android.view.InputDevice.MotionRange#getAxis ( )源码实例Demo

@Override
public boolean onGenericMotion(View v, MotionEvent event) {
    if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0
            && event.getAction() == MotionEvent.ACTION_MOVE) {
        List<MotionRange> motionRanges = event.getDevice().getMotionRanges();
        for(MotionRange mr : motionRanges){
            int axis = mr.getAxis();
            if(event.getAxisValue(axis) > 0.5 || event.getAxisValue(axis) < -0.5){
                Log.i(TAG, "Axis found: " + MotionEvent.axisToString(axis));
                this.mAxisName = MotionEvent.axisToString(axis);
                mValueTextView.setText(mAxisName);
            }
        }
    }else{
        Log.i(TAG, "Not a joystick event.");
    }
    return true;
}
 

protected JoystickAxis addAxis(MotionRange motionRange) {

            String name = MotionEvent.axisToString(motionRange.getAxis());

            String original = MotionEvent.axisToString(motionRange.getAxis());
            if (motionRange.getAxis() == MotionEvent.AXIS_X) {
                original = JoystickAxis.X_AXIS;
            } else if (motionRange.getAxis() == MotionEvent.AXIS_Y) {
                original = JoystickAxis.Y_AXIS;
            } else if (motionRange.getAxis() == MotionEvent.AXIS_Z) {
                original = JoystickAxis.Z_AXIS;
            } else if (motionRange.getAxis() == MotionEvent.AXIS_RZ) {
                original = JoystickAxis.Z_ROTATION;
            } else if (motionRange.getAxis() == MotionEvent.AXIS_HAT_X) {
                original = JoystickAxis.POV_X;
            } else if (motionRange.getAxis() == MotionEvent.AXIS_HAT_Y) {
                original = JoystickAxis.POV_Y;
            }
            String logicalId = JoystickCompatibilityMappings.remapComponent( getName(), original );
            if( logicalId == null ? original != null : !logicalId.equals(original) ) {
                logger.log(Level.FINE, "Remapped: {0} to: {1}",
                        new Object[]{original, logicalId});
            }

            JoystickAxis axis = new DefaultJoystickAxis(getInputManager(),
                                                this,
                                                getAxisCount(),
                                                name,
                                                logicalId,
                                                true,
                                                true,
                                                motionRange.getFlat());

            if (motionRange.getAxis() == MotionEvent.AXIS_X) {
                xAxis = axis;
            }
            if (motionRange.getAxis() == MotionEvent.AXIS_Y) {
                yAxis = axis;
            }
            if (motionRange.getAxis() == MotionEvent.AXIS_HAT_X) {
                povX = axis;
            }
            if (motionRange.getAxis() == MotionEvent.AXIS_HAT_Y) {
                povY = axis;
            }

            addAxis(axis);
            axisIndex.put(motionRange.getAxis(), axis);
            return axis;
        }