diff --git a/src/flowgraph/ChannelCountConverter.cpp b/src/flowgraph/ChannelCountConverter.cpp
index 03de262ca..b56f8b270 100644
--- a/src/flowgraph/ChannelCountConverter.cpp
+++ b/src/flowgraph/ChannelCountConverter.cpp
@@ -18,7 +18,7 @@
 #include "FlowGraphNode.h"
 #include "ChannelCountConverter.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 ChannelCountConverter::ChannelCountConverter(
         int32_t inputChannelCount,
diff --git a/src/flowgraph/ChannelCountConverter.h b/src/flowgraph/ChannelCountConverter.h
index e4b6f4e66..bf90608e7 100644
--- a/src/flowgraph/ChannelCountConverter.h
+++ b/src/flowgraph/ChannelCountConverter.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -48,5 +49,6 @@ namespace flowgraph {
     };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_CHANNEL_COUNT_CONVERTER_H
diff --git a/src/flowgraph/ClipToRange.cpp b/src/flowgraph/ClipToRange.cpp
index d2f8a02ac..c6ad0b0fe 100644
--- a/src/flowgraph/ClipToRange.cpp
+++ b/src/flowgraph/ClipToRange.cpp
@@ -19,7 +19,7 @@
 #include "FlowGraphNode.h"
 #include "ClipToRange.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 ClipToRange::ClipToRange(int32_t channelCount)
         : FlowGraphFilter(channelCount) {
diff --git a/src/flowgraph/ClipToRange.h b/src/flowgraph/ClipToRange.h
index 22b780496..cd7d1c156 100644
--- a/src/flowgraph/ClipToRange.h
+++ b/src/flowgraph/ClipToRange.h
@@ -23,6 +23,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 // This is 3 dB, (10^(3/20)), to match the maximum headroom in AudioTrack for float data.
@@ -64,5 +65,6 @@ class ClipToRange : public FlowGraphFilter {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_CLIP_TO_RANGE_H
diff --git a/src/flowgraph/FlowGraphNode.cpp b/src/flowgraph/FlowGraphNode.cpp
index fd2674894..c7e3ff9d0 100644
--- a/src/flowgraph/FlowGraphNode.cpp
+++ b/src/flowgraph/FlowGraphNode.cpp
@@ -19,7 +19,7 @@
 #include <sys/types.h>
 #include "FlowGraphNode.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 /***************************************************************************/
 int32_t FlowGraphNode::pullData(int32_t numFrames, int64_t callCount) {
diff --git a/src/flowgraph/FlowGraphNode.h b/src/flowgraph/FlowGraphNode.h
index e31cab853..642d83910 100644
--- a/src/flowgraph/FlowGraphNode.h
+++ b/src/flowgraph/FlowGraphNode.h
@@ -40,8 +40,16 @@
 
 // Set this to 1 if using it inside the Android framework.
 // This code is kept here so that it can be moved easily between Oboe and AAudio.
+#ifndef FLOWGRAPH_ANDROID_INTERNAL
 #define FLOWGRAPH_ANDROID_INTERNAL 0
+#endif
 
+// Set this to a name that will prevent AAudio from calling into Oboe.
+#ifndef FLOWGRAPH_OUTER_NAMESPACE
+#define FLOWGRAPH_OUTER_NAMESPACE oboe
+#endif
+
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 // Default block size that can be overridden when the FlowGraphPortFloat is created.
@@ -429,5 +437,6 @@ class FlowGraphFilter : public FlowGraphNode {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif /* FLOWGRAPH_FLOW_GRAPH_NODE_H */
diff --git a/src/flowgraph/ManyToMultiConverter.cpp b/src/flowgraph/ManyToMultiConverter.cpp
index 879685e87..4f973bc3f 100644
--- a/src/flowgraph/ManyToMultiConverter.cpp
+++ b/src/flowgraph/ManyToMultiConverter.cpp
@@ -18,7 +18,7 @@
 
 #include "ManyToMultiConverter.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 ManyToMultiConverter::ManyToMultiConverter(int32_t channelCount)
         : inputs(channelCount)
diff --git a/src/flowgraph/ManyToMultiConverter.h b/src/flowgraph/ManyToMultiConverter.h
index eca4a8ed7..b4811bf58 100644
--- a/src/flowgraph/ManyToMultiConverter.h
+++ b/src/flowgraph/ManyToMultiConverter.h
@@ -23,6 +23,9 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
+namespace flowgraph {
+
 /**
  * Combine multiple mono inputs into one interleaved multi-channel output.
  */
@@ -46,4 +49,7 @@ class ManyToMultiConverter : public flowgraph::FlowGraphNode {
 private:
 };
 
+} /* namespace flowgraph */
+} /* namespace oboe */
+
 #endif //FLOWGRAPH_MANY_TO_MULTI_CONVERTER_H
diff --git a/src/flowgraph/MonoToMultiConverter.cpp b/src/flowgraph/MonoToMultiConverter.cpp
index 803caec80..bb471a0f1 100644
--- a/src/flowgraph/MonoToMultiConverter.cpp
+++ b/src/flowgraph/MonoToMultiConverter.cpp
@@ -18,7 +18,7 @@
 #include "FlowGraphNode.h"
 #include "MonoToMultiConverter.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 MonoToMultiConverter::MonoToMultiConverter(int32_t outputChannelCount)
         : input(*this, 1)
diff --git a/src/flowgraph/MonoToMultiConverter.h b/src/flowgraph/MonoToMultiConverter.h
index 893d9cd09..4185b3328 100644
--- a/src/flowgraph/MonoToMultiConverter.h
+++ b/src/flowgraph/MonoToMultiConverter.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -45,5 +46,6 @@ class MonoToMultiConverter : public FlowGraphNode {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_MONO_TO_MULTI_CONVERTER_H
diff --git a/src/flowgraph/MultiToMonoConverter.cpp b/src/flowgraph/MultiToMonoConverter.cpp
index 21f61246c..8e895bf69 100644
--- a/src/flowgraph/MultiToMonoConverter.cpp
+++ b/src/flowgraph/MultiToMonoConverter.cpp
@@ -18,7 +18,7 @@
 #include "FlowGraphNode.h"
 #include "MultiToMonoConverter.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 MultiToMonoConverter::MultiToMonoConverter(int32_t inputChannelCount)
         : input(*this, inputChannelCount)
diff --git a/src/flowgraph/MultiToMonoConverter.h b/src/flowgraph/MultiToMonoConverter.h
index 37c53bde6..374558c10 100644
--- a/src/flowgraph/MultiToMonoConverter.h
+++ b/src/flowgraph/MultiToMonoConverter.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -45,5 +46,6 @@ namespace flowgraph {
     };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_MULTI_TO_MONO_CONVERTER_H
diff --git a/src/flowgraph/RampLinear.cpp b/src/flowgraph/RampLinear.cpp
index afef0181c..33b2712c8 100644
--- a/src/flowgraph/RampLinear.cpp
+++ b/src/flowgraph/RampLinear.cpp
@@ -19,7 +19,7 @@
 #include "FlowGraphNode.h"
 #include "RampLinear.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 RampLinear::RampLinear(int32_t channelCount)
         : FlowGraphFilter(channelCount) {
diff --git a/src/flowgraph/RampLinear.h b/src/flowgraph/RampLinear.h
index f285704c7..cb52d21f7 100644
--- a/src/flowgraph/RampLinear.h
+++ b/src/flowgraph/RampLinear.h
@@ -23,6 +23,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -92,5 +93,6 @@ class RampLinear : public FlowGraphFilter {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_RAMP_LINEAR_H
diff --git a/src/flowgraph/SampleRateConverter.cpp b/src/flowgraph/SampleRateConverter.cpp
index 708c684fc..0c92d7fdf 100644
--- a/src/flowgraph/SampleRateConverter.cpp
+++ b/src/flowgraph/SampleRateConverter.cpp
@@ -16,7 +16,7 @@
 
 #include "SampleRateConverter.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 using namespace resampler;
 
 SampleRateConverter::SampleRateConverter(int32_t channelCount, MultiChannelResampler &resampler)
diff --git a/src/flowgraph/SampleRateConverter.h b/src/flowgraph/SampleRateConverter.h
index d940b22b9..d54bcbf50 100644
--- a/src/flowgraph/SampleRateConverter.h
+++ b/src/flowgraph/SampleRateConverter.h
@@ -23,6 +23,7 @@
 #include "FlowGraphNode.h"
 #include "resampler/MultiChannelResampler.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 class SampleRateConverter : public FlowGraphFilter {
@@ -52,5 +53,8 @@ class SampleRateConverter : public FlowGraphFilter {
     int64_t mInputFramePosition = 0; // monotonic counter of input frames used for pullData
 
 };
+
 } /* namespace flowgraph */
+} /* namespace oboe */
+
 #endif //OBOE_SAMPLE_RATE_CONVERTER_H
diff --git a/src/flowgraph/SinkFloat.cpp b/src/flowgraph/SinkFloat.cpp
index 20c0ffa03..e0ac6e931 100644
--- a/src/flowgraph/SinkFloat.cpp
+++ b/src/flowgraph/SinkFloat.cpp
@@ -19,7 +19,7 @@
 #include "FlowGraphNode.h"
 #include "SinkFloat.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 SinkFloat::SinkFloat(int32_t channelCount)
         : FlowGraphSink(channelCount) {
diff --git a/src/flowgraph/SinkFloat.h b/src/flowgraph/SinkFloat.h
index 418f6d7c6..eaf679f5a 100644
--- a/src/flowgraph/SinkFloat.h
+++ b/src/flowgraph/SinkFloat.h
@@ -23,6 +23,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -40,5 +41,6 @@ class SinkFloat : public FlowGraphSink {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_SINK_FLOAT_H
diff --git a/src/flowgraph/SinkI16.cpp b/src/flowgraph/SinkI16.cpp
index da7fd6b7c..690431ceb 100644
--- a/src/flowgraph/SinkI16.cpp
+++ b/src/flowgraph/SinkI16.cpp
@@ -23,7 +23,7 @@
 #include <audio_utils/primitives.h>
 #endif
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 SinkI16::SinkI16(int32_t channelCount)
         : FlowGraphSink(channelCount) {}
diff --git a/src/flowgraph/SinkI16.h b/src/flowgraph/SinkI16.h
index 1e1ce3af4..5e758d27e 100644
--- a/src/flowgraph/SinkI16.h
+++ b/src/flowgraph/SinkI16.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -39,5 +40,6 @@ class SinkI16 : public FlowGraphSink {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_SINK_I16_H
diff --git a/src/flowgraph/SinkI24.cpp b/src/flowgraph/SinkI24.cpp
index a9fb5d224..d4f68b684 100644
--- a/src/flowgraph/SinkI24.cpp
+++ b/src/flowgraph/SinkI24.cpp
@@ -25,7 +25,7 @@
 #include <audio_utils/primitives.h>
 #endif
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 SinkI24::SinkI24(int32_t channelCount)
         : FlowGraphSink(channelCount) {}
diff --git a/src/flowgraph/SinkI24.h b/src/flowgraph/SinkI24.h
index 44078a96d..326917800 100644
--- a/src/flowgraph/SinkI24.h
+++ b/src/flowgraph/SinkI24.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -40,5 +41,6 @@ class SinkI24 : public FlowGraphSink {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_SINK_I24_H
diff --git a/src/flowgraph/SourceFloat.cpp b/src/flowgraph/SourceFloat.cpp
index f574d8420..3161ec184 100644
--- a/src/flowgraph/SourceFloat.cpp
+++ b/src/flowgraph/SourceFloat.cpp
@@ -20,7 +20,7 @@
 #include "FlowGraphNode.h"
 #include "SourceFloat.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 SourceFloat::SourceFloat(int32_t channelCount)
         : FlowGraphSourceBuffered(channelCount) {
diff --git a/src/flowgraph/SourceFloat.h b/src/flowgraph/SourceFloat.h
index 4de1b41c3..6cea67ef3 100644
--- a/src/flowgraph/SourceFloat.h
+++ b/src/flowgraph/SourceFloat.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -39,5 +40,6 @@ class SourceFloat : public FlowGraphSourceBuffered {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_SOURCE_FLOAT_H
diff --git a/src/flowgraph/SourceI16.cpp b/src/flowgraph/SourceI16.cpp
index 881302390..16cd2b3dc 100644
--- a/src/flowgraph/SourceI16.cpp
+++ b/src/flowgraph/SourceI16.cpp
@@ -24,7 +24,7 @@
 #include <audio_utils/primitives.h>
 #endif
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 SourceI16::SourceI16(int32_t channelCount)
         : FlowGraphSourceBuffered(channelCount) {
diff --git a/src/flowgraph/SourceI16.h b/src/flowgraph/SourceI16.h
index fe440b200..c2cfb1708 100644
--- a/src/flowgraph/SourceI16.h
+++ b/src/flowgraph/SourceI16.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 /**
  * AudioSource that reads a block of pre-defined 16-bit integer data.
@@ -38,5 +39,6 @@ class SourceI16 : public FlowGraphSourceBuffered {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_SOURCE_I16_H
diff --git a/src/flowgraph/SourceI24.cpp b/src/flowgraph/SourceI24.cpp
index 197587879..321f732f1 100644
--- a/src/flowgraph/SourceI24.cpp
+++ b/src/flowgraph/SourceI24.cpp
@@ -24,7 +24,7 @@
 #include "FlowGraphNode.h"
 #include "SourceI24.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 constexpr int kBytesPerI24Packed = 3;
 
diff --git a/src/flowgraph/SourceI24.h b/src/flowgraph/SourceI24.h
index 377953432..31a430571 100644
--- a/src/flowgraph/SourceI24.h
+++ b/src/flowgraph/SourceI24.h
@@ -22,6 +22,7 @@
 
 #include "FlowGraphNode.h"
 
+namespace FLOWGRAPH_OUTER_NAMESPACE {
 namespace flowgraph {
 
 /**
@@ -39,5 +40,6 @@ class SourceI24 : public FlowGraphSourceBuffered {
 };
 
 } /* namespace flowgraph */
+} /* namespace oboe */
 
 #endif //FLOWGRAPH_SOURCE_I24_H