PhotoView-Android 使用指南

PhotoView-Android 使用指南

项目地址:https://gitcode.com/gh_mirrors/ph/photoview-android

PhotoView 是一个专为 Android 平台设计的 ImageView 组件,它提供丰富的触控手势来实现图片的缩放功能。本指南旨在帮助开发者理解和应用此开源项目,主要围绕其目录结构、启动文件以及配置需求展开。

1. 项目目录结构及介绍

PhotoView-Android 的项目结构清晰,便于开发者快速定位所需资源。以下是一些关键目录的简要说明:

  • photoview: 主要代码存放区,包含了PhotoView的核心逻辑。
  • samples: 示例应用目录,提供了如何在实际应用中集成PhotoView的各种示例。
  • spotless: 代码风格检查相关的配置,用于保持代码整洁一致。
  • gradle.properties, build.gradle, settings.gradle.kts: 构建系统相关文件,定义了项目构建的规则和依赖管理。
  • LICENSE: 许可证文件,说明了软件使用的Apache 2.0许可证条款。
  • README.md: 项目简介和基本使用说明。
  • CODE_OF_CONDUCT.md: 项目贡献者的行为准则。

2. 项目的启动文件介绍

项目启动并非传统意义上的“启动文件”,但若考虑集成至自己的应用程序,关键在于引入依赖并初始化使用。主要通过两个步骤完成“启动”:

引入依赖

在你的应用级 build.gradle 文件中添加以下依赖:

dependencies {
    implementation("io.getstream:photoview:1.0.2")
}

初始化使用

在XML布局文件中直接使用 <io.getstream.photoview.PhotoView> 替换普通的ImageView即可启动使用。例如:

<io.getstream.photoview.PhotoView
    android:id="@+id/photoView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:src="@drawable/wallpaper"/>

对于动态加载图片,如使用Glide或Coil,则需在Java或Kotlin代码中进行相应加载操作。

3. 项目的配置文件介绍

build.gradle 文件

项目的主要配置位于 build.gradle 文件中,这里定义了项目的依赖、编译参数等。例如,添加依赖是在 dependencies 块完成的,它确保了项目能够正确地拉取所需的第三方库。

gradle.properties

包含了一些全局的Gradle属性设置,比如版本号、兼容性设置等,这些配置间接影响项目的构建环境。

settings.gradle(.kts)

定义了项目的包含关系,指定了哪些子项目会被构建系统识别并加入到项目中。对于复杂的项目,可能会在这里指定远程仓库或子模块的导入路径。

综上所述,PhotoView-Android 的配置和使用相对直观,重点在于理解其如何被集成进现有应用之中,并利用提供的API满足图片展示与交互的需求。通过遵循上述指导,开发者可以轻松地在应用中实现图片的触摸缩放功能。

photoview-android 🌇 PhotoView is an ImageView component that enables zoom functionality through diverse touch gestures for Android. photoview-android 项目地址: https://gitcode.com/gh_mirrors/ph/photoview-android

创作声明:本文部分内容由AI辅助生成(AIGC),仅供参考

PhotoView PhotoView aims to help produce an easily usable implementation of a zooming Android ImageView. Branch Develop: Build Status Branch Master: Build Status PhotoView Features Out of the box zooming, using multi-touch and double-tap. Scrolling, with smooth scrolling fling. Works perfectly when used in a scrolling parent (such as ViewPager). Allows the application to be notified when the displayed Matrix has changed. Useful for when you need to update your UI based on the current zoom/scroll position. Allows the application to be notified when the user taps on the Photo. Sample Application The sample application (the source is in the repository) has been published onto Google Play for easy access: Get it on Google Play Gradle Dependency Add this in your root build.gradle file (not your module build.gradle file): allprojects { repositories { ... maven { url "https://jitpack.io" } } } Then, add the library to your project build.gradle dependencies { compile 'com.github.chrisbanes:PhotoView:1.2.6' } Sample Usage There is a sample provided which shows how to use the library in a more advanced way, but for completeness here is all that is required to get PhotoView working: ImageView mImageView; PhotoViewAttacher mAttacher; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Any implementation of ImageView can be used! mImageView = (ImageView) findViewById(R.id.iv_photo); // Set the Drawable displayed Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper); mImageView.setImageDrawable(bitmap); // Attach a PhotoViewAttacher, which takes care of all of the zooming functionality. // (not needed unless you are going to change the drawable later) mAttacher = new PhotoViewAttacher(mImageView); } // If you later call mImageView.setImageDrawable/setImageBitmap/setImageResource/etc then you just need to call mAttacher.update(); Issues With ViewGroups There are some ViewGroups (ones that utilize onInterceptTouchEvent) that throw exceptions when a PhotoView is placed within them, most notably ViewPager and DrawerLayout. This is a framework issue that has not been resolved. In order to prevent this exception (which typically occurs when you zoom out), take a look at HackyDrawerLayout and you can see the solution is to simply catch the exception. Any ViewGroup which uses onInterceptTouchEvent will also need to be extended and exceptions caught. Use the HackyDrawerLayout as a template of how to do so. The basic implementation is: public class HackyProblematicViewGroup extends ProblematicViewGroup { public HackyProblematicViewGroup(Context context) { super(context); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { try { return super.onInterceptTouchEvent(ev); } catch (IllegalArgumentException e) { //uncomment if you really want to see these errors //e.printStackTrace(); return false; } } } Usage with Fresco Due to the complex nature of Fresco, this library does not currently support Fresco. See this project as an alternative solution. Subsampling Support This library aims to keep the zooming implementation simple. If you are looking for an implementation that supports subsampling, check out this project Pull Requests / Contribution Development happens in develop branch of this repository, and Pull Requests should be filled against that branch. Any Pull Request against master will be rejected License Copyright 2011, 2012 Chris Banes Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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