Use an intent to start exoplayer streaming

We mainly focus on four files, SampleChooserActivity, PlayerActivity, media.exolist.json, AndroidManifest.xml.

  • SampleChooserActivity is the main UI, where we choose a stream to play.
  • media.exolist.json is the file storing the stream info, uri, extension, drm_scheme etc.
  • PlayerActivity receives the data passed in and deal with them.
  • AndroidManifest.xml stores activity info.

In this case, possible stream info are: uri, extension, drm_scheme, drm_license_url, ad_tag_uri.

Step 1: We take a look at AndroidManifest.xml:

<activity android:name="com.google.android.exoplayer2.demo.PlayerActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenSize|screenLayout|smallestScreenSize|uiMode"
        android:launchMode="singleTop"
        android:label="@string/application_name"
        android:theme="@style/PlayerTheme">
      <intent-filter>
        <action android:name="com.google.android.exoplayer.demo.action.VIEW"/>
        <category android:name="android.intent.category.DEFAULT"/>
        <data android:scheme="http"/>
        <data android:scheme="https"/>
        <data android:scheme="content"/>
        <data android:scheme="asset"/>
        <data android:scheme="file"/>
      </intent-filter>
      <intent-filter>
        <action android:name="com.google.android.exoplayer.demo.action.VIEW_LIST"/>
        <category android:name="android.intent.category.DEFAULT"/>
      </intent-filter>
    </activity>

We can see the PlayerActivity receives two kinds of intent:

<intent-filter>
    <action android:name="com.google.android.exoplayer.demo.action.VIEW"/>
    <category android:name="android.intent.category.DEFAULT"/>
    ...
</intent-filter>
<intent-filter>
    <action android:name="com.google.android.exoplayer.demo.action.VIEW_LIST"/>
    <category android:name="android.intent.category.DEFAULT"/>
</intent-filter>

Step 2: Let's have a look how the info are passed to PlayerActivity.

The following code is found in this class:

public Intent buildIntent(Context context) {
  Intent intent = new Intent(context, PlayerActivity.class);
  intent.putExtra(PlayerActivity.PREFER_EXTENSION_DECODERS, preferExtensionDecoders);
  if (drmInfo != null) {
    drmInfo.updateIntent(intent);
  }

  return intent;
}

@Override
public Intent buildIntent(Context context) {
    return super.buildIntent(context)
    .setData(Uri.parse(uri))
    .putExtra(PlayerActivity.EXTENSION_EXTRA, extension)
    .putExtra(PlayerActivity.AD_TAG_URI_EXTRA, adTagUri)
    .setAction(PlayerActivity.ACTION_VIEW);
}

@Override
public Intent buildIntent(Context context) {
    String[] uris = new String[children.length];
    String[] extensions = new String[children.length];
    for (int i = 0; i < children.length; i++) {
        uris[i] = children[i].uri;
        extensions[i] = children[i].extension;
    }
    return super.buildIntent(context)
    .putExtra(PlayerActivity.URI_LIST_EXTRA, uris)
    .putExtra(PlayerActivity.EXTENSION_LIST_EXTRA, extensions)
    .setAction(PlayerActivity.ACTION_VIEW_LIST);
}

public void updateIntent(Intent intent) {
    Assertions.checkNotNull(intent);
    intent.putExtra(PlayerActivity.DRM_SCHEME_UUID_EXTRA, drmSchemeUuid.toString());
    intent.putExtra(PlayerActivity.DRM_LICENSE_URL, drmLicenseUrl);
    intent.putExtra(PlayerActivity.DRM_KEY_REQUEST_PROPERTIES, drmKeyRequestProperties);
    intent.putExtra(PlayerActivity.DRM_MULTI_SESSION, drmMultiSession);
}

private UUID getDrmUuid(String typeString) throws ParserException {
    switch (Util.toLowerInvariant(typeString)) {
    case "widevine":
        return C.WIDEVINE_UUID;
    case "playready":
        return C.PLAYREADY_UUID;
    case "clearkey":
        return C.CLEARKEY_UUID;
    default:
        try {
            return UUID.fromString(typeString);
         catch (RuntimeException e) {
            throw new ParserException("Unsupported drm type: " + typeString);
        }
    }
}

This means if the steam we choose contains one single uri, we can pass an intent this way:


        Context context = InstrumentationRegistry.getTargetContext();
        String uri;
        String extension;
        String drm_scheme_uuid;
        String drm_license_url;
        String ad_tag_uri;
        
        Intent intent = new Intent(context, PlayerActivity.class);
        intent.setAction(PlayerActivity.ACTION_VIEW);
        intent.addCategory("android.intent.category.DEFAULT");
        intent.setData(Uri.parse(uri));
        intent.putExtra(PlayerActivity.EXTENSION_EXTRA, extension);
        intent.putExtra(PlayerActivity.DRM_SCHEME_UUID_EXTRA, drm_scheme_uuid);
        intent.putExtra(PlayerActivity.DRM_LICENSE_URL, drm_license_url);
        intent.putExtra(PlayerActivity.AD_TAG_URI_EXTRA, ad_tag_uri)

Or if the stream we choose contains multiple uris, we can pass an intent this way:

        Context context = InstrumentationRegistry.getTargetContext();
        String uri;
        String extension;
        String drm_scheme_uuid;
        String drm_license_url;
        String ad_tag_uri;

        Intent intent = new Intent(context, PlayerActivity.class);
        intent.setAction(PlayerActivity.ACTION_VIEW_LIST);
        intent.addCategory("android.intent.category.DEFAULT");
        intent.putExtra(PlayerActivity.URI_LIST_EXTRA, uris);
        intent.putExtra(PlayerActivity.EXTENSION_EXTRA, extension);
        intent.putExtra(PlayerActivity.DRM_SCHEME_UUID_EXTRA, drm_scheme_uuid);
        intent.putExtra(PlayerActivity.DRM_LICENSE_URL, drm_license_url);
        intent.putExtra(PlayerActivity.AD_TAG_URI_EXTRA, ad_tag_uri)

Step 3: Let's have a look at how to info are received by PlayerActivity:

UUID drmSchemeUuid = intent.hasExtra(DRM_SCHEME_UUID_EXTRA)
? UUID.fromString(intent.getStringExtra(DRM_SCHEME_UUID_EXTRA)) : null;

Intent intent = getIntent();
String action = intent.getAction();

if (ACTION_VIEW.equals(action)) {
      uris = new Uri[]{intent.getData()};
      extensions = new String[]{intent.getStringExtra(EXTENSION_EXTRA)};
    } else if (ACTION_VIEW_LIST.equals(action)) {
      String[] uriStrings = intent.getStringArrayExtra(URI_LIST_EXTRA);
      uris = new Uri[uriStrings.length];
      for (int i = 0; i < uriStrings.length; i++) {
        uris[i] = Uri.parse(uriStrings[i]);
      }
      extensions = intent.getStringArrayExtra(EXTENSION_LIST_EXTRA);
      if (extensions == null) {
        extensions = new String[uriStrings.length];
      }
    } else {
      showToast(getString(R.string.unexpected_intent_action, action));
      return;
    }

UUID drmSchemeUuid = intent.hasExtra(DRM_SCHEME_UUID_EXTRA)?UUID.fromString(intent.getStringExtra(DRM_SCHEME_UUID_EXTRA)) : null;
uris = new Uri[]{intent.getData()
String[] uriStrings = intent.getStringArrayExtra(URI_LIST_EXTRA);
extensions = new String[]{intent.getStringExtra(EXTENSION_EXTRA)};
String drmLicenseUrl = intent.getStringExtra(DRM_LICENSE_URL);
String adTagUriString = intent.getStringExtra(AD_TAG_URI_EXTRA);
In general, intent extras are passed as key value pair: a value for a key, except when we wish to pass a uri, we use Intent.setData(Uri uri).

Additional info, the json file looks like this:

"name": "WV: HDCP not specified",
        "uri": "https://storage.googleapis.com/wvmedia/cenc/h264/tears/tears.mpd",
        "drm_scheme": "widevine",
        "drm_license_url": "https://proxy.uat.widevine.com/proxy?video_id=d286538032258a1c&provider=widevine_test"

{
        "name": "Google Play (WebM,VP9)",
        "uri": "http://www.youtube.com/api/manifest/dash/id/3aa39fa2cc27967f/source/youtube?as=fmp4_audio_clear,webm2_sd_hd_clear&sparams=ip,ipbits,expire,source,id,as&ip=0.0.0.0&ipbits=0&expire=19000000000&signature=B1C2A74783AC1CC4865EB312D7DD2D48230CC9FD.BD153B9882175F1F94BFE5141A5482313EA38E8D&key=ik0",
        "extension": "mpd"
      }

or

 {
        "name": "Clear -> Enc -> Clear -> Enc -> Enc",
        "drm_scheme": "widevine",
        "drm_license_url": "https://proxy.uat.widevine.com/proxy?provider=widevine_test",
        "playlist": [
          {
            "uri": "https://html5demos.com/assets/dizzy.mp4"
          },
          {
            "uri": "https://storage.googleapis.com/wvmedia/cenc/h264/tears/tears_sd.mpd"
          },
          {
            "uri": "https://html5demos.com/assets/dizzy.mp4"
          },
          {
            "uri": "https://storage.googleapis.com/wvmedia/cenc/h264/tears/tears_sd.mpd"
          },
          {
            "uri": "https://storage.googleapis.com/wvmedia/cenc/h264/tears/tears_sd.mpd"
          }
        ]
      }

Of course, the last one needs to be passed in as

Intent.setAction(PlayerActivity.ACTION_VIEW_LIST);
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