diff --git a/graphics/java/android/renderscript/Allocation.java b/graphics/java/android/renderscript/Allocation.java
index 957f2dd..b6ac14a 100644
--- a/graphics/java/android/renderscript/Allocation.java
+++ b/graphics/java/android/renderscript/Allocation.java
@@ -40,27 +40,36 @@
     }
 
     public void uploadToTexture(int baseMipLevel) {
+        mRS.validate();
+        mRS.validateSurface();
         mRS.nAllocationUploadToTexture(mID, baseMipLevel);
     }
 
     public void uploadToBufferObject() {
+        mRS.validate();
+        mRS.validateSurface();
         mRS.nAllocationUploadToBufferObject(mID);
     }
 
     public void data(int[] d) {
+        mRS.validate();
         subData1D(0, mType.getElementCount(), d);
     }
     public void data(short[] d) {
+        mRS.validate();
         subData1D(0, mType.getElementCount(), d);
     }
     public void data(byte[] d) {
+        mRS.validate();
         subData1D(0, mType.getElementCount(), d);
     }
     public void data(float[] d) {
+        mRS.validate();
         subData1D(0, mType.getElementCount(), d);
     }
 
     private void data1DChecks(int off, int count, int len, int dataSize) {
+        mRS.validate();
         if((off < 0) || (count < 1) || ((off + count) > mType.getElementCount())) {
             throw new IllegalArgumentException("Offset or Count out of bounds.");
         }
@@ -93,30 +102,37 @@
 
 
     public void subData2D(int xoff, int yoff, int w, int h, int[] d) {
+        mRS.validate();
         mRS.nAllocationSubData2D(mID, xoff, yoff, w, h, d, d.length * 4);
     }
 
     public void subData2D(int xoff, int yoff, int w, int h, float[] d) {
+        mRS.validate();
         mRS.nAllocationSubData2D(mID, xoff, yoff, w, h, d, d.length * 4);
     }
 
     public void readData(int[] d) {
+        mRS.validate();
         mRS.nAllocationRead(mID, d);
     }
 
     public void readData(float[] d) {
+        mRS.validate();
         mRS.nAllocationRead(mID, d);
     }
 
     public void data(Object o) {
+        mRS.validate();
         mRS.nAllocationSubDataFromObject(mID, mType, 0, o);
     }
 
     public void read(Object o) {
+        mRS.validate();
         mRS.nAllocationSubReadFromObject(mID, mType, 0, o);
     }
 
     public void subData(int offset, Object o) {
+        mRS.validate();
         mRS.nAllocationSubDataFromObject(mID, mType, offset, o);
     }
 
@@ -127,27 +143,33 @@
         }
 
         public void setConstraint(Dimension dim, int value) {
+            mRS.validate();
             mRS.nAdapter1DSetConstraint(mID, dim.mID, value);
         }
 
         public void data(int[] d) {
+            mRS.validate();
             mRS.nAdapter1DData(mID, d);
         }
 
         public void data(float[] d) {
+            mRS.validate();
             mRS.nAdapter1DData(mID, d);
         }
 
         public void subData(int off, int count, int[] d) {
+            mRS.validate();
             mRS.nAdapter1DSubData(mID, off, count, d);
         }
 
         public void subData(int off, int count, float[] d) {
+            mRS.validate();
             mRS.nAdapter1DSubData(mID, off, count, d);
         }
     }
 
     public Adapter1D createAdapter1D() {
+        mRS.validate();
         int id = mRS.nAdapter1DCreate();
         if (id != 0) {
             mRS.nAdapter1DBindAllocation(id, mID);
@@ -163,27 +185,33 @@
         }
 
         public void setConstraint(Dimension dim, int value) {
+            mRS.validate();
             mRS.nAdapter2DSetConstraint(mID, dim.mID, value);
         }
 
         public void data(int[] d) {
+            mRS.validate();
             mRS.nAdapter2DData(mID, d);
         }
 
         public void data(float[] d) {
+            mRS.validate();
             mRS.nAdapter2DData(mID, d);
         }
 
         public void subData(int xoff, int yoff, int w, int h, int[] d) {
+            mRS.validate();
             mRS.nAdapter2DSubData(mID, xoff, yoff, w, h, d);
         }
 
         public void subData(int xoff, int yoff, int w, int h, float[] d) {
+            mRS.validate();
             mRS.nAdapter2DSubData(mID, xoff, yoff, w, h, d);
         }
     }
 
     public Adapter2D createAdapter2D() {
+        mRS.validate();
         int id = mRS.nAdapter2DCreate();
         if (id != 0) {
             mRS.nAdapter2DBindAllocation(id, mID);
@@ -202,6 +230,7 @@
     static public Allocation createTyped(RenderScript rs, Type type)
         throws IllegalArgumentException {
 
+        rs.validate();
         if(type.mID == 0) {
             throw new IllegalStateException("Bad Type");
         }
@@ -212,6 +241,7 @@
     static public Allocation createSized(RenderScript rs, Element e, int count)
         throws IllegalArgumentException {
 
+        rs.validate();
         Type.Builder b = new Type.Builder(rs, e);
         b.add(Dimension.X, count);
         Type t = b.create();
@@ -226,6 +256,7 @@
     static public Allocation createFromBitmap(RenderScript rs, Bitmap b, Element dstFmt, boolean genMips)
         throws IllegalArgumentException {
 
+        rs.validate();
         int id = rs.nAllocationCreateFromBitmap(dstFmt.mID, genMips, b);
         return new Allocation(id, rs, null);
     }
@@ -233,6 +264,7 @@
     static public Allocation createFromBitmapBoxed(RenderScript rs, Bitmap b, Element dstFmt, boolean genMips)
         throws IllegalArgumentException {
 
+        rs.validate();
         int id = rs.nAllocationCreateFromBitmapBoxed(dstFmt.mID, genMips, b);
         return new Allocation(id, rs, null);
     }
@@ -240,6 +272,7 @@
     static public Allocation createFromBitmapResource(RenderScript rs, Resources res, int id, Element dstFmt, boolean genMips)
         throws IllegalArgumentException {
 
+        rs.validate();
         InputStream is = null;
         try {
             final TypedValue value = new TypedValue();
diff --git a/graphics/java/android/renderscript/Element.java b/graphics/java/android/renderscript/Element.java
index 73d8266..ee9b098 100644
--- a/graphics/java/android/renderscript/Element.java
+++ b/graphics/java/android/renderscript/Element.java
@@ -284,6 +284,7 @@
     }
 
     public static Element createFromClass(RenderScript rs, Class c) {
+        rs.validate();
         Field[] fields = c.getFields();
         Builder b = new Builder(rs);
 
@@ -322,6 +323,7 @@
     }
 
     void init() {
+        mRS.validate();
         internalCreate(mRS, this);
     }
 
@@ -483,6 +485,7 @@
         }
 
         public Element create() {
+            mRS.validate();
             Element e = new Element(mRS, mEntryCount);
             java.lang.System.arraycopy(mEntries, 0, e.mEntries, 0, mEntryCount);
             e.init();
diff --git a/graphics/java/android/renderscript/Light.java b/graphics/java/android/renderscript/Light.java
index 115ae03..aab656f 100644
--- a/graphics/java/android/renderscript/Light.java
+++ b/graphics/java/android/renderscript/Light.java
@@ -30,10 +30,12 @@
     }
 
     public void setColor(float r, float g, float b) {
+        mRS.validate();
         mRS.nLightSetColor(mID, r, g, b);
     }
 
     public void setPosition(float x, float y, float z) {
+        mRS.validate();
         mRS.nLightSetPosition(mID, x, y, z);
     }
 
@@ -65,6 +67,7 @@
         }
 
         public Light create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }
diff --git a/graphics/java/android/renderscript/ProgramFragment.java b/graphics/java/android/renderscript/ProgramFragment.java
index 392d93d..1a72578 100644
--- a/graphics/java/android/renderscript/ProgramFragment.java
+++ b/graphics/java/android/renderscript/ProgramFragment.java
@@ -47,6 +47,7 @@
 
     public void bindTexture(Allocation va, int slot)
         throws IllegalArgumentException {
+        mRS.validate();
         if((slot < 0) || (slot >= MAX_SLOT)) {
             throw new IllegalArgumentException("Slot ID out of range.");
         }
@@ -56,6 +57,7 @@
 
     public void bindSampler(Sampler vs, int slot)
         throws IllegalArgumentException {
+        mRS.validate();
         if((slot < 0) || (slot >= MAX_SLOT)) {
             throw new IllegalArgumentException("Slot ID out of range.");
         }
@@ -149,6 +151,7 @@
         }
 
         public ProgramFragment create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }
diff --git a/graphics/java/android/renderscript/ProgramRaster.java b/graphics/java/android/renderscript/ProgramRaster.java
index ab327f1..56f9bf4 100644
--- a/graphics/java/android/renderscript/ProgramRaster.java
+++ b/graphics/java/android/renderscript/ProgramRaster.java
@@ -46,11 +46,13 @@
     }
 
     public void setLineWidth(float w) {
+        mRS.validate();
         mLineWidth = w;
         mRS.nProgramRasterSetLineWidth(mID, w);
     }
 
     public void setPointSize(float s) {
+        mRS.validate();
         mPointSize = s;
         mRS.nProgramRasterSetPointSize(mID, s);
     }
@@ -98,6 +100,7 @@
         }
 
         public ProgramRaster create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }
diff --git a/graphics/java/android/renderscript/ProgramStore.java b/graphics/java/android/renderscript/ProgramStore.java
index 5cbe1b2..69be245 100644
--- a/graphics/java/android/renderscript/ProgramStore.java
+++ b/graphics/java/android/renderscript/ProgramStore.java
@@ -162,6 +162,7 @@
         }
 
         public ProgramStore create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }
diff --git a/graphics/java/android/renderscript/ProgramVertex.java b/graphics/java/android/renderscript/ProgramVertex.java
index ddb23ac..ba97d5b 100644
--- a/graphics/java/android/renderscript/ProgramVertex.java
+++ b/graphics/java/android/renderscript/ProgramVertex.java
@@ -34,6 +34,7 @@
     }
 
     public void bindAllocation(MatrixAllocation va) {
+        mRS.validate();
         mRS.nProgramVertexBindAllocation(mID, va.mAlloc.mID);
     }
 
@@ -88,6 +89,7 @@
         }
 
         public ProgramVertex create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }
diff --git a/graphics/java/android/renderscript/RenderScript.java b/graphics/java/android/renderscript/RenderScript.java
index c42f647..0d8b675 100644
--- a/graphics/java/android/renderscript/RenderScript.java
+++ b/graphics/java/android/renderscript/RenderScript.java
@@ -242,6 +242,18 @@
         }
     }
 
+    void validate() {
+        if (mContext == 0) {
+            throw new IllegalStateException("Calling RS with no Context active.");
+        }
+    }
+
+    void validateSurface() {
+        if (mSurface == null) {
+            throw new IllegalStateException("Uploading data to GL with no surface.");
+        }
+    }
+
     public void contextSetPriority(Priority p) {
         nContextSetPriority(p.mID);
     }
diff --git a/graphics/java/android/renderscript/Sampler.java b/graphics/java/android/renderscript/Sampler.java
index 5e0b110..625a576 100644
--- a/graphics/java/android/renderscript/Sampler.java
+++ b/graphics/java/android/renderscript/Sampler.java
@@ -100,6 +100,7 @@
         }
 
         public Sampler create() {
+            mRS.validate();
             return internalCreate(mRS, this);
         }
     }
diff --git a/graphics/java/android/renderscript/Script.java b/graphics/java/android/renderscript/Script.java
index 35791a3..57ccfa3 100644
--- a/graphics/java/android/renderscript/Script.java
+++ b/graphics/java/android/renderscript/Script.java
@@ -48,22 +48,27 @@
     }
 
     public void bindAllocation(Allocation va, int slot) {
+        mRS.validate();
         mRS.nScriptBindAllocation(mID, va.mID, slot);
     }
 
     public void setClearColor(float r, float g, float b, float a) {
+        mRS.validate();
         mRS.nScriptSetClearColor(mID, r, g, b, a);
     }
 
     public void setClearDepth(float d) {
+        mRS.validate();
         mRS.nScriptSetClearDepth(mID, d);
     }
 
     public void setClearStencil(int stencil) {
+        mRS.validate();
         mRS.nScriptSetClearStencil(mID, stencil);
     }
 
     public void setTimeZone(String timeZone) {
+        mRS.validate();
         try {
             mRS.nScriptSetTimeZone(mID, timeZone.getBytes("UTF-8"));
         } catch (java.io.UnsupportedEncodingException e) {
diff --git a/graphics/java/android/renderscript/SimpleMesh.java b/graphics/java/android/renderscript/SimpleMesh.java
index 3d10e3b..f45074e 100644
--- a/graphics/java/android/renderscript/SimpleMesh.java
+++ b/graphics/java/android/renderscript/SimpleMesh.java
@@ -35,18 +35,22 @@
     }
 
     public void bindVertexAllocation(Allocation a, int slot) {
+        mRS.validate();
         mRS.nSimpleMeshBindVertex(mID, a.mID, slot);
     }
 
     public void bindIndexAllocation(Allocation a) {
+        mRS.validate();
         mRS.nSimpleMeshBindIndex(mID, a.mID);
     }
 
     public Allocation createVertexAllocation(int slot) {
+        mRS.validate();
         return Allocation.createTyped(mRS, mVertexTypes[slot]);
     }
 
     public Allocation createIndexAllocation() {
+        mRS.validate();
         return Allocation.createTyped(mRS, mIndexType);
     }
 
@@ -162,6 +166,7 @@
         }
 
         public SimpleMesh create() {
+            mRS.validate();
             SimpleMesh sm = internalCreate(mRS, this);
             sm.mVertexTypes = new Type[mVertexTypeCount];
             for(int ct=0; ct < mVertexTypeCount; ct++) {