android.view.InputDevice#getDevice ( )源码实例Demo

private void gatherControllers(boolean sendEvent) {
	// gather all joysticks and gamepads, remove any disconnected ones
	IntMap<AndroidController> removedControllers = new IntMap<AndroidController>();
	removedControllers.putAll(controllerMap);
	
	for(int deviceId: InputDevice.getDeviceIds()) {
		InputDevice device = InputDevice.getDevice(deviceId);
		AndroidController controller = controllerMap.get(deviceId);
		if(controller != null) {
			removedControllers.remove(deviceId);
		} else {
			addController(deviceId, sendEvent);
		}
	}
	
	for(Entry<AndroidController> entry: removedControllers.entries()) {
		removeController(entry.key);
	}
}
 

protected void addController(int deviceId, boolean sendEvent) {
	try {
		InputDevice device = InputDevice.getDevice(deviceId);
		if (!isController(device)) return;
		String name = device.getName();
		AndroidController controller = new AndroidController(deviceId, name);
		controllerMap.put(deviceId, controller);
		if (sendEvent) {
			synchronized (eventQueue) {
				AndroidControllerEvent event = eventPool.obtain();
				event.type = AndroidControllerEvent.CONNECTED;
				event.controller = controller;
				eventQueue.add(event);
			}
		} else {
			controllers.add(controller);
		}
		Gdx.app.log(TAG, "added controller '" + name + "'");
	} catch (RuntimeException e) {
		// this exception is sometimes thrown by getDevice().
		// we can't use this device anyway, so ignore it and move on
	}
}
 

/**
 * Check for any game controllers that are connected already.
 */
private void checkGameControllers() {
    Log.d(TAG, "checkGameControllers");
    int[] deviceIds = mInputManager.getInputDeviceIds();
    for (int deviceId : deviceIds) {
        InputDevice dev = InputDevice.getDevice(deviceId);
        int sources = dev.getSources();

        // Verify that the device has gamepad buttons, control sticks, or
        // both.
        if (((sources & InputDevice.SOURCE_GAMEPAD) == InputDevice.SOURCE_GAMEPAD)
                || ((sources & InputDevice.SOURCE_JOYSTICK)
                    == InputDevice.SOURCE_JOYSTICK)) {
            // This device is a game controller. Store its device ID.
            if (!mConnectedDevices.contains(deviceId)) {
                mConnectedDevices.add(deviceId);
                if (mCurrentDeviceId == -1) {
                    mCurrentDeviceId = deviceId;
                    mControllerView.setCurrentControllerNumber(dev.getControllerNumber());
                    mControllerView.invalidate();
                }
            }
        }
    }
}
 

@Override
public void onInputDeviceRemoved(int deviceId) {
    Log.d(TAG, "onInputDeviceRemoved: " + deviceId);
    mConnectedDevices.remove(new Integer(deviceId));
    if (mCurrentDeviceId == deviceId) {
        mCurrentDeviceId = -1;
    }
    if (mConnectedDevices.size() == 0) {
        mControllerView.setCurrentControllerNumber(-1);
        mControllerView.invalidate();
    } else {
        mCurrentDeviceId = mConnectedDevices.get(0);
        InputDevice dev = InputDevice.getDevice(mCurrentDeviceId);
        if (dev != null) {
            mControllerView.setCurrentControllerNumber(dev.getControllerNumber());
            mControllerView.invalidate();
        }
    }
}
 

/** Looks up the hardware resolution of the Glass touchpad. */
private void lookupTouchpadHardwareResolution() {
    int[] deviceIds = InputDevice.getDeviceIds();
    for (int deviceId : deviceIds) {
        InputDevice device = InputDevice.getDevice(deviceId);
        if ((device.getSources() & InputDevice.SOURCE_TOUCHPAD) != 0) {
            logVerbose("Touchpad motion range: x-axis [%d, %d] y-axis [%d, %d]",
                    device.getMotionRange(MotionEvent.AXIS_X).getMin(),
                    device.getMotionRange(MotionEvent.AXIS_X).getMax(),
                    device.getMotionRange(MotionEvent.AXIS_Y).getMin(),
                    device.getMotionRange(MotionEvent.AXIS_Y).getMax());

            mTouchpadHardwareWidth = device.getMotionRange(MotionEvent.AXIS_X).getRange();
            mTouchpadHardwareHeight = device.getMotionRange(MotionEvent.AXIS_Y).getRange();
            // Stop after we've seen the first touchpad device, because there might be multiple
            // devices in this list if the user is currently screencasting with MyGlass. The
            // first one will always be the hardware touchpad.
            break;
        }
    }
}