Jellybean 中的“谷歌地图”应用程序有一个指示器，可根据您面对的方式进行调整。我有兴趣实现一个类似的指标，但需要多个指标。
有没有人知道他们如何实现他们的航向指示器（请注意，即使在地图旋转时它也会保持航向）。我尝试使用标记自己的方法，然后我意识到标记不会随地图旋转（经过几个小时的劳动后有点哦……）
总结一下：如何在谷歌地图中实现一个基于标题而不是地图旋转的图标。
所以到目前为止，我看到了两种解决方案：
在我开始另一个兔子洞之前，有人可以提供任何建议吗？谢谢！
如果您想在地图上显示方向，您可以做几件事。
以下是使用的所有导入：
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
1.移动地图，使方位在顶部。
private final GoogleMap mMap;
//Get the current position from the map
CameraPosition camPosition = mMap.getCameraPosition();
//Update only the orientation/bearing, get all of the other values from the existing position.
CameraPosition newPos = new CameraPosition(
camPosition.target,
camPosition.zoom,
camPosition.tilt,
azimuthInDegress);
//Set the position so that the map will update. The desired heading should not be on top
mMap.moveCamera(CameraUpdateFactory.newCameraPosition(newPos));
这个想法的问题是，如果你不稳定你的方向更新，地图就会到处移动。
2.实现一个LocationSource
谷歌地图让你能够覆盖它的位置提供者。首先，您需要实现一个新的 Location 源：
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.LocationSource;
import com.google.android.gms.maps.MapFragment;
public class LocationSourceImplActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Assume using the example from Google
GoogleMap map = ((MapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
map.setMyLocationEnabled(true);
LocationManager locManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
map.setLocationSource(new LocationSourceImpl(locManager));
}
/**
*The Goal of this class is to listen for both location and heading updates
*and combine these into a single update, which will be passed to Google Maps.
*/
private class LocationSourceImpl implements LocationSource, LocationListener {
private OnLocationChangedListener mListener = null;
private Location mLastLoc = null;
//Use your desired location provider. You can also update this class to better
//determine when and how to register
private static final String PREF_LOC_SRC ="";
private final LocationManager mLocationManager;
private float mLastHeading = Float.MAX_VALUE;
public LocationSourceImpl(LocationManager pLocManager) {
mLocationManager = pLocManager;
//Get all updates, modify as desired.
mLocationManager.requestLocationUpdates(PREF_LOC_SRC, 0, 0, this);
}
@Override
public void onLocationChanged(Location location) {
mLastLoc = location;
notifyListener();
}
private void notifyListener() {
if(mListener != null && mLastLoc!=null) {
if(mLastHeading != Float.MAX_VALUE) {
mLastLoc.setBearing(mLastHeading);
}
//The listener will be the maps:
mListener.onLocationChanged(mLastLoc);
}
}
@Override
public void activate(OnLocationChangedListener pListener) {
//When the setLocationSource is called on the map, the map
//will be passed in as an OnLocationChangedListener (may not be the
//map, but may be a delegator created by the map.
mListener = pListener;
}
@Override
public void deactivate() {
mListener = null;
}
/**
* This method can/should be replaced with a heading calculation
* @param pDegrees
* Heading in degrees
*/
public void updateHeadingInDegrees(float pDegrees) {
mLastHeading = pDegrees;
notifyListener();
}
@Override
public void onProviderDisabled(String paramString) {
}
@Override
public void onProviderEnabled(String paramString) {
}
@Override
public void onStatusChanged(String paramString, int paramInt,
Bundle paramBundle) {
}
}
}
这是使用指南针根据磁场获得您所面临的方向来完成的。请参阅此处了解不同的传感器
http://developer.android.com/guide/topics/sensors/sensors_overview.html
用这个。这是使用设备自己的传感器实现的。
而且您也想了解视图，我认为这是一个对您有帮助的示例http://android-er.blogspot.in/2010/08/simple-compass-sensormanager-and.html