Android Component Communication (chapter summary)

1, jumps between different activity can be completed using intent, and the user can also receive the results returned by the activity via the Onactivityresult () method.


2, in the Android operating system, provides a number of operational intent, the user only need to set the action to jump and a number of additional data can be implemented by these program calls.


The life cycle of the 3,activity consists of the operating state (Running state), the suspended states (Pauserd), and the Stop states (Stopped State).


4, using Activitygroup is easier than using the Tabhost component to manage label operations.


5, in Android, the data of the child thread cannot update the UI components in the main thread, and the user can complete the communication between the main thread and the child thread through handler and Looper.


The operation of the 6,asynctask class can reduce the operational complexity between the main thread and the child threads.


7,service is a UI-free component that runs in the background of a mobile phone system, providing a variety of service for users in the Android system.


The main function of 8,pendingintent is to wrap a intent that will be executed, wait for a specific situation to be satisfied before executing the intent.


9, the broadcast mechanism can listen to the user's actions, and after the user action if processing.


The 10,appwidget component enables interoperability between desktop programs and activity.