Getting Started with Android

1. What is activity

Activity is an interface that is primarily responsible for interacting with users and is an application façade.

2. Service (services)

The service is a worker on Android and takes care of most of the data (think about the sand monk)

3. Content Provider (provider of contents)

The data sharing method, equivalent to the National Archives of the Android Kingdom, is responsible for providing data externally and allowing the required applications to access the data. (Data sharing component)

4. Broadcastreceiver (broadcast receiver)

Monitor everything that happens on your phone. such as: The phone is dimmed.

The broadcast is systematic and the personnel cannot hear it.

Can be used to alert users.

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Activity starts the basic process

1, Androidmanifest.xml is the main configuration file

Relative layout

TextView layout

Getting Started with Android