diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 8105626..ab7ef16 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -796,7 +796,7 @@
     bool ok = true;
     while (!tokenizer->isEol()) {
         String8 token = tokenizer->nextToken(" ");
-        if (token.isEmpty()) {
+        if (token.empty()) {
             tokenizer->skipDelimiters(" ");
             continue;
         }
diff --git a/libs/gui/tests/GLTest.cpp b/libs/gui/tests/GLTest.cpp
index 73e8fbe..449cbf9 100644
--- a/libs/gui/tests/GLTest.cpp
+++ b/libs/gui/tests/GLTest.cpp
@@ -191,24 +191,24 @@
         msg += String8::format("r(%d isn't %d)", pixel[0], r);
     }
     if (g >= 0 && abs(g - int(pixel[1])) > tolerance) {
-        if (!msg.isEmpty()) {
+        if (!msg.empty()) {
             msg += " ";
         }
         msg += String8::format("g(%d isn't %d)", pixel[1], g);
     }
     if (b >= 0 && abs(b - int(pixel[2])) > tolerance) {
-        if (!msg.isEmpty()) {
+        if (!msg.empty()) {
             msg += " ";
         }
         msg += String8::format("b(%d isn't %d)", pixel[2], b);
     }
     if (a >= 0 && abs(a - int(pixel[3])) > tolerance) {
-        if (!msg.isEmpty()) {
+        if (!msg.empty()) {
             msg += " ";
         }
         msg += String8::format("a(%d isn't %d)", pixel[3], a);
     }
-    if (!msg.isEmpty()) {
+    if (!msg.empty()) {
         return ::testing::AssertionFailure(::testing::Message(msg.c_str()));
     } else {
         return ::testing::AssertionSuccess();
@@ -223,24 +223,24 @@
         msg += String8::format("left(%d isn't %d)", r1.left, r2.left);
     }
     if (abs(r1.top - r2.top) > tolerance) {
-        if (!msg.isEmpty()) {
+        if (!msg.empty()) {
             msg += " ";
         }
         msg += String8::format("top(%d isn't %d)", r1.top, r2.top);
     }
     if (abs(r1.right - r2.right) > tolerance) {
-        if (!msg.isEmpty()) {
+        if (!msg.empty()) {
             msg += " ";
         }
         msg += String8::format("right(%d isn't %d)", r1.right, r2.right);
     }
     if (abs(r1.bottom - r2.bottom) > tolerance) {
-        if (!msg.isEmpty()) {
+        if (!msg.empty()) {
             msg += " ";
         }
         msg += String8::format("bottom(%d isn't %d)", r1.bottom, r2.bottom);
     }
-    if (!msg.isEmpty()) {
+    if (!msg.empty()) {
         msg += String8::format(" R1: [%d %d %d %d] R2: [%d %d %d %d]",
                                r1.left, r1.top, r1.right, r1.bottom,
                                r2.left, r2.top, r2.right, r2.bottom);
diff --git a/libs/input/KeyCharacterMap.cpp b/libs/input/KeyCharacterMap.cpp
index 7a379f5..f98de34 100644
--- a/libs/input/KeyCharacterMap.cpp
+++ b/libs/input/KeyCharacterMap.cpp
@@ -1345,7 +1345,7 @@
     }
 
     // Ensure that we consumed the entire token.
-    if (mTokenizer->nextToken(WHITESPACE).isEmpty()) {
+    if (mTokenizer->nextToken(WHITESPACE).empty()) {
         return NO_ERROR;
     }
 
diff --git a/libs/input/PropertyMap.cpp b/libs/input/PropertyMap.cpp
index fc020ca..9f72c86 100644
--- a/libs/input/PropertyMap.cpp
+++ b/libs/input/PropertyMap.cpp
@@ -155,7 +155,7 @@
 
         if (!mTokenizer->isEol() && mTokenizer->peekChar() != '#') {
             String8 keyToken = mTokenizer->nextToken(WHITESPACE_OR_PROPERTY_DELIMITER);
-            if (keyToken.isEmpty()) {
+            if (keyToken.empty()) {
                 ALOGE("%s: Expected non-empty property key.", mTokenizer->getLocation().c_str());
                 return BAD_VALUE;
             }
diff --git a/libs/input/VirtualKeyMap.cpp b/libs/input/VirtualKeyMap.cpp
index de62c87..8b8af42 100644
--- a/libs/input/VirtualKeyMap.cpp
+++ b/libs/input/VirtualKeyMap.cpp
@@ -146,7 +146,7 @@
     String8 token = mTokenizer->nextToken(WHITESPACE_OR_FIELD_DELIMITER);
     char* end;
     *outValue = strtol(token.c_str(), &end, 0);
-    if (token.isEmpty() || *end != '\0') {
+    if (token.empty() || *end != '\0') {
         ALOGE("Expected an integer, got '%s'.", token.c_str());
         return false;
     }
diff --git a/services/sensorservice/SensorService.cpp b/services/sensorservice/SensorService.cpp
index 260e61a..4083651 100644
--- a/services/sensorservice/SensorService.cpp
+++ b/services/sensorservice/SensorService.cpp
@@ -531,7 +531,7 @@
             for (auto&& i : mRecentEvent) {
                 sp<SensorInterface> s = mSensors.getInterface(i.first);
                 if (!i.second->isEmpty()) {
-                    if (privileged || s->getSensor().getRequiredPermission().isEmpty()) {
+                    if (privileged || s->getSensor().getRequiredPermission().empty()) {
                         i.second->setFormat("normal");
                     } else {
                         i.second->setFormat("mask_data");
@@ -649,7 +649,7 @@
     for (auto&& i : mRecentEvent) {
         sp<SensorInterface> s = mSensors.getInterface(i.first);
         if (!i.second->isEmpty()) {
-            i.second->setFormat(privileged || s->getSensor().getRequiredPermission().isEmpty() ?
+            i.second->setFormat(privileged || s->getSensor().getRequiredPermission().empty() ?
                     "normal" : "mask_data");
             const uint64_t mToken = proto.start(service::SensorEventsProto::RECENT_EVENTS_LOGS);
             proto.write(service::SensorEventsProto::RecentEventsLog::NAME,