PhotoView的简单实现

最新推荐文章于 2024-09-15 08:26:10 发布

Android_Sunshine_Sun

最新推荐文章于 2024-09-15 08:26:10 发布

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分类专栏：第三方文章标签： Android photoview

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 PhotoView 是一款扩展自 
 Android 
  ImageView，支持通过单点/多点触摸来进行图片缩放的智能控件。 

 
 特性： 

 
 支持单点/多点触摸，即时缩放图片； 

 
 支持平滑滚动； 

 
 在滑动父控件下能够运行良好；（例如：ViewPager） 

 
 当用户的触点改变是可以触发通知 

 
 和ViewPager等能完美兼容 

 
 需要在as最外面的那一层 

 
 添加权限 

 
 allprojects 
  {repositories { maven { url  
 "https://jitpack.io" 
  } }} 

 
 然后在项目下添加 

 
 dependencies 
  { compile  
 'com.github.chrisbanes:PhotoView:latest.release.here' 
 } 

 
 之后只需要在布局文件中 

 
 <com.github.chrisbanes.photoview.PhotoView 

 
 android:id="@+id/pv" 

 
 android:layout_width="wrap_content" 

 
 android:layout_height="wrap_content" /> 

 
 就可以使用了 

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专栏目录

AndroidPhotoView

06-23

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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Android_Sunshine_Sun的博客

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PhotoView 是一款扩展自Android ImageView，支持通过单点/多点触摸来进行图片缩放的智能控件。特性：支持单点/多点触摸，即时缩放图片；支持平滑滚动；在滑动父控件下能够运行良好；（例如：ViewPager）当用户的触点改变是可以触发通知和ViewPager等能完美兼容需要在as最外面的那一层添加权限 allprojects {reposit

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自定义 PhotoView 继承(extends)自 View。并在最中间显示后面操作的图片。绘制图片可以重写 onDraw()方法，并在里面通过Canvas.drawBitmap()来要绘制图片。drawBitmap()的四个参数：bitmap: 要在 Canvas 中绘制的位图letf: 正在绘制的位图左侧的位置top: 正在绘制的位图顶部的位置paint: 画笔其中 (left, top) 是要绘制图片的起始坐标。要将图片绘制在中间，我们就需要计算 left/top 的位置。

Android PhotoView基本功能实现

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268

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ViewPager+PhotoView实现...本文详细介绍了如何使用ViewPager和PhotoView实现图片查看器，提供了一个简单的示例代码，并分析了实现原理和优点。这个示例代码可以作为一个基础，帮助开发者快速实现图片查看器的功能。

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在Android应用开发中，展示图片并提供用户...`Photoview`库使得这些手势操作变得简单，而`Picasso`则帮助我们高效地加载网络图片。在实际应用中，你可能还需要考虑图片加载的优化策略，如缓存机制等，以提升用户体验。

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