我使用了自定义动画类来实现这个功能:
public class RadiusAnimation extends Animation {
private GroundOverlay groundOverlay;
private final int startingSize = 100;
public RadiusAnimation(GroundOverlay groundOverlay) {
this.groundOverlay = groundOverlay;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
groundOverlay.setDimensions((startingSize * interpolatedTime));
groundOverlay.setTransparency(interpolatedTime);
}
@Override
public void initialize(int width, int height, int parentWidth, int parentHeight) {
super.initialize(width, height, parentWidth, parentHeight);
}
}
然后在我的mapFragment中:
public class MapFragment extends Fragment implements OnMapReadyCallback {
private RadiusAnimation groundAnimation;
private AnimationSet breadingAnimations;
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
rippleBackground = new RippleBackground(getActivity());
rippleBackground.setBackgroundColor(ContextCompat.getColor(getActivity(),
R.color.pulseMarker1));
mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
breadingAnimations = new AnimationSet(false);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
//Add smallest image drawable overlay
Bitmap mDotMarkerBitmap1 = generateBitmapFromDrawable(R.drawable.circle_drawable);
final int widthOne = 80;
final int animationDurationOne = 1200;
GroundOverlay groundOverlay1 = mMap.addGroundOverlay(new GroundOverlayOptions()
.image(BitmapDescriptorFactory.fromBitmap(mDotMarkerBitmap1))
.position(xDesign, widthOne));
groundAnimation = new RadiusAnimation(groundOverlay1);
groundAnimation.setRepeatCount(Animation.INFINITE);
groundAnimation.setRepeatMode(Animation.RESTART);
groundAnimation.setDuration(animationDurationOne);
// groundAnimation.setStartOffset(700);
breadingAnimations.addAnimation(groundAnimation);
Bitmap mDotMarkerBitmap2 = generateBitmapFromDrawable(R.drawable.circle_drawable2);
final int widthTwo = 200;
final int animationDurationTwo = 2000;
GroundOverlay groundOverlay2 = mMap.addGroundOverlay(new GroundOverlayOptions()
.image(BitmapDescriptorFactory.fromBitmap(mDotMarkerBitmap2))
.position(xDesign, widthTwo));
Animation groundAnimation2 = new RadiusAnimation(groundOverlay2);
groundAnimation2.setRepeatCount(Animation.INFINITE);
groundAnimation2.setRepeatMode(Animation.RESTART);
groundAnimation2.setDuration(animationDurationTwo);
// groundAnimation2.setStartOffset(1500);
breadingAnimations.addAnimation(groundAnimation2);
Bitmap mDotMarkerBitmap3 = generateBitmapFromDrawable(R.drawable.circle_drawable3);
final int widthThree = 300;
final int animationDurationThree = 3000;
GroundOverlay groundOverlay3 = mMap.addGroundOverlay(new GroundOverlayOptions()
.image(BitmapDescriptorFactory.fromBitmap(mDotMarkerBitmap3))
.position(xDesign, widthThree));
Animation groundAnimation3 = new RadiusAnimation(groundOverlay3);
groundAnimation3.setRepeatCount(Animation.INFINITE);
groundAnimation3.setRepeatMode(Animation.RESTART);
// groundAnimation3.setStartOffset(500);
groundAnimation3.setDuration(animationDurationThree);
breadingAnimations.addAnimation(groundAnimation3);
mapFragment.getView().startAnimation(breadingAnimations); // start animation
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(xDesign, zoomLeval));
}
private void logThis(String message) {
Log.d(TAG, message);
}
@NonNull
private Bitmap generateBitmapFromDrawable(int drawablesRes) {
int px = getResources().getDimensionPixelSize(R.dimen.map_dot_marker_size);
Bitmap mDotMarkerBitmap = Bitmap.createBitmap(px, px, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(mDotMarkerBitmap);
Drawable shape = getResources().getDrawable(drawablesRes);
shape.setBounds(0, 0, mDotMarkerBitmap.getWidth(), mDotMarkerBitmap.getHeight());
shape.draw(canvas);
return mDotMarkerBitmap;
}
}