upload android base code part6

android/system/chre/apps/hello_world/Makefile

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+#
+# Hello World Nanoapp Makefile
+#
+
+# Environment Checks ###########################################################
+
+ifeq ($(CHRE_PREFIX),)
+ifneq ($(ANDROID_BUILD_TOP),)
+CHRE_PREFIX = $(ANDROID_BUILD_TOP)/system/chre
+else
+$(error "You must run 'lunch' to setup ANDROID_BUILD_TOP, or explicitly define \
+         the CHRE_PREFIX environment variable to point to the CHRE root \
+	 directory.")
+endif
+endif
+
+# Nanoapp Configuration ########################################################
+
+NANOAPP_NAME = hello_world
+NANOAPP_ID = 0x0123456789000001
+NANOAPP_VERSION = 0x00000001
+
+NANOAPP_NAME_STRING = \"Hello\ World\"
+
+# Common Compiler Flags ########################################################
+
+COMMON_CFLAGS += -I.
+
+# Common Source Files ##########################################################
+
+COMMON_SRCS += hello_world.cc
+
+# Makefile Includes ############################################################
+
+include $(CHRE_PREFIX)/build/nanoapp/app.mk

android/system/chre/apps/hello_world/hello_world.cc

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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <chre.h>
+#include <inttypes.h>
+
+/**
+ * @file
+ * A very basic example nanoapp that just logs activity in its entry points.
+ * Note that code wrapped in #ifdef CHRE_NANOAPP_INTERNAL is only relevant when
+ * a nanoapp is to be statically built into the CHRE system binary, which would
+ * make it a "system nanoapp" rather than a true dynamically loadable nanoapp.
+ */
+
+#ifdef CHRE_NANOAPP_INTERNAL
+namespace chre {
+namespace {
+#endif  // CHRE_NANOAPP_INTERNAL
+
+bool nanoappStart() {
+  chreLog(CHRE_LOG_INFO, "Hello, world from version 0x%08x", chreGetVersion());
+  return true;
+}
+
+void nanoappHandleEvent(uint32_t senderInstanceId,
+                        uint16_t eventType,
+                        const void * /*eventData*/) {
+  chreLog(CHRE_LOG_INFO, "Received event 0x%" PRIx16 " from 0x%" PRIx32 " at "
+          "time %" PRIu64, eventType, senderInstanceId, chreGetTime());
+}
+
+void nanoappEnd() {
+  chreLog(CHRE_LOG_INFO, "Goodbye, world!");
+}
+
+#ifdef CHRE_NANOAPP_INTERNAL
+}  // anonymous namespace
+}  // namespace chre
+
+#include "chre/util/nanoapp/app_id.h"
+#include "chre/platform/static_nanoapp_init.h"
+
+CHRE_STATIC_NANOAPP_INIT(HelloWorld, chre::kHelloWorldAppId, 0);
+#endif  // CHRE_NANOAPP_INTERNAL

android/system/chre/apps/hello_world/hello_world.mk

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+#
+# Hello World Makefile
+#
+
+# Common Compiler Flags ########################################################
+
+# Include paths.
+COMMON_CFLAGS += -Iapps/hello_world/include
+
+# Common Source Files ##########################################################
+
+COMMON_SRCS += apps/hello_world/hello_world.cc