Demo app: Remove is_live from exolist.json

It's not used in the public exolist.json file. It's only use is to
disable the download icon for live content, but it's quite easy to
forget (there are live samples in our internal exolist.json files
that omit this property!).

It's better just to show a clear error message toast when the
download actually fails for this reason.

PiperOrigin-RevId: 326281649

demos/main/src/main/java/com/google/android/exoplayer2/demo/DownloadTracker.java

@@ -35,6 +35,7 @@ import com.google.android.exoplayer2.drm.OfflineLicenseHelper;
 import com.google.android.exoplayer2.offline.Download;
 import com.google.android.exoplayer2.offline.DownloadCursor;
 import com.google.android.exoplayer2.offline.DownloadHelper;
+import com.google.android.exoplayer2.offline.DownloadHelper.LiveContentUnsupportedException;
 import com.google.android.exoplayer2.offline.DownloadIndex;
 import com.google.android.exoplayer2.offline.DownloadManager;
 import com.google.android.exoplayer2.offline.DownloadRequest;
@@ -248,13 +249,13 @@ public class DownloadTracker {
 
     @Override
     public void onPrepareError(@NonNull DownloadHelper helper, @NonNull IOException e) {
-      Toast.makeText(context, R.string.download_start_error, Toast.LENGTH_LONG).show();
-      Log.e(
-          TAG,
-          e instanceof DownloadHelper.LiveContentUnsupportedException
-              ? "Downloading live content unsupported"
-              : "Failed to start download",
-          e);
+      boolean isLiveContent = e instanceof LiveContentUnsupportedException;
+      int toastStringId =
+          isLiveContent ? R.string.download_live_unsupported : R.string.download_start_error;
+      String logMessage =
+          isLiveContent ? "Downloading live content unsupported" : "Failed to start download";
+      Toast.makeText(context, toastStringId, Toast.LENGTH_LONG).show();
+      Log.e(TAG, logMessage, e);
     }
 
     // DialogInterface.OnClickListener implementation.

demos/main/src/main/java/com/google/android/exoplayer2/demo/IntentUtil.java

@@ -35,18 +35,6 @@ import java.util.Map;
 /** Util to read from and populate an intent. */
 public class IntentUtil {
 
-  /** A tag to hold custom playback configuration attributes. */
-  public static class Tag {
-
-    /** Whether the stream is a live stream. */
-    public final boolean isLive;
-
-    /** Creates an instance. */
-    public Tag(boolean isLive) {
-      this.isLive = isLive;
-    }
-  }
-
   // Actions.
 
   public static final String ACTION_VIEW = "com.google.android.exoplayer.demo.action.VIEW";

demos/main/src/main/java/com/google/android/exoplayer2/demo/SampleChooserActivity.java

@@ -253,9 +253,6 @@ public class SampleChooserActivity extends AppCompatActivity
     }
     MediaItem.PlaybackProperties playbackProperties =
         checkNotNull(playlistHolder.mediaItems.get(0).playbackProperties);
-    if (((IntentUtil.Tag) checkNotNull(playbackProperties.tag)).isLive) {
-      return R.string.download_live_unsupported;
-    }
     if (playbackProperties.adTagUri != null) {
       return R.string.download_ads_unsupported;
     }
@@ -347,7 +344,6 @@ public class SampleChooserActivity extends AppCompatActivity
       Uri uri = null;
       String extension = null;
       String title = null;
-      boolean isLive = false;
       ArrayList<PlaylistHolder> children = null;
       Uri subtitleUri = null;
       String subtitleMimeType = null;
@@ -376,9 +372,6 @@ public class SampleChooserActivity extends AppCompatActivity
           case "ad_tag_uri":
             mediaItem.setAdTagUri(reader.nextString());
             break;
-          case "is_live":
-            isLive = reader.nextBoolean();
-            break;
           case "drm_scheme":
             mediaItem.setDrmUuid(Util.getDrmUuid(reader.nextString()));
             break;
@@ -443,8 +436,7 @@ public class SampleChooserActivity extends AppCompatActivity
         mediaItem
             .setUri(uri)
             .setMediaMetadata(new MediaMetadata.Builder().setTitle(title).build())
-            .setMimeType(adaptiveMimeType)
-            .setTag(new IntentUtil.Tag(isLive));
+            .setMimeType(adaptiveMimeType);
         if (subtitleUri != null) {
           MediaItem.Subtitle subtitle =
               new MediaItem.Subtitle(