I'm creating an rss aggregator for my Android phone. I'd like to be able to subscribe to an rss feed from the browser since most websites have a subscribe via rss button.
How can I build an intent filter to receive those links?
This question was similar and showed how to create an intent filter to handle browser links: Make a link in the Android browser start up my app?
However, I don't know how to make it specific to rss feeds. As an attempt I tried this filter:
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<data android:mimeType="application/rss+xml" /&开发者_高级运维gt;
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
</intent-filter>
Am I on the right track? What should I be filtering on?
These 3 filters seem to be the ones used by GoogleListen and GoogleReader apps:
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
<data android:scheme="http"/>
<data android:host="*"/>
<data android:pathPattern=".*\\.xml"/>
<data android:pathPattern=".*\\.rss"/>
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
<data android:scheme="http"/>
<data android:host="feeds.feedburner.com"/>
<data android:host="feedproxy.google.com"/>
<data android:host="feeds2.feedburner.com"/>
<data android:host="feedsproxy.google.com"/>
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
<data android:scheme="http"/>
<data android:mimeType="text/xml"/>
<data android:mimeType="application/rss+xml"/>
<data android:mimeType="application/atom+xml"/>
<data android:mimeType="application/xml"/>
</intent-filter>
Turns out there's a lot of different ways podcasts can be set up so each intent filter will only work for some of them. A lot of different filters need to be used to get the desired effect over most subscribe links.
Here's some of the filters I found that worked:
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="itpc" />
<data android:scheme="pcast" />
<data android:scheme="feed" />
<data android:scheme="rss" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*xml" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*rss" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*feed.*" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*podcast.*" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*Podcast.*" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*rss.*" />
<data android:scheme="http" android:host="*"
android:pathPattern=".*RSS.*" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:mimeType="text/xml" android:scheme="http" />
<data android:mimeType="application/rss+xml" android:scheme="http" />
<data android:mimeType="application/atom+xml" android:scheme="http" />
</intent-filter>
Am I on the right track?
Yes. However:
- You don't need the scheme
- You are missing the
android:
prefix in front ofscheme
, anyway type
should beandroid:mimeType
Here is a sample application that demonstrates, among other things, responding to links on PDF files.
Could it be that the server doesn't send the right mimetype?
Experiment by adding:
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="http" />
<data android:host="*" />
<data android:pathPattern=".*\\.rss" />
<data android:pathPattern=".*\\.xml" />
</intent-filter>
Edit:
It's a bit tricky to compose the right set of intent-filters, there's a lot of early returns in the matching algorithm:
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/content/IntentFilter.java
In your case, the mimetype must match exactly which is 'application/rss+xml' do your sources return that mimetype in the message header?
URL url = new URL("http://www.engadget.com/rss.xml");
URLConnection conn = url.openConnection();
System.out.println("Content-Type:"+conn.getHeaderField("Content-Type"));
Try to:
- Make broader filters
- Add multiple filters.
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