问题描述
我正在android上编写一个应用程序,该应用程序将显示google maps中的地图.当我启动应用程序时,地图将以当前位置为中心.使用animateCamera
时,我可以看到整个世界的放大动画,直到它聚焦在当前位置为止.
I'm writing an application on android that will show a map from google maps. When I start the app, the map is centered on the current location. When I use animateCamera
, I can see the zoom-in animation from the whole world until it focuses on current location.
问题是我需要触摸地图才能以预期的缩放级别显示地图.
The problem is that I need to touch the map to get the map to display at the zoom level I expected.
这是我触摸屏幕之前得到的:触摸之前
Here is what I get before I touch the screen :Before touch
这是我触摸屏幕后得到的内容:触摸后
Here is what I get after having touch the screen :After touch
如果我触摸屏幕,图像将保持良好状态,直到我行驶几百米,然后再次无法使用.有时会出现图像,但每10公里仅显示1到2次.
If I touch the screen, the image will remain fine, until I drive a few hundred meters and then it's again unuseable. Sometimes the image appears, but it's only 1 or 2 times per 10km.
这是我在LocationListener::onLocationChanged
内移动相机的方式:
Here is how I move the camera inside LocationListener::onLocationChanged
:
float zoom = 19.0f;
LatLng target = new LatLng(location.getLatitude(), location.getLongitude());
// moving car marker
m_locationMarkerG.setPosition(target);
m_locationMarkerG.setRotation(location.getBearing());
// tilting camera depending on speed
float tilt = Math.min(90, location.getSpeed()*10);
m_mapViewG.animateCamera(CameraUpdateFactory.newCameraPosition(CameraPosition.builder().zoom(zoom).bearing(location.getBearing()).
target(target).tilt(tilt).build()));
我该怎么解决?
谢谢
推荐答案
找到的解决方案:
animateCamera.从另一个线程(传感器的线程)调用LocationListener.
animateCamera MUST be called from the main looper. The LocationListener is called from another thread (sensor's thread).
所以代码变成了:
final float zoom = 19.0f;
final LatLng target = new LatLng(location.getLatitude(), location.getLongitude());
// tilting camera depending on speed
final float tilt = Math.min(90, location.getSpeed()*10);
m_handler.post(new Runnable() {
public void run() {
// moving car marker
m_locationMarkerG.setPosition(target);
m_locationMarkerG.setRotation(location.getBearing());
// moving camera
m_mapViewG.animateCamera(CameraUpdateFactory.newCameraPosition(CameraPosition.builder().zoom(zoom).bearing(location.getBearing()).target(target).tilt(tilt).build()));
}
});
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