diff --git a/src/com/android/gallery3d/glrenderer/BitmapTexture.java b/src/com/android/gallery3d/glrenderer/BitmapTexture.java
index 100b0b3b9c1f82b4ea6691c5ea644e9791db9bf0..f8b01cb428c400146f500e30131b99c1991a594d 100644
--- a/src/com/android/gallery3d/glrenderer/BitmapTexture.java
+++ b/src/com/android/gallery3d/glrenderer/BitmapTexture.java
@@ -18,7 +18,7 @@ package com.android.gallery3d.glrenderer;
 
 import android.graphics.Bitmap;
 
-import junit.framework.Assert;
+import com.android.gallery3d.common.Utils;
 
 // BitmapTexture is a texture whose content is specified by a fixed Bitmap.
 //
@@ -34,7 +34,7 @@ public class BitmapTexture extends UploadedTexture {
 
     public BitmapTexture(Bitmap bitmap, boolean hasBorder) {
         super(hasBorder);
-        Assert.assertTrue(bitmap != null && !bitmap.isRecycled());
+        Utils.assertTrue(bitmap != null && !bitmap.isRecycled());
         mContentBitmap = bitmap;
     }
 
diff --git a/src/com/android/gallery3d/glrenderer/GLES11Canvas.java b/src/com/android/gallery3d/glrenderer/GLES11Canvas.java
index 7013c3d1f39931c532d83104f751eba52ffbca48..74ccfb57be5e5ef241b3bc13a4c5bf95240a76e8 100644
--- a/src/com/android/gallery3d/glrenderer/GLES11Canvas.java
+++ b/src/com/android/gallery3d/glrenderer/GLES11Canvas.java
@@ -27,8 +27,6 @@ import android.util.Log;
 import com.android.gallery3d.common.Utils;
 import com.android.gallery3d.util.IntArray;
 
-import junit.framework.Assert;
-
 import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
@@ -126,7 +124,7 @@ public class GLES11Canvas implements GLCanvas {
 
     @Override
     public void setSize(int width, int height) {
-        Assert.assertTrue(width >= 0 && height >= 0);
+        Utils.assertTrue(width >= 0 && height >= 0);
 
         if (mTargetTexture == null) {
             mScreenWidth = width;
@@ -154,7 +152,7 @@ public class GLES11Canvas implements GLCanvas {
 
     @Override
     public void setAlpha(float alpha) {
-        Assert.assertTrue(alpha >= 0 && alpha <= 1);
+        Utils.assertTrue(alpha >= 0 && alpha <= 1);
         mAlpha = alpha;
     }
 
@@ -165,7 +163,7 @@ public class GLES11Canvas implements GLCanvas {
 
     @Override
     public void multiplyAlpha(float alpha) {
-        Assert.assertTrue(alpha >= 0 && alpha <= 1);
+        Utils.assertTrue(alpha >= 0 && alpha <= 1);
         mAlpha *= alpha;
     }
 
diff --git a/src/com/android/gallery3d/glrenderer/GLPaint.java b/src/com/android/gallery3d/glrenderer/GLPaint.java
index 16b220690ef4015c52add99a359aa3e20ca0bb67..b26e9ab2944718947c06dacff485b0e259011d22 100644
--- a/src/com/android/gallery3d/glrenderer/GLPaint.java
+++ b/src/com/android/gallery3d/glrenderer/GLPaint.java
@@ -16,7 +16,7 @@
 
 package com.android.gallery3d.glrenderer;
 
-import junit.framework.Assert;
+import com.android.gallery3d.common.Utils;
 
 public class GLPaint {
     private float mLineWidth = 1f;
@@ -31,7 +31,7 @@ public class GLPaint {
     }
 
     public void setLineWidth(float width) {
-        Assert.assertTrue(width >= 0);
+        Utils.assertTrue(width >= 0);
         mLineWidth = width;
     }
 
diff --git a/src/com/android/gallery3d/glrenderer/ResourceTexture.java b/src/com/android/gallery3d/glrenderer/ResourceTexture.java
index eb8e8a51766bc336241df7789fc49ed6290bfec0..a091fb204b6e3b650f795d562c7e6496f6909083 100644
--- a/src/com/android/gallery3d/glrenderer/ResourceTexture.java
+++ b/src/com/android/gallery3d/glrenderer/ResourceTexture.java
@@ -20,7 +20,7 @@ import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 
-import junit.framework.Assert;
+import com.android.gallery3d.common.Utils;
 
 // ResourceTexture is a texture whose Bitmap is decoded from a resource.
 // By default ResourceTexture is not opaque.
@@ -30,7 +30,7 @@ public class ResourceTexture extends UploadedTexture {
     protected final int mResId;
 
     public ResourceTexture(Context context, int resId) {
-        Assert.assertNotNull(context);
+        Utils.checkNotNull(context);
         mContext = context;
         mResId = resId;
         setOpaque(false);
diff --git a/src/com/android/gallery3d/glrenderer/UploadedTexture.java b/src/com/android/gallery3d/glrenderer/UploadedTexture.java
index f41a979b7ddd0552b097f35a09f649f9028a43e7..417102a386b6b19b19553decef4b756166c3d497 100644
--- a/src/com/android/gallery3d/glrenderer/UploadedTexture.java
+++ b/src/com/android/gallery3d/glrenderer/UploadedTexture.java
@@ -20,7 +20,7 @@ import android.graphics.Bitmap;
 import android.graphics.Bitmap.Config;
 import android.opengl.GLUtils;
 
-import junit.framework.Assert;
+import com.android.gallery3d.common.Utils;
 
 import java.util.HashMap;
 
@@ -144,7 +144,7 @@ public abstract class UploadedTexture extends BasicTexture {
     }
 
     private void freeBitmap() {
-        Assert.assertTrue(mBitmap != null);
+        Utils.assertTrue(mBitmap != null);
         onFreeBitmap(mBitmap);
         mBitmap = null;
     }
@@ -219,7 +219,7 @@ public abstract class UploadedTexture extends BasicTexture {
                 int texWidth = getTextureWidth();
                 int texHeight = getTextureHeight();
 
-                Assert.assertTrue(bWidth <= texWidth && bHeight <= texHeight);
+                Utils.assertTrue(bWidth <= texWidth && bHeight <= texHeight);
 
                 // Upload the bitmap to a new texture.
                 mId = canvas.getGLId().generateTexture();