diff --git a/libs/hwui/AnimationContext.h b/libs/hwui/AnimationContext.h
index 909ed36..395dc73 100644
--- a/libs/hwui/AnimationContext.h
+++ b/libs/hwui/AnimationContext.h
@@ -57,7 +57,7 @@
 
 private:
     friend class AnimationContext;
-    AnimationHandle(AnimationContext& context);
+    explicit AnimationHandle(AnimationContext& context);
     AnimationHandle(RenderNode& animatingNode, AnimationContext& context);
     ~AnimationHandle();
 
@@ -75,7 +75,7 @@
 class AnimationContext {
     PREVENT_COPY_AND_ASSIGN(AnimationContext);
 public:
-    ANDROID_API AnimationContext(renderthread::TimeLord& clock);
+    ANDROID_API explicit AnimationContext(renderthread::TimeLord& clock);
     ANDROID_API virtual ~AnimationContext();
 
     nsecs_t frameTimeMs() { return mFrameTimeMs; }
diff --git a/libs/hwui/AnimatorManager.h b/libs/hwui/AnimatorManager.h
index 61f6179..8e6f820 100644
--- a/libs/hwui/AnimatorManager.h
+++ b/libs/hwui/AnimatorManager.h
@@ -35,7 +35,7 @@
 class AnimatorManager {
     PREVENT_COPY_AND_ASSIGN(AnimatorManager);
 public:
-    AnimatorManager(RenderNode& parent);
+    explicit AnimatorManager(RenderNode& parent);
     ~AnimatorManager();
 
     void addAnimator(const sp<BaseRenderNodeAnimator>& animator);
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index eac9359..317c122 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -77,7 +77,7 @@
         return sInstance != nullptr;
     }
 private:
-    Caches(RenderState& renderState);
+    explicit Caches(RenderState& renderState);
     static Caches* sInstance;
 
 public:
diff --git a/libs/hwui/CanvasProperty.h b/libs/hwui/CanvasProperty.h
index 6074394..56671bb 100644
--- a/libs/hwui/CanvasProperty.h
+++ b/libs/hwui/CanvasProperty.h
@@ -28,7 +28,7 @@
 class CanvasPropertyPrimitive : public VirtualLightRefBase {
     PREVENT_COPY_AND_ASSIGN(CanvasPropertyPrimitive);
 public:
-    CanvasPropertyPrimitive(float initialValue) : value(initialValue) {}
+    explicit CanvasPropertyPrimitive(float initialValue) : value(initialValue) {}
 
     float value;
 };
@@ -36,7 +36,7 @@
 class CanvasPropertyPaint : public VirtualLightRefBase {
     PREVENT_COPY_AND_ASSIGN(CanvasPropertyPaint);
 public:
-    CanvasPropertyPaint(const SkPaint& initialValue) : value(initialValue) {}
+    explicit CanvasPropertyPaint(const SkPaint& initialValue) : value(initialValue) {}
 
     SkPaint value;
 };
diff --git a/libs/hwui/CanvasState.h b/libs/hwui/CanvasState.h
index b9e87ae..22feef5 100644
--- a/libs/hwui/CanvasState.h
+++ b/libs/hwui/CanvasState.h
@@ -73,7 +73,7 @@
 
 class CanvasState {
 public:
-    CanvasState(CanvasStateClient& renderer);
+    explicit CanvasState(CanvasStateClient& renderer);
     ~CanvasState();
 
     /**
diff --git a/libs/hwui/DeferredDisplayList.h b/libs/hwui/DeferredDisplayList.h
index 98ccf11..15703ea 100644
--- a/libs/hwui/DeferredDisplayList.h
+++ b/libs/hwui/DeferredDisplayList.h
@@ -77,7 +77,7 @@
 class DeferredDisplayList {
     friend struct DeferStateStruct; // used to give access to allocator
 public:
-    DeferredDisplayList(const Rect& bounds)
+    explicit DeferredDisplayList(const Rect& bounds)
             : mBounds(bounds) {
         clear();
     }
diff --git a/libs/hwui/Dither.h b/libs/hwui/Dither.h
index b589b80..6af3e83 100644
--- a/libs/hwui/Dither.h
+++ b/libs/hwui/Dither.h
@@ -37,7 +37,7 @@
  */
 class Dither {
 public:
-    Dither(Caches& caches);
+    explicit Dither(Caches& caches);
 
     void clear();
     void setupProgram(Program& program, GLuint* textureUnit);
diff --git a/libs/hwui/FrameInfo.h b/libs/hwui/FrameInfo.h
index 0baca39..afab84c 100644
--- a/libs/hwui/FrameInfo.h
+++ b/libs/hwui/FrameInfo.h
@@ -65,7 +65,7 @@
 
 class ANDROID_API UiFrameInfoBuilder {
 public:
-    UiFrameInfoBuilder(int64_t* buffer) : mBuffer(buffer) {
+    explicit UiFrameInfoBuilder(int64_t* buffer) : mBuffer(buffer) {
         memset(mBuffer, 0, UI_THREAD_FRAME_INFO_SIZE * sizeof(int64_t));
     }
 
diff --git a/libs/hwui/FrameInfoVisualizer.h b/libs/hwui/FrameInfoVisualizer.h
index 83adf19..719d0f8 100644
--- a/libs/hwui/FrameInfoVisualizer.h
+++ b/libs/hwui/FrameInfoVisualizer.h
@@ -45,7 +45,7 @@
 
 class FrameInfoVisualizer {
 public:
-    FrameInfoVisualizer(FrameInfoSource& source);
+    explicit FrameInfoVisualizer(FrameInfoSource& source);
     ~FrameInfoVisualizer();
 
     bool consumeProperties();
diff --git a/libs/hwui/GradientCache.h b/libs/hwui/GradientCache.h
index dccd450..49be19a 100644
--- a/libs/hwui/GradientCache.h
+++ b/libs/hwui/GradientCache.h
@@ -103,7 +103,7 @@
  */
 class GradientCache: public OnEntryRemoved<GradientCacheEntry, Texture*> {
 public:
-    GradientCache(Extensions& extensions);
+    explicit GradientCache(Extensions& extensions);
     ~GradientCache();
 
     /**
diff --git a/libs/hwui/JankTracker.h b/libs/hwui/JankTracker.h
index 84b8c3f..a23dd78 100644
--- a/libs/hwui/JankTracker.h
+++ b/libs/hwui/JankTracker.h
@@ -56,7 +56,7 @@
 // TODO: Replace DrawProfiler with this
 class JankTracker {
 public:
-    JankTracker(nsecs_t frameIntervalNanos);
+    explicit JankTracker(nsecs_t frameIntervalNanos);
     ~JankTracker();
 
     void addFrame(const FrameInfo& frame);
diff --git a/libs/hwui/LayerCache.h b/libs/hwui/LayerCache.h
index 6fe7b3a..7a1a9ae 100644
--- a/libs/hwui/LayerCache.h
+++ b/libs/hwui/LayerCache.h
@@ -105,7 +105,7 @@
             mHeight = Layer::computeIdealHeight(layerHeight);
         }
 
-        LayerEntry(Layer* layer):
+        explicit LayerEntry(Layer* layer):
             mLayer(layer), mWidth(layer->getWidth()), mHeight(layer->getHeight()) {
         }
 
diff --git a/libs/hwui/Matrix.h b/libs/hwui/Matrix.h
index 9cde5d6..ba9cbbe 100644
--- a/libs/hwui/Matrix.h
+++ b/libs/hwui/Matrix.h
@@ -81,11 +81,11 @@
         loadIdentity();
     }
 
-    Matrix4(const float* v) {
+    explicit Matrix4(const float* v) {
         load(v);
     }
 
-    Matrix4(const SkMatrix& v) {
+    Matrix4(const SkMatrix& v) {  // NOLINT, implicit
         load(v);
     }
 
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
old mode 100755
new mode 100644
index dacd8cc..ec450bd6
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -116,7 +116,7 @@
  */
 class OpenGLRenderer : public CanvasStateClient {
 public:
-    OpenGLRenderer(RenderState& renderState);
+    explicit OpenGLRenderer(RenderState& renderState);
     virtual ~OpenGLRenderer();
 
     void initProperties();
diff --git a/libs/hwui/PatchCache.h b/libs/hwui/PatchCache.h
index 66ef6a0..bc5981d 100644
--- a/libs/hwui/PatchCache.h
+++ b/libs/hwui/PatchCache.h
@@ -51,7 +51,7 @@
 
 class PatchCache {
 public:
-    PatchCache(RenderState& renderState);
+    explicit PatchCache(RenderState& renderState);
     ~PatchCache();
     void init();
 
diff --git a/libs/hwui/PathCache.h b/libs/hwui/PathCache.h
index 6368ddd..e1fcc31 100644
--- a/libs/hwui/PathCache.h
+++ b/libs/hwui/PathCache.h
@@ -288,7 +288,7 @@
 
     class PathProcessor: public TaskProcessor<SkBitmap*> {
     public:
-        PathProcessor(Caches& caches);
+        explicit PathProcessor(Caches& caches);
         ~PathProcessor() { }
 
         virtual void onProcess(const sp<Task<SkBitmap*> >& task) override;
diff --git a/libs/hwui/ProgramCache.h b/libs/hwui/ProgramCache.h
index 1dadda1..9ac885b 100644
--- a/libs/hwui/ProgramCache.h
+++ b/libs/hwui/ProgramCache.h
@@ -40,7 +40,7 @@
  */
 class ProgramCache {
 public:
-    ProgramCache(Extensions& extensions);
+    explicit ProgramCache(Extensions& extensions);
     ~ProgramCache();
 
     Program* get(const ProgramDescription& description);
diff --git a/libs/hwui/Rect.h b/libs/hwui/Rect.h
index de4fa55..dbd188f 100644
--- a/libs/hwui/Rect.h
+++ b/libs/hwui/Rect.h
@@ -73,7 +73,7 @@
             bottom(height) {
     }
 
-    inline Rect(const SkRect& rect):
+    inline Rect(const SkRect& rect):  // NOLINT, implicit
             left(rect.fLeft),
             top(rect.fTop),
             right(rect.fRight),
diff --git a/libs/hwui/RenderBufferCache.h b/libs/hwui/RenderBufferCache.h
index f77f4c9..6444331 100644
--- a/libs/hwui/RenderBufferCache.h
+++ b/libs/hwui/RenderBufferCache.h
@@ -82,7 +82,7 @@
             mBuffer(nullptr), mFormat(format), mWidth(width), mHeight(height) {
         }
 
-        RenderBufferEntry(RenderBuffer* buffer):
+        explicit RenderBufferEntry(RenderBuffer* buffer):
             mBuffer(buffer), mFormat(buffer->getFormat()),
             mWidth(buffer->getWidth()), mHeight(buffer->getHeight()) {
         }
diff --git a/libs/hwui/ResourceCache.h b/libs/hwui/ResourceCache.h
index 4583c8d..3ac7864 100644
--- a/libs/hwui/ResourceCache.h
+++ b/libs/hwui/ResourceCache.h
@@ -42,7 +42,7 @@
 class ResourceReference {
 public:
 
-    ResourceReference(ResourceType type) {
+    explicit ResourceReference(ResourceType type) {
         refCount = 0; destroyed = false; resourceType = type;
     }
 
diff --git a/libs/hwui/SkiaCanvasProxy.h b/libs/hwui/SkiaCanvasProxy.h
index 973c55f..c03c523 100644
--- a/libs/hwui/SkiaCanvasProxy.h
+++ b/libs/hwui/SkiaCanvasProxy.h
@@ -39,7 +39,7 @@
  */
 class ANDROID_API SkiaCanvasProxy : public SkCanvas {
 public:
-    SkiaCanvasProxy(Canvas* canvas, bool filterHwuiCalls = false);
+    explicit SkiaCanvasProxy(Canvas* canvas, bool filterHwuiCalls = false);
     virtual ~SkiaCanvasProxy() {}
 
 protected:
diff --git a/libs/hwui/TextDropShadowCache.h b/libs/hwui/TextDropShadowCache.h
index d536c40..13e8774 100644
--- a/libs/hwui/TextDropShadowCache.h
+++ b/libs/hwui/TextDropShadowCache.h
@@ -111,7 +111,7 @@
  * Alpha texture used to represent a shadow.
  */
 struct ShadowTexture: public Texture {
-    ShadowTexture(Caches& caches): Texture(caches) {
+    explicit ShadowTexture(Caches& caches): Texture(caches) {
     }
 
     float left;
@@ -121,7 +121,7 @@
 class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
 public:
     TextDropShadowCache();
-    TextDropShadowCache(uint32_t maxByteSize);
+    explicit TextDropShadowCache(uint32_t maxByteSize);
     ~TextDropShadowCache();
 
     /**
diff --git a/libs/hwui/Texture.h b/libs/hwui/Texture.h
index 9749f73..b72742f 100644
--- a/libs/hwui/Texture.h
+++ b/libs/hwui/Texture.h
@@ -34,7 +34,7 @@
  */
 class Texture : public GpuMemoryTracker {
 public:
-    Texture(Caches& caches)
+    explicit Texture(Caches& caches)
         : GpuMemoryTracker(GpuObjectType::Texture)
         , mCaches(caches)
     { }
@@ -171,7 +171,7 @@
 
 class AutoTexture {
 public:
-    AutoTexture(Texture* texture)
+    explicit AutoTexture(Texture* texture)
             : texture(texture) {}
     ~AutoTexture() {
         if (texture && texture->cleanup) {
diff --git a/libs/hwui/renderthread/RenderTask.h b/libs/hwui/renderthread/RenderTask.h
index 89c3a7d..9ea671b 100644
--- a/libs/hwui/renderthread/RenderTask.h
+++ b/libs/hwui/renderthread/RenderTask.h
@@ -73,7 +73,7 @@
 
 class MethodInvokeRenderTask : public RenderTask {
 public:
-    MethodInvokeRenderTask(RunnableMethod method)
+    explicit MethodInvokeRenderTask(RunnableMethod method)
         : mMethod(method), mReturnPtr(nullptr) {}
 
     void* payload() { return mData; }
diff --git a/libs/hwui/thread/Barrier.h b/libs/hwui/thread/Barrier.h
index 0a7acb0..17f82ba9 100644
--- a/libs/hwui/thread/Barrier.h
+++ b/libs/hwui/thread/Barrier.h
@@ -24,7 +24,7 @@
 
 class Barrier {
 public:
-    Barrier(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mOpened(false) { }
+    explicit Barrier(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mOpened(false) { }
     ~Barrier() { }
 
     void open() {
diff --git a/libs/hwui/thread/Future.h b/libs/hwui/thread/Future.h
index a3ff3bc..177eebd 100644
--- a/libs/hwui/thread/Future.h
+++ b/libs/hwui/thread/Future.h
@@ -27,7 +27,7 @@
 template<typename T>
 class Future: public LightRefBase<Future<T> > {
 public:
-    Future(Condition::WakeUpType type = Condition::WAKE_UP_ONE): mBarrier(type), mResult() { }
+    explicit Future(Condition::WakeUpType type = Condition::WAKE_UP_ONE): mBarrier(type), mResult() { }
     ~Future() { }
 
     /**
diff --git a/libs/hwui/thread/Signal.h b/libs/hwui/thread/Signal.h
index d4cfeeb..93e6f4c 100644
--- a/libs/hwui/thread/Signal.h
+++ b/libs/hwui/thread/Signal.h
@@ -26,7 +26,7 @@
 
 class Signal {
 public:
-    Signal(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mSignaled(false) { }
+    explicit Signal(Condition::WakeUpType type = Condition::WAKE_UP_ALL) : mType(type), mSignaled(false) { }
     ~Signal() { }
 
     void signal() {
diff --git a/libs/hwui/thread/TaskManager.h b/libs/hwui/thread/TaskManager.h
index e4808f7..0e4ffdc 100644
--- a/libs/hwui/thread/TaskManager.h
+++ b/libs/hwui/thread/TaskManager.h
@@ -78,7 +78,7 @@
 
     class WorkerThread: public Thread {
     public:
-        WorkerThread(const String8 name): mSignal(Condition::WAKE_UP_ONE), mName(name) { }
+        explicit WorkerThread(const String8 name): mSignal(Condition::WAKE_UP_ONE), mName(name) { }
 
         bool addTask(const TaskWrapper& task);
         size_t getTaskCount() const;
diff --git a/libs/hwui/thread/TaskProcessor.h b/libs/hwui/thread/TaskProcessor.h
index 82538e9..5867450 100644
--- a/libs/hwui/thread/TaskProcessor.h
+++ b/libs/hwui/thread/TaskProcessor.h
@@ -36,7 +36,7 @@
 template<typename T>
 class TaskProcessor: public TaskProcessorBase {
 public:
-    TaskProcessor(TaskManager* manager): mManager(manager) { }
+    explicit TaskProcessor(TaskManager* manager): mManager(manager) { }
     virtual ~TaskProcessor() { }
 
     void add(const sp<Task<T> >& task) {