by danikula

Cache support for any video player with help of single line

4.4K Stars 954 Forks Last release: over 2 years ago (2.7.1) Apache License 2.0 89 Commits 22 Releases

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Video cache support for Android

Android Arsenal Build Status Download

Table of Content

Why AndroidVideoCache?

Because there is no sense to download video a lot of times while streaming!

allows to add caching support to your
, ExoPlayer or any another player with help of single line!


  • caching to disk during streaming;
  • offline work with cached resources;
  • partial loading;
  • cache limits (max cache size, max files count);
  • multiple clients for same url.


works only with direct urls to media file, it doesn't support any streaming technology like DASH, SmoothStreaming, HLS.

Get started

Just add dependency (

is available in jcenter):
dependencies {
    compile 'com.danikula:videocache:2.7.1'

and use url from proxy instead of original url for adding caching:

protected void onCreate(Bundle savedInstanceState) {

HttpProxyCacheServer proxy = getProxy();
String proxyUrl = proxy.getProxyUrl(VIDEO_URL);


private HttpProxyCacheServer getProxy() { // should return single instance of HttpProxyCacheServer shared for whole app. }

To guarantee normal work you should use single instance of

for whole app. For example you can store shared proxy in your
public class App extends Application {

private HttpProxyCacheServer proxy;

public static HttpProxyCacheServer getProxy(Context context) {
    App app = (App) context.getApplicationContext();
    return app.proxy == null ? (app.proxy = app.newProxy()) : app.proxy;

private HttpProxyCacheServer newProxy() {
    return new HttpProxyCacheServer(this);


or use simple factory. More preferable way is use some dependency injector like Dagger.


Disk cache limit

By default

uses 512Mb for caching files. You can change this value:
private HttpProxyCacheServer newProxy() {
    return new HttpProxyCacheServer.Builder(this)
            .maxCacheSize(1024 * 1024 * 1024)       // 1 Gb for cache

or can limit total count of files in cache:

private HttpProxyCacheServer newProxy() {
    return new HttpProxyCacheServer.Builder(this)

or even implement your own

private HttpProxyCacheServer newProxy() {
    return new HttpProxyCacheServer.Builder(this)
            .diskUsage(new MyCoolDiskUsageStrategy())

Listen caching progress


HttpProxyCacheServer.registerCacheListener(CacheListener listener)
method to set listener with callback
onCacheAvailable(File cacheFile, String url, int percentsAvailable)
to be aware of caching progress. Do not forget to to unsubscribe listener with help of
HttpProxyCacheServer.unregisterCacheListener(CacheListener listener)
method to avoid memory leaks.


HttpProxyCacheServer.isCached(String url)
method to check was url's content fully cached to file or not.


app for more details.

Providing names for cached files

By default

uses MD5 of video url as file name. But in some cases url is not stable and it can contain some generated parts (e.g. session token). In this case caching mechanism will be broken. To fix it you have to provide own
: ``` java public class MyFileNameGenerator implements FileNameGenerator {
// Urls contain mutable parts (parameter 'sessionToken') and stable video's id (parameter 'videoId').
// e. g.
public String generate(String url) {
    Uri uri = Uri.parse(url);
    String videoId = uri.getQueryParameter("videoId");
    return videoId + ".mp4";


... HttpProxyCacheServer proxy = HttpProxyCacheServer.Builder(context) .fileNameGenerator(new MyFileNameGenerator()) .build() ```

Adding custom http headers

You can add custom headers to requests with help of

: ``` java public class UserAgentHeadersInjector implements HeaderInjector {
public Map addHeaders(String url) {
    return Maps.newHashMap("User-Agent", "Cool app v1.1");


private HttpProxyCacheServer newProxy() { return new HttpProxyCacheServer.Builder(this) .headerInjector(new UserAgentHeadersInjector()) .build(); }

### Using exoPlayer
You can use [`exoPlayer`]( with `AndroidVideoCache`. See `sample` app in [`exoPlayer`]( branch. Note [exoPlayer supports]( cache as well.  


See sample app.

Known problems

  • In some cases clients can't connect to local proxy server ('Error pinging server' error). May be it is result of previous error. Note in this case video will be played, but without caching.

Whats new

See Release Notes here

Code contributions

If it's a feature that you think would need to be discussed please open an issue first, otherwise, you can follow this process:

  1. Fork the project
  2. Create a feature branch (git checkout -b my_branch)
  3. Fix a problem. Your code must contain test for reproducing problem. Your tests must be passed with help of your fix
  4. Push your changes to your new branch (git push origin my_branch)
  5. Initiate a pull request on github
  6. Rebase master branch if your local branch is not actual. Merging is not acceptable, only rebase
  7. Your pull request will be reviewed and hopefully merged :)

Where published?



[email protected]


Copyright 2014-2017 Alexey Danilov

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

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.

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