去掉MainActivity的entryMap、uninstallMap，使用下载是添加packageNam来进行获取DownloadEntity

app/src/main/java/com/gh/gamecenter/adapter/ConcernAdapter.java

@@ -208,10 +208,16 @@ public class ConcernAdapter extends RecyclerView.Adapter<ConcernViewHolder> {
 	}
 
 	public List<GameEntity> getConcernGameList() {
+		if (concernGameList == null) {
+			concernGameList = new ArrayList<>();
+		}
 		return concernGameList;
 	}
 
 	public List<ConcernInfo> getConcernList() {
+		if (concernList == null) {
+			concernList = new ArrayList<>();
+		}
 		return concernList;
 	}
 }