[Fix] IOS will crash and change the gradient in Android.

[Cause] The app crashes in IOS because the default ratio is 0.0.

[Solution] Set the ratio default value to 1.0.

packages/google_maps_flutter/google_maps_flutter/android/src/main/java/io/flutter/plugins/googlemaps/MarkerIconPainter.java

@@ -145,7 +145,7 @@ public static Bitmap withSos(Bitmap avatar, float density) {
         Canvas canvas = new Canvas(output);
 
         Paint shadowPaint = new Paint();
-        shadowPaint.setShadowLayer(40.0f, 0.f, 0.f, Color.RED);
+        shadowPaint.setShadowLayer(20.0f, 0.f, 0.f, Color.RED);
         shadowPaint.setColor(Color.RED);
         RectF rectF = new RectF(new Rect(shadowSize + offset, shadowSize + offset, avatar.getWidth() + shadowSize - offset, avatar.getWidth() + shadowSize - offset));
         canvas.drawOval(rectF, shadowPaint);

packages/google_maps_flutter/google_maps_flutter/ios/Classes/GoogleMapController.m

@@ -411,7 +411,7 @@ - (void)onMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
               NSNumber* rideStatus = extra[@"rideStatus"];
               if (!rideStatus) rideStatus = [NSNumber numberWithInt:0];
               NSNumber* ratio = extra[@"ratio"];
-              if (!ratio) ratio = [NSNumber numberWithFloat:0.0];
+              if (!ratio) ratio = [NSNumber numberWithFloat:1.0];
               UIImage* image;
               if (path != nil && path != [NSNull null]) {
                   image = [_markerIconPainter getUIImageFromPath:path ratio:ratio];

packages/google_maps_flutter/google_maps_flutter/ios/Classes/MarkerIconPainter.m

@@ -180,26 +180,35 @@ - (UIImage*) withSos:(UIImage *)avatar ratio:(NSNumber *)ratio {
     CGPoint center = CGPointMake(iconSize / 2, iconSize / 2);
     float radius = iconSize / 2;
     CGRect ellipseRect = CGRectMake(0, 0, iconSize, iconSize);
-    
+
     UIGraphicsBeginImageContextWithOptions(CGSizeMake(iconSize, iconSize), NO, 0.0);
     CGContextRef context = UIGraphicsGetCurrentContext();
-    
+
     CGFloat colors[] = {
+        1.0, 0.0, 0.0, 0.0,
+        1.0, 0.0, 0.0, 0.1,
+        1.0, 0.0, 0.0, 0.15,
+        1.0, 0.0, 0.0, 0.2,
+        1.0, 0.0, 0.0, 0.25,
         1.0, 0.0, 0.0, 0.3,
-        1.0, 0.0, 0.0, 0.8,
+        1.0, 0.0, 0.0, 0.31,
+        1.0, 0.0, 0.0, 0.32,
+        1.0, 0.0, 0.0, 0.33,
+        1.0, 0.0, 0.0, 0.65,
+        1.0, 0.0, 0.0, 0.7,
     };
     CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
-    CGGradientRef gradientref = CGGradientCreateWithColorComponents(colorSpaceRef, colors, NULL, 2);
+    CGGradientRef gradientref = CGGradientCreateWithColorComponents(colorSpaceRef, colors, NULL, 11);
     CGContextAddEllipseInRect(context, ellipseRect);
     CGContextClip(context);
-    
+
     CGContextDrawRadialGradient(context, gradientref, center, radius, center, radius - shadowSize, kCGGradientDrawsAfterEndLocation);
-    
+
     [avatar drawInRect:CGRectMake(shadowSize, shadowSize, avatar.size.width, avatar.size.height)];
 
     UIImage* view = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();
-    
+
     return view;
 }