[sensors] Android platform adaptation for Generic Sensor API

device/generic_sensor/platform_sensor_android.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "device/generic_sensor/platform_sensor_android.h"
+
+#include "base/android/context_utils.h"
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "jni/PlatformSensor_jni.h"
+
+using base::android::AttachCurrentThread;
+using base::android::JavaRef;
+
+namespace device {
+
+// static
+bool PlatformSensorAndroid::RegisterJNI(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+PlatformSensorAndroid::PlatformSensorAndroid(
+    mojom::SensorType type,
+    mojo::ScopedSharedBufferMapping mapping,
+    uint64_t buffer_size,
+    PlatformSensorProvider* provider,
+    const JavaRef<jobject>& java_sensor)
+    : PlatformSensor(type, std::move(mapping), provider),
+      task_runner_(base::MessageLoop::current()->task_runner()) {
+  JNIEnv* env = AttachCurrentThread();
+  j_object_.Reset(java_sensor);
+
+  jobject byte_buffer =
+      env->NewDirectByteBuffer(shared_buffer_mapping_.get(), buffer_size);
+  Java_PlatformSensor_initPlatformSensorAndroid(
+      env, j_object_.obj(), reinterpret_cast<jlong>(this), byte_buffer);
+}
+
+PlatformSensorAndroid::~PlatformSensorAndroid() {
+  StopSensor();
+}
+
+mojom::ReportingMode PlatformSensorAndroid::GetReportingMode() {
+  JNIEnv* env = AttachCurrentThread();
+  return static_cast<mojom::ReportingMode>(
+      Java_PlatformSensor_getReportingMode(env, j_object_.obj()));
+}
+
+PlatformSensorConfiguration PlatformSensorAndroid::GetDefaultConfiguration() {
+  JNIEnv* env = AttachCurrentThread();
+  jdouble frequency =
+      Java_PlatformSensor_getDefaultConfiguration(env, j_object_.obj());
+  return PlatformSensorConfiguration(frequency);
+}
+
+bool PlatformSensorAndroid::StartSensor(
+    const PlatformSensorConfiguration& configuration) {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_PlatformSensor_startSensor(env, j_object_.obj(),
+                                         configuration.frequency());
+}
+
+void PlatformSensorAndroid::StopSensor() {
+  JNIEnv* env = AttachCurrentThread();
+  Java_PlatformSensor_stopSensor(env, j_object_.obj());
+}
+
+bool PlatformSensorAndroid::CheckSensorConfiguration(
+    const PlatformSensorConfiguration& configuration) {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_PlatformSensor_checkSensorConfiguration(
+      env, j_object_.obj(), configuration.frequency());
+}
+
+void PlatformSensorAndroid::NotifyPlatformSensorReadingChanged(
+    JNIEnv*,
+    const JavaRef<jobject>& caller) {
+  task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&PlatformSensorAndroid::NotifySensorReadingChanged, this));
+}
+
+void PlatformSensorAndroid::NotifyPlatformSensorError(
+    JNIEnv*,
+    const JavaRef<jobject>& caller) {
+  task_runner_->PostTask(
+      FROM_HERE, base::Bind(&PlatformSensorAndroid::NotifySensorError, this));
+}
+
+}  // namespace device