Android组件_第4页-阿里云

Android JetPack组件之ViewModel的使用详解

前言： ViewModel的简单介绍介绍：ViewModel 类旨在以注重生命周期的方式存储和管理界面相关的数据。ViewModel 类让数据可在发生屏幕旋转，更换系统语言等配置更改后继续留存。接下来我们通过一个简单的例子，来了解和使用ViewModel一、首先引入ViewModel的相关依赖imp...

Android LifeCycles之让组件感知生命周期的使用(生命周期观察者)

1.首先我们拿计时器控件Chronometer来举例说明，先不使用生命周期观察者，而是在对应的生命周期方法中实现相应的功能首先创建xml文件<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="htt...

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Android 使用BottomNavigationView和Novigation组件实现底部导航功能

效果图如下：实现步骤：在工作之前添加所需的相关依赖,切记这个一定不要忘了implementation 'androidx.navigation:navigation-fragment:2.2.2' implementation 'androidx.navigation:navigation-ui:2...

Android 四大组件之ContentProvider 访问通讯录进行增删改查操作

首先在清单文件和java文件中添加读取通讯录的权限 <uses-permission android:name="android.permission.WRITE_CONTACTS"/> ...

Android 四大组件之Service的详解

一、Service的简介Service是Android中实现程序后台运行的解决方案，适用于去执行那些不需要和用户交互而且还要求长期运行的任务。Service是android 系统中的四大组件之一（Activity、Service、BroadcastReceiver、ContentProvider），...

Android 开发四大组件（Activity、Service、Broadcast Receiver、Content Provider）

活动 (Activity)Android 中，Activity 是所有程序的根本，所有程序的流程都运行在 Activity 之中，Activity 可以算是开发者遇到的最频繁，也是 Android 当中最基本的模块之一。一般一个 Android 应用是由多个 Activity 组成的。这多个 Ac...

Android 对话框组件 AlertDialog 四种常用方法

一、什么是AlertDialog对话框？在Android中，AlertDialog可以为当前的界面上显示一个对话框，而且产生的对话框是在所有界面元素上面的，能够覆盖掉其余组件，所以AlertDialog一般是用于提示一些非常重要的信息或者警告内容。二、如何使用？ AlertD...

Android上机实验-5 开发组件的使用

一、实验目的掌握Activity的创建与配置。掌握Activity之间数据传递与数据回传。二、实验内容实验题目 Activity之间实现数据传递及数据回传任务要求：模拟短信发送页面，联系人信息通过点击按钮打开新的页面（或系统联系人）获取，短信内容部分填写自己学号、...

Android上机实验-3 高级组件的使用

一、实验目的掌握ListView控件和Recyclerview的基本使用方式。掌握使用ArrayAdapter、SimpleAdapter、BaseAdapter实现填充数据。二、实验指导1、写UI界面 xml文件 ListView2、寻找ListView（初始化）3、实现L...

【Android开发日常】一文弄懂桌面图标快捷菜单 & 桌面小组件

本文将介绍如何创建和管理应用快捷方式、如何创建和管理应用桌面小组件。@TOC 一、桌面菜单 1.1 概览开发可以定义快捷方式，以便在应用中执行特定操作。这些快捷方式可在受支持的启动器或助理（如 Google 助理）中显示，方便用户快速启动应用中的常见任务或推荐任务。通过本文你还将了解一些可提升快...

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