diff --git a/library/src/main/cpp/BlurUtil.cpp b/library/src/main/cpp/BlurUtil.cpp
index b43d6c4..b953011 100644
--- a/library/src/main/cpp/BlurUtil.cpp
+++ b/library/src/main/cpp/BlurUtil.cpp
@@ -19,7 +19,7 @@ jint clamp(jint i, jint minValue, jint maxValue) {
 
 
 JNIEXPORT void JNICALL
-Java_com_hoko_ktblur_ext_BitmapExtensionKt_replaceWithPixels(JNIEnv *env, jclass clazz, jobject jbitmap,
+Java_com_hoko_ktblur_ext_BitmapExtensionKt_nativeReplaceWithPixels(JNIEnv *env, jclass clazz, jobject jbitmap,
                                                  jintArray j_inArray, jint j_x, jint j_y,
                                                  jint j_deltaW, jint j_deltaH) {
 
diff --git a/library/src/main/cpp/include/BlurUtil.h b/library/src/main/cpp/include/BlurUtil.h
index cff93ab..299567c 100644
--- a/library/src/main/cpp/include/BlurUtil.h
+++ b/library/src/main/cpp/include/BlurUtil.h
@@ -22,7 +22,7 @@ enum Direction{
 jint clamp(jint i, jint minValue, jint maxValue);
 
 JNIEXPORT void JNICALL
-Java_com_hoko_ktblur_ext_BitmapExtensionKt_replaceWithPixels(JNIEnv *, jclass , jobject,
+Java_com_hoko_ktblur_ext_BitmapExtensionKt_nativeReplaceWithPixels(JNIEnv *, jclass , jobject,
                                                          jintArray j_inArray, jint, jint, jint, jint);
 
 #ifdef __cplusplus
diff --git a/library/src/main/java/com/hoko/ktblur/api/BlurBuild.kt b/library/src/main/java/com/hoko/ktblur/api/BlurBuild.kt
index 174057c..be463ff 100644
--- a/library/src/main/java/com/hoko/ktblur/api/BlurBuild.kt
+++ b/library/src/main/java/com/hoko/ktblur/api/BlurBuild.kt
@@ -3,7 +3,6 @@ package com.hoko.ktblur.api
 import android.content.Context
 import android.graphics.Bitmap
 import android.view.View
-import com.hoko.ktblur.task.BlurCallback
 import kotlinx.coroutines.Job
 
 interface BlurBuild {
diff --git a/library/src/main/java/com/hoko/ktblur/task/BlurCallback.kt b/library/src/main/java/com/hoko/ktblur/api/BlurCallback.kt
similarity index 93%
rename from library/src/main/java/com/hoko/ktblur/task/BlurCallback.kt
rename to library/src/main/java/com/hoko/ktblur/api/BlurCallback.kt
index 6f06d93..4e10b4a 100644
--- a/library/src/main/java/com/hoko/ktblur/task/BlurCallback.kt
+++ b/library/src/main/java/com/hoko/ktblur/api/BlurCallback.kt
@@ -1,4 +1,4 @@
-package com.hoko.ktblur.task
+package com.hoko.ktblur.api
 
 import android.graphics.Bitmap
 
diff --git a/library/src/main/java/com/hoko/ktblur/api/BlurProcessor.kt b/library/src/main/java/com/hoko/ktblur/api/BlurProcessor.kt
index 61d9770..83b3a14 100644
--- a/library/src/main/java/com/hoko/ktblur/api/BlurProcessor.kt
+++ b/library/src/main/java/com/hoko/ktblur/api/BlurProcessor.kt
@@ -2,7 +2,6 @@ package com.hoko.ktblur.api
 
 import android.graphics.Bitmap
 import android.view.View
-import com.hoko.ktblur.task.BlurCallback
 import kotlinx.coroutines.Job
 
 interface BlurProcessor {
diff --git a/library/src/main/java/com/hoko/ktblur/ext/BitmapExtension.kt b/library/src/main/java/com/hoko/ktblur/ext/BitmapExtension.kt
index d33e4a4..83241ea 100644
--- a/library/src/main/java/com/hoko/ktblur/ext/BitmapExtension.kt
+++ b/library/src/main/java/com/hoko/ktblur/ext/BitmapExtension.kt
@@ -27,4 +27,8 @@ internal fun Bitmap.translate(translateX: Int, translateY: Int): Bitmap {
     return Bitmap.createBitmap(this, translateX, translateY, this.width - translateX, this.height - translateY)
 }
 
-external fun Bitmap.replaceWithPixels(pixels: IntArray, x: Int, y: Int, deltaX: Int, deltaY: Int)
\ No newline at end of file
+internal fun Bitmap.replaceWithPixels(pixels: IntArray, x: Int, y: Int, deltaX: Int, deltaY: Int) {
+    this.nativeReplaceWithPixels(pixels, x, y, deltaX, deltaY)
+}
+
+private external fun Bitmap.nativeReplaceWithPixels(pixels: IntArray, x: Int, y: Int, deltaX: Int, deltaY: Int)
\ No newline at end of file
diff --git a/library/src/main/java/com/hoko/ktblur/filter/NativeBlurFilter.kt b/library/src/main/java/com/hoko/ktblur/filter/NativeBlurFilter.kt
index 30c0e90..30bd423 100644
--- a/library/src/main/java/com/hoko/ktblur/filter/NativeBlurFilter.kt
+++ b/library/src/main/java/com/hoko/ktblur/filter/NativeBlurFilter.kt
@@ -5,7 +5,7 @@ import android.util.Log
 import com.hoko.ktblur.api.Direction
 import com.hoko.ktblur.api.Mode
 
-object NativeBlurFilter {
+internal object NativeBlurFilter {
     private const val TAG = "OriginBlurFilter"
     private var nativeLoaded = false
     fun doBlur(mode: Mode, bitmap: Bitmap, radius: Int, cores: Int, index: Int, direction: Direction) {
diff --git a/library/src/main/java/com/hoko/ktblur/processor/AbstractBlurProcessor.kt b/library/src/main/java/com/hoko/ktblur/processor/AbstractBlurProcessor.kt
index db9d736..6b83e87 100644
--- a/library/src/main/java/com/hoko/ktblur/processor/AbstractBlurProcessor.kt
+++ b/library/src/main/java/com/hoko/ktblur/processor/AbstractBlurProcessor.kt
@@ -10,7 +10,7 @@ import com.hoko.ktblur.ext.translate
 import com.hoko.ktblur.api.Mode
 import com.hoko.ktblur.api.Scheme
 import com.hoko.ktblur.task.BitmapAsyncBlurTask
-import com.hoko.ktblur.task.BlurCallback
+import com.hoko.ktblur.api.BlurCallback
 import com.hoko.ktblur.task.ViewAsyncBlurTask
 import kotlinx.coroutines.Job
 
diff --git a/library/src/main/java/com/hoko/ktblur/processor/HokoBlurBuild.kt b/library/src/main/java/com/hoko/ktblur/processor/HokoBlurBuild.kt
index 4dab0b2..8267196 100644
--- a/library/src/main/java/com/hoko/ktblur/processor/HokoBlurBuild.kt
+++ b/library/src/main/java/com/hoko/ktblur/processor/HokoBlurBuild.kt
@@ -9,10 +9,10 @@ import com.hoko.ktblur.api.BlurResultDispatcher
 import com.hoko.ktblur.api.Mode
 import com.hoko.ktblur.api.Scheme
 import com.hoko.ktblur.task.AndroidBlurResultDispatcher
-import com.hoko.ktblur.task.BlurCallback
+import com.hoko.ktblur.api.BlurCallback
 import kotlinx.coroutines.Job
 
-class HokoBlurBuild(var context: Context) : BlurBuild {
+internal class HokoBlurBuild(var context: Context) : BlurBuild {
     internal var radius: Int = 10
     internal var mode: Mode = Mode.STACK
     internal var scheme: Scheme = Scheme.NATIVE
diff --git a/library/src/main/java/com/hoko/ktblur/task/AsyncBlurTasks.kt b/library/src/main/java/com/hoko/ktblur/task/AsyncBlurTasks.kt
index 73dca5a..30b7f5f 100644
--- a/library/src/main/java/com/hoko/ktblur/task/AsyncBlurTasks.kt
+++ b/library/src/main/java/com/hoko/ktblur/task/AsyncBlurTasks.kt
@@ -2,13 +2,14 @@ package com.hoko.ktblur.task
 
 import android.graphics.Bitmap
 import android.view.View
+import com.hoko.ktblur.api.BlurCallback
 import com.hoko.ktblur.api.BlurProcessor
 import com.hoko.ktblur.api.BlurResultDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
 
-abstract class AsyncBlurTask<in T>(
+internal abstract class AsyncBlurTask<in T>(
     private val block: BlurCallback.() -> Unit,
     private val target: T,
     private val dispatcher: BlurResultDispatcher