Question

我面临着真正的挑战，我希望你们能帮助我弄明白。我为给定的位置对象创建折线，并且我想要做的是在原点中放置一个自定义标记并使其在整个折线中移动，不一定跟踪位置，只是移动在折线上。

我的第一步是创建一个ObjectAnimation对象，让它从一个标记移动到另一个标记，但是我不知道如何让它沿着我的折线而不是一条线移动。 / p>

提前感谢您，以及您需要澄清问题的任何进一步信息，我每次都在查看此主题！

Answer 1

你在使用对象动画师时是正确的，你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);

标记在Mapbox中通过折线移动

1 个答案: