upIntent, finishing this activity in the process.
This is called when a child activity of this one calls its NavigateUpTo Intent method. Causes a thread which is waiting on this object's monitor by means of calling one of the wait methods to be woken up. Causes all threads which are waiting on this object's monitor by means of calling one of the wait methods to be woken up.
Called when an activity you launched with an activity transition exposes this Activity through a returning activity transition, giving you the resultCode and any additional data from it.
Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it. Called by Android. Called when the main window associated with the activity has been attached to the window manager. Called when a Fragment is being attached to this activity, immediately after the call to its OnAttach Activity method and before OnCreate Bundle. This hook is called whenever the content view of the screen changes due to a call to M:Android.
SetContentView Android. Called when a context menu for the view is about to be shown. Define the synthetic task stack that will be generated during Up navigation from a different task. Called when the main window associated with the activity has been detached from the window manager.
This is called when the overall system is running low on memory, and actively running processes should trim their memory usage. This method is called whenever the user chooses to navigate Up within your application's activity hierarchy from the action bar. Called as part of the activity lifecycle when an activity is going into the background, but has not yet been killed.
Called when activity resume is complete after OnResume has been called. Prepare the synthetic task stack that will be generated during Up navigation from a different task. This is called when the user is requesting an assist, to build a full ActionAssist Intent with all of the context of the current application.
Called after OnStop when the current activity is being re-displayed to the user the user has navigated back to it. This method is called after OnStart when the activity is being re-initialized from a previously saved state, given here in savedInstanceState.
Called by the system, as part of destroying an activity due to a configuration change, when it is known that a new instance will immediately be created for the new configuration. Called to retrieve per-instance state from an activity before being killed so that the state can be restored in OnCreate Bundle or OnRestoreInstanceState Bundle the Bundle populated by this method will be passed to both. Called when the operating system has determined that it is a good time for a process to trim unneeded memory from its process.
Called as part of the activity lifecycle when an activity is about to go into the background as the result of user choice. Called when a translucent activity over this activity is becoming opaque or another activity is being launched. Called when the current Window of the activity gains or loses focus.
Programmatically opens the context menu for a particular view. Call immediately after one of the flavors of M:Android. StartActivity or Finish to specify an explicit transition animation to perform next. Add a new IComponentCallbacks to the base application of the Context, which will be called at the same times as the ComponentCallbacks methods of activities and other components are called. Registers a context menu to be shown for the given view multiple views can show the context menu.
Report to the system that your app is now fully drawn, purely for diagnostic purposes calling it does not impact the visible behavior of the activity. Activities that want to remain visible behind a translucent activity above them must call this method anytime between the start of OnResume and the return from OnPause.
Remove all permissions to access a particular content provider Uri that were previously added with M:Android. GrantUriPermission System. Broadcast the given intent to all interested BroadcastReceivers, allowing an optional required permission to be enforced. Version of SendBroadcast Intent that allows you to specify the user the broadcast will be sent to.
Version of SendBroadcast Intent, String that allows you to specify the user the broadcast will be sent to. Version of SendBroadcast Intent that allows you to receive data back from the broadcast. Set a Toolbar to act as the ActionBar for this Activity window. Sets the Handle property. Sets whether the horizontal progress bar in the title should be indeterminate the circular is always indeterminate.
Sets information describing the task with this activity for presentation inside the Recents System UI. Returns true if the app should recreate the task when navigating 'up' from this activity by using targetIntent.
Simple version of ShowDialog Int32, Bundle that does not take any arguments. Start an action mode of the default type Primary. Same as StartActivities Intent[], Bundle with no options specified. Same as StartActivity Intent, Bundle with no options specified. Same as calling M:Android. StartActivityForResult Android. Int32 with no options. StartActivityFromChild Android. Intent with no options. This is called when a child activity of this one calls its M:Android.
StartActivityFromFragment Android. StartActivityIfNeeded Android. A special variation to launch an activity only if a new activity instance is needed to handle the given Intent. Start executing an Instrumentation class. This method allows the activity to take care of managing the given ICursor 's lifecycle for you based on the activity's lifecycle.
Special version of starting an activity, for use when you are replacing other activity components. Begin postponed transitions after PostponeEnterTransition was called.
Given a Cursor that was previously given to StartManagingCursor ICursor , stop the activity's management of that cursor. Similar to M:Android. StartSearch System. Boolean , but actually fires off the search query after invoking the search dialog. Causes the calling thread to wait until another thread calls the notify or notifyAll method of this object.
Causes the calling thread to wait until another thread calls the notify or notifyAll method of this object or until the specified timeout expires. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.
Contents Exit focus mode. App Assembly: Mono. Change your activity so that it is similar to the following code. The project wizard generated an ActionBar entry. This entry is used in the following code. If in doubt, create your own ActionBar entry. The following will implement a performance optimized version of the adapter from the previous example. Use your new adapter in your activity.
If you run the application it should look the same but it will be much faster, especially for large datasets. You can use the SimpleAdapter class to show the data of two elements. This class expects an Array of Strings from data in which the fields of the input data are defined. It also requires an Array of ints which defines the IDs of the widgets in the layout for the row to which these fields are mapped. The actual data is then a list of Maps.
The Map defines for each field in the from data a value. Frequently you need to select items in your ListView. As the rows of the ListView are getting recycled you cannot store the selection on the View level. Selection is just one possible example but you can imagine other interaction between your row and model. To update the data model in your ListView you define your own Adapter class.
In this adapter class you attach a listener to the View which is responsible for selecting the model element. If selected, you update the state in the model which you can add as a tag to the View to have access to it. The following example demonstrates how to use standard Java objects and how to interact from the Views with the model. Create the following Model which holds the name and the information if this element is currently selected. Create the following Adapter.
This adapter adds a listener on the Checkbox view. If the checkbox is selected the underlying data of the model is changed. Checkbox gets the corresponding model element assigned via the getTag method. If you start your app you should be able to flag items. These changes will be reflected in your model.
The ExpandableListView is similar to ListView , but allows you to define groups and details for this group. In this case you have to define two layouts, one for the group and another one for the details row. Create a project called com.
Create the following class which holds your domain model for the ExpandableListView. Finally create the adapter as described by the following listing and change the activity to the code provided below. You can of course put arbitrary views elements around your list view. For example you can define a layout with two text views and a list view between them.
In this case the two text views will always be visible above the list header and the other will be visible below the list. If you want to display a list header or list footer only at the beginning or end of the list you can use the addHeaderView method or addFooterView method on the ListView class.
In case you work with a content provider or directly with the database you can use the SimpleCursorAdapter to define the data for your ListView. The following will demonstrate how to access the Contacts ContentProvider. Create a new Android project called "de. Change MyListActivity to the following.
Make sure you give your application the permission to read the contacts Uses Permissions "android. Sometimes having to press a refresh button on the ActionBar to refresh data can be annoying for the user. Chris Banes has implemented an Open Source library to implement the pull to refresh pattern for a Listview. Also you may want to use the swipe to dismiss gesture to delete items from a ListView. ListView demo which uses 3D effects GitHub. Google documentation about RecyclerView.
ListView demo which uses 3D effects Github. Free use of the software examples is granted under the terms of the Eclipse Public License 2. Sponsor our Open Source development activities and our free content to help us make development easier for everyone.
This tutorial describes how to use ListView together with activities and fragments in Android. Using lists in Android The display of elements in a list is a very common pattern in mobile applications. Android and the ListView widget 2. Views for handling lists Android provides the ListView and the ExpandableListView classes which are capable of displaying a scrollable list of items.
Possible input types for lists The input of a list items in the list can be arbitrary Java objects. Adapters An adapter manages the data model and adapts it to the individual entries in the widget. Filtering and sorting The filtering and sorting of the data is handled by the adapter. Data updates in the adapter The notifyDataSetChanged method on the adapter is called if the data has changed or if new data is available. Default adapter 3.
Default platform adapter Android provides default adapter implementations; the most important are ArrayAdapter and CursorAdapter. If you want to change the data in your adapter, the underlying data structure must support this operation. This is, for example, the case for the ArrayList class, but not for arrays. Custom adapter implementations 4.
Developing a custom adapter The ArrayAdapter is limited as it supports only the mapping of toString to one view in the row layout. Frequently you extend ArrayAdapter to write a custom adapter, as this is simpler than extending BaseAdapter directly.
Preparing a row for the list The adapter needs to create a layout for each row of the list. This layout inflator service can get accessed via the getLayoutInflator method of the activity or via the context.
Example for a custom adapter The following code shows an implementation of a custom adapter. Context ; import android. LayoutInflater ; import android. View ; import android. ViewGroup ; import android. ArrayAdapter ; import android. ImageView ; import android. Updating the data model from the adapter The row can also contain views which interact with the underlying data model via the adapter. ListActivity and ListFragment 5. Default container for using ListView Android provides specialized fragment and activity classes to simplify list handling.
The following example code shows a simple ListFragment implementation. Intent ; import android. Bundle ; import android. ListView ; import android. The next example code demonstrates the usage of a ListActivity.
ListActivity ; import android. If you do not use this ID or do not include a ListView into your layout, the application crashes once you try to display the activity or the fragment. Exercise: ListActivity with custom layout In our example your will define your layout for the rows and use it in your adapter. Tutorial: Implementing your customer adapter The following uses two images "no.
Lester Burnham. Start by studying the javadocs of ListActivity. It has an introductory section that explains how to use it, and lists the methods with which ListActivity extends Activity. Once you know what those do, and think about what you'd need to do in an Activity to achieve the same result, it should become clear how it works. In a nutshell, it's by managing a ListAdapter and using a ListView to display it. You showed up just in time for the waffles!
And this tiny ad:. Boost this thread! List Activity and using ListView without it. Update the List View at run time.
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