Timeline mission not work after takeoff,just hovering

djiuser_ReXrNeLbXwzl

I am going to use UXSDK and the timeline feature. So I tried some tests with a timeline on the UXSDK sample repository
Below is my timeline init function. When I start timeline, the drone takeoff, but not moving anymore. just it is hovering on the air
Please help me what is the problem with my code. Thanks

private void initTimeline() {

double baseLatitude = 22;
double baseLongitude = 113;
Object latitudeValue = KeyManager.getInstance().getValue((FlightControllerKey.create(HOME_LOCATION_LATITUDE)));
Object longitudeValue = KeyManager.getInstance().getValue((FlightControllerKey.create(HOME_LOCATION_LONGITUDE)));

if (latitudeValue != null && latitudeValue instanceof Double) {
      baseLatitude = (double) latitudeValue;
}
if (longitudeValue != null && longitudeValue instanceof Double) {
      baseLongitude = (double) longitudeValue;
}

List<TimelineElement> elements = new ArrayList<>();

missionControl = MissionControl.getInstance();

//Step 1: takeoff from the ground
elements.add(new TakeOffAction());

//Step 2: Go 1 meters from home point
elements.add(new GoToAction( 1));

//Step 3: reset the gimbal pitch to below of drone in 2 seconds
Attitude attitude = new Attitude(-90, Rotation.NO_ROTATION, Rotation.NO_ROTATION);
GimbalAttitudeAction gimbalAction = new GimbalAttitudeAction(attitude);
gimbalAction.setCompletionTime(2);
elements.add(gimbalAction);

//Step 4: shoot a single photo
elements.add(ShootPhotoAction.newShootSinglePhotoAction());

//Step 5: reset the gimbal pitch with 5 seconds delay
Attitude attitude_reset = new Attitude(0, Rotation.NO_ROTATION, Rotation.NO_ROTATION);
GimbalAttitudeAction gimbalAction_reset = new GimbalAttitudeAction(attitude_reset);
gimbalAction_reset.setCompletionTime(5);
elements.add(gimbalAction_reset);

//Step 6: fly forward 2 meters
elements.add(new GoToAction(new LocationCoordinate2D(baseLatitude + 2 * ONE_METER_OFFSET, baseLongitude), 1));

//Step 7: Set the gimbal yaw to right of drone in 2 seconds
Attitude attitude_right = new Attitude(Rotation.NO_ROTATION, Rotation.NO_ROTATION, 90);
GimbalAttitudeAction gimbalAction_right = new GimbalAttitudeAction(attitude_right);
gimbalAction.setCompletionTime(2);
elements.add(gimbalAction_right);

//Step 8: shoot a single photo
elements.add(ShootPhotoAction.newShootSinglePhotoAction());

//Step 9: Set the gimbal yaw to left of drone in 2 seconds
Attitude attitude_left = new Attitude(Rotation.NO_ROTATION, Rotation.NO_ROTATION, -90);
GimbalAttitudeAction gimbalAction_left = new GimbalAttitudeAction(attitude_left);
gimbalAction.setCompletionTime(2);
elements.add(gimbalAction_left);

//Step 10: shoot a single photo
elements.add(ShootPhotoAction.newShootSinglePhotoAction());

//Step 11: Land Drone
elements.add(new LandAction());

if (missionControl.scheduledCount() > 0) {
      missionControl.unscheduleEverything();
      missionControl.removeAllListeners();
}

missionControl.scheduleElements(elements);

View autoButton = findViewById(R.id.auto);
autoButton.setVisibility(View.VISIBLE);
}