[leanback] optimize live ux

app/src/leanback/java/com/fongmi/android/tv/ui/activity/LiveActivity.java

@@ -694,7 +694,7 @@ public class LiveActivity extends BaseActivity implements GroupPresenter.OnClick
     }
 
     private void checkNext() {
-        if (mChannel.isOnly()) {
+        if (mChannel.isLast()) {
             if (isGone(mBinding.recycler)) onKeyDown();
         } else {
             nextLine(true);

app/src/main/java/com/fongmi/android/tv/bean/Channel.java

@@ -179,6 +179,10 @@ public class Channel {
         return getUrls().size() == 1;
     }
 
+    public boolean isLast() {
+        return getLine() == getUrls().size() - 1;
+    }
+
     public String getLineText() {
         if (getUrls().size() <= 1) return "";
         if (getCurrent().contains("$")) return getCurrent().split("\\$")[1];