Customizable Android full screen image viewer for Fresco library supporting "pinch to zoom" and "swipe to dismiss" gestures
Java
Latest commit 04dc9b9 Dec 27, 2016 @troy379 troy379 latest version badge

README.md

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FrescoImageViewer

Simple customizable full screen image viewer for Fresco library that includes "pinch to zoom" and "swipe to dismiss" gestures. Based on PhotoDraweeView by ongakuer.

alt tag

Requirements

  • Fresco v.0.12.0 and higher
  • SDK 14 and and higher

Download

Download via Gradle:

compile 'com.github.stfalcon:frescoimageviewer:0.4.1'

or Maven:

<dependency>
  <groupId>com.github.stfalcon</groupId>
  <artifactId>frescoimageviewer</artifactId>
  <version>0.4.1</version>
  <type>pom</type>
</dependency>

Usage

All you need to show a viewer is pass the context, start position and List or String[] into builder and call show().

new ImageViewer.Builder(context, list)
                .setStartPosition(startPosition)
                .show();

Piece of cake! 🍰 😉

Customizing

You can also customize a viewer to fit your needs.

Background

Use setBackgroundColorRes(colorRes) or setBackgroundColor(colorInt) to set color for fading background.

Custom overlay view

If you need some content over the image (e.g. sharing or download button, description, numeration etc.) you can set your custom view using setOverlayView(customView) and bind it with viewer through ImageViewer.OnImageChangeListener.

Custom drawee hierarchy

Of course, according to Fresco flexibility, you can use your custom GenericDraweeHierarchy. To do this you simply need to create GenericDraweeHierarchyBuilder and pass it into builder:

GenericDraweeHierarchyBuilder hierarchyBuilder = GenericDraweeHierarchyBuilder.newInstance(getResources())
                .setFailureImage(R.drawable.failureDrawable)
                .setProgressBarImage(R.drawable.progressBarDrawable)
                .setPlaceholderImage(R.drawable.placeholderDrawable);

        new ImageViewer.Builder(context, urls)
                ...
                .setCustomDraweeHierarchyBuilder(hierarchyBuilder)
                .show();

But there is a limitation: default ScaleType in hierarchy is ScaleType.FIT_CENTER, so custom value will be ignored

Image margin

Simply add margins between images with dimens with setImageMargin(context, dimen) or in px using setImageMarginPx(marginPx).

Status bar visibility

To show/hide status bar in view mode you can set hideStatusBar(boolean) in builder. The default value is strue.

Here is an example that sets possible options:

new ImageViewer.Builder(context, list)
                .setStartPosition(startPosition)
                //.hideStatusBar(false)
                .setBackgroundColorRes(colorRes)
                //.setBackgroundColor(color)
                .setImageMargin(R.dimen.image_margin)
                .setImageChangeListener(changeListener)
                .setOnDismissListener(dismissListener)
                .setCustomDraweeHierarchyBuilder(hierarchyBuilder)
                .setOverlayView(overlayView)
                .show();

With this possibilities you can achieve something like this:

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You can take a look at sample project for more information.

License

Copyright (C) 2016 stfalcon.com

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.