Android broadcast, service, database, notifications, package principles and descriptions

Brief introduction

There are many mechanisms used in Android, such as: Broadcast, service, database, notification, package ... Wait a minute.
What is a broadcast? Broadcast is a widely used mechanism for transmitting information between applications. Like a radio station that receives a transmission based on a particular frequency.
What is a service? Service is one of the four components of the Android system, which is the same as the activity level, but cannot run on its own only in the background and can interact with other components. Use occasions such as: background music player.
What database was used? Using the Open source project SQLite operation data in Android. The SQLite database is an open-source embedded database D.richard Hipp in C, with a supported database size of 2TB.
What notice? Notification is a commonly used in Android notification method, when there are unread text messages or missed calls, the screen status bar will have a hint icon, you can pull down the status bar to read the notification.
What is a package? The Android app has a package that describes the program.

Details 1, broadcast Broadcastreceiver

2. Service Services

Life cycle

3. Database ContentProvider

4. Notification Bar Notification

5, Package Packages

The management class for packages in Android is Packagemanager.

The framework is as follows:

Android broadcast, service, database, notifications, package principles and descriptions