diff --git a/library/src/main/java/com/onlylemi/mapview/library/MapView.java b/library/src/main/java/com/onlylemi/mapview/library/MapView.java
index 1e48601c7ee458c42db4faf787dc84c1dd7ad130..1d3d8d88cb97f8ac7e536671c1fdd08281941e7c 100644
--- a/library/src/main/java/com/onlylemi/mapview/library/MapView.java
+++ b/library/src/main/java/com/onlylemi/mapview/library/MapView.java
@@ -365,8 +365,8 @@ public class MapView extends SurfaceProvider implements SurfaceOps.Callback, Com
         float[] goal = {x, y};
         currentMatrix.mapPoints(goal);
 
-        float deltaX = getWidth() / 2 - goal[0];
-        float deltaY = getHeight() / 2 - goal[1];
+        float deltaX = (float) getWidth() / 2 - goal[0];
+        float deltaY = (float) getHeight() / 2 - goal[1];
         currentMatrix.postTranslate(deltaX, deltaY);
     }
 
@@ -381,7 +381,7 @@ public class MapView extends SurfaceProvider implements SurfaceOps.Callback, Com
      */
     public void setCurrentRotateDegrees(float degrees) {
         mapCenterWithPoint(getMapWidth() / 2, getMapHeight() / 2);
-        setCurrentRotateDegrees(degrees, getWidth() / 2, getHeight() / 2);
+        setCurrentRotateDegrees(degrees, (float) getWidth() / 2, (float) getHeight() / 2);
     }
 
     /**
@@ -450,7 +450,7 @@ public class MapView extends SurfaceProvider implements SurfaceOps.Callback, Com
      * @param zoom
      */
     public void setCurrentZoom(float zoom) {
-        setCurrentZoom(zoom, getWidth() / 2, getHeight() / 2);
+        setCurrentZoom(zoom, (float) getWidth() / 2, (float) getHeight() / 2);
     }
 
     /**
diff --git a/library/src/main/java/com/onlylemi/mapview/library/layer/BitmapLayer.java b/library/src/main/java/com/onlylemi/mapview/library/layer/BitmapLayer.java
index f1e9f1ebf3c2fddd4f92b01e584041dee0002d02..c00700262c2c1d612b60561dd89b90688daf48de 100644
--- a/library/src/main/java/com/onlylemi/mapview/library/layer/BitmapLayer.java
+++ b/library/src/main/java/com/onlylemi/mapview/library/layer/BitmapLayer.java
@@ -41,10 +41,10 @@ public class BitmapLayer extends MapBaseLayer {
         if (onBitmapClickListener != null) {
             float[] goal = mapView.convertMapXYToScreenXY(
                     event.getPointerPosition(0).getX(), event.getPointerPosition(0).getY());
-            if (goal[0] > location.getPointX() - bitmap.getImageInfo().size.width / 2
-                    && goal[0] < location.getPointX() + bitmap.getImageInfo().size.width / 2
-                    && goal[1] > location.getPointY() - bitmap.getImageInfo().size.height / 2
-                    && goal[1] < location.getPointY() + bitmap.getImageInfo().size.height / 2) {
+            if (goal[0] > location.getPointX() - (float) bitmap.getImageInfo().size.width / 2
+                    && goal[0] < location.getPointX() + (float) bitmap.getImageInfo().size.width / 2
+                    && goal[1] > location.getPointY() - (float) bitmap.getImageInfo().size.height / 2
+                    && goal[1] < location.getPointY() + (float) bitmap.getImageInfo().size.height / 2) {
                 onBitmapClickListener.onBitmapClick(this);
             }
         }
@@ -61,8 +61,8 @@ public class BitmapLayer extends MapBaseLayer {
             } else {
                 canvas.setMatrix(currentMatrix);
             }
-            canvas.drawPixelMapHolder(new PixelMapHolder(bitmap), goal[0] - bitmap.getImageInfo().size.width / 2,
-                    goal[1] - bitmap.getImageInfo().size.width / 2, paint);
+            canvas.drawPixelMapHolder(new PixelMapHolder(bitmap), goal[0] - (float) bitmap.getImageInfo().size.width / 2,
+                    goal[1] - (float) bitmap.getImageInfo().size.width / 2, paint);
             canvas.restore();
         }
     }
diff --git a/library/src/main/java/com/onlylemi/mapview/library/layer/LocationLayer.java b/library/src/main/java/com/onlylemi/mapview/library/layer/LocationLayer.java
index 8b7bea3c0ad6c7d1ae31b89f5765e6b81ff06d18..450e96e90a937d6c7cc6d623427dbd0988fd50c8 100644
--- a/library/src/main/java/com/onlylemi/mapview/library/layer/LocationLayer.java
+++ b/library/src/main/java/com/onlylemi/mapview/library/layer/LocationLayer.java
@@ -144,7 +144,7 @@ public class LocationLayer extends MapBaseLayer {
                     canvas.rotate(this.compassIndicatorArrowRotateDegree,
                             goal[0], goal[1]);
                     canvas.drawPixelMapHolder(new PixelMapHolder(compassIndicatorArrowBitmap), goal[0]
-                                    - compassIndicatorArrowBitmap.getImageInfo().size.width / 2,
+                                    - (float) compassIndicatorArrowBitmap.getImageInfo().size.width / 2,
                             goal[1] - defaultLocationCircleRadius
                                     - compassIndicatorGap, new Paint());
                     canvas.restore();
diff --git a/library/src/main/java/com/onlylemi/mapview/library/layer/MarkLayer.java b/library/src/main/java/com/onlylemi/mapview/library/layer/MarkLayer.java
index 05b560333688df49b5e84597e4dc29d49be29fea..df04c2c9de8e1f429b60d26dfaa735fda0b28c0f 100644
--- a/library/src/main/java/com/onlylemi/mapview/library/layer/MarkLayer.java
+++ b/library/src/main/java/com/onlylemi/mapview/library/layer/MarkLayer.java
@@ -67,8 +67,8 @@ public class MarkLayer extends MapBaseLayer {
                         event.getPointerPosition(0).getY());
                 for (int i = 0; i < marks.size(); i++) {
                     if (MapMath.getDistanceBetweenTwoPoints(goal[0], goal[1],
-                            marks.get(i).getPointX() - bmpMark.getImageInfo().size.width / 2,
-                            marks.get(i).getPointY() - bmpMark.getImageInfo().size.height / 2) <= 50) {
+                            marks.get(i).getPointX() - (float) bmpMark.getImageInfo().size.width / 2,
+                            marks.get(i).getPointY() - (float) bmpMark.getImageInfo().size.height / 2) <= 50) {
                         num = i;
                         isClickMark = true;
                         break;
@@ -110,11 +110,11 @@ public class MarkLayer extends MapBaseLayer {
 
                     //mark ico
                     canvas.drawPixelMapHolder(new PixelMapHolder(bmpMark),
-                            goal[0] - bmpMark.getImageInfo().size.width / 2,
-                            goal[1] - bmpMark.getImageInfo().size.height / 2, paint);
+                            goal[0] - (float) bmpMark.getImageInfo().size.width / 2,
+                            goal[1] - (float) bmpMark.getImageInfo().size.height / 2, paint);
                     if (i == num && isClickMark) {
                         canvas.drawPixelMapHolder(new PixelMapHolder(bmpMarkTouch),
-                                goal[0] - bmpMarkTouch.getImageInfo().size.width / 2,
+                                goal[0] - (float) bmpMarkTouch.getImageInfo().size.width / 2,
                                 goal[1] - bmpMarkTouch.getImageInfo().size.height, paint);
                     }
                 }
diff --git a/library/src/main/java/com/onlylemi/mapview/library/layer/RouteLayer.java b/library/src/main/java/com/onlylemi/mapview/library/layer/RouteLayer.java
index 5b7d12b996e8610dc1acfa66f479fdc51e767e92..acf5ce6233e4af873d0e0dd6cc1409f130a36146 100644
--- a/library/src/main/java/com/onlylemi/mapview/library/layer/RouteLayer.java
+++ b/library/src/main/java/com/onlylemi/mapview/library/layer/RouteLayer.java
@@ -100,10 +100,10 @@ public class RouteLayer extends MapBaseLayer {
                 currentMatrix.mapPoints(goal1);
                 currentMatrix.mapPoints(goal2);
                 canvas.drawPixelMapHolder(new PixelMapHolder(routeStartBmp),
-                        goal1[0] - routeStartBmp.getImageInfo().size.width / 2, goal1[1]
+                        goal1[0] - (float) routeStartBmp.getImageInfo().size.width / 2, goal1[1]
                                 - routeStartBmp.getImageInfo().size.height, paint);
                 canvas.drawPixelMapHolder(new PixelMapHolder(routeEndBmp),
-                        goal2[0] - routeEndBmp.getImageInfo().size.width / 2, goal2[1]
+                        goal2[0] - (float) routeEndBmp.getImageInfo().size.width / 2, goal2[1]
                                 - routeEndBmp.getImageInfo().size.height, paint);
             }