What is the implementation principle of Android message push?
The implementation principle of Android push notifications mainly involves the following steps: 1. Device registration: When the application is launched for the first time, it will register the device with the push service provider to obtain a unique identifier associated with the device (such as a device token). 2. Server sends messages: When the server has new messages to push to the device, it will send the messages through the push service provider to the device identifier corresponding to the device. 3. Device receives messages: When the device is running in the background, it will listen for messages sent by the push service provider. When the device receives a push message, it will pass the message to the system notification bar or the application (based on the processing method of the push message). 4. Display notifications: After the device receives the push message, it will display the message in the system notification bar or the application. Users can open the application or perform other operations by clicking on the notification. It should be noted that push service providers use two main message delivery mechanisms: long connections and polling. A long connection refers to the establishment of a persistent connection between the device and the push service for real-time message delivery. Polling involves the device sending requests to the push service at intervals to check for new messages. The specific mechanism used depends on the needs of the push service provider and the application. In addition, in order to save device power and network traffic, the Android system also provides Doze mode and application standby mode. In Doze mode, the device limits the network access and background tasks of applications to reduce the frequency of message push. In application standby mode, the device suspends the operation of the application until it is awakened. Therefore, developers need to consider the impact of these modes on message push to ensure the timeliness and reliability of messages.
