【问题讨论】：
GroundOverlay “这不是一个选项。” ?
标签： android google-maps
Ben P 在他的评论中是正确的：“标记不会根据缩放改变大小”。但是，可以通过在（例如）onCameraIdle() 中为每个缩放级别删除并重新创建具有自定义图标大小的标记来实现此标记行为。与：
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {
private static final String TAG = MainActivity.class.getSimpleName();
private static final int DIAMETER_IN_METERS = 300;
private final LatLng MARKER_LOCATION = new LatLng(37.762555, -122.244221);
private GoogleMap mGoogleMap;
private MapFragment mMapFragment;
private Marker mMarker = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map_fragment);
mMapFragment.getMapAsync(this);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
mGoogleMap.setOnCameraIdleListener(new GoogleMap.OnCameraIdleListener() {
@Override
public void onCameraIdle() {
if (mMarker != null) {
mMarker.remove();
}
mMarker = createResizedMarker(MARKER_LOCATION);
}
});
mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(MARKER_LOCATION, 16));
}
private Marker createResizedMarker(LatLng marker_location) {
// get vector drawable
final Drawable iconDrawable = getResources().getDrawable(R.drawable.ic_letter_m);
// calc map resolution (meters per pixel) for current zoom level for details see e.g. https://msdn.microsoft.com/en-us/library/aa940990.aspx
final double meters_per_pixel = (Math.cos(mGoogleMap.getCameraPosition().target.latitude * Math.PI / 180) * 2 * Math.PI * 6378137) / (256 * Math.pow(2, mGoogleMap.getCameraPosition().zoom));
// calc marker icon diameter in pixels
final int diameter = (int)(DIAMETER_IN_METERS / meters_per_pixel);
// create marker icon bitmap for current scale
final Bitmap bitmap = Bitmap.createBitmap(diameter, diameter, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
iconDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
iconDrawable.draw(canvas);
Marker marker = mGoogleMap.addMarker(new MarkerOptions()
.position(MARKER_LOCATION)
.anchor(0.5f, 0.5f)
.icon(BitmapDescriptorFactory.fromBitmap(bitmap)));
return marker;
}
}
和R.drawable.ic_letter_m - xml 可绘制矢量（用于完美缩放），例如：
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="512dp"
android:height="512dp"
android:viewportWidth="512"
android:viewportHeight="512">
<path
android:name="canvas_background"
android:pathData="M -1 -1 H 581 V 401 H -1 V -1 Z" />
<path
android:name="SVGCleanerId_0"
android:fillColor="#54BBFF"
android:pathData="M256,0l-61.811005,256l61.811005,256c141.384979,0 256,-114.61499
256,-256s-114.61499,-256 -256,-256z" />
<path
android:name="SVGCleanerId_1"
android:fillColor="#8DD2FF"
android:pathData="M0,256c0,141.384979 114.614998,256 256,256l0,-512c-141.385002,0 -256,114.614998
-256,256z" />
<path
android:name="svg_1"
android:fillColor="#C6E8FF"
android:pathData="M256,30.905001l0,450.188993c124.31601,0 225.095001,-100.777985
225.095001,-225.095001s-100.778992,-225.093992 -225.095001,-225.093992z" />
<path
android:name="svg_2"
android:fillColor="#FFFFFF"
android:pathData="M450.188995,256c0,-124.315994 -86.94101,-225.094999
-194.188995,-225.094999c-124.315994,0 -225.094999,100.779005
-225.094999,225.094999s100.779005,225.095001 225.094999,225.095001c107.247986,0
194.188995,-100.778992 194.188995,-225.095001z" />
<path
android:name="svg_3"
android:fillColor="#54BBFF"
android:pathData="M306.993988,395.589996c-11.378998,0 -20.604004,-9.223999
-20.604004,-20.604004l0,-137.592987l-11.453003,26.722992c-3.246002,7.576019
-10.694977,12.488007 -18.937988,12.488007c-8.240997,0 -15.69101,-4.912018
-18.938004,-12.488007l-11.453003,-26.722992l0,137.593018c0,11.378998
-9.223999,20.603973 -20.604004,20.603973c-11.378998,0 -20.603989,-9.223999
-20.603989,-20.603973l0,-237.972015c0,-9.782997 6.878998,-18.215996
16.460999,-20.182999c9.584,-1.968002 19.227005,3.075005
23.080002,12.065994l32.059006,74.798004l32.056,-74.796997c3.852997,-8.990997
13.502014,-14.032997 23.079987,-12.066002c9.583008,1.968002 16.460999,10.401001
16.460999,20.183006l0,237.971985c0.001007,11.377991 -9.223999,20.602997
-20.602997,20.602997z" />
<path
android:name="SVGCleanerId_0_1_"
android:fillColor="#F655A0"
android:pathData="M256,0l-61.811005,256l61.811005,256c141.384979,0 256,-114.61499
256,-256s-114.61499,-256 -256,-256z" />
<path
android:name="SVGCleanerId_1_1_"
android:fillColor="#F655A0"
android:pathData="M0,256c0,141.384979 114.614998,256 256,256l0,-512c-141.385002,0 -256,114.614998
-256,256z" />
<path
android:name="svg_8"
android:fillColor="#FFFFFF"
android:pathData="M335.771271,393.589996c-17.577087,0 -31.826935,-9.223999
-31.826935,-20.604004l0,-137.592987l-17.691406,26.722992c-5.014069,7.576019
-16.520477,12.488007 -29.253418,12.488007c-12.729828,0 -24.237839,-4.912018
-29.253448,-12.488007l-17.691406,-26.722992l0,137.593018c0,11.378998
-14.248276,20.603973 -31.82692,20.603973c-17.577087,0 -31.826889,-9.223999
-31.826889,-20.603973l0,-237.972015c0,-9.782997 10.625946,-18.215996
25.427231,-20.182999c14.804367,-1.968002 29.699875,3.075005
35.651581,12.065994l49.521408,74.798004l49.516754,-74.796997c5.951721,-8.990997
20.856506,-14.032997 35.651581,-12.066002c14.802826,1.968002 25.427216,10.401001
25.427216,20.183006l0,237.971985c0.001556,11.377991 -14.24826,20.602997
-31.825348,20.602997z" />
</vector>
你得到了类似的东西：
但实际上，Ground Overlay 可以直接完成所有工作。使用地面覆盖物来完成这样的任务确实更好（至少为了更好的性能和平滑的缩放）。如果你需要，例如如果您需要绘制汽车运动，您可以随时重新创建地面叠加层（使用不同的位图或位图大小，如上面的标记）。您还可以使用.setBearing() 旋转地面覆盖物，如标记。
【讨论】：
我遇到了同样的问题，使用以下代码作为解决方案。您可以将以下代码用于固定大小的标记。在我的研究中，我们只有位图选项。
int height = 100;
int width = 100;
BitmapDrawable bitmapdraw=(BitmapDrawable)getResources().getDrawable(R.mipmap.marker);
Bitmap b=bitmapdraw.getBitmap();
Bitmap smallMarker = Bitmap.createScaledBitmap(b, width, height, false);
要添加市场，请使用以下代码：
gMap.addMarker(new MarkerOptions()
.position(POSITION)
.title("Title")
.icon(BitmapDescriptorFactory.fromBitmap(smallMarker))
);
【讨论】：