| // 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/macros.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. |
| // |
| // Note that these states represent the most visible Activity state. |
| // If there are activities with states paused and stopped, only |
| // HAS_PAUSED_ACTIVITIES should be returned. |
| // |
| // A Java counterpart will be generated for this enum. |
| // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.base |
| enum ApplicationState { |
| APPLICATION_STATE_UNKNOWN = 0, |
| APPLICATION_STATE_HAS_RUNNING_ACTIVITIES = 1, |
| APPLICATION_STATE_HAS_PAUSED_ACTIVITIES = 2, |
| APPLICATION_STATE_HAS_STOPPED_ACTIVITIES = 3, |
| APPLICATION_STATE_HAS_DESTROYED_ACTIVITIES = 4 |
| }; |
| |
| // 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); |
| |
| // Expose jni call for ApplicationStatus.getStateForApplication. |
| static ApplicationState GetState(); |
| |
| private: |
| void Notify(ApplicationState state); |
| |
| ApplicationStateChangeCallback callback_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ApplicationStatusListener); |
| }; |
| |
| } // namespace android |
| } // namespace base |
| |
| #endif // BASE_ANDROID_APPLICATION_STATUS_LISTENER_H_ |