diff --git a/ndk/platforms/android-17/samples/Teapot/AndroidManifest.xml b/ndk/platforms/android-17/samples/Teapot/AndroidManifest.xml
index 510e97ab6..1f1ef97bc 100644
--- a/ndk/platforms/android-17/samples/Teapot/AndroidManifest.xml
+++ b/ndk/platforms/android-17/samples/Teapot/AndroidManifest.xml
@@ -5,7 +5,7 @@
 
     <uses-sdk
         android:minSdkVersion="11"
-        android:targetSdkVersion="17" />
+        android:targetSdkVersion="19" />
     <uses-feature android:glEsVersion="0x00020000"></uses-feature>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
     <application
diff --git a/ndk/platforms/android-17/samples/Teapot/jni/Android.mk b/ndk/platforms/android-17/samples/Teapot/jni/Android.mk
index 583743f97..c35ab3711 100644
--- a/ndk/platforms/android-17/samples/Teapot/jni/Android.mk
+++ b/ndk/platforms/android-17/samples/Teapot/jni/Android.mk
@@ -13,6 +13,14 @@ LOCAL_CFLAGS :=
 LOCAL_LDLIBS    := -llog -landroid -lEGL -lGLESv2
 LOCAL_STATIC_LIBRARIES := cpufeatures android_native_app_glue ndk_helper
 
+ifneq ($(filter %armeabi-v7a,$(TARGET_ARCH_ABI)),)
+LOCAL_CFLAGS += -mhard-float -D_NDK_MATH_NO_SOFTFP=1
+LOCAL_LDLIBS += -lm_hard
+ifeq (,$(filter -fuse-ld=mcld,$(APP_LDFLAGS) $(LOCAL_LDFLAGS)))
+LOCAL_LDFLAGS += -Wl,--no-warn-mismatch
+endif
+endif
+
 include $(BUILD_SHARED_LIBRARY)
 
 $(call import-module,android/ndk_helper)
diff --git a/ndk/platforms/android-17/samples/Teapot/jni/Application.mk b/ndk/platforms/android-17/samples/Teapot/jni/Application.mk
index 39b678dc1..93671580d 100644
--- a/ndk/platforms/android-17/samples/Teapot/jni/Application.mk
+++ b/ndk/platforms/android-17/samples/Teapot/jni/Application.mk
@@ -1,4 +1,4 @@
 APP_PLATFORM := android-9
 APP_ABI := all
 
-APP_STL := stlport_static
\ No newline at end of file
+APP_STL := stlport_static
diff --git a/ndk/platforms/android-17/samples/Teapot/project.properties b/ndk/platforms/android-17/samples/Teapot/project.properties
index 0c9830a3b..d5ad9f85d 100644
--- a/ndk/platforms/android-17/samples/Teapot/project.properties
+++ b/ndk/platforms/android-17/samples/Teapot/project.properties
@@ -11,4 +11,4 @@
 #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
 
 # Project target.
-target=Google Inc.:Google APIs:17
+target=Google Inc.:Google APIs:19
diff --git a/ndk/platforms/android-17/samples/Teapot/src/com/sample/teapot/TeapotNativeActivity.java b/ndk/platforms/android-17/samples/Teapot/src/com/sample/teapot/TeapotNativeActivity.java
index f6a2e339a..32696b8ff 100644
--- a/ndk/platforms/android-17/samples/Teapot/src/com/sample/teapot/TeapotNativeActivity.java
+++ b/ndk/platforms/android-17/samples/Teapot/src/com/sample/teapot/TeapotNativeActivity.java
@@ -42,10 +42,16 @@ public class TeapotNativeActivity extends NativeActivity {
         {
             getWindow().getDecorView().setSystemUiVisibility(View.STATUS_BAR_HIDDEN);
         }
-        else if(SDK_INT >= 14)
+        else if(SDK_INT >= 14 && SDK_INT < 19)
         {
             getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LOW_PROFILE);
         }
+        else if(SDK_INT >= 19)
+        {
+            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN
+                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        }
 
     }
     // Our popup window, you will call it from your C/C++ code later
diff --git a/ndk/platforms/android-18/samples/MoreTeapots/AndroidManifest.xml b/ndk/platforms/android-18/samples/MoreTeapots/AndroidManifest.xml
index ae0bc3d63..6bef3560c 100644
--- a/ndk/platforms/android-18/samples/MoreTeapots/AndroidManifest.xml
+++ b/ndk/platforms/android-18/samples/MoreTeapots/AndroidManifest.xml
@@ -5,7 +5,7 @@
 
     <uses-sdk
         android:minSdkVersion="11"
-        android:targetSdkVersion="17" />
+        android:targetSdkVersion="19" />
     <uses-feature android:glEsVersion="0x00020000"></uses-feature>
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
     <application
diff --git a/ndk/platforms/android-18/samples/MoreTeapots/jni/Android.mk b/ndk/platforms/android-18/samples/MoreTeapots/jni/Android.mk
index cb0faf7c8..b4457b9a9 100644
--- a/ndk/platforms/android-18/samples/MoreTeapots/jni/Android.mk
+++ b/ndk/platforms/android-18/samples/MoreTeapots/jni/Android.mk
@@ -12,6 +12,14 @@ LOCAL_CFLAGS :=
 LOCAL_LDLIBS    := -llog -landroid -lEGL -lGLESv2
 LOCAL_STATIC_LIBRARIES := cpufeatures android_native_app_glue ndk_helper
 
+ifneq ($(filter %armeabi-v7a,$(TARGET_ARCH_ABI)),)
+LOCAL_CFLAGS += -mhard-float -D_NDK_MATH_NO_SOFTFP=1
+LOCAL_LDLIBS += -lm_hard
+ifeq (,$(filter -fuse-ld=mcld,$(APP_LDFLAGS) $(LOCAL_LDFLAGS)))
+LOCAL_LDFLAGS += -Wl,--no-warn-mismatch
+endif
+endif
+
 include $(BUILD_SHARED_LIBRARY)
 
 $(call import-module,android/ndk_helper)
diff --git a/ndk/platforms/android-18/samples/MoreTeapots/jni/Application.mk b/ndk/platforms/android-18/samples/MoreTeapots/jni/Application.mk
index 39b678dc1..93671580d 100644
--- a/ndk/platforms/android-18/samples/MoreTeapots/jni/Application.mk
+++ b/ndk/platforms/android-18/samples/MoreTeapots/jni/Application.mk
@@ -1,4 +1,4 @@
 APP_PLATFORM := android-9
 APP_ABI := all
 
-APP_STL := stlport_static
\ No newline at end of file
+APP_STL := stlport_static
diff --git a/ndk/platforms/android-18/samples/MoreTeapots/jni/MoreTeapotsNativeActivity.cpp b/ndk/platforms/android-18/samples/MoreTeapots/jni/MoreTeapotsNativeActivity.cpp
index d5f215adb..43b7361e4 100644
--- a/ndk/platforms/android-18/samples/MoreTeapots/jni/MoreTeapotsNativeActivity.cpp
+++ b/ndk/platforms/android-18/samples/MoreTeapots/jni/MoreTeapotsNativeActivity.cpp
@@ -41,7 +41,7 @@
 //-------------------------------------------------------------------------
 const int32_t NUM_TEAPOTS_X = 8;
 const int32_t NUM_TEAPOTS_Y = 8;
-const int32_t NUM_TEAPOTS_Z = 6;
+const int32_t NUM_TEAPOTS_Z = 8;
 
 //-------------------------------------------------------------------------
 //Shared state for our app.
diff --git a/ndk/platforms/android-18/samples/MoreTeapots/project.properties b/ndk/platforms/android-18/samples/MoreTeapots/project.properties
index 0c9830a3b..d5ad9f85d 100644
--- a/ndk/platforms/android-18/samples/MoreTeapots/project.properties
+++ b/ndk/platforms/android-18/samples/MoreTeapots/project.properties
@@ -11,4 +11,4 @@
 #proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
 
 # Project target.
-target=Google Inc.:Google APIs:17
+target=Google Inc.:Google APIs:19
diff --git a/ndk/platforms/android-18/samples/MoreTeapots/src/com/sample/moreteapots/MoreTeapotsNativeActivity.java b/ndk/platforms/android-18/samples/MoreTeapots/src/com/sample/moreteapots/MoreTeapotsNativeActivity.java
index 7f8248a5c..ed5b1d309 100644
--- a/ndk/platforms/android-18/samples/MoreTeapots/src/com/sample/moreteapots/MoreTeapotsNativeActivity.java
+++ b/ndk/platforms/android-18/samples/MoreTeapots/src/com/sample/moreteapots/MoreTeapotsNativeActivity.java
@@ -38,12 +38,20 @@ public class MoreTeapotsNativeActivity extends NativeActivity {
 
         //Hide toolbar
         int SDK_INT = android.os.Build.VERSION.SDK_INT;
-        if(SDK_INT >= 11 && SDK_INT < 14) {
+        if(SDK_INT >= 11 && SDK_INT < 14)
+        {
             getWindow().getDecorView().setSystemUiVisibility(View.STATUS_BAR_HIDDEN);
-        }else if(SDK_INT >= 14){
+        }
+        else if(SDK_INT >= 14 && SDK_INT < 19)
+        {
             getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_LOW_PROFILE);
         }
-
+        else if(SDK_INT >= 19)
+        {
+            getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN
+                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        }
     }
 
     protected void onPause()
diff --git a/ndk/sources/android/ndk_helper/Android.mk b/ndk/sources/android/ndk_helper/Android.mk
index e7134da3b..98dc1bea8 100644
--- a/ndk/sources/android/ndk_helper/Android.mk
+++ b/ndk/sources/android/ndk_helper/Android.mk
@@ -10,6 +10,16 @@ LOCAL_EXPORT_LDLIBS    := -llog -landroid -lEGL -lGLESv2
 
 LOCAL_STATIC_LIBRARIES := cpufeatures android_native_app_glue
 
+
+ifneq ($(filter %armeabi-v7a,$(TARGET_ARCH_ABI)),)
+LOCAL_CFLAGS += -mhard-float -D_NDK_MATH_NO_SOFTFP=1
+LOCAL_EXPORT_CFLAGS += -mhard-float -D_NDK_MATH_NO_SOFTFP=1
+LOCAL_EXPORT_LDLIBS += -lm_hard
+ifeq (,$(filter -fuse-ld=mcld,$(APP_LDFLAGS) $(LOCAL_LDFLAGS)))
+LOCAL_EXPORT_LDFLAGS += -Wl,--no-warn-mismatch
+endif
+endif
+
 include $(BUILD_STATIC_LIBRARY)
 
 #$(call import-module,android/native_app_glue)
diff --git a/ndk/sources/android/ndk_helper/JNIHelper.cpp b/ndk/sources/android/ndk_helper/JNIHelper.cpp
index e06520a4f..e1e7f00ce 100644
--- a/ndk/sources/android/ndk_helper/JNIHelper.cpp
+++ b/ndk/sources/android/ndk_helper/JNIHelper.cpp
@@ -131,8 +131,8 @@ bool JNIHelper::ReadFile( const char* fileName,
     s.append( fileName );
     std::ifstream f( s.c_str(), std::ios::binary );
 
-    env->DeleteLocalRef( str_path );
     env->ReleaseStringUTFChars( str_path, path );
+    env->DeleteLocalRef( str_path );
     activity_->vm->DetachCurrentThread();
 
     if( f )
@@ -197,8 +197,8 @@ std::string JNIHelper::GetExternalFilesDir()
     const char* path = env->GetStringUTFChars( strPath, NULL );
     std::string s( path );
 
-    env->DeleteLocalRef( strPath );
     env->ReleaseStringUTFChars( strPath, path );
+    env->DeleteLocalRef( strPath );
     activity_->vm->DetachCurrentThread();
 
     pthread_mutex_unlock( &mutex_ );
@@ -277,9 +277,9 @@ std::string JNIHelper::ConvertString( const char* str,
 
     std::string s = std::string( cparam );
 
+    env->ReleaseStringUTFChars( object, cparam );
     env->DeleteLocalRef( strEncode );
     env->DeleteLocalRef( object );
-    env->ReleaseStringUTFChars( object, cparam );
     activity_->vm->DetachCurrentThread();
     pthread_mutex_unlock( &mutex_ );