diff --git a/tools/aapt2/compile/NinePatch.cpp b/tools/aapt2/compile/NinePatch.cpp
index c931da4..4538ecc 100644
--- a/tools/aapt2/compile/NinePatch.cpp
+++ b/tools/aapt2/compile/NinePatch.cpp
@@ -218,11 +218,9 @@
 
 static bool PopulateBounds(const std::vector<Range>& padding,
                            const std::vector<Range>& layout_bounds,
-                           const std::vector<Range>& stretch_regions,
-                           const int32_t length, int32_t* padding_start,
-                           int32_t* padding_end, int32_t* layout_start,
-                           int32_t* layout_end, const StringPiece& edge_name,
-                           std::string* out_err) {
+                           const std::vector<Range>& stretch_regions, const int32_t length,
+                           int32_t* padding_start, int32_t* padding_end, int32_t* layout_start,
+                           int32_t* layout_end, StringPiece edge_name, std::string* out_err) {
   if (padding.size() > 1) {
     std::stringstream err_stream;
     err_stream << "too many padding sections on " << edge_name << " border";
diff --git a/tools/aapt2/compile/Png.h b/tools/aapt2/compile/Png.h
index 7f8d923..a8b7dd1 100644
--- a/tools/aapt2/compile/Png.h
+++ b/tools/aapt2/compile/Png.h
@@ -59,7 +59,7 @@
  */
 class PngChunkFilter : public io::InputStream {
  public:
-  explicit PngChunkFilter(const android::StringPiece& data);
+  explicit PngChunkFilter(android::StringPiece data);
   virtual ~PngChunkFilter() = default;
 
   bool Next(const void** buffer, size_t* len) override;
diff --git a/tools/aapt2/compile/PngChunkFilter.cpp b/tools/aapt2/compile/PngChunkFilter.cpp
index 4db2392..2e55d0c 100644
--- a/tools/aapt2/compile/PngChunkFilter.cpp
+++ b/tools/aapt2/compile/PngChunkFilter.cpp
@@ -70,7 +70,7 @@
   }
 }
 
-PngChunkFilter::PngChunkFilter(const StringPiece& data) : data_(data) {
+PngChunkFilter::PngChunkFilter(StringPiece data) : data_(data) {
   if (util::StartsWith(data_, kPngSignature)) {
     window_start_ = 0;
     window_end_ = kPngSignatureSize;
diff --git a/tools/aapt2/compile/Pseudolocalizer.cpp b/tools/aapt2/compile/Pseudolocalizer.cpp
index 3a515fa..463ce78 100644
--- a/tools/aapt2/compile/Pseudolocalizer.cpp
+++ b/tools/aapt2/compile/Pseudolocalizer.cpp
@@ -20,36 +20,42 @@
 
 using android::StringPiece;
 
+using namespace std::literals;
+
 namespace aapt {
 
 // String basis to generate expansion
-static const std::string kExpansionString =
+static constexpr auto kExpansionString =
     "one two three "
     "four five six seven eight nine ten eleven twelve thirteen "
-    "fourteen fiveteen sixteen seventeen nineteen twenty";
+    "fourteen fiveteen sixteen seventeen nineteen twenty"sv;
 
 // Special unicode characters to override directionality of the words
-static const std::string kRlm = "\u200f";
-static const std::string kRlo = "\u202e";
-static const std::string kPdf = "\u202c";
+static constexpr auto kRlm = "\u200f"sv;
+static constexpr auto kRlo = "\u202e"sv;
+static constexpr auto kPdf = "\u202c"sv;
 
 // Placeholder marks
-static const std::string kPlaceholderOpen = "\u00bb";
-static const std::string kPlaceholderClose = "\u00ab";
+static constexpr auto kPlaceholderOpen = "\u00bb"sv;
+static constexpr auto kPlaceholderClose = "\u00ab"sv;
 
 static const char kArgStart = '{';
 static const char kArgEnd = '}';
 
 class PseudoMethodNone : public PseudoMethodImpl {
  public:
-  std::string Text(const StringPiece& text) override { return text.to_string(); }
-  std::string Placeholder(const StringPiece& text) override { return text.to_string(); }
+  std::string Text(StringPiece text) override {
+    return std::string(text);
+  }
+  std::string Placeholder(StringPiece text) override {
+    return std::string(text);
+  }
 };
 
 class PseudoMethodBidi : public PseudoMethodImpl {
  public:
-  std::string Text(const StringPiece& text) override;
-  std::string Placeholder(const StringPiece& text) override;
+  std::string Text(StringPiece text) override;
+  std::string Placeholder(StringPiece text) override;
 };
 
 class PseudoMethodAccent : public PseudoMethodImpl {
@@ -57,8 +63,8 @@
   PseudoMethodAccent() : depth_(0), word_count_(0), length_(0) {}
   std::string Start() override;
   std::string End() override;
-  std::string Text(const StringPiece& text) override;
-  std::string Placeholder(const StringPiece& text) override;
+  std::string Text(StringPiece text) override;
+  std::string Placeholder(StringPiece text) override;
 
  private:
   size_t depth_;
@@ -84,7 +90,7 @@
   }
 }
 
-std::string Pseudolocalizer::Text(const StringPiece& text) {
+std::string Pseudolocalizer::Text(StringPiece text) {
   std::string out;
   size_t depth = last_depth_;
   size_t lastpos, pos;
@@ -116,7 +122,7 @@
       }
       size_t size = nextpos - lastpos;
       if (size) {
-        std::string chunk = text.substr(lastpos, size).to_string();
+        std::string chunk(text.substr(lastpos, size));
         if (pseudo) {
           chunk = impl_->Text(chunk);
         } else if (str[lastpos] == kArgStart && str[nextpos - 1] == kArgEnd) {
@@ -301,21 +307,23 @@
 }
 
 static std::string PseudoGenerateExpansion(const unsigned int length) {
-  std::string result = kExpansionString;
-  const char* s = result.data();
+  std::string result(kExpansionString);
   if (result.size() < length) {
     result += " ";
     result += PseudoGenerateExpansion(length - result.size());
   } else {
     int ext = 0;
     // Should contain only whole words, so looking for a space
-    for (unsigned int i = length + 1; i < result.size(); ++i) {
-      ++ext;
-      if (s[i] == ' ') {
-        break;
+    {
+      const char* const s = result.data();
+      for (unsigned int i = length + 1; i < result.size(); ++i) {
+        ++ext;
+        if (s[i] == ' ') {
+          break;
+        }
       }
     }
-    result = result.substr(0, length + ext);
+    result.resize(length + ext);
   }
   return result;
 }
@@ -349,7 +357,7 @@
  *
  * Note: This leaves placeholder syntax untouched.
  */
-std::string PseudoMethodAccent::Text(const StringPiece& source) {
+std::string PseudoMethodAccent::Text(StringPiece source) {
   const char* s = source.data();
   std::string result;
   const size_t I = source.size();
@@ -435,12 +443,12 @@
   return result;
 }
 
-std::string PseudoMethodAccent::Placeholder(const StringPiece& source) {
+std::string PseudoMethodAccent::Placeholder(StringPiece source) {
   // Surround a placeholder with brackets
-  return kPlaceholderOpen + source.to_string() + kPlaceholderClose;
+  return (std::string(kPlaceholderOpen) += source) += kPlaceholderClose;
 }
 
-std::string PseudoMethodBidi::Text(const StringPiece& source) {
+std::string PseudoMethodBidi::Text(StringPiece source) {
   const char* s = source.data();
   std::string result;
   bool lastspace = true;
@@ -456,10 +464,10 @@
     space = (!escape && isspace(c)) || (escape && (c == 'n' || c == 't'));
     if (lastspace && !space) {
       // Word start
-      result += kRlm + kRlo;
+      (result += kRlm) += kRlo;
     } else if (!lastspace && space) {
       // Word end
-      result += kPdf + kRlm;
+      (result += kPdf) += kRlm;
     }
     lastspace = space;
     if (escape) {
@@ -470,14 +478,14 @@
   }
   if (!lastspace) {
     // End of last word
-    result += kPdf + kRlm;
+    (result += kPdf) += kRlm;
   }
   return result;
 }
 
-std::string PseudoMethodBidi::Placeholder(const StringPiece& source) {
+std::string PseudoMethodBidi::Placeholder(StringPiece source) {
   // Surround a placeholder with directionality change sequence
-  return kRlm + kRlo + source.to_string() + kPdf + kRlm;
+  return (((std::string(kRlm) += kRlo) += source) += kPdf) += kRlm;
 }
 
 }  // namespace aapt
diff --git a/tools/aapt2/compile/Pseudolocalizer.h b/tools/aapt2/compile/Pseudolocalizer.h
index 4dedc70..2b94bcc 100644
--- a/tools/aapt2/compile/Pseudolocalizer.h
+++ b/tools/aapt2/compile/Pseudolocalizer.h
@@ -31,8 +31,8 @@
   virtual ~PseudoMethodImpl() {}
   virtual std::string Start() { return {}; }
   virtual std::string End() { return {}; }
-  virtual std::string Text(const android::StringPiece& text) = 0;
-  virtual std::string Placeholder(const android::StringPiece& text) = 0;
+  virtual std::string Text(android::StringPiece text) = 0;
+  virtual std::string Placeholder(android::StringPiece text) = 0;
 };
 
 class Pseudolocalizer {
@@ -47,7 +47,7 @@
   void SetMethod(Method method);
   std::string Start() { return impl_->Start(); }
   std::string End() { return impl_->End(); }
-  std::string Text(const android::StringPiece& text);
+  std::string Text(android::StringPiece text);
 
  private:
   std::unique_ptr<PseudoMethodImpl> impl_;