diff --git a/cmds/stagefright/SimplePlayer.cpp b/cmds/stagefright/SimplePlayer.cpp
index 1b2f792..4b2f980 100644
--- a/cmds/stagefright/SimplePlayer.cpp
+++ b/cmds/stagefright/SimplePlayer.cpp
@@ -332,7 +332,7 @@
 
         size_t j = 0;
         sp<ABuffer> buffer;
-        while (format->findBuffer(StringPrintf("csd-%d", j).c_str(), &buffer)) {
+        while (format->findBuffer(AStringPrintf("csd-%d", j).c_str(), &buffer)) {
             state->mCSD.push_back(buffer);
 
             ++j;
diff --git a/include/media/stagefright/foundation/AString.h b/include/media/stagefright/foundation/AString.h
index c3a68e1..822dbb3 100644
--- a/include/media/stagefright/foundation/AString.h
+++ b/include/media/stagefright/foundation/AString.h
@@ -102,7 +102,7 @@
     void makeMutable();
 };
 
-AString StringPrintf(const char *format, ...);
+AString AStringPrintf(const char *format, ...);
 
 }  // namespace android
 
diff --git a/media/libstagefright/MediaCodec.cpp b/media/libstagefright/MediaCodec.cpp
index c2381b4..eb323a4 100644
--- a/media/libstagefright/MediaCodec.cpp
+++ b/media/libstagefright/MediaCodec.cpp
@@ -1706,7 +1706,7 @@
     size_t i = 0;
     for (;;) {
         sp<ABuffer> csd;
-        if (!format->findBuffer(StringPrintf("csd-%u", i).c_str(), &csd)) {
+        if (!format->findBuffer(AStringPrintf("csd-%u", i).c_str(), &csd)) {
             break;
         }
 
@@ -2229,7 +2229,7 @@
             memcpy(csd->data() + 4, nalStart, nalSize);
 
             mOutputFormat->setBuffer(
-                    StringPrintf("csd-%u", csdIndex).c_str(), csd);
+                    AStringPrintf("csd-%u", csdIndex).c_str(), csd);
 
             ++csdIndex;
         }
diff --git a/media/libstagefright/foundation/AMessage.cpp b/media/libstagefright/foundation/AMessage.cpp
index 795e8a6..1f46bc9 100644
--- a/media/libstagefright/foundation/AMessage.cpp
+++ b/media/libstagefright/foundation/AMessage.cpp
@@ -426,19 +426,19 @@
 
     AString tmp;
     if (isFourcc(mWhat)) {
-        tmp = StringPrintf(
+        tmp = AStringPrintf(
                 "'%c%c%c%c'",
                 (char)(mWhat >> 24),
                 (char)((mWhat >> 16) & 0xff),
                 (char)((mWhat >> 8) & 0xff),
                 (char)(mWhat & 0xff));
     } else {
-        tmp = StringPrintf("0x%08x", mWhat);
+        tmp = AStringPrintf("0x%08x", mWhat);
     }
     s.append(tmp);
 
     if (mTarget != 0) {
-        tmp = StringPrintf(", target = %d", mTarget);
+        tmp = AStringPrintf(", target = %d", mTarget);
         s.append(tmp);
     }
     s.append(") = {\n");
@@ -448,37 +448,37 @@
 
         switch (item.mType) {
             case kTypeInt32:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "int32_t %s = %d", item.mName, item.u.int32Value);
                 break;
             case kTypeInt64:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "int64_t %s = %lld", item.mName, item.u.int64Value);
                 break;
             case kTypeSize:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "size_t %s = %d", item.mName, item.u.sizeValue);
                 break;
             case kTypeFloat:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "float %s = %f", item.mName, item.u.floatValue);
                 break;
             case kTypeDouble:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "double %s = %f", item.mName, item.u.doubleValue);
                 break;
             case kTypePointer:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "void *%s = %p", item.mName, item.u.ptrValue);
                 break;
             case kTypeString:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "string %s = \"%s\"",
                         item.mName,
                         item.u.stringValue->c_str());
                 break;
             case kTypeObject:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "RefBase *%s = %p", item.mName, item.u.refValue);
                 break;
             case kTypeBuffer:
@@ -486,18 +486,18 @@
                 sp<ABuffer> buffer = static_cast<ABuffer *>(item.u.refValue);
 
                 if (buffer != NULL && buffer->data() != NULL && buffer->size() <= 64) {
-                    tmp = StringPrintf("Buffer %s = {\n", item.mName);
+                    tmp = AStringPrintf("Buffer %s = {\n", item.mName);
                     hexdump(buffer->data(), buffer->size(), indent + 4, &tmp);
                     appendIndent(&tmp, indent + 2);
                     tmp.append("}");
                 } else {
-                    tmp = StringPrintf(
+                    tmp = AStringPrintf(
                             "Buffer *%s = %p", item.mName, buffer.get());
                 }
                 break;
             }
             case kTypeMessage:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "AMessage %s = %s",
                         item.mName,
                         static_cast<AMessage *>(
@@ -505,7 +505,7 @@
                                 indent + strlen(item.mName) + 14).c_str());
                 break;
             case kTypeRect:
-                tmp = StringPrintf(
+                tmp = AStringPrintf(
                         "Rect %s(%d, %d, %d, %d)",
                         item.mName,
                         item.u.rectValue.mLeft,
diff --git a/media/libstagefright/foundation/ANetworkSession.cpp b/media/libstagefright/foundation/ANetworkSession.cpp
index 4504c2b..b230400 100644
--- a/media/libstagefright/foundation/ANetworkSession.cpp
+++ b/media/libstagefright/foundation/ANetworkSession.cpp
@@ -187,7 +187,7 @@
         CHECK_GE(res, 0);
 
         in_addr_t addr = ntohl(localAddr.sin_addr.s_addr);
-        AString localAddrString = StringPrintf(
+        AString localAddrString = AStringPrintf(
                 "%d.%d.%d.%d",
                 (addr >> 24),
                 (addr >> 16) & 0xff,
@@ -195,7 +195,7 @@
                 addr & 0xff);
 
         addr = ntohl(remoteAddr.sin_addr.s_addr);
-        AString remoteAddrString = StringPrintf(
+        AString remoteAddrString = AStringPrintf(
                 "%d.%d.%d.%d",
                 (addr >> 24),
                 (addr >> 16) & 0xff,
@@ -301,7 +301,7 @@
                 uint32_t ip = ntohl(remoteAddr.sin_addr.s_addr);
                 notify->setString(
                         "fromAddr",
-                        StringPrintf(
+                        AStringPrintf(
                             "%u.%u.%u.%u",
                             ip >> 24,
                             (ip >> 16) & 0xff,
diff --git a/media/libstagefright/foundation/AString.cpp b/media/libstagefright/foundation/AString.cpp
index 9835ca3..b167543 100644
--- a/media/libstagefright/foundation/AString.cpp
+++ b/media/libstagefright/foundation/AString.cpp
@@ -366,7 +366,7 @@
     return err;
 }
 
-AString StringPrintf(const char *format, ...) {
+AString AStringPrintf(const char *format, ...) {
     va_list ap;
     va_start(ap, format);
 
diff --git a/media/libstagefright/httplive/LiveSession.cpp b/media/libstagefright/httplive/LiveSession.cpp
index d3f25a1..c25f3d4 100644
--- a/media/libstagefright/httplive/LiveSession.cpp
+++ b/media/libstagefright/httplive/LiveSession.cpp
@@ -846,11 +846,11 @@
                 headers.add(
                         String8("Range"),
                         String8(
-                            StringPrintf(
+                            AStringPrintf(
                                 "bytes=%lld-%s",
                                 range_offset,
                                 range_length < 0
-                                    ? "" : StringPrintf("%lld",
+                                    ? "" : AStringPrintf("%lld",
                                             range_offset + range_length - 1).c_str()).c_str()));
             }
             status_t err = mHTTPDataSource->connect(url, &headers);
diff --git a/media/libstagefright/rtsp/ARTPWriter.cpp b/media/libstagefright/rtsp/ARTPWriter.cpp
index 793d116..e1607bf 100644
--- a/media/libstagefright/rtsp/ARTPWriter.cpp
+++ b/media/libstagefright/rtsp/ARTPWriter.cpp
@@ -461,7 +461,7 @@
         sdp.append("m=audio ");
     }
 
-    sdp.append(StringPrintf("%d", ntohs(mRTPAddr.sin_port)));
+    sdp.append(AStringPrintf("%d", ntohs(mRTPAddr.sin_port)));
     sdp.append(
           " RTP/AVP " PT_STR "\r\n"
           "b=AS 320000\r\n"
@@ -480,7 +480,7 @@
         CHECK_EQ(sampleRate, (mMode == AMR_NB) ? 8000 : 16000);
 
         sdp.append(mMode == AMR_NB ? "AMR" : "AMR-WB");
-        sdp.append(StringPrintf("/%d/%d", sampleRate, numChannels));
+        sdp.append(AStringPrintf("/%d/%d", sampleRate, numChannels));
     } else {
         TRESPASS();
     }
@@ -543,7 +543,7 @@
     CHECK_EQ((unsigned)data[0], 0x67u);
 
     mProfileLevel =
-        StringPrintf("%02X%02X%02X", data[1], data[2], data[3]);
+        AStringPrintf("%02X%02X%02X", data[1], data[2], data[3]);
 
     encodeBase64(data, startCodePos, &mSeqParamSet);
 
diff --git a/media/libstagefright/rtsp/ARTSPConnection.cpp b/media/libstagefright/rtsp/ARTSPConnection.cpp
index f25539c..60b3aaf 100644
--- a/media/libstagefright/rtsp/ARTSPConnection.cpp
+++ b/media/libstagefright/rtsp/ARTSPConnection.cpp
@@ -42,7 +42,7 @@
 
 // static
 const AString ARTSPConnection::sUserAgent =
-    StringPrintf("User-Agent: %s\r\n", MakeUserAgent().c_str());
+    AStringPrintf("User-Agent: %s\r\n", MakeUserAgent().c_str());
 
 ARTSPConnection::ARTSPConnection(bool uidValid, uid_t uid)
     : mUIDValid(uidValid),
diff --git a/media/libstagefright/rtsp/MyHandler.h b/media/libstagefright/rtsp/MyHandler.h
index 423a420..3bf489b 100644
--- a/media/libstagefright/rtsp/MyHandler.h
+++ b/media/libstagefright/rtsp/MyHandler.h
@@ -156,7 +156,7 @@
             mSessionURL.append("rtsp://");
             mSessionURL.append(host);
             mSessionURL.append(":");
-            mSessionURL.append(StringPrintf("%u", port));
+            mSessionURL.append(AStringPrintf("%u", port));
             mSessionURL.append(path);
 
             ALOGV("rewritten session url: '%s'", mSessionURL.c_str());
@@ -508,7 +508,7 @@
                             mSessionURL.append("rtsp://");
                             mSessionURL.append(host);
                             mSessionURL.append(":");
-                            mSessionURL.append(StringPrintf("%u", port));
+                            mSessionURL.append(AStringPrintf("%u", port));
                             mSessionURL.append(path);
 
                             ALOGI("rewritten session url: '%s'", mSessionURL.c_str());
@@ -1238,7 +1238,7 @@
                 request.append("\r\n");
 
                 request.append(
-                        StringPrintf(
+                        AStringPrintf(
                             "Range: npt=%lld-\r\n", timeUs / 1000000ll));
 
                 request.append("\r\n");
diff --git a/media/libstagefright/timedtext/test/TimedTextSRTSource_test.cpp b/media/libstagefright/timedtext/test/TimedTextSRTSource_test.cpp
index 40e93c7..3a06d61 100644
--- a/media/libstagefright/timedtext/test/TimedTextSRTSource_test.cpp
+++ b/media/libstagefright/timedtext/test/TimedTextSRTSource_test.cpp
@@ -120,26 +120,26 @@
         err = mSource->read(&startTimeUs, &endTimeUs, &parcel);
         EXPECT_EQ(OK, err);
         CheckStartTimeMs(parcel, i * kSecToMsec);
-        subtitle = StringPrintf("%d\n\n", i);
+        subtitle = AStringPrintf("%d\n\n", i);
         CheckDataEquals(parcel, subtitle.c_str());
     }
     // read edge cases
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel);
     EXPECT_EQ(OK, err);
     CheckStartTimeMs(parcel, 5500);
-    subtitle = StringPrintf("6\n\n");
+    subtitle = AStringPrintf("6\n\n");
     CheckDataEquals(parcel, subtitle.c_str());
 
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel);
     EXPECT_EQ(OK, err);
     CheckStartTimeMs(parcel, 5800);
-    subtitle = StringPrintf("7\n\n");
+    subtitle = AStringPrintf("7\n\n");
     CheckDataEquals(parcel, subtitle.c_str());
 
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel);
     EXPECT_EQ(OK, err);
     CheckStartTimeMs(parcel, 6000);
-    subtitle = StringPrintf("8\n\n");
+    subtitle = AStringPrintf("8\n\n");
     CheckDataEquals(parcel, subtitle.c_str());
 
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel);
@@ -202,21 +202,21 @@
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel, &options);
     EXPECT_EQ(OK, err);
     EXPECT_EQ(5500 * kMsecToUsec, startTimeUs);
-    subtitle = StringPrintf("6\n\n");
+    subtitle = AStringPrintf("6\n\n");
     CheckDataEquals(parcel, subtitle.c_str());
 
     options.setSeekTo(5800 * kMsecToUsec, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel, &options);
     EXPECT_EQ(OK, err);
     EXPECT_EQ(5800 * kMsecToUsec, startTimeUs);
-    subtitle = StringPrintf("7\n\n");
+    subtitle = AStringPrintf("7\n\n");
     CheckDataEquals(parcel, subtitle.c_str());
 
     options.setSeekTo(6000 * kMsecToUsec, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
     err = mSource->read(&startTimeUs, &endTimeUs, &parcel, &options);
     EXPECT_EQ(OK, err);
     EXPECT_EQ(6000 * kMsecToUsec, startTimeUs);
-    subtitle = StringPrintf("8\n\n");
+    subtitle = AStringPrintf("8\n\n");
     CheckDataEquals(parcel, subtitle.c_str());
 }
 
diff --git a/media/libstagefright/wifi-display/VideoFormats.cpp b/media/libstagefright/wifi-display/VideoFormats.cpp
index 04e02c1..2f4af5b 100644
--- a/media/libstagefright/wifi-display/VideoFormats.cpp
+++ b/media/libstagefright/wifi-display/VideoFormats.cpp
@@ -435,7 +435,7 @@
     //   max-hres (none or 2 byte)
     //   max-vres (none or 2 byte)
 
-    return StringPrintf(
+    return AStringPrintf(
             "%02x 00 %02x %02x %08x %08x %08x 00 0000 0000 00 none none",
             forM4Message ? 0x00 : ((mNativeIndex << 3) | mNativeType),
             mConfigs[mNativeType][mNativeIndex].profile,
diff --git a/media/libstagefright/wifi-display/source/TSPacketizer.cpp b/media/libstagefright/wifi-display/source/TSPacketizer.cpp
index 50d317a..4c5ad17 100644
--- a/media/libstagefright/wifi-display/source/TSPacketizer.cpp
+++ b/media/libstagefright/wifi-display/source/TSPacketizer.cpp
@@ -106,7 +106,7 @@
             || !strcasecmp(mMIME.c_str(), MEDIA_MIMETYPE_AUDIO_AAC)) {
         for (size_t i = 0;; ++i) {
             sp<ABuffer> csd;
-            if (!mFormat->findBuffer(StringPrintf("csd-%d", i).c_str(), &csd)) {
+            if (!mFormat->findBuffer(AStringPrintf("csd-%d", i).c_str(), &csd)) {
                 break;
             }
 
diff --git a/media/libstagefright/wifi-display/source/WifiDisplaySource.cpp b/media/libstagefright/wifi-display/source/WifiDisplaySource.cpp
index 0c39ccf..7eb8b73 100644
--- a/media/libstagefright/wifi-display/source/WifiDisplaySource.cpp
+++ b/media/libstagefright/wifi-display/source/WifiDisplaySource.cpp
@@ -598,7 +598,7 @@
     AppendCommonResponse(&request, mNextCSeq);
 
     request.append("Content-Type: text/parameters\r\n");
-    request.append(StringPrintf("Content-Length: %d\r\n", body.size()));
+    request.append(AStringPrintf("Content-Length: %d\r\n", body.size()));
     request.append("\r\n");
     request.append(body);
 
@@ -639,26 +639,26 @@
 
     if (mSinkSupportsAudio) {
         body.append(
-                StringPrintf("wfd_audio_codecs: %s\r\n",
+                AStringPrintf("wfd_audio_codecs: %s\r\n",
                              (mUsingPCMAudio
                                 ? "LPCM 00000002 00" // 2 ch PCM 48kHz
                                 : "AAC 00000001 00")));  // 2 ch AAC 48kHz
     }
 
     body.append(
-            StringPrintf(
+            AStringPrintf(
                 "wfd_presentation_URL: rtsp://%s/wfd1.0/streamid=0 none\r\n",
                 mClientInfo.mLocalIP.c_str()));
 
     body.append(
-            StringPrintf(
+            AStringPrintf(
                 "wfd_client_rtp_ports: %s\r\n", mWfdClientRtpPorts.c_str()));
 
     AString request = "SET_PARAMETER rtsp://localhost/wfd1.0 RTSP/1.0\r\n";
     AppendCommonResponse(&request, mNextCSeq);
 
     request.append("Content-Type: text/parameters\r\n");
-    request.append(StringPrintf("Content-Length: %d\r\n", body.size()));
+    request.append(AStringPrintf("Content-Length: %d\r\n", body.size()));
     request.append("\r\n");
     request.append(body);
 
@@ -704,7 +704,7 @@
     AppendCommonResponse(&request, mNextCSeq);
 
     request.append("Content-Type: text/parameters\r\n");
-    request.append(StringPrintf("Content-Length: %d\r\n", body.size()));
+    request.append(AStringPrintf("Content-Length: %d\r\n", body.size()));
     request.append("\r\n");
     request.append(body);
 
@@ -729,7 +729,7 @@
 
     CHECK_EQ(sessionID, mClientSessionID);
     request.append(
-            StringPrintf("Session: %d\r\n", mClientInfo.mPlaybackSessionID));
+            AStringPrintf("Session: %d\r\n", mClientInfo.mPlaybackSessionID));
     request.append("\r\n");  // Empty body
 
     status_t err =
@@ -1305,7 +1305,7 @@
 
     if (rtpMode == RTPSender::TRANSPORT_TCP_INTERLEAVED) {
         response.append(
-                StringPrintf(
+                AStringPrintf(
                     "Transport: RTP/AVP/TCP;interleaved=%d-%d;",
                     clientRtp, clientRtcp));
     } else {
@@ -1318,14 +1318,14 @@
 
         if (clientRtcp >= 0) {
             response.append(
-                    StringPrintf(
+                    AStringPrintf(
                         "Transport: RTP/AVP/%s;unicast;client_port=%d-%d;"
                         "server_port=%d-%d\r\n",
                         transportString.c_str(),
                         clientRtp, clientRtcp, serverRtp, serverRtp + 1));
         } else {
             response.append(
-                    StringPrintf(
+                    AStringPrintf(
                         "Transport: RTP/AVP/%s;unicast;client_port=%d;"
                         "server_port=%d\r\n",
                         transportString.c_str(),
@@ -1585,15 +1585,15 @@
     response->append(buf);
     response->append("\r\n");
 
-    response->append(StringPrintf("Server: %s\r\n", sUserAgent.c_str()));
+    response->append(AStringPrintf("Server: %s\r\n", sUserAgent.c_str()));
 
     if (cseq >= 0) {
-        response->append(StringPrintf("CSeq: %d\r\n", cseq));
+        response->append(AStringPrintf("CSeq: %d\r\n", cseq));
     }
 
     if (playbackSessionID >= 0ll) {
         response->append(
-                StringPrintf(
+                AStringPrintf(
                     "Session: %d;timeout=%lld\r\n",
                     playbackSessionID, kPlaybackSessionTimeoutSecs));
     }