InputManager

ACTION_QUERY_KEYBOARD_LAYOUTS

public static final String ACTION_QUERY_KEYBOARD_LAYOUTS

Broadcast Action: Query available keyboard layouts.

The input manager service locates available keyboard layouts by querying broadcast receivers that are registered for this action. An application can offer additional keyboard layouts to the user by declaring a suitable broadcast receiver in its manifest.

Here is an example broadcast receiver declaration that an application might include in its AndroidManifest.xml to advertise keyboard layouts. The meta-data specifies a resource that contains a description of each keyboard layout that is provided by the application.

 <receiver android:name=".InputDeviceReceiver"
         android:label="@string/keyboard_layouts_label">
     <intent-filter>
         <action android:name="android.hardware.input.action.QUERY_KEYBOARD_LAYOUTS" />
     </intent-filter>
     <meta-data android:name="android.hardware.input.metadata.KEYBOARD_LAYOUTS"
             android:resource="@xml/keyboard_layouts" />
 </receiver>
 

In the above example, the @xml/keyboard_layouts resource refers to an XML resource whose root element is <keyboard-layouts> that contains zero or more <keyboard-layout> elements. Each <keyboard-layout> element specifies the name, label, and location of a key character map for a particular keyboard layout. The label on the receiver is used to name the collection of keyboard layouts provided by this receiver in the keyboard layout settings.

 <?xml version="1.0" encoding="utf-8"?>
 <keyboard-layouts xmlns:android="http://schemas.android.com/apk/res/android">
     <keyboard-layout android:name="keyboard_layout_english_us"
             android:label="@string/keyboard_layout_english_us_label"
             android:keyboardLayout="@raw/keyboard_layout_english_us" />
 </keyboard-layouts>
 

The android:name attribute specifies an identifier by which the keyboard layout will be known in the package. The android:label attribute specifies a human-readable descriptive label to describe the keyboard layout in the user interface, such as "English (US)". The android:keyboardLayout attribute refers to a key character map resource that defines the keyboard layout. The android:keyboardLocale attribute specifies a comma separated list of BCP 47 language tags depicting the locales supported by the keyboard layout. This attribute is optional and will be used for auto layout selection for external physical keyboards. The android:keyboardLayoutType attribute specifies the layoutType for the keyboard layout. This can be either empty or one of the following supported layout types: qwerty, qwertz, azerty, dvorak, colemak, workman, extended, turkish_q, turkish_f. This attribute is optional and will be used for auto layout selection for external physical keyboards.

Constant Value: "android.hardware.input.action.QUERY_KEYBOARD_LAYOUTS"

META_DATA_KEYBOARD_LAYOUTS

public static final String META_DATA_KEYBOARD_LAYOUTS

Metadata Key: Keyboard layout metadata associated with ACTION_QUERY_KEYBOARD_LAYOUTS.

Specifies the resource id of a XML resource that describes the keyboard layouts that are provided by the application.

Constant Value: "android.hardware.input.metadata.KEYBOARD_LAYOUTS"

getHostUsiVersion

public HostUsiVersion getHostUsiVersion (Display display)

Reports the version of the Universal Stylus Initiative (USI) protocol supported by the given display, if any.

getInputDevice

public InputDevice getInputDevice (int id)

Gets information about the input device with the specified id.

getInputDeviceIds

public int[] getInputDeviceIds ()

Gets the ids of all input devices in the system.

getInputDeviceViewBehavior

public InputDevice.ViewBehavior getInputDeviceViewBehavior (int deviceId)

Gets the InputDevice.ViewBehavior of the input device with a given id.

Use this API to query a fresh view behavior instance whenever the input device changes.

getMaximumObscuringOpacityForTouch

public float getMaximumObscuringOpacityForTouch ()

Returns the maximum allowed obscuring opacity per UID to propagate touches.

For certain window types (eg. LayoutParams.TYPE_APPLICATION_OVERLAY), the decision of honoring LayoutParams.FLAG_NOT_TOUCHABLE or not depends on the combined obscuring opacity of the windows above the touch-consuming window, per UID. Check documentation of LayoutParams.FLAG_NOT_TOUCHABLE for more details.

The value returned is between 0 (inclusive) and 1 (inclusive).

isStylusPointerIconEnabled

public boolean isStylusPointerIconEnabled ()

Check if showing a PointerIcon for styluses is enabled.

registerInputDeviceListener

public void registerInputDeviceListener (InputManager.InputDeviceListener listener, 
                Handler handler)

Registers an input device listener to receive notifications about when input devices are added, removed or changed.

unregisterInputDeviceListener

public void unregisterInputDeviceListener (InputManager.InputDeviceListener listener)

Unregisters an input device listener.

verifyInputEvent

public VerifiedInputEvent verifyInputEvent (InputEvent event)

Verify the details of an InputEvent that came from the system. If the event did not come from the system, or its details could not be verified, then this will return null. Receiving null does not mean that the event did not originate from the system, just that we were unable to verify it. This can happen for a number of reasons during normal operation.