我希望删除之前绘制的圆圈。当我搜索新地点时，第一个圆圈仍然存在，并且还绘制了新圆圈。基本上每当位置发生变化时，圆圈都会被绘制（相互重叠），而不会删除前一个圆圈。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_geocoding_maps);
toolbar=(Toolbar)findViewById(R.id.mapToolbar);if (!checkPlayServices()) {
Toast.makeText(this, "Device not compatible", Toast.LENGTH_SHORT).show();
finish();
}
Bundle extras=getIntent().getExtras();
if(extras==null)
{
itemAction=-1;
Log.w(TAG, "Extras are null");
finish();
}
else
{
try{
item=extras.getParcelable(GeofenceUtils.P_KEY);
}catch (Exception e)
{
Log.w(GeofenceUtils.getTag(), e.getMessage());
}
if (item != null) {
if(item.getLatitude()==0.0&&item.getLongitude()==0.0) {
//New item
itemAction=0;
}
else {
//Update item
Log.w(TAG, "Title : "+item.getTitle());
itemAction=1;
}
Log.w(TAG, "Item Action: "+itemAction);
}
else {
Log.w(TAG, "Item null: ");
}
}
dbHelper=GeofenceDBHelper.getInstance(this);
assert toolbar != null;
toolbar.setTitle("Pick a location");
toolbar.setTitleTextColor(Color.WHITE);
setSupportActionBar(toolbar);
address="";
addressText = (EditText) findViewById(R.id.addressText);
if(itemAction==1) {
address=item.getAddress();
if (addressText != null) {
addressText.setText(address);
}
}
addressText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_SEARCH) {
Log.w(TAG, "onEditorAction");
address = addressText.getText().toString();
LatLng latLng = getLocationFromAddress(GeocodingMapsActivity.this, address);
if (latLng != null) {
mlatitude = latLng.latitude;
mlongitude = latLng.longitude;
marker.setPosition(latLng);//match this behavior to your 'Send' (or Confirm) button
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 18);
mMap.animateCamera(cameraUpdate);
circle = drawCircle(new LatLng(mlatitude, mlongitude));
} else {
Log.w(TAG, "onEditorAction: address null");
}
}
return false;
}
});
if(savedInstanceState!=null)
{
//For handling screen rotations
mlatitude=savedInstanceState.getDouble("Latitude");
mlongitude=savedInstanceState.getDouble("Longitude");
Log.w(TAG, "itemAction savedInstanceState: "+itemAction);
}
else
{
mlatitude=item.getLatitude();
mlongitude=item.getLongitude();
}
clearButton=(ImageButton)findViewById(R.id.clear_text);
clearButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addressText.setText("");
}
});
MyLocationButton=(FloatingActionButton)findViewById(R.id.fab);
MyLocationButton.setBackgroundTintList(ColorStateList.valueOf(Color.WHITE));
MyLocationButton.setRippleColor(Color.parseColor("#f5f5f5"));
MyLocationButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mGoogleApiClient.isConnected()) {
LatLng latLng = getCurrentLocation();
if (latLng != null) {
setAddress();
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 18);
mMap.animateCamera(cameraUpdate);
// circle = drawCircle(new LatLng(mlatitude, mlongitude));
}
}
}
});
MyLocationButton.setVisibility(View.GONE);
mGeofenceList=new ArrayList<>();
buildGoogleApiClient();
createLocationRequest();
buildLocationSettingsRequest();
checkLocationSettings();
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
Log.w(TAG, "onCreate");
}
private void removeEverything(){
marker.remove();
marker = null;
circle.remove();
circle = null;
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
Circle circle;
@Override
public void onMapReady(GoogleMap googleMap) {
Log.w(TAG, "onMapReady1");
mMap = googleMap;
// mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
enableMyLocation();
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
marker.setPosition(latLng);
mlatitude=latLng.latitude;
mlongitude=latLng.longitude;
setAddress();
}
});
Log.w(TAG, "onMapReady2");
LatLng mLocation=null;
if(mGoogleApiClient.isConnected()&&itemAction==0)
mLocation = getCurrentLocation();
Log.w(TAG, "onMapReady3");
if (itemAction==0&&mLocation != null) {
mlatitude = mLocation.latitude;
mlongitude = mLocation.longitude;
}
else if(itemAction==1) {
mLocation=new LatLng(mlatitude, mlongitude);
}
else
mLocation = new LatLng(0.0, 0.0);
Log.w(TAG, "onMapReady3");
if(mGoogleApiClient.isConnected())
setAddress();
Log.w(TAG, "onMapReady4");
marker = mMap.addMarker(new MarkerOptions().position(mLocation).draggable(true));
Log.w(GeofenceUtils.getTag(), item.getMarkerColor()+"");
marker.setIcon(BitmapDescriptorFactory.fromResource(GeofenceUtils.getMarker(item.getMarkerColor())));
mMap.setOnMarkerDragListener(this);
if(itemAction==1)
{
CameraUpdate cameraUpdate=CameraUpdateFactory.newLatLngZoom(new LatLng(item.getLatitude(), item.getLongitude()), 18);
CameraUpdateFactory.newLatLngZoom(mLocation, 18);
mMap.animateCamera(cameraUpdate);
// circle = drawCircle(new LatLng(mlatitude, mlongitude));
}
Log.w(TAG, "onMapReady5");
}
private Circle drawCircle(LatLng latLng) {
CircleOptions options = new CircleOptions()
.center(latLng)
.radius(50)
.strokeColor(Color.BLACK)
.fillColor(Color.rgb( 229, 204, 229))
.strokeWidth(3);
return mMap.addCircle(options);
}
答案 0 :(得分：0)
private Circle circle;
在将圆绘制到地图之前。首先检查是否绘制了圆。只需删除圆圈，然后在地图上绘制新圆圈。
if(circle!=null){
circle.remove();
}
circle = drawCircle(new LatLng(mlatitude, mlongitude));