android - 标记在 Mapbox 中通过折线移动

Question

我面临着一个真正的挑战，我希望你们能帮助我弄清楚。我正在为给定的 Position 对象创建一条折线，我想要做的是在原点放置一个自定义标记并使其在折线上移动，不一定跟踪位置，只是在折线上移动。

我的第一步是创建一个 ObjectAnimation 对象，并让它在一条线上从一个标记移动到另一个标记，但我不知道如何让它沿着我的折线而不是一条线移动。

提前谢谢你们，你们需要任何进一步的信息来澄清这个问题，我每次都在看这个话题！

Answer 1

我们有一个例子

您使用对象动画师是正确的，您还需要使用处理程序来不断更新位置。

// Animating the marker requires the use of both the ValueAnimator and a handler.
    // The ValueAnimator is used to move the marker between the GeoJSON points, this is
    // done linearly. The handler is used to move the marker along the GeoJSON points.
    handler = new Handler();
    runnable = new Runnable() {
      @Override
      public void run() {

        // Check if we are at the end of the points list, if so we want to stop using
        // the handler.
        if ((points.size() - 1) > count) {

          // Calculating the distance is done between the current point and next.
          // This gives us the duration we will need to execute the ValueAnimator.
          // Multiplying by ten is done to slow down the marker speed. Adjusting
          // this value will result in the marker traversing faster or slower along
          // the line
          distance = (long) marker.getPosition().distanceTo(points.get(count)) * 10;

          // animate the marker from it's current position to the next point in the
          // points list.
          ValueAnimator markerAnimator = ObjectAnimator.ofObject(marker, "position",
              new LatLngEvaluator(), marker.getPosition(), points.get(count));
          markerAnimator.setDuration(distance);
          markerAnimator.setInterpolator(new LinearInterpolator());
          markerAnimator.start();

          // This line will make sure the marker appears when it is being animated
          // and starts outside the current user view. Without this, the user must
          // intentionally execute a gesture before the view marker reappears on
          // the map.
          map.getMarkerViewManager().update();

          // Keeping the current point count we are on.
          count++;

          // Once we finish we need to repeat the entire process by executing the
          // handler again once the ValueAnimator is finished.
          handler.postDelayed(this, distance);
        }
      }
    };
    handler.post(runnable);