3. Android

  • 3.1. Android tutorial

    Android is an open source, Linux-based mobile device operating system, mainly used in mobile devices, such as smartphones...
    2025-10-25 13:33:23 UTC
  • 3.2. Overview of Android

    3.2.1. What is Android? ¶ Android is an open source, Linux-based operating system for mobile devices such as smart...
    2025-10-25 13:33:22 UTC
  • 3.3. Construction of Android development environment

    First, you can start Android application development on the following operating systems: Microsoft Windows XP or late...
    2025-10-25 13:33:22 UTC
  • 3.4. Android Studio installation

    3.4.1. Step 1-system requirements ¶ You can start Android application development in the following operating syste...
    2025-10-25 13:33:24 UTC
  • 3.5. Construction of Android Eclipse integrated environment

    3.5.1. Install Android SDK ¶ You can read from the official website Android SDK 下载 Download the latest version of A...
    2025-10-25 13:33:23 UTC
  • 3.6. Android architecture

    The Android operating system is a stack of software components, which can be roughly divided into five parts and four main l...
    2025-10-25 13:33:23 UTC
  • 3.7. Android application components

    Application components are the basic building blocks of an Android application. These components are organized by loosely co...
    2025-10-25 13:33:23 UTC
  • 3.8. Android Hello World instance

    Let’s start with real programming based on the Android framework. Before you start writing the first example using Android S...
    2025-10-25 13:33:22 UTC
  • 3.9. Android Resource (Resources) access

    There are many things to build a good Android application. In addition to application coding, you need to focus on a variety...
    2025-10-25 13:33:23 UTC
  • 3.10. Android activity (Activity)

    The activity represents a single screen with a user interface, such as a Java window or frame. Android’s activities are Co...
    2025-10-25 13:33:24 UTC
  • 3.11. Android Service (Service)

    A service is a component that runs in the background and performs long-running tasks that do not require user interaction. E...
    2025-10-25 13:33:23 UTC
  • 3.12. Android broadcast receiver (Broadcast Receivers)

    Broadcast receivers are used to respond to broadcast messages from other applications or systems. These messages are sometim...
    2025-10-25 13:33:24 UTC
  • 3.13. Android-content provider (Content Provider)

    内容提供者组件通过请求从一个应用程序向其他的应用程序提供数据。这些请求由类 ContentResolver 的方法来处理。内容提供者可以使用不同的方式来存储数据。 数据可以被存放在数据库,文件,甚至是网络。 Sometimes y...
    2025-10-25 13:33:24 UTC
  • 3.14. Android fragments (Fragment)

    Fragments are part of the activity, which makes the activity more modular. We can think of debris as a seed activity. Here...
    2025-10-25 13:33:23 UTC
  • 3.15. Android single frame fragment

    单帧碎片:单帧碎片是为小屏幕设备所设计的,如手持设备(移动电话),Android 3.0 以上版本支持。 3.15.1. Example ¶ This example explains how to create your own...
    2025-10-25 13:33:23 UTC
  • 3.16. Android list fragment

    The basic implementation of list fragmentation is to create a project list in the fragment 3.16.1. Example ¶ T...
    2025-10-25 13:33:22 UTC
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。