在我的案例中，我遵循此链接How to create the radar animation at the center of Google Map?的问题是动画无法正常工作，并且标记上出现了一些静态圆圈。标记上仅显示圆圈，没有动画。我已经按照我遵循的准则对代码进行了交叉检查，没有区别。如果我错过了一些重要的事情，这些事情会限制我的代码正常工作，请提供指导。
这是MapsActivity
为简单起见，我在描述基本流程。 我将RadarView的实例声明为mapRadar，然后在onCreate（）中实例化它。在onMapReady中，调用goToLocationZoom来设置标记位置。在goToLocationZoom内部，我调用了RadarView类的startAnimation方法。
public class MapsActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener{
private GoogleMap mMap;
protected GoogleApiClient mGoogleApiClient;
//MapRipple mapRipple;
private RadarView mapRadar;
EditText locationEditText,radiusEditText;
// parameters for geofence///
public static String locationKeyName="Eziline Software House";
public static double latitude=33.603559;
public static double longitude=73.026470;
public static int radius=20;
public static long geofenceExpiration=12 * 60 * 60 * 1000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
mapRadar=new RadarView(this);
locationEditText=(EditText)findViewById(R.id.et_place);
radiusEditText=(EditText)findViewById(R.id.et_radius);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
if(googlePayServicesAvailable()){
Toast.makeText(this, "Perfect!!!", Toast.LENGTH_LONG).show();
}
// default feofence parameters//
locationKeyName="Eziline Software House";
latitude=33.603559; longitude=73.026470;
radius=20;
geofenceExpiration=12 * 60 * 60 * 1000;
MapFragment mapFragment = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map);
Toast.makeText(this, " mapFragment Perfect!!!", Toast.LENGTH_LONG).show();
mapFragment.getMapAsync(this);
}
public boolean googlePayServicesAvailable(){
GoogleApiAvailability api=GoogleApiAvailability.getInstance();
int isAvailable=api.isGooglePlayServicesAvailable(this);
if(isAvailable== ConnectionResult.SUCCESS){
return true;
}
else if(api.isUserResolvableError(isAvailable)){
Dialog dialog=api.getErrorDialog(this,isAvailable,0);
dialog.show();
}
else {
Toast.makeText(this, "Cann't connect to play services", Toast.LENGTH_LONG).show();
}
return false;
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
locationEditText.setText("Eziline Software House Pvt. Ltd.");
radiusEditText.setText(20+"");
// Add a marker in Sydney and move the camera
try {
goToLocationZoom(33.603559, 73.026470, 15, "Eziline Software House Pvt. Ltd.");
Toast.makeText(this, "go to location zoom Perfect!!!", Toast.LENGTH_LONG).show();
}
catch (Exception e){
Toast.makeText(this, "Exception "+e, Toast.LENGTH_LONG).show();
}
mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
@Override
public void onMapLongClick(LatLng latLng) {
Geocoder gc=new Geocoder(MapsActivity.this);
double lat=latLng.latitude;double lng=latLng.longitude;
List<Address> list = null;
try {
list = gc.getFromLocation(lat, lng,1);
} catch (IOException e) {
e.printStackTrace();
}
Address address = list.get(0);
final String locality = address.getLocality();
Toast.makeText(getApplicationContext(), "Location "+locality, Toast.LENGTH_LONG).show();
goToLocationZoom(lat,lng,15,locality);
locationEditText.setText(locality);
}
});
mMap.setOnMarkerDragListener(new GoogleMap.OnMarkerDragListener() {
@Override
public void onMarkerDragStart(Marker marker) {
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
Geocoder gc = new Geocoder(MapsActivity.this);
LatLng ll=marker.getPosition();
double lat=ll.latitude;double lng=ll.longitude;
List<Address> list = null;
try {
list = gc.getFromLocation(lat, lng,1);
} catch (IOException e) {
e.printStackTrace();
}
Address address = list.get(0);
final String locality = address.getLocality();
marker.setTitle(locality);
//drawCircle(new LatLng(lat,lng));
locationEditText.setText(locality);
if(TextUtils.isEmpty(radiusEditText.getText())){
radiusEditText.setText(radius+"");
}
}
});
/**mMap.setMyLocationEnabled(true);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();**/
}
Marker marker=null;
private void setMarker(double lat,double lng, String location){
if(marker!=null){
marker.remove();
}
marker.setDraggable(true);
MarkerOptions markerOptions= new MarkerOptions();
markerOptions.title(location).position(new LatLng(lat,lng)).snippet("Here You're");
marker= mMap.addMarker(markerOptions);
}
public
Circle circle=null;
private void drawCircle(LatLng latLng){
if(circle!=null){
circle.remove();
}
CircleOptions options= new CircleOptions().center(latLng).fillColor(0x33FF0000).strokeColor(Color.BLUE).strokeWidth(3).radius(Integer.parseInt(radiusEditText.getText().toString()));
circle=mMap.addCircle(options);
}
public void geoLocate(View view)throws Exception{
if(TextUtils.isEmpty(locationEditText.getText())){
locationEditText.setError("Location can't be empty");
return;
}
else if(TextUtils.isEmpty(radiusEditText.getText())){
radiusEditText.setError("Radius can't be empty");
return;
}
else {
final String location = locationEditText.getText().toString();
final int rad=Integer.parseInt(radiusEditText.getText().toString());
Geocoder gc = new Geocoder(this);
List<Address> list=null;
try {
list = gc.getFromLocationName(location, 1);
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(this, "No Location matched. Kindly check your internet connection or enter correct location", Toast.LENGTH_LONG).show();
return;
}
//List<Address> list = gc.getFromLocationName(location, 1);
Address address = list.get(0);
final String locality = address.getLocality();
Toast.makeText(this, locality, Toast.LENGTH_SHORT).show();
final double lat = address.getLatitude();
final double lng = address.getLongitude();
final LatLng locLatlng = new LatLng(lat, lng);
AlertDialog.Builder alertDialog= new AlertDialog.Builder(this)
.setTitle("Confirmation")
.setMessage("Do you want to set a geofence of Radius: "+radiusEditText.getText()+" at Location: "+locationEditText.getText())
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
latitude=lat;longitude=lng;
radius=rad;
locationKeyName=locality;
goToLocationZoom(lat, lng, 15, location);
//drawCircle(locLatlng);
dialog.dismiss();
}
}).setNegativeButton("No",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog = alertDialog.create();
dialog.show();
}
}
public void setLongLatGeofence(View view)throws Exception{
final Dialog dialog=new Dialog(this);
dialog.setContentView(R.layout.dialog_set_latlong_geofence);
dialog.setTitle("Custom Dimensions");
final EditText latEditText=(EditText)dialog.findViewById(R.id.et_lat);
final EditText longEditText=(EditText)dialog.findViewById(R.id.et_lng);
final EditText radEditText=(EditText)dialog.findViewById(R.id.et_rad);
Button setButton=(Button)dialog.findViewById(R.id.btn_set_geofence);
setButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try{
if(TextUtils.isEmpty(latEditText.getText())){
latEditText.setError("Latitude can't be empty");
return;
}
else if(TextUtils.isEmpty(longEditText.getText())){
longEditText.setError("Latitude can't be empty");
return;
}
else if(TextUtils.isEmpty(radEditText.getText())){
radEditText.setError("Radius can't be empty");
return;
}
else {
try {
final double lat = Double.parseDouble(latEditText.getText().toString().trim());
final double lng= Double.parseDouble(longEditText.getText().toString().trim());
final int rad=Integer.parseInt(radEditText.getText().toString().trim());
Geocoder gc = new Geocoder(getApplicationContext());
List<Address> list=null;
LatLng latLng=new LatLng(lat,lng);
list = gc.getFromLocation(33.8785834,73.7549315, 1);
Address address = list.get(0);
final String locality = address.getLocality();
latitude=lat;longitude=lng;
radius=rad;
locationKeyName=locality;
locationEditText.setText(locality);
radiusEditText.setText(rad);
goToLocationZoom(lat, lng, 15, locality);
dialog.dismiss();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Exception "+e, Toast.LENGTH_SHORT).show();
return;
}
//List<Address> list = gc.getFromLocationName(location, 1);
}
}catch (Exception e ){
Toast.makeText(getApplicationContext(), "Location Not Found or check your internet connection "+e, Toast.LENGTH_SHORT).show();
//Toast.makeText(getApplicationContext(), "No Location matched. Kindly check your internet connection or enter correct location", Toast.LENGTH_LONG).show();
return;
}
}
});
dialog.show();
}
public void goToLocationZoom(double lat, double lng, float zoom, String location){
LatLng sydney = new LatLng(lat, lng);
if(marker!=null){
marker.remove();
}
//marker.setDraggable(true);
marker= mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in "+location).snippet("Here You're"));
//setMarker(lat,lng,location);
//drawCircle(sydney);
//// marker draw circles for radar type animation/////
mapRadar.setShowCircles(true);
if (mapRadar!= null) {
mapRadar.startAnimation();
}
else{
Toast.makeText(this, "mapRadar=null", Toast.LENGTH_SHORT).show();
}
////////////////////////////////////////////
if(circle!=null){
circle.remove();
}
CircleOptions options= new CircleOptions().center(sydney).fillColor(0x33FF0000).strokeColor(Color.BLUE).strokeWidth(3).radius(Integer.parseInt(radiusEditText.getText().toString()));
circle=mMap.addCircle(options);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney,zoom));
}
LocationRequest mLocationRequest;
@Override
public void onConnected(Bundle bundle) {
mLocationRequest=LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(1000);
if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.M){
if(checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION)!= PackageManager.PERMISSION_GRANTED){
return;
}
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,mLocationRequest, (com.google.android.gms.location.LocationListener) this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
if(location==null){
Toast.makeText(this, "Can't get current location", Toast.LENGTH_SHORT).show();
}
else{
LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
if(marker!=null){
marker.remove();
}
marker=mMap.addMarker(new MarkerOptions().position(loc).title("Current Location"));
//setMarker(location.getLatitude(),location.getLongitude(),"Current Location");
CircleOptions options= new CircleOptions().center(loc).fillColor(0x33FF0000).strokeColor(Color.BLUE).strokeWidth(3).radius(Integer.parseInt(radiusEditText.getText().toString()));
if(circle!=null){
circle.remove();
}
circle=mMap.addCircle(options);
//drawCircle(loc);
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(loc,15));
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
protected void onStop(){
super.onStop();
}
}
here is RadarView class
public class RadarView extends View {
private final String LOG = "RadarView";
private final int POINT_ARRAY_SIZE = 25;
float alpha = 0;
Point latestPoint[] = new Point[POINT_ARRAY_SIZE];
Paint latestPaint[] = new Paint[POINT_ARRAY_SIZE];
android.os.Handler mHandler = new android.os.Handler();
private int fps = 100;
Runnable mTick = new Runnable() {
@Override
public void run() {
invalidate();
mHandler.postDelayed(this, 1000 / fps);
}
};
private boolean showCircles = true;
public RadarView(Context context) {
this(context, null);
}
public RadarView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RadarView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
Paint localPaint = new Paint();
localPaint.setColor(getResources().getColor(R.color.colorPrimary));
localPaint.setAntiAlias(true);
localPaint.setStyle(Paint.Style.STROKE);
localPaint.setStrokeWidth(1.0F);
localPaint.setAlpha(0);
int alpha_step = 255 / POINT_ARRAY_SIZE;
for (int i = 0; i < latestPaint.length; i++) {
latestPaint[i] = new Paint(localPaint);
latestPaint[i].setAlpha(255 - (i * alpha_step));
}
}
public void startAnimation() {
mHandler.removeCallbacks(mTick);
mHandler.post(mTick);
}
public void stopAnimation() {
mHandler.removeCallbacks(mTick);
}
public int getFrameRate() {
return this.fps;
}
public void setFrameRate(int fps) {
this.fps = fps;
}
;
public void setShowCircles(boolean showCircles) {
this.showCircles = showCircles;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int width = getWidth();
int height = getHeight();
int r = Math.min(width, height);
//canvas.drawRect(0, 0, getWidth(), getHeight(), localPaint);
int i = r / 2;
int j = i - 1;
Paint localPaint = latestPaint[0]; // GREEN
if (showCircles) {
canvas.drawCircle(i, i, j, localPaint);
canvas.drawCircle(i, i, j, localPaint);
canvas.drawCircle(i, i, j * 3 / 4, localPaint);
canvas.drawCircle(i, i, j >> 1, localPaint);
canvas.drawCircle(i, i, j >> 2, localPaint);
}
alpha -= 0.5;
if (alpha < -360) alpha = 0;
double angle = Math.toRadians(alpha);
int offsetX = (int) (i + (float) (i * Math.cos(angle)));
int offsetY = (int) (i - (float) (i * Math.sin(angle)));
latestPoint[0] = new Point(offsetX, offsetY);
for (int x = POINT_ARRAY_SIZE - 1; x > 0; x--) {
latestPoint[x] = latestPoint[x - 1];
}
int lines = 0;
for (int x = 0; x < POINT_ARRAY_SIZE; x++) {
Point point = latestPoint[x];
if (point != null) {
canvas.drawLine(i, i, point.x, point.y, latestPaint[x]);
}
}
lines = 0;
for (Point p : latestPoint) if (p != null) lines++;
boolean debug = false;
if (debug) {
StringBuilder sb = new StringBuilder(" >> ");
for (Point p : latestPoint) {
if (p != null) sb.append(" (" + p.x + "x" + p.y + ")");
}
Log.d(LOG, sb.toString());
// " - R:" + r + ", i=" + i +
// " - Size: " + width + "x" + height +
// " - Angle: " + angle +
// " - Offset: " + offsetX + "," + offsetY);
}
}
}
activity_maps.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.saba.geogooglemap.MapsActivity"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:orientation="horizontal"
android:layout_margin="10dp">
<EditText
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="match_parent"
android:id="@+id/et_place"
android:hint="Location"
android:textSize="15sp"
android:layout_marginRight="5dp"
android:textColor="@color/textColor"
android:tooltipText="Geofence central location"/>
<EditText
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:id="@+id/et_radius"
android:hint="Radius im meters"
android:textSize="15sp"
android:textColor="@color/textColor"
android:inputType="number"
android:maxLength="4"
android:tooltipText="Geofence radiud in meters"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_set"
android:text="Set Geofence"
android:onClick="geoLocate"
android:layout_gravity="center"
android:background="@color/textColor"
android:textColor="@color/white_color"
android:layout_marginBottom="5dp"
android:textAppearance="?android:attr/textAppearanceSmall"
android:padding="5dp"
android:layout_marginRight="8dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_latlong"
android:text="Custom Dimensions"
android:onClick="setLongLatGeofence"
android:layout_gravity="center"
android:background="@color/textColor"
android:textColor="@color/white_color"
android:layout_marginBottom="5dp"
android:textAppearance="?android:attr/textAppearanceSmall"
android:padding="5dp"/>
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="3"
android:layout_above="@+id/bootomLayout">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="8dp"
android:name="com.google.android.gms.maps.MapFragment"
android:id="@+id/map"/>
<com.example.saba.geogooglemap.RadarView
android:id="@+id/radarView"
android:layout_width="240dp"
android:layout_height="240dp"
android:layout_centerInParent="true"
/>
</RelativeLayout>
</LinearLayout>