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// Copyright 2014 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.
#ifndef BASE_ANDROID_APPLICATION_STATUS_LISTENER_H_
#define BASE_ANDROID_APPLICATION_STATUS_LISTENER_H_
#include <jni.h>
#include "base/android/jni_android.h"
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/singleton.h"
#include "base/observer_list_threadsafe.h"
namespace base {
namespace android {
// Define application state values like APPLICATION_STATE_VISIBLE in a
// way that ensures they're always the same than their Java counterpart.
enum ApplicationState {
#define DEFINE_APPLICATION_STATE(x, y) APPLICATION_STATE_##x = y,
#include "base/android/application_state_list.h"
#undef DEFINE_APPLICATION_STATE
};
// A native helper class to listen to state changes of the Android
// Application. This mirrors org.chromium.base.ApplicationStatus.
// any thread.
//
// To start listening, create a new instance, passing a callback to a
// function that takes an ApplicationState parameter. To stop listening,
// simply delete the listener object. The implementation guarantees
// that the callback will always be called on the thread that created
// the listener.
//
// Example:
//
// void OnApplicationStateChange(ApplicationState state) {
// ...
// }
//
// // Start listening.
// ApplicationStatusListener* my_listener =
// new ApplicationStatusListener(
// base::Bind(&OnApplicationStateChange));
//
// ...
//
// // Stop listening.
// delete my_listener
//
class BASE_EXPORT ApplicationStatusListener {
public:
typedef base::Callback<void(ApplicationState)> ApplicationStateChangeCallback;
explicit ApplicationStatusListener(
const ApplicationStateChangeCallback& callback);
~ApplicationStatusListener();
// Internal use: must be public to be called from base_jni_registrar.cc
static bool RegisterBindings(JNIEnv* env);
// Internal use only: must be public to be called from JNI and unit tests.
static void NotifyApplicationStateChange(ApplicationState state);
private:
void Notify(ApplicationState state);
ApplicationStateChangeCallback callback_;
DISALLOW_COPY_AND_ASSIGN(ApplicationStatusListener);
};
} // namespace android
} // namespace base
#endif // BASE_ANDROID_APPLICATION_STATUS_LISTENER_H_
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