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...
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  • 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...
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  • 3.4. Android Studio installation

    3.4.1. Step 1-system requirements ¶ You can start Android application development in the following operating syste...
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  • 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...
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  • 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...
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  • 3.7. Android application components

    Application components are the basic building blocks of an Android application. These components are organized by loosely co...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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Principles, Technologies, and Methods of Geographic Information Systems

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In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.